/* $OpenBSD: window-copy.c,v 1.393 2026/04/02 08:37:14 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <ctype.h>
#include <regex.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "tmux.h"

struct window_copy_mode_data;

static const char *window_copy_key_table(struct window_mode_entry *);
static void     window_copy_command(struct window_mode_entry *, struct client *,
                    struct session *, struct winlink *, struct args *,
                    struct mouse_event *);
static struct screen *window_copy_init(struct window_mode_entry *,
                    struct cmd_find_state *, struct args *);
static struct screen *window_copy_view_init(struct window_mode_entry *,
                    struct cmd_find_state *, struct args *);
static void     window_copy_free(struct window_mode_entry *);
static void     window_copy_resize(struct window_mode_entry *, u_int, u_int);
static void     window_copy_formats(struct window_mode_entry *,
                    struct format_tree *);
static struct screen *window_copy_get_screen(struct window_mode_entry *);
static void     window_copy_scroll1(struct window_mode_entry *,
                    struct window_pane *wp, int, u_int, int);
static void     window_copy_pageup1(struct window_mode_entry *, int);
static int      window_copy_pagedown1(struct window_mode_entry *, int, int);
static void     window_copy_next_paragraph(struct window_mode_entry *);
static void     window_copy_previous_paragraph(struct window_mode_entry *);
static void     window_copy_redraw_selection(struct window_mode_entry *, u_int);
static void     window_copy_redraw_lines(struct window_mode_entry *, u_int,
                    u_int);
static void     window_copy_redraw_screen(struct window_mode_entry *);
static void     window_copy_style_changed(struct window_mode_entry *);
static void     window_copy_write_line(struct window_mode_entry *,
                    struct screen_write_ctx *, u_int);
static void     window_copy_write_lines(struct window_mode_entry *,
                    struct screen_write_ctx *, u_int, u_int);
static char    *window_copy_match_at_cursor(struct window_copy_mode_data *);
static void     window_copy_scroll_to(struct window_mode_entry *, u_int, u_int,
                    int);
static int      window_copy_search_compare(struct grid *, u_int, u_int,
                    struct grid *, u_int, int);
static int      window_copy_search_lr(struct grid *, struct grid *, u_int *,
                    u_int, u_int, u_int, int);
static int      window_copy_search_rl(struct grid *, struct grid *, u_int *,
                    u_int, u_int, u_int, int);
static int      window_copy_last_regex(struct grid *, u_int, u_int, u_int,
                    u_int, u_int *, u_int *, const char *, const regex_t *,
                    int);
static int      window_copy_search_mark_at(struct window_copy_mode_data *,
                    u_int, u_int, u_int *);
static char    *window_copy_stringify(struct grid *, u_int, u_int, u_int,
                    char *, u_int *);
static void     window_copy_cstrtocellpos(struct grid *, u_int, u_int *,
                    u_int *, const char *);
static int      window_copy_search_marks(struct window_mode_entry *,
                    struct screen *, int, int);
static void     window_copy_clear_marks(struct window_mode_entry *);
static int      window_copy_is_lowercase(const char *);
static void     window_copy_search_back_overlap(struct grid *, regex_t *,
                    u_int *, u_int *, u_int *, u_int);
static int      window_copy_search_jump(struct window_mode_entry *,
                    struct grid *, struct grid *, u_int, u_int, u_int, int, int,
                    int, int);
static int      window_copy_search(struct window_mode_entry *, int, int);
static int      window_copy_search_up(struct window_mode_entry *, int);
static int      window_copy_search_down(struct window_mode_entry *, int);
static void     window_copy_goto_line(struct window_mode_entry *, const char *);
static void     window_copy_update_cursor(struct window_mode_entry *, u_int,
                    u_int);
static void     window_copy_start_selection(struct window_mode_entry *);
static int      window_copy_adjust_selection(struct window_mode_entry *,
                    u_int *, u_int *);
static int      window_copy_set_selection(struct window_mode_entry *, int, int);
static int      window_copy_update_selection(struct window_mode_entry *, int,
                    int);
static void     window_copy_synchronize_cursor(struct window_mode_entry *, int);
static void    *window_copy_get_selection(struct window_mode_entry *, size_t *);
static void     window_copy_copy_buffer(struct window_mode_entry *,
                    const char *, void *, size_t, int, int);
static void     window_copy_pipe(struct window_mode_entry *,
                    struct session *, const char *);
static void     window_copy_copy_pipe(struct window_mode_entry *,
                    struct session *, const char *, const char *,
                    int, int);
static void     window_copy_copy_selection(struct window_mode_entry *,
                    const char *, int, int);
static void     window_copy_append_selection(struct window_mode_entry *);
static void     window_copy_clear_selection(struct window_mode_entry *);
static void     window_copy_copy_line(struct window_mode_entry *, char **,
                    size_t *, u_int, u_int, u_int);
static int      window_copy_in_set(struct window_mode_entry *, u_int, u_int,
                    const char *);
static u_int    window_copy_find_length(struct window_mode_entry *, u_int);
static void     window_copy_cursor_start_of_line(struct window_mode_entry *);
static void     window_copy_cursor_back_to_indentation(
                    struct window_mode_entry *);
static void     window_copy_cursor_end_of_line(struct window_mode_entry *);
static void     window_copy_other_end(struct window_mode_entry *);
static void     window_copy_cursor_left(struct window_mode_entry *);
static void     window_copy_cursor_right(struct window_mode_entry *, int);
static void     window_copy_cursor_up(struct window_mode_entry *, int);
static void     window_copy_cursor_down(struct window_mode_entry *, int);
static void     window_copy_cursor_jump(struct window_mode_entry *);
static void     window_copy_cursor_jump_back(struct window_mode_entry *);
static void     window_copy_cursor_jump_to(struct window_mode_entry *);
static void     window_copy_cursor_jump_to_back(struct window_mode_entry *);
static void     window_copy_cursor_next_word(struct window_mode_entry *,
                    const char *);
static void     window_copy_cursor_next_word_end_pos(struct window_mode_entry *,
                    const char *, u_int *, u_int *);
static void     window_copy_cursor_next_word_end(struct window_mode_entry *,
                    const char *, int);
static void     window_copy_cursor_previous_word_pos(struct window_mode_entry *,
                    const char *, u_int *, u_int *);
static void     window_copy_cursor_previous_word(struct window_mode_entry *,
                    const char *, int);
static void     window_copy_cursor_prompt(struct window_mode_entry *, int,
                    int);
static void     window_copy_scroll_up(struct window_mode_entry *, u_int);
static void     window_copy_scroll_down(struct window_mode_entry *, u_int);
static void     window_copy_rectangle_set(struct window_mode_entry *, int);
static void     window_copy_move_mouse(struct mouse_event *);
static void     window_copy_drag_update(struct client *, struct mouse_event *);
static void     window_copy_drag_release(struct client *, struct mouse_event *);
static void     window_copy_jump_to_mark(struct window_mode_entry *);
static void     window_copy_acquire_cursor_up(struct window_mode_entry *,
                    u_int, u_int, u_int, u_int, u_int);
static void     window_copy_acquire_cursor_down(struct window_mode_entry *,
                    u_int, u_int, u_int, u_int, u_int, u_int, int);
static u_int    window_copy_clip_width(u_int, u_int, u_int, u_int);
static u_int    window_copy_search_mark_match(struct window_copy_mode_data *,
                    u_int , u_int, u_int, int);

const struct window_mode window_copy_mode = {
        .name = "copy-mode",

        .init = window_copy_init,
        .free = window_copy_free,
        .resize = window_copy_resize,
        .style_changed = window_copy_style_changed,
        .key_table = window_copy_key_table,
        .command = window_copy_command,
        .formats = window_copy_formats,
        .get_screen = window_copy_get_screen
};

const struct window_mode window_view_mode = {
        .name = "view-mode",

        .init = window_copy_view_init,
        .free = window_copy_free,
        .resize = window_copy_resize,
        .style_changed = window_copy_style_changed,
        .key_table = window_copy_key_table,
        .command = window_copy_command,
        .formats = window_copy_formats,
        .get_screen = window_copy_get_screen
};

enum {
        WINDOW_COPY_OFF,
        WINDOW_COPY_SEARCHUP,
        WINDOW_COPY_SEARCHDOWN,
        WINDOW_COPY_JUMPFORWARD,
        WINDOW_COPY_JUMPBACKWARD,
        WINDOW_COPY_JUMPTOFORWARD,
        WINDOW_COPY_JUMPTOBACKWARD,
};

enum {
        WINDOW_COPY_REL_POS_ABOVE,
        WINDOW_COPY_REL_POS_ON_SCREEN,
        WINDOW_COPY_REL_POS_BELOW,
};

enum window_copy_cmd_action {
        WINDOW_COPY_CMD_NOTHING,
        WINDOW_COPY_CMD_REDRAW,
        WINDOW_COPY_CMD_CANCEL,
};

enum window_copy_cmd_clear {
        WINDOW_COPY_CMD_CLEAR_ALWAYS,
        WINDOW_COPY_CMD_CLEAR_NEVER,
        WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
};

struct window_copy_cmd_state {
        struct window_mode_entry        *wme;
        struct args                     *args;
        struct args                     *wargs;
        struct mouse_event              *m;

        struct client                   *c;
        struct session                  *s;
        struct winlink                  *wl;
};

/*
 * Copy mode's visible screen (the "screen" field) is filled from one of two
 * sources: the original contents of the pane (used when we actually enter via
 * the "copy-mode" command, to copy the contents of the current pane), or else
 * a series of lines containing the output from an output-writing tmux command
 * (such as any of the "show-*" or "list-*" commands).
 *
 * In either case, the full content of the copy-mode grid is pointed at by the
 * "backing" field, and is copied into "screen" as needed (that is, when
 * scrolling occurs). When copy-mode is backed by a pane, backing points
 * directly at that pane's screen structure (&wp->base); when backed by a list
 * of output-lines from a command, it points at a newly-allocated screen
 * structure (which is deallocated when the mode ends).
 */
struct window_copy_mode_data {
        struct screen    screen;

        struct screen   *backing;
        int              backing_written; /* backing display started */
        struct input_ctx *ictx;

        int              viewmode;      /* view mode entered */

        u_int            oy;            /* number of lines scrolled up */

        u_int            selx;          /* beginning of selection */
        u_int            sely;

        u_int            endselx;       /* end of selection */
        u_int            endsely;

        enum {
                CURSORDRAG_NONE,        /* selection is independent of cursor */
                CURSORDRAG_ENDSEL,      /* end is synchronized with cursor */
                CURSORDRAG_SEL,         /* start is synchronized with cursor */
        } cursordrag;

        int              modekeys;
        enum {
                LINE_SEL_NONE,
                LINE_SEL_LEFT_RIGHT,
                LINE_SEL_RIGHT_LEFT,
        } lineflag;                     /* line selection mode */
        int              rectflag;      /* in rectangle copy mode? */
        int              scroll_exit;   /* exit on scroll to end? */
        int              hide_position; /* hide position marker */

        enum {
                SEL_CHAR,               /* select one char at a time */
                SEL_WORD,               /* select one word at a time */
                SEL_LINE,               /* select one line at a time */
        } selflag;

        const char      *separators;    /* word separators */

        u_int            dx;            /* drag start position */
        u_int            dy;

        u_int            selrx;         /* selection reset positions */
        u_int            selry;
        u_int            endselrx;
        u_int            endselry;

        u_int            cx;
        u_int            cy;

        u_int            lastcx;        /* position in last line w/ content */
        u_int            lastsx;        /* size of last line w/ content */

        u_int            mx;            /* mark position */
        u_int            my;
        int              showmark;

        int              searchtype;
        int              searchdirection;
        int              searchregex;
        char            *searchstr;
        u_char          *searchmark;
        int              searchcount;
        int              searchmore;
        int              searchall;
        int              searchx;
        int              searchy;
        int              searcho;
        u_char           searchgen;

        int              timeout;       /* search has timed out */
#define WINDOW_COPY_SEARCH_TIMEOUT 10000
#define WINDOW_COPY_SEARCH_ALL_TIMEOUT 200
#define WINDOW_COPY_SEARCH_MAX_LINE 2000

        int                      jumptype;
        struct utf8_data        *jumpchar;

        struct event     dragtimer;
#define WINDOW_COPY_DRAG_REPEAT_TIME 50000
};

static void
window_copy_scroll_timer(__unused int fd, __unused short events, void *arg)
{
        struct window_mode_entry        *wme = arg;
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct timeval                   tv = {
                .tv_usec = WINDOW_COPY_DRAG_REPEAT_TIME
        };

        evtimer_del(&data->dragtimer);

        if (TAILQ_FIRST(&wp->modes) != wme)
                return;

        if (data->cy == 0) {
                evtimer_add(&data->dragtimer, &tv);
                window_copy_cursor_up(wme, 1);
        } else if (data->cy == screen_size_y(&data->screen) - 1) {
                evtimer_add(&data->dragtimer, &tv);
                window_copy_cursor_down(wme, 1);
        }
}

static struct screen *
window_copy_clone_screen(struct screen *src, struct screen *hint, u_int *cx,
    u_int *cy, int trim)
{
        struct screen           *dst;
        const struct grid_line  *gl;
        u_int                    sy, wx, wy;
        int                      reflow;

        dst = xcalloc(1, sizeof *dst);

        sy = screen_hsize(src) + screen_size_y(src);
        if (trim) {
                while (sy > screen_hsize(src)) {
                        gl = grid_peek_line(src->grid, sy - 1);
                        if (gl == NULL || gl->cellused != 0)
                                break;
                        sy--;
                }
        }
        log_debug("%s: target screen is %ux%u, source %ux%u", __func__,
            screen_size_x(src), sy, screen_size_x(hint),
            screen_hsize(src) + screen_size_y(src));
        screen_init(dst, screen_size_x(src), sy, screen_hlimit(src));

        /*
         * Ensure history is on for the backing grid so lines are not deleted
         * during resizing.
         */
        dst->grid->flags |= GRID_HISTORY;
        grid_duplicate_lines(dst->grid, 0, src->grid, 0, sy);

        dst->grid->sy = sy - screen_hsize(src);
        dst->grid->hsize = screen_hsize(src);
        dst->grid->hscrolled = src->grid->hscrolled;
        if (src->cy > dst->grid->sy - 1) {
                dst->cx = 0;
                dst->cy = dst->grid->sy - 1;
        } else {
                dst->cx = src->cx;
                dst->cy = src->cy;
        }

        if (cx != NULL && cy != NULL) {
                *cx = dst->cx;
                *cy = screen_hsize(dst) + dst->cy;
                reflow = (screen_size_x(hint) != screen_size_x(dst));
        }
        else
                reflow = 0;
        if (reflow)
                grid_wrap_position(dst->grid, *cx, *cy, &wx, &wy);
        screen_resize_cursor(dst, screen_size_x(hint), screen_size_y(hint), 1,
            0, 0);
        if (reflow)
                grid_unwrap_position(dst->grid, cx, cy, wx, wy);

        return (dst);
}

static struct window_copy_mode_data *
window_copy_common_init(struct window_mode_entry *wme)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data;
        struct screen                   *base = &wp->base;

        wme->data = data = xcalloc(1, sizeof *data);

        data->cursordrag = CURSORDRAG_NONE;
        data->lineflag = LINE_SEL_NONE;
        data->selflag = SEL_CHAR;

        if (wp->searchstr != NULL) {
                data->searchtype = WINDOW_COPY_SEARCHUP;
                data->searchregex = wp->searchregex;
                data->searchstr = xstrdup(wp->searchstr);
        } else {
                data->searchtype = WINDOW_COPY_OFF;
                data->searchregex = 0;
                data->searchstr = NULL;
        }
        data->searchx = data->searchy = data->searcho = -1;
        data->searchall = 1;

        data->jumptype = WINDOW_COPY_OFF;
        data->jumpchar = NULL;

        screen_init(&data->screen, screen_size_x(base), screen_size_y(base), 0);
        screen_set_default_cursor(&data->screen, global_w_options);
        data->modekeys = options_get_number(wp->window->options, "mode-keys");

        evtimer_set(&data->dragtimer, window_copy_scroll_timer, wme);

        return (data);
}

static struct screen *
window_copy_init(struct window_mode_entry *wme,
    __unused struct cmd_find_state *fs, struct args *args)
{
        struct window_pane              *wp = wme->swp;
        struct window_copy_mode_data    *data;
        struct screen                   *base = &wp->base;
        struct screen_write_ctx          ctx;
        u_int                            i, cx, cy;

        data = window_copy_common_init(wme);
        data->backing = window_copy_clone_screen(base, &data->screen, &cx, &cy,
            wme->swp != wme->wp);

        data->cx = cx;
        if (cy < screen_hsize(data->backing)) {
                data->cy = 0;
                data->oy = screen_hsize(data->backing) - cy;
        } else {
                data->cy = cy - screen_hsize(data->backing);
                data->oy = 0;
        }

        data->scroll_exit = args_has(args, 'e');
        data->hide_position = args_has(args, 'H');

        if (base->hyperlinks != NULL)
                data->screen.hyperlinks = hyperlinks_copy(base->hyperlinks);
        data->screen.cx = data->cx;
        data->screen.cy = data->cy;
        data->mx = data->cx;
        data->my = screen_hsize(data->backing) + data->cy - data->oy;
        data->showmark = 0;

        screen_write_start(&ctx, &data->screen);
        for (i = 0; i < screen_size_y(&data->screen); i++)
                window_copy_write_line(wme, &ctx, i);
        screen_write_cursormove(&ctx, data->cx, data->cy, 0);
        screen_write_stop(&ctx);

        return (&data->screen);
}

static struct screen *
window_copy_view_init(struct window_mode_entry *wme,
    __unused struct cmd_find_state *fs, __unused struct args *args)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data;
        struct screen                   *base = &wp->base;
        u_int                            sx = screen_size_x(base);

        data = window_copy_common_init(wme);
        data->viewmode = 1;

        data->backing = xmalloc(sizeof *data->backing);
        screen_init(data->backing, sx, screen_size_y(base), UINT_MAX);
        data->ictx = input_init(NULL, NULL, NULL, NULL);
        data->mx = data->cx;
        data->my = screen_hsize(data->backing) + data->cy - data->oy;
        data->showmark = 0;

        return (&data->screen);
}

static void
window_copy_free(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;

        evtimer_del(&data->dragtimer);

        free(data->searchmark);
        free(data->searchstr);
        free(data->jumpchar);

        if (data->ictx != NULL)
                input_free(data->ictx);
        screen_free(data->backing);
        free(data->backing);

        screen_free(&data->screen);
        free(data);
}

void
window_copy_add(struct window_pane *wp, int parse, const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        window_copy_vadd(wp, parse, fmt, ap);
        va_end(ap);
}

static void
window_copy_init_ctx_cb(__unused struct screen_write_ctx *ctx,
    struct tty_ctx *ttyctx)
{
        memcpy(&ttyctx->defaults, &grid_default_cell, sizeof ttyctx->defaults);
        ttyctx->palette = NULL;
        ttyctx->redraw_cb = NULL;
        ttyctx->set_client_cb = NULL;
        ttyctx->arg = NULL;
}

void
window_copy_vadd(struct window_pane *wp, int parse, const char *fmt, va_list ap)
{
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *backing = data->backing;
        struct screen_write_ctx          backing_ctx, ctx;
        struct grid_cell                 gc;
        u_int                            old_hsize, old_cy;
        char                            *text;

        old_hsize = screen_hsize(data->backing);
        screen_write_start(&backing_ctx, backing);
        if (data->backing_written) {
                /*
                 * On the second or later line, do a CRLF before writing
                 * (so it's on a new line).
                 */
                screen_write_carriagereturn(&backing_ctx);
                screen_write_linefeed(&backing_ctx, 0, 8);
        } else
                data->backing_written = 1;
        old_cy = backing->cy;
        if (parse) {
                vasprintf(&text, fmt, ap);
                input_parse_screen(data->ictx, backing, window_copy_init_ctx_cb,
                    data, text, strlen(text));
                free(text);
        } else {
                memcpy(&gc, &grid_default_cell, sizeof gc);
                screen_write_vnputs(&backing_ctx, 0, &gc, fmt, ap);
        }
        screen_write_stop(&backing_ctx);

        data->oy += screen_hsize(data->backing) - old_hsize;

        screen_write_start_pane(&ctx, wp, &data->screen);

        /*
         * If the history has changed, draw the top line.
         * (If there's any history at all, it has changed.)
         */
        if (screen_hsize(data->backing))
                window_copy_redraw_lines(wme, 0, 1);

        /* Write the new lines. */
        window_copy_redraw_lines(wme, old_cy, backing->cy - old_cy + 1);

        screen_write_stop(&ctx);
}

void
window_copy_scroll(struct window_pane *wp, int sl_mpos, u_int my,
    int scroll_exit)
{
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);

        if (wme != NULL) {
                window_set_active_pane(wp->window, wp, 0);
                window_copy_scroll1(wme, wp, sl_mpos, my, scroll_exit);
        }
}

static void
window_copy_scroll1(struct window_mode_entry *wme, struct window_pane *wp,
    int sl_mpos, u_int my, int scroll_exit)
{
        struct window_copy_mode_data    *data = wme->data;
        u_int                            ox, oy, px, py, n, offset, size;
        u_int                            new_offset;
        u_int                            slider_height = wp->sb_slider_h;
        u_int                            sb_height = wp->sy, sb_top = wp->yoff;
        u_int                            sy = screen_size_y(data->backing);
        int                              new_slider_y, delta;

        /*
         * sl_mpos is where in the slider the user is dragging, mouse is
         * dragging this y point relative to top of slider.
         */
        if (my <= sb_top + sl_mpos) {
                /* Slider banged into top. */
                new_slider_y = sb_top - wp->yoff;
        } else if (my - sl_mpos > sb_top + sb_height - slider_height) {
                /* Slider banged into bottom. */
                new_slider_y = sb_top - wp->yoff + (sb_height - slider_height);
        } else {
                /* Slider is somewhere in the middle. */
                new_slider_y = my - wp->yoff - sl_mpos;
        }

        if (TAILQ_FIRST(&wp->modes) == NULL ||
            window_copy_get_current_offset(wp, &offset, &size) == 0)
                return;

        /*
         * See screen_redraw_draw_pane_scrollbar - this is the inverse of the
         * formula used there.
         */
        new_offset = new_slider_y * ((float)(size + sb_height) / sb_height);
        delta = (int)offset - new_offset;

        /*
         * Move pane view around based on delta relative to the cursor,
         * maintaining the selection.
         */
        oy = screen_hsize(data->backing) + data->cy - data->oy;
        ox = window_copy_find_length(wme, oy);

        if (data->cx != ox) {
                data->lastcx = data->cx;
                data->lastsx = ox;
        }
        data->cx = data->lastcx;

        if (delta >= 0) {
                n = (u_int)delta;
                if (data->oy + n > screen_hsize(data->backing)) {
                        data->oy = screen_hsize(data->backing);
                        if (data->cy < n)
                                data->cy = 0;
                        else
                                data->cy -= n;
                } else
                        data->oy += n;
        } else {
                n = (u_int)-delta;
                if (data->oy < n) {
                        data->oy = 0;
                        if (data->cy + (n - data->oy) >= sy)
                                data->cy = sy - 1;
                        else
                                data->cy += n - data->oy;
                } else
                        data->oy -= n;
        }

        /* Don't also drag tail when dragging a scrollbar, it looks weird. */
        data->cursordrag = CURSORDRAG_NONE;

        if (data->screen.sel == NULL || !data->rectflag) {
                py = screen_hsize(data->backing) + data->cy - data->oy;
                px = window_copy_find_length(wme, py);
                if ((data->cx >= data->lastsx && data->cx != px) ||
                    data->cx > px)
                        window_copy_cursor_end_of_line(wme);
        }

        if (scroll_exit && data->oy == 0) {
                window_pane_reset_mode(wp);
                return;
        }

        if (data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 1, 0);
        window_copy_redraw_screen(wme);
}

void
window_copy_pageup(struct window_pane *wp, int half_page)
{
        window_copy_pageup1(TAILQ_FIRST(&wp->modes), half_page);
}

static void
window_copy_pageup1(struct window_mode_entry *wme, int half_page)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        u_int                            n, ox, oy, px, py;

        oy = screen_hsize(data->backing) + data->cy - data->oy;
        ox = window_copy_find_length(wme, oy);

        if (data->cx != ox) {
                data->lastcx = data->cx;
                data->lastsx = ox;
        }
        data->cx = data->lastcx;

        n = 1;
        if (screen_size_y(s) > 2) {
                if (half_page)
                        n = screen_size_y(s) / 2;
                else
                        n = screen_size_y(s) - 2;
        }

        if (data->oy + n > screen_hsize(data->backing)) {
                data->oy = screen_hsize(data->backing);
                if (data->cy < n)
                        data->cy = 0;
                else
                        data->cy -= n;
        } else
                data->oy += n;

        if (data->screen.sel == NULL || !data->rectflag) {
                py = screen_hsize(data->backing) + data->cy - data->oy;
                px = window_copy_find_length(wme, py);
                if ((data->cx >= data->lastsx && data->cx != px) ||
                    data->cx > px)
                        window_copy_cursor_end_of_line(wme);
        }

        if (data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 1, 0);
        window_copy_redraw_screen(wme);
}

void
window_copy_pagedown(struct window_pane *wp, int half_page, int scroll_exit)
{
        if (window_copy_pagedown1(TAILQ_FIRST(&wp->modes), half_page,
            scroll_exit)) {
                window_pane_reset_mode(wp);
                return;
        }
}

static int
window_copy_pagedown1(struct window_mode_entry *wme, int half_page,
    int scroll_exit)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        u_int                            n, ox, oy, px, py;

        oy = screen_hsize(data->backing) + data->cy - data->oy;
        ox = window_copy_find_length(wme, oy);

        if (data->cx != ox) {
                data->lastcx = data->cx;
                data->lastsx = ox;
        }
        data->cx = data->lastcx;

        n = 1;
        if (screen_size_y(s) > 2) {
                if (half_page)
                        n = screen_size_y(s) / 2;
                else
                        n = screen_size_y(s) - 2;
        }

        if (data->oy < n) {
                data->oy = 0;
                if (data->cy + (n - data->oy) >= screen_size_y(data->backing))
                        data->cy = screen_size_y(data->backing) - 1;
                else
                        data->cy += n - data->oy;
        } else
                data->oy -= n;

        if (data->screen.sel == NULL || !data->rectflag) {
                py = screen_hsize(data->backing) + data->cy - data->oy;
                px = window_copy_find_length(wme, py);
                if ((data->cx >= data->lastsx && data->cx != px) ||
                    data->cx > px)
                        window_copy_cursor_end_of_line(wme);
        }

        if (scroll_exit && data->oy == 0)
                return (1);
        if (data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 1, 0);
        window_copy_redraw_screen(wme);
        return (0);
}

static void
window_copy_previous_paragraph(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        u_int                            oy;

        oy = screen_hsize(data->backing) + data->cy - data->oy;

        while (oy > 0 && window_copy_find_length(wme, oy) == 0)
                oy--;

        while (oy > 0 && window_copy_find_length(wme, oy) > 0)
                oy--;

        window_copy_scroll_to(wme, 0, oy, 0);
}

static void
window_copy_next_paragraph(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        u_int                            maxy, ox, oy;

        oy = screen_hsize(data->backing) + data->cy - data->oy;
        maxy = screen_hsize(data->backing) + screen_size_y(s) - 1;

        while (oy < maxy && window_copy_find_length(wme, oy) == 0)
                oy++;

        while (oy < maxy && window_copy_find_length(wme, oy) > 0)
                oy++;

        ox = window_copy_find_length(wme, oy);
        window_copy_scroll_to(wme, ox, oy, 0);
}

char *
window_copy_get_word(struct window_pane *wp, u_int x, u_int y)
{
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->backing->grid;

        return (format_grid_word(gd, x, gd->hsize + y - data->oy));
}

char *
window_copy_get_line(struct window_pane *wp, u_int y)
{
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->screen.grid;

        return (format_grid_line(gd, gd->hsize + y));
}

char *
window_copy_get_hyperlink(struct window_pane *wp, u_int x, u_int y)
{
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->screen.grid;

        return (format_grid_hyperlink(gd, x, gd->hsize + y, wp->screen));
}

static void *
window_copy_cursor_hyperlink_cb(struct format_tree *ft)
{
        struct window_pane              *wp = format_get_pane(ft);
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->screen.grid;

        return (format_grid_hyperlink(gd, data->cx, gd->hsize + data->cy,
            &data->screen));
}

static void *
window_copy_cursor_word_cb(struct format_tree *ft)
{
        struct window_pane              *wp = format_get_pane(ft);
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;

        return (window_copy_get_word(wp, data->cx, data->cy));
}

static void *
window_copy_cursor_line_cb(struct format_tree *ft)
{
        struct window_pane              *wp = format_get_pane(ft);
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;

        return (window_copy_get_line(wp, data->cy));
}

static void *
window_copy_search_match_cb(struct format_tree *ft)
{
        struct window_pane              *wp = format_get_pane(ft);
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;

        return (window_copy_match_at_cursor(data));
}

static void
window_copy_formats(struct window_mode_entry *wme, struct format_tree *ft)
{
        struct window_copy_mode_data    *data = wme->data;
        u_int                            hsize = screen_hsize(data->backing);
        struct grid_line                *gl;

        gl = grid_get_line(data->backing->grid, hsize - data->oy);
        format_add(ft, "top_line_time", "%llu", (unsigned long long)gl->time);

        format_add(ft, "scroll_position", "%d", data->oy);
        format_add(ft, "rectangle_toggle", "%d", data->rectflag);

        format_add(ft, "copy_cursor_x", "%d", data->cx);
        format_add(ft, "copy_cursor_y", "%d", data->cy);

        if (data->screen.sel != NULL) {
                format_add(ft, "selection_start_x", "%d", data->selx);
                format_add(ft, "selection_start_y", "%d", data->sely);
                format_add(ft, "selection_end_x", "%d", data->endselx);
                format_add(ft, "selection_end_y", "%d", data->endsely);

                if (data->cursordrag != CURSORDRAG_NONE)
                        format_add(ft, "selection_active", "1");
                else
                        format_add(ft, "selection_active", "0");
                if (data->endselx != data->selx || data->endsely != data->sely)
                        format_add(ft, "selection_present", "1");
                else
                        format_add(ft, "selection_present", "0");
        } else {
                format_add(ft, "selection_active", "0");
                format_add(ft, "selection_present", "0");
        }

        switch (data->selflag) {
        case SEL_CHAR:
                format_add(ft, "selection_mode", "char");
                break;
        case SEL_WORD:
                format_add(ft, "selection_mode", "word");
                break;
        case SEL_LINE:
                format_add(ft, "selection_mode", "line");
                break;
        }

        format_add(ft, "search_present", "%d", data->searchmark != NULL);
        format_add(ft, "search_timed_out", "%d", data->timeout);
        if (data->searchcount != -1) {
                format_add(ft, "search_count", "%d", data->searchcount);
                format_add(ft, "search_count_partial", "%d", data->searchmore);
        }
        format_add_cb(ft, "search_match", window_copy_search_match_cb);

        format_add_cb(ft, "copy_cursor_word", window_copy_cursor_word_cb);
        format_add_cb(ft, "copy_cursor_line", window_copy_cursor_line_cb);
        format_add_cb(ft, "copy_cursor_hyperlink",
            window_copy_cursor_hyperlink_cb);
}

static struct screen *
window_copy_get_screen(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;

        return (data->backing);
}

static void
window_copy_size_changed(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        struct screen_write_ctx          ctx;
        int                              search = (data->searchmark != NULL);

        window_copy_clear_selection(wme);
        window_copy_clear_marks(wme);

        screen_write_start(&ctx, s);
        window_copy_write_lines(wme, &ctx, 0, screen_size_y(s));
        screen_write_stop(&ctx);

        if (search && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 0);
        data->searchx = data->cx;
        data->searchy = data->cy;
        data->searcho = data->oy;
}

static void
window_copy_resize(struct window_mode_entry *wme, u_int sx, u_int sy)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        struct grid                     *gd = data->backing->grid;
        u_int                            cx, cy, wx, wy;
        int                              reflow;

        screen_resize(s, sx, sy, 0);
        cx = data->cx;
        if (data->oy > gd->hsize + data->cy)
                data->oy = gd->hsize + data->cy;
        cy = gd->hsize + data->cy - data->oy;
        reflow = (gd->sx != sx);
        if (reflow)
                grid_wrap_position(gd, cx, cy, &wx, &wy);
        screen_resize_cursor(data->backing, sx, sy, 1, 0, 0);
        if (reflow)
                grid_unwrap_position(gd, &cx, &cy, wx, wy);

        data->cx = cx;
        if (cy < gd->hsize) {
                data->cy = 0;
                data->oy = gd->hsize - cy;
        } else {
                data->cy = cy - gd->hsize;
                data->oy = 0;
        }

        window_copy_size_changed(wme);
        window_copy_redraw_screen(wme);
}

static const char *
window_copy_key_table(struct window_mode_entry *wme)
{
        struct window_pane      *wp = wme->wp;

        if (options_get_number(wp->window->options, "mode-keys") == MODEKEY_VI)
                return ("copy-mode-vi");
        return ("copy-mode");
}

static int
window_copy_expand_search_string(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        const char                      *ss = args_string(cs->wargs, 0);
        char                            *expanded;

        if (ss == NULL || *ss == '\0')
                return (0);

        if (args_has(cs->args, 'F')) {
                expanded = format_single(NULL, ss, NULL, NULL, NULL, wme->wp);
                if (*expanded == '\0') {
                        free(expanded);
                        return (0);
                }
                free(data->searchstr);
                data->searchstr = expanded;
        } else {
                free(data->searchstr);
                data->searchstr = xstrdup(ss);
        }
        return (1);
}

static enum window_copy_cmd_action
window_copy_cmd_append_selection(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct session                  *s = cs->s;

        if (s != NULL)
                window_copy_append_selection(wme);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_append_selection_and_cancel(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct session                  *s = cs->s;

        if (s != NULL)
                window_copy_append_selection(wme);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_CANCEL);
}

static enum window_copy_cmd_action
window_copy_cmd_back_to_indentation(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cursor_back_to_indentation(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_begin_selection(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct client                   *c = cs->c;
        struct mouse_event              *m = cs->m;
        struct window_copy_mode_data    *data = wme->data;

        if (m != NULL) {
                window_copy_start_drag(c, m);
                return (WINDOW_COPY_CMD_NOTHING);
        }

        data->lineflag = LINE_SEL_NONE;
        data->selflag = SEL_CHAR;
        window_copy_start_selection(wme);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_stop_selection(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->cursordrag = CURSORDRAG_NONE;
        data->lineflag = LINE_SEL_NONE;
        data->selflag = SEL_CHAR;
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_bottom_line(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->cx = 0;
        data->cy = screen_size_y(&data->screen) - 1;

        window_copy_update_selection(wme, 1, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_cancel(__unused struct window_copy_cmd_state *cs)
{
        return (WINDOW_COPY_CMD_CANCEL);
}

static enum window_copy_cmd_action
window_copy_cmd_clear_selection(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_do_copy_end_of_line(struct window_copy_cmd_state *cs, int pipe,
    int cancel)
{
        struct window_mode_entry         *wme = cs->wme;
        struct client                    *c = cs->c;
        struct session                   *s = cs->s;
        struct winlink                   *wl = cs->wl;
        struct window_pane               *wp = wme->wp;
        u_int                             count = args_count(cs->wargs);
        u_int                             np = wme->prefix, ocx, ocy, ooy;
        struct window_copy_mode_data     *data = wme->data;
        char                             *prefix = NULL, *command = NULL;
        const char                       *arg0 = args_string(cs->wargs, 0);
        const char                       *arg1 = args_string(cs->wargs, 1);
        int                               set_paste = !args_has(cs->wargs, 'P');
        int                               set_clip = !args_has(cs->wargs, 'C');

        if (pipe) {
                if (count == 2)
                        prefix = format_single(NULL, arg1, c, s, wl, wp);
                if (s != NULL && count > 0 && *arg0 != '\0')
                        command = format_single(NULL, arg0, c, s, wl, wp);
        } else {
                if (count == 1)
                        prefix = format_single(NULL, arg0, c, s, wl, wp);
        }

        ocx = data->cx;
        ocy = data->cy;
        ooy = data->oy;

        window_copy_start_selection(wme);
        for (; np > 1; np--)
                window_copy_cursor_down(wme, 0);
        window_copy_cursor_end_of_line(wme);

        if (s != NULL) {
                if (pipe)
                        window_copy_copy_pipe(wme, s, prefix, command,
                            set_paste, set_clip);
                else
                        window_copy_copy_selection(wme, prefix,
                            set_paste, set_clip);

                if (cancel) {
                        free(prefix);
                        free(command);
                        return (WINDOW_COPY_CMD_CANCEL);
                }
        }
        window_copy_clear_selection(wme);

        data->cx = ocx;
        data->cy = ocy;
        data->oy = ooy;

        free(prefix);
        free(command);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_copy_end_of_line(struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_end_of_line(cs, 0, 0));
}

static enum window_copy_cmd_action
window_copy_cmd_copy_end_of_line_and_cancel(struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_end_of_line(cs, 0, 1));
}

static enum window_copy_cmd_action
window_copy_cmd_copy_pipe_end_of_line(struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_end_of_line(cs, 1, 0));
}

static enum window_copy_cmd_action
window_copy_cmd_copy_pipe_end_of_line_and_cancel(
    struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_end_of_line(cs, 1, 1));
}

static enum window_copy_cmd_action
window_copy_do_copy_line(struct window_copy_cmd_state *cs, int pipe, int cancel)
{
        struct window_mode_entry         *wme = cs->wme;
        struct client                    *c = cs->c;
        struct session                   *s = cs->s;
        struct winlink                   *wl = cs->wl;
        struct window_pane               *wp = wme->wp;
        struct window_copy_mode_data     *data = wme->data;
        u_int                             count = args_count(cs->wargs);
        u_int                             np = wme->prefix, ocx, ocy, ooy;
        char                             *prefix = NULL, *command = NULL;
        const char                       *arg0 = args_string(cs->wargs, 0);
        const char                       *arg1 = args_string(cs->wargs, 1);
        int                               set_paste = !args_has(cs->wargs, 'P');
        int                               set_clip = !args_has(cs->wargs, 'C');

        if (pipe) {
                if (count == 2)
                        prefix = format_single(NULL, arg1, c, s, wl, wp);
                if (s != NULL && count > 0 && *arg0 != '\0')
                        command = format_single(NULL, arg0, c, s, wl, wp);
        } else {
                if (count == 1)
                        prefix = format_single(NULL, arg0, c, s, wl, wp);
        }

        ocx = data->cx;
        ocy = data->cy;
        ooy = data->oy;

        data->selflag = SEL_CHAR;
        window_copy_cursor_start_of_line(wme);
        window_copy_start_selection(wme);
        for (; np > 1; np--)
                window_copy_cursor_down(wme, 0);
        window_copy_cursor_end_of_line(wme);

        if (s != NULL) {
                if (pipe)
                        window_copy_copy_pipe(wme, s, prefix, command,
                            set_paste, set_clip);
                else
                        window_copy_copy_selection(wme, prefix,
                            set_paste, set_clip);

                if (cancel) {
                        free(prefix);
                        free(command);
                        return (WINDOW_COPY_CMD_CANCEL);
                }
        }
        window_copy_clear_selection(wme);

        data->cx = ocx;
        data->cy = ocy;
        data->oy = ooy;

        free(prefix);
        free(command);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_copy_line(struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_line(cs, 0, 0));
}

static enum window_copy_cmd_action
window_copy_cmd_copy_line_and_cancel(struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_line(cs, 0, 1));
}

static enum window_copy_cmd_action
window_copy_cmd_copy_pipe_line(struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_line(cs, 1, 0));
}

static enum window_copy_cmd_action
window_copy_cmd_copy_pipe_line_and_cancel(struct window_copy_cmd_state *cs)
{
        return (window_copy_do_copy_line(cs, 1, 1));
}

static enum window_copy_cmd_action
window_copy_cmd_copy_selection_no_clear(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct client                   *c = cs->c;
        struct session                  *s = cs->s;
        struct winlink                  *wl = cs->wl;
        struct window_pane              *wp = wme->wp;
        char                            *prefix = NULL;
        const char                      *arg0 = args_string(cs->wargs, 0);
        int                              set_paste = !args_has(cs->wargs, 'P');
        int                              set_clip = !args_has(cs->wargs, 'C');

        if (arg0 != NULL)
                prefix = format_single(NULL, arg0, c, s, wl, wp);

        if (s != NULL)
                window_copy_copy_selection(wme, prefix, set_paste, set_clip);

        free(prefix);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_copy_selection(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cmd_copy_selection_no_clear(cs);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_copy_selection_and_cancel(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cmd_copy_selection_no_clear(cs);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_CANCEL);
}

static enum window_copy_cmd_action
window_copy_cmd_cursor_down(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_down(wme, 0);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_cursor_down_and_cancel(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix, cy;

        cy = data->cy;
        for (; np != 0; np--)
                window_copy_cursor_down(wme, 0);
        if (cy == data->cy && data->oy == 0)
                return (WINDOW_COPY_CMD_CANCEL);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_cursor_left(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_left(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_cursor_right(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        for (; np != 0; np--) {
                window_copy_cursor_right(wme, data->screen.sel != NULL &&
                    data->rectflag);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

/* Scroll line containing the cursor to the given position. */
static enum window_copy_cmd_action
window_copy_cmd_scroll_to(struct window_copy_cmd_state *cs, u_int to)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            oy, delta;
        int                              scroll_up; /* >0 up, <0 down */

        scroll_up = data->cy - to;
        delta = abs(scroll_up);
        oy = screen_hsize(data->backing) - data->oy;

        /*
         * oy is the maximum scroll down amount, while data->oy is the maximum
         * scroll up amount.
         */
        if (scroll_up > 0 && data->oy >= delta) {
                window_copy_scroll_up(wme, delta);
                data->cy -= delta;
        } else if (scroll_up < 0 && oy >= delta) {
                window_copy_scroll_down(wme, delta);
                data->cy += delta;
        }

        window_copy_update_selection(wme, 0, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

/* Scroll line containing the cursor to the bottom. */
static enum window_copy_cmd_action
window_copy_cmd_scroll_bottom(struct window_copy_cmd_state *cs)
{
        struct window_copy_mode_data    *data = cs->wme->data;
        u_int                            bottom;

        bottom = screen_size_y(&data->screen) - 1;
        return (window_copy_cmd_scroll_to(cs, bottom));
}

/* Scroll line containing the cursor to the middle. */
static enum window_copy_cmd_action
window_copy_cmd_scroll_middle(struct window_copy_cmd_state *cs)
{
        struct window_copy_mode_data    *data = cs->wme->data;
        u_int                            mid_value;

        mid_value = (screen_size_y(&data->screen) - 1) / 2;
        return (window_copy_cmd_scroll_to(cs, mid_value));
}

/* Scroll the pane to the mouse in the scrollbar. */
static enum window_copy_cmd_action
window_copy_cmd_scroll_to_mouse(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_pane              *wp = wme->wp;
        struct client                   *c = cs->c;
        struct mouse_event              *m = cs->m;
        int                              scroll_exit = args_has(cs->wargs, 'e');

        window_copy_scroll(wp, c->tty.mouse_slider_mpos, m->y, scroll_exit);
        return (WINDOW_COPY_CMD_NOTHING);
}

/* Scroll line containing the cursor to the top. */
static enum window_copy_cmd_action
window_copy_cmd_scroll_top(struct window_copy_cmd_state *cs)
{
        return (window_copy_cmd_scroll_to(cs, 0));
}

static enum window_copy_cmd_action
window_copy_cmd_cursor_up(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_up(wme, 0);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_centre_vertical(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        window_copy_update_cursor(wme, data->cx,  wme->wp->sy / 2);
        window_copy_update_selection(wme, 1, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_centre_horizontal(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        window_copy_update_cursor(wme, wme->wp->sx / 2, data->cy);
        window_copy_update_selection(wme, 1, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_end_of_line(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cursor_end_of_line(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_halfpage_down(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        for (; np != 0; np--) {
                if (window_copy_pagedown1(wme, 1, data->scroll_exit))
                        return (WINDOW_COPY_CMD_CANCEL);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_halfpage_down_and_cancel(struct window_copy_cmd_state *cs)
{

        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--) {
                if (window_copy_pagedown1(wme, 1, 1))
                        return (WINDOW_COPY_CMD_CANCEL);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_halfpage_up(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_pageup1(wme, 1);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_toggle_position(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->hide_position = !data->hide_position;
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_history_bottom(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = data->backing;
        u_int                            oy;

        oy = screen_hsize(s) + data->cy - data->oy;
        if (data->lineflag == LINE_SEL_RIGHT_LEFT && oy == data->endsely)
                window_copy_other_end(wme);

        data->cy = screen_size_y(&data->screen) - 1;
        data->cx = window_copy_find_length(wme, screen_hsize(s) + data->cy);
        data->oy = 0;

        if (data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 1, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_history_top(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            oy;

        oy = screen_hsize(data->backing) + data->cy - data->oy;
        if (data->lineflag == LINE_SEL_LEFT_RIGHT && oy == data->sely)
                window_copy_other_end(wme);

        data->cy = 0;
        data->cx = 0;
        data->oy = screen_hsize(data->backing);

        if (data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 1, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_jump_again(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        switch (data->jumptype) {
        case WINDOW_COPY_JUMPFORWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump(wme);
                break;
        case WINDOW_COPY_JUMPBACKWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump_back(wme);
                break;
        case WINDOW_COPY_JUMPTOFORWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump_to(wme);
                break;
        case WINDOW_COPY_JUMPTOBACKWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump_to_back(wme);
                break;
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_jump_reverse(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        switch (data->jumptype) {
        case WINDOW_COPY_JUMPFORWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump_back(wme);
                break;
        case WINDOW_COPY_JUMPBACKWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump(wme);
                break;
        case WINDOW_COPY_JUMPTOFORWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump_to_back(wme);
                break;
        case WINDOW_COPY_JUMPTOBACKWARD:
                for (; np != 0; np--)
                        window_copy_cursor_jump_to(wme);
                break;
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_middle_line(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->cx = 0;
        data->cy = (screen_size_y(&data->screen) - 1) / 2;

        window_copy_update_selection(wme, 1, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_previous_matching_bracket(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = data->backing;
        char                             open[] = "{[(", close[] = "}])";
        char                             tried, found, start, *cp;
        u_int                            px, py, xx, n;
        struct grid_cell                 gc;
        int                              failed;

        for (; np != 0; np--) {
                /* Get cursor position and line length. */
                px = data->cx;
                py = screen_hsize(s) + data->cy - data->oy;
                xx = window_copy_find_length(wme, py);
                if (xx == 0)
                        break;

                /*
                 * Get the current character. If not on a bracket, try the
                 * previous. If still not, then behave like previous-word.
                 */
                tried = 0;
        retry:
                grid_get_cell(s->grid, px, py, &gc);
                if (gc.data.size != 1 || (gc.flags & GRID_FLAG_PADDING))
                        cp = NULL;
                else {
                        found = *gc.data.data;
                        cp = strchr(close, found);
                }
                if (cp == NULL) {
                        if (data->modekeys == MODEKEY_EMACS) {
                                if (!tried && px > 0) {
                                        px--;
                                        tried = 1;
                                        goto retry;
                                }
                                window_copy_cursor_previous_word(wme, close, 1);
                        }
                        continue;
                }
                start = open[cp - close];

                /* Walk backward until the matching bracket is reached. */
                n = 1;
                failed = 0;
                do {
                        if (px == 0) {
                                if (py == 0) {
                                        failed = 1;
                                        break;
                                }
                                do {
                                        py--;
                                        xx = window_copy_find_length(wme, py);
                                } while (xx == 0 && py > 0);
                                if (xx == 0 && py == 0) {
                                        failed = 1;
                                        break;
                                }
                                px = xx - 1;
                        } else
                                px--;

                        grid_get_cell(s->grid, px, py, &gc);
                        if (gc.data.size == 1 &&
                            (~gc.flags & GRID_FLAG_PADDING)) {
                                if (*gc.data.data == found)
                                        n++;
                                else if (*gc.data.data == start)
                                        n--;
                        }
                } while (n != 0);

                /* Move the cursor to the found location if any. */
                if (!failed)
                        window_copy_scroll_to(wme, px, py, 0);
        }

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_next_matching_bracket(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = data->backing;
        char                             open[] = "{[(", close[] = "}])";
        char                             tried, found, end, *cp;
        u_int                            px, py, xx, yy, sx, sy, n;
        struct grid_cell                 gc;
        int                              failed;
        struct grid_line                *gl;

        for (; np != 0; np--) {
                /* Get cursor position and line length. */
                px = data->cx;
                py = screen_hsize(s) + data->cy - data->oy;
                xx = window_copy_find_length(wme, py);
                yy = screen_hsize(s) + screen_size_y(s) - 1;
                if (xx == 0)
                        break;

                /*
                 * Get the current character. If not on a bracket, try the
                 * next. If still not, then behave like next-word.
                 */
                tried = 0;
        retry:
                grid_get_cell(s->grid, px, py, &gc);
                if (gc.data.size != 1 || (gc.flags & GRID_FLAG_PADDING))
                        cp = NULL;
                else {
                        found = *gc.data.data;

                        /*
                         * In vi mode, attempt to move to previous bracket if a
                         * closing bracket is found first. If this fails,
                         * return to the original cursor position.
                         */
                        cp = strchr(close, found);
                        if (cp != NULL && data->modekeys == MODEKEY_VI) {
                                sx = data->cx;
                                sy = screen_hsize(s) + data->cy - data->oy;

                                window_copy_scroll_to(wme, px, py, 0);
                                window_copy_cmd_previous_matching_bracket(cs);

                                px = data->cx;
                                py = screen_hsize(s) + data->cy - data->oy;
                                grid_get_cell(s->grid, px, py, &gc);
                                if (gc.data.size == 1 &&
                                    (~gc.flags & GRID_FLAG_PADDING) &&
                                    strchr(close, *gc.data.data) != NULL)
                                        window_copy_scroll_to(wme, sx, sy, 0);
                                break;
                        }

                        cp = strchr(open, found);
                }
                if (cp == NULL) {
                        if (data->modekeys == MODEKEY_EMACS) {
                                if (!tried && px <= xx) {
                                        px++;
                                        tried = 1;
                                        goto retry;
                                }
                                window_copy_cursor_next_word_end(wme, open, 0);
                                continue;
                        }
                        /* For vi, continue searching for bracket until EOL. */
                        if (px > xx) {
                                if (py == yy)
                                        continue;
                                gl = grid_get_line(s->grid, py);
                                if (~gl->flags & GRID_LINE_WRAPPED)
                                        continue;
                                if (gl->cellsize > s->grid->sx)
                                        continue;
                                px = 0;
                                py++;
                                xx = window_copy_find_length(wme, py);
                        } else
                                px++;
                        goto retry;
                }
                end = close[cp - open];

                /* Walk forward until the matching bracket is reached. */
                n = 1;
                failed = 0;
                do {
                        if (px > xx) {
                                if (py == yy) {
                                        failed = 1;
                                        break;
                                }
                                px = 0;
                                py++;
                                xx = window_copy_find_length(wme, py);
                        } else
                                px++;

                        grid_get_cell(s->grid, px, py, &gc);
                        if (gc.data.size == 1 &&
                            (~gc.flags & GRID_FLAG_PADDING)) {
                                if (*gc.data.data == found)
                                        n++;
                                else if (*gc.data.data == end)
                                        n--;
                        }
                } while (n != 0);

                /* Move the cursor to the found location if any. */
                if (!failed)
                        window_copy_scroll_to(wme, px, py, 0);
        }

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_next_paragraph(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_next_paragraph(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_next_space(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_next_word(wme, "");
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_next_space_end(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_next_word_end(wme, "", 0);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_next_word(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;
        const char                      *separators;

        separators = options_get_string(cs->s->options, "word-separators");

        for (; np != 0; np--)
                window_copy_cursor_next_word(wme, separators);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_next_word_end(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;
        const char                      *separators;

        separators = options_get_string(cs->s->options, "word-separators");

        for (; np != 0; np--)
                window_copy_cursor_next_word_end(wme, separators, 0);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_other_end(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;
        struct window_copy_mode_data    *data = wme->data;

        data->selflag = SEL_CHAR;
        if ((np % 2) != 0)
                window_copy_other_end(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_selection_mode(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct options                  *so = cs->s->options;
        struct window_copy_mode_data    *data = wme->data;
        const char                      *s = args_string(cs->wargs, 0);

        if (s == NULL || strcasecmp(s, "char") == 0 || strcasecmp(s, "c") == 0)
                data->selflag = SEL_CHAR;
        else if (strcasecmp(s, "word") == 0 || strcasecmp(s, "w") == 0) {
                data->separators = options_get_string(so, "word-separators");
                data->selflag = SEL_WORD;
        } else if (strcasecmp(s, "line") == 0 || strcasecmp(s, "l") == 0)
                data->selflag = SEL_LINE;
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_page_down(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        for (; np != 0; np--) {
                if (window_copy_pagedown1(wme, 0, data->scroll_exit))
                        return (WINDOW_COPY_CMD_CANCEL);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_page_down_and_cancel(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--) {
                if (window_copy_pagedown1(wme, 0, 1))
                        return (WINDOW_COPY_CMD_CANCEL);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_page_up(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_pageup1(wme, 0);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_previous_paragraph(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_previous_paragraph(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_previous_space(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_previous_word(wme, "", 1);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_previous_word(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;
        const char                      *separators;

        separators = options_get_string(cs->s->options, "word-separators");

        for (; np != 0; np--)
                window_copy_cursor_previous_word(wme, separators, 1);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_rectangle_on(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->lineflag = LINE_SEL_NONE;
        window_copy_rectangle_set(wme, 1);

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_rectangle_off(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->lineflag = LINE_SEL_NONE;
        window_copy_rectangle_set(wme, 0);

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_rectangle_toggle(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->lineflag = LINE_SEL_NONE;
        window_copy_rectangle_set(wme, !data->rectflag);

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_scroll_exit_on(struct window_copy_cmd_state *cs)
{
        struct window_copy_mode_data    *data = cs->wme->data;

        data->scroll_exit = 1;

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_scroll_exit_off(struct window_copy_cmd_state *cs)
{
        struct window_copy_mode_data    *data = cs->wme->data;

        data->scroll_exit = 0;

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_scroll_exit_toggle(struct window_copy_cmd_state *cs)
{
        struct window_copy_mode_data    *data = cs->wme->data;

        data->scroll_exit = !data->scroll_exit;

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_scroll_down(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_down(wme, 1);
        if (data->scroll_exit && data->oy == 0)
                return (WINDOW_COPY_CMD_CANCEL);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_scroll_down_and_cancel(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_down(wme, 1);
        if (data->oy == 0)
                return (WINDOW_COPY_CMD_CANCEL);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_scroll_up(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        u_int                            np = wme->prefix;

        for (; np != 0; np--)
                window_copy_cursor_up(wme, 1);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_search_again(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        if (data->searchtype == WINDOW_COPY_SEARCHUP) {
                for (; np != 0; np--)
                        window_copy_search_up(wme, data->searchregex);
        } else if (data->searchtype == WINDOW_COPY_SEARCHDOWN) {
                for (; np != 0; np--)
                        window_copy_search_down(wme, data->searchregex);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_search_reverse(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        if (data->searchtype == WINDOW_COPY_SEARCHUP) {
                for (; np != 0; np--)
                        window_copy_search_down(wme, data->searchregex);
        } else if (data->searchtype == WINDOW_COPY_SEARCHDOWN) {
                for (; np != 0; np--)
                        window_copy_search_up(wme, data->searchregex);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_select_line(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        data->lineflag = LINE_SEL_LEFT_RIGHT;
        data->rectflag = 0;
        data->selflag = SEL_LINE;
        data->dx = data->cx;
        data->dy = screen_hsize(data->backing) + data->cy - data->oy;

        window_copy_cursor_start_of_line(wme);
        data->selrx = data->cx;
        data->selry = screen_hsize(data->backing) + data->cy - data->oy;
        data->endselry = data->selry;
        window_copy_start_selection(wme);
        window_copy_cursor_end_of_line(wme);
        data->endselry = screen_hsize(data->backing) + data->cy - data->oy;
        data->endselrx = window_copy_find_length(wme, data->endselry);
        for (; np > 1; np--) {
                window_copy_cursor_down(wme, 0);
                window_copy_cursor_end_of_line(wme);
        }

        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_select_word(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct options                  *so = cs->s->options;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            px, py, nextx, nexty;

        data->lineflag = LINE_SEL_LEFT_RIGHT;
        data->rectflag = 0;
        data->selflag = SEL_WORD;
        data->dx = data->cx;
        data->dy = screen_hsize(data->backing) + data->cy - data->oy;

        data->separators = options_get_string(so, "word-separators");
        window_copy_cursor_previous_word(wme, data->separators, 0);
        px = data->cx;
        py = screen_hsize(data->backing) + data->cy - data->oy;
        data->selrx = px;
        data->selry = py;
        window_copy_start_selection(wme);

        /* Handle single character words. */
        nextx = px + 1;
        nexty = py;
        if (grid_get_line(data->backing->grid, nexty)->flags &
            GRID_LINE_WRAPPED && nextx > screen_size_x(data->backing) - 1) {
                nextx = 0;
                nexty++;
        }
        if (px >= window_copy_find_length(wme, py) ||
            !window_copy_in_set(wme, nextx, nexty, WHITESPACE))
                window_copy_cursor_next_word_end(wme, data->separators, 1);
        else {
                window_copy_update_cursor(wme, px, data->cy);
                if (window_copy_update_selection(wme, 1, 1))
                        window_copy_redraw_lines(wme, data->cy, 1);
        }
        data->endselrx = data->cx;
        data->endselry = screen_hsize(data->backing) + data->cy - data->oy;
        if (data->dy > data->endselry) {
                data->dy = data->endselry;
                data->dx = data->endselrx;
        } else if (data->dx > data->endselrx)
                data->dx = data->endselrx;

        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_set_mark(struct window_copy_cmd_state *cs)
{
        struct window_copy_mode_data    *data = cs->wme->data;

        data->mx = data->cx;
        data->my = screen_hsize(data->backing) + data->cy - data->oy;
        data->showmark = 1;
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_start_of_line(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cursor_start_of_line(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_top_line(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;

        data->cx = 0;
        data->cy = 0;

        window_copy_update_selection(wme, 1, 0);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_copy_pipe_no_clear(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct client                   *c = cs->c;
        struct session                  *s = cs->s;
        struct winlink                  *wl = cs->wl;
        struct window_pane              *wp = wme->wp;
        char                            *command = NULL, *prefix = NULL;
        const char                      *arg0 = args_string(cs->wargs, 0);
        const char                      *arg1 = args_string(cs->wargs, 1);
        int                              set_paste = !args_has(cs->wargs, 'P');
        int                              set_clip = !args_has(cs->wargs, 'C');

        if (arg1 != NULL)
                prefix = format_single(NULL, arg1, c, s, wl, wp);

        if (s != NULL && arg0 != NULL && *arg0 != '\0')
                command = format_single(NULL, arg0, c, s, wl, wp);
        window_copy_copy_pipe(wme, s, prefix, command,
            set_paste, set_clip);
        free(command);

        free(prefix);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_copy_pipe(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cmd_copy_pipe_no_clear(cs);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_copy_pipe_and_cancel(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cmd_copy_pipe_no_clear(cs);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_CANCEL);
}

static enum window_copy_cmd_action
window_copy_cmd_pipe_no_clear(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct client                   *c = cs->c;
        struct session                  *s = cs->s;
        struct winlink                  *wl = cs->wl;
        struct window_pane              *wp = wme->wp;
        char                            *command = NULL;
        const char                      *arg0 = args_string(cs->wargs, 0);

        if (s != NULL && arg0 != NULL && *arg0 != '\0')
                command = format_single(NULL, arg0, c, s, wl, wp);
        window_copy_pipe(wme, s, command);
        free(command);

        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_pipe(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cmd_pipe_no_clear(cs);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_REDRAW);
}

static enum window_copy_cmd_action
window_copy_cmd_pipe_and_cancel(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cmd_pipe_no_clear(cs);
        window_copy_clear_selection(wme);
        return (WINDOW_COPY_CMD_CANCEL);
}

static enum window_copy_cmd_action
window_copy_cmd_goto_line(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        const char                      *arg0 = args_string(cs->wargs, 0);

        if (*arg0 != '\0')
                window_copy_goto_line(wme, arg0);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_jump_backward(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;
        const char                      *arg0 = args_string(cs->wargs, 0);

        if (*arg0 != '\0') {
                data->jumptype = WINDOW_COPY_JUMPBACKWARD;
                free(data->jumpchar);
                data->jumpchar = utf8_fromcstr(arg0);
                for (; np != 0; np--)
                        window_copy_cursor_jump_back(wme);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_jump_forward(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;
        const char                      *arg0 = args_string(cs->wargs, 0);

        if (*arg0 != '\0') {
                data->jumptype = WINDOW_COPY_JUMPFORWARD;
                free(data->jumpchar);
                data->jumpchar = utf8_fromcstr(arg0);
                for (; np != 0; np--)
                        window_copy_cursor_jump(wme);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_jump_to_backward(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;
        const char                      *arg0 = args_string(cs->wargs, 0);

        if (*arg0 != '\0') {
                data->jumptype = WINDOW_COPY_JUMPTOBACKWARD;
                free(data->jumpchar);
                data->jumpchar = utf8_fromcstr(arg0);
                for (; np != 0; np--)
                        window_copy_cursor_jump_to_back(wme);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_jump_to_forward(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;
        const char                      *arg0 = args_string(cs->wargs, 0);

        if (*arg0 != '\0') {
                data->jumptype = WINDOW_COPY_JUMPTOFORWARD;
                free(data->jumpchar);
                data->jumpchar = utf8_fromcstr(arg0);
                for (; np != 0; np--)
                        window_copy_cursor_jump_to(wme);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_jump_to_mark(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_jump_to_mark(wme);
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_next_prompt(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cursor_prompt(wme, 1, args_has(cs->wargs, 'o'));
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_previous_prompt(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;

        window_copy_cursor_prompt(wme, 0, args_has(cs->wargs, 'o'));
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_search_backward(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        if (!window_copy_expand_search_string(cs))
                return (WINDOW_COPY_CMD_NOTHING);

        if (data->searchstr != NULL) {
                data->searchtype = WINDOW_COPY_SEARCHUP;
                data->searchregex = 1;
                data->timeout = 0;
                for (; np != 0; np--)
                        window_copy_search_up(wme, 1);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_search_backward_text(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        if (!window_copy_expand_search_string(cs))
                return (WINDOW_COPY_CMD_NOTHING);

        if (data->searchstr != NULL) {
                data->searchtype = WINDOW_COPY_SEARCHUP;
                data->searchregex = 0;
                data->timeout = 0;
                for (; np != 0; np--)
                        window_copy_search_up(wme, 0);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_search_forward(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        if (!window_copy_expand_search_string(cs))
                return (WINDOW_COPY_CMD_NOTHING);

        if (data->searchstr != NULL) {
                data->searchtype = WINDOW_COPY_SEARCHDOWN;
                data->searchregex = 1;
                data->timeout = 0;
                for (; np != 0; np--)
                        window_copy_search_down(wme, 1);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_search_forward_text(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            np = wme->prefix;

        if (!window_copy_expand_search_string(cs))
                return (WINDOW_COPY_CMD_NOTHING);

        if (data->searchstr != NULL) {
                data->searchtype = WINDOW_COPY_SEARCHDOWN;
                data->searchregex = 0;
                data->timeout = 0;
                for (; np != 0; np--)
                        window_copy_search_down(wme, 0);
        }
        return (WINDOW_COPY_CMD_NOTHING);
}

static enum window_copy_cmd_action
window_copy_cmd_search_backward_incremental(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        const char                      *arg0 = args_string(cs->wargs, 0);
        const char                      *ss = data->searchstr;
        char                             prefix;
        enum window_copy_cmd_action      action = WINDOW_COPY_CMD_NOTHING;

        data->timeout = 0;

        log_debug("%s: %s", __func__, arg0);

        prefix = *arg0++;
        if (data->searchx == -1 || data->searchy == -1) {
                data->searchx = data->cx;
                data->searchy = data->cy;
                data->searcho = data->oy;
        } else if (ss != NULL && strcmp(arg0, ss) != 0) {
                data->cx = data->searchx;
                data->cy = data->searchy;
                data->oy = data->searcho;
                action = WINDOW_COPY_CMD_REDRAW;
        }
        if (*arg0 == '\0') {
                window_copy_clear_marks(wme);
                return (WINDOW_COPY_CMD_REDRAW);
        }
        switch (prefix) {
        case '=':
        case '-':
                data->searchtype = WINDOW_COPY_SEARCHUP;
                data->searchregex = 0;
                free(data->searchstr);
                data->searchstr = xstrdup(arg0);
                if (!window_copy_search_up(wme, 0)) {
                        window_copy_clear_marks(wme);
                        return (WINDOW_COPY_CMD_REDRAW);
                }
                break;
        case '+':
                data->searchtype = WINDOW_COPY_SEARCHDOWN;
                data->searchregex = 0;
                free(data->searchstr);
                data->searchstr = xstrdup(arg0);
                if (!window_copy_search_down(wme, 0)) {
                        window_copy_clear_marks(wme);
                        return (WINDOW_COPY_CMD_REDRAW);
                }
                break;
        }
        return (action);
}

static enum window_copy_cmd_action
window_copy_cmd_search_forward_incremental(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_copy_mode_data    *data = wme->data;
        const char                      *arg0 = args_string(cs->wargs, 0);
        const char                      *ss = data->searchstr;
        char                             prefix;
        enum window_copy_cmd_action      action = WINDOW_COPY_CMD_NOTHING;

        data->timeout = 0;

        log_debug("%s: %s", __func__, arg0);

        prefix = *arg0++;
        if (data->searchx == -1 || data->searchy == -1) {
                data->searchx = data->cx;
                data->searchy = data->cy;
                data->searcho = data->oy;
        } else if (ss != NULL && strcmp(arg0, ss) != 0) {
                data->cx = data->searchx;
                data->cy = data->searchy;
                data->oy = data->searcho;
                action = WINDOW_COPY_CMD_REDRAW;
        }
        if (*arg0 == '\0') {
                window_copy_clear_marks(wme);
                return (WINDOW_COPY_CMD_REDRAW);
        }
        switch (prefix) {
        case '=':
        case '+':
                data->searchtype = WINDOW_COPY_SEARCHDOWN;
                data->searchregex = 0;
                free(data->searchstr);
                data->searchstr = xstrdup(arg0);
                if (!window_copy_search_down(wme, 0)) {
                        window_copy_clear_marks(wme);
                        return (WINDOW_COPY_CMD_REDRAW);
                }
                break;
        case '-':
                data->searchtype = WINDOW_COPY_SEARCHUP;
                data->searchregex = 0;
                free(data->searchstr);
                data->searchstr = xstrdup(arg0);
                if (!window_copy_search_up(wme, 0)) {
                        window_copy_clear_marks(wme);
                        return (WINDOW_COPY_CMD_REDRAW);
                }
        }
        return (action);
}

static enum window_copy_cmd_action
window_copy_cmd_refresh_from_pane(struct window_copy_cmd_state *cs)
{
        struct window_mode_entry        *wme = cs->wme;
        struct window_pane              *wp = wme->swp;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            oy_from_top;

        if (data->viewmode)
                return (WINDOW_COPY_CMD_NOTHING);
        if (data->oy > screen_hsize(data->backing))
                data->oy = screen_hsize(data->backing);
        oy_from_top = screen_hsize(data->backing) - data->oy;

        screen_free(data->backing);
        free(data->backing);
        data->backing = window_copy_clone_screen(&wp->base, &data->screen, NULL,
            NULL, wme->swp != wme->wp);

        if (oy_from_top <= screen_hsize(data->backing))
                data->oy = screen_hsize(data->backing) - oy_from_top;
        else {
                data->cy = 0;
                data->oy = screen_hsize(data->backing);
        }

        window_copy_size_changed(wme);
        return (WINDOW_COPY_CMD_REDRAW);
}

static const struct {
        const char                       *command;
        u_int                             minargs;
        u_int                             maxargs;
        struct args_parse                 args;

#define WINDOW_COPY_CMD_FLAG_READONLY 0x1
        int                               flags;

        enum window_copy_cmd_clear        clear;
        enum window_copy_cmd_action     (*f)(struct window_copy_cmd_state *);
} window_copy_cmd_table[] = {
        { .command = "append-selection",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_append_selection
        },
        { .command = "append-selection-and-cancel",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_append_selection_and_cancel
        },
        { .command = "back-to-indentation",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_back_to_indentation
        },
        { .command = "begin-selection",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_begin_selection
        },
        { .command = "bottom-line",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_bottom_line
        },
        { .command = "cancel",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_cancel
        },
        { .command = "clear-selection",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_clear_selection
        },
        { .command = "copy-end-of-line",
          .args = { "CP", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_end_of_line
        },
        { .command = "copy-end-of-line-and-cancel",
          .args = { "CP", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_end_of_line_and_cancel
        },
        { .command = "copy-pipe-end-of-line",
          .args = { "CP", 0, 2, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_pipe_end_of_line
        },
        { .command = "copy-pipe-end-of-line-and-cancel",
          .args = { "CP", 0, 2, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_pipe_end_of_line_and_cancel
        },
        { .command = "copy-line",
          .args = { "CP", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_line
        },
        { .command = "copy-line-and-cancel",
          .args = { "CP", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_line_and_cancel
        },
        { .command = "copy-pipe-line",
          .args = { "CP", 0, 2, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_pipe_line
        },
        { .command = "copy-pipe-line-and-cancel",
          .args = { "CP", 0, 2, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_pipe_line_and_cancel
        },
        { .command = "copy-pipe-no-clear",
          .args = { "CP", 0, 2, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_NEVER,
          .f = window_copy_cmd_copy_pipe_no_clear
        },
        { .command = "copy-pipe",
          .args = { "CP", 0, 2, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_pipe
        },
        { .command = "copy-pipe-and-cancel",
          .args = { "CP", 0, 2, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_pipe_and_cancel
        },
        { .command = "copy-selection-no-clear",
          .args = { "CP", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_NEVER,
          .f = window_copy_cmd_copy_selection_no_clear
        },
        { .command = "copy-selection",
          .args = { "CP", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_selection
        },
        { .command = "copy-selection-and-cancel",
          .args = { "CP", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_copy_selection_and_cancel
        },
        { .command = "cursor-down",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_cursor_down
        },
        { .command = "cursor-down-and-cancel",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_cursor_down_and_cancel
        },
        { .command = "cursor-left",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_cursor_left
        },
        { .command = "cursor-right",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_cursor_right
        },
        { .command = "cursor-up",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_cursor_up
        },
        { .command = "cursor-centre-vertical",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_centre_vertical,
        },
        { .command = "cursor-centre-horizontal",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_centre_horizontal,
        },
        { .command = "end-of-line",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_end_of_line
        },
        { .command = "goto-line",
          .args = { "", 1, 1, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_goto_line
        },
        { .command = "halfpage-down",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_halfpage_down
        },
        { .command = "halfpage-down-and-cancel",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_halfpage_down_and_cancel
        },
        { .command = "halfpage-up",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_halfpage_up
        },
        { .command = "history-bottom",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_history_bottom
        },
        { .command = "history-top",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_history_top
        },
        { .command = "jump-again",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_jump_again
        },
        { .command = "jump-backward",
          .args = { "", 1, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_jump_backward
        },
        { .command = "jump-forward",
          .args = { "", 1, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_jump_forward
        },
        { .command = "jump-reverse",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_jump_reverse
        },
        { .command = "jump-to-backward",
          .args = { "", 1, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_jump_to_backward
        },
        { .command = "jump-to-forward",
          .args = { "", 1, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_jump_to_forward
        },
        { .command = "jump-to-mark",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_jump_to_mark
        },
        { .command = "next-prompt",
          .args = { "o", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_next_prompt
        },
        { .command = "previous-prompt",
          .args = { "o", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_previous_prompt
        },
        { .command = "middle-line",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_middle_line
        },
        { .command = "next-matching-bracket",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_next_matching_bracket
        },
        { .command = "next-paragraph",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_next_paragraph
        },
        { .command = "next-space",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_next_space
        },
        { .command = "next-space-end",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_next_space_end
        },
        { .command = "next-word",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_next_word
        },
        { .command = "next-word-end",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_next_word_end
        },
        { .command = "other-end",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_other_end
        },
        { .command = "page-down",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_page_down
        },
        { .command = "page-down-and-cancel",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_page_down_and_cancel
        },
        { .command = "page-up",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_page_up
        },
        { .command = "pipe-no-clear",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_NEVER,
          .f = window_copy_cmd_pipe_no_clear
        },
        { .command = "pipe",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_pipe
        },
        { .command = "pipe-and-cancel",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_pipe_and_cancel
        },
        { .command = "previous-matching-bracket",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_previous_matching_bracket
        },
        { .command = "previous-paragraph",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_previous_paragraph
        },
        { .command = "previous-space",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_previous_space
        },
        { .command = "previous-word",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_previous_word
        },
        { .command = "rectangle-on",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_rectangle_on
        },
        { .command = "rectangle-off",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_rectangle_off
        },
        { .command = "rectangle-toggle",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_rectangle_toggle
        },
        { .command = "refresh-from-pane",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_refresh_from_pane
        },
        { .command = "scroll-bottom",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_scroll_bottom
        },
        { .command = "scroll-down",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_scroll_down
        },
        { .command = "scroll-down-and-cancel",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_scroll_down_and_cancel
        },
        { .command = "scroll-exit-on",
          .args = { "", 0, 0, NULL },
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_scroll_exit_on
        },
        { .command = "scroll-exit-off",
          .args = { "", 0, 0, NULL },
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_scroll_exit_off
        },
        { .command = "scroll-exit-toggle",
          .args = { "", 0, 0, NULL },
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_scroll_exit_toggle
        },
        { .command = "scroll-middle",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_scroll_middle
        },
        { .command = "scroll-to-mouse",
          .args = { "e", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_scroll_to_mouse
        },
        { .command = "scroll-top",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_scroll_top
        },
        { .command = "scroll-up",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_scroll_up
        },
        { .command = "search-again",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_again
        },
        { .command = "search-backward",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_backward
        },
        { .command = "search-backward-text",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_backward_text
        },
        { .command = "search-backward-incremental",
          .args = { "", 1, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_backward_incremental
        },
        { .command = "search-forward",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_forward
        },
        { .command = "search-forward-text",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_forward_text
        },
        { .command = "search-forward-incremental",
          .args = { "", 1, 1, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_forward_incremental
        },
        { .command = "search-reverse",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_search_reverse
        },
        { .command = "select-line",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_select_line
        },
        { .command = "select-word",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_select_word
        },
        { .command = "selection-mode",
          .args = { "", 0, 1, NULL },
          .flags = 0,
          .clear = 0,
          .f = window_copy_cmd_selection_mode
        },
        { .command = "set-mark",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_set_mark
        },
        { .command = "start-of-line",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_start_of_line
        },
        { .command = "stop-selection",
          .args = { "", 0, 0, NULL },
          .flags = 0,
          .clear = WINDOW_COPY_CMD_CLEAR_ALWAYS,
          .f = window_copy_cmd_stop_selection
        },
        { .command = "toggle-position",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_NEVER,
          .f = window_copy_cmd_toggle_position
        },
        { .command = "top-line",
          .args = { "", 0, 0, NULL },
          .flags = WINDOW_COPY_CMD_FLAG_READONLY,
          .clear = WINDOW_COPY_CMD_CLEAR_EMACS_ONLY,
          .f = window_copy_cmd_top_line
        }
};

static void
window_copy_command(struct window_mode_entry *wme, struct client *c,
    struct session *s, struct winlink *wl, struct args *args,
    struct mouse_event *m)
{
        struct window_copy_mode_data    *data = wme->data;
        struct window_pane              *wp = wme->wp;
        struct window_copy_cmd_state     cs;
        enum window_copy_cmd_action      action;
        enum window_copy_cmd_clear       clear = WINDOW_COPY_CMD_CLEAR_NEVER;
        const char                      *command;
        u_int                            i, count = args_count(args);
        int                              keys, flags;
        char                            *error = NULL;

        if (count == 0)
                return;
        command = args_string(args, 0);

        if (m != NULL && m->valid && !MOUSE_WHEEL(m->b))
                window_copy_move_mouse(m);

        cs.wme = wme;
        cs.args = args;
        cs.wargs = NULL;
        cs.m = m;

        cs.c = c;
        cs.s = s;
        cs.wl = wl;

        action = WINDOW_COPY_CMD_NOTHING;
        for (i = 0; i < nitems(window_copy_cmd_table); i++) {
                if (strcmp(window_copy_cmd_table[i].command, command) == 0) {
                        flags = window_copy_cmd_table[i].flags;
                        if (c != NULL &&
                            c->flags & CLIENT_READONLY &&
                            (~flags & WINDOW_COPY_CMD_FLAG_READONLY)) {
                                status_message_set(c, -1, 1, 0, 0,
                                    "client is read-only");
                                return;
                        }

                        cs.wargs = args_parse(&window_copy_cmd_table[i].args,
                            args_values(args), count, &error);

                        if (error != NULL) {
                                free(error);
                                error = NULL;
                        }
                        if (cs.wargs == NULL)
                                break;

                        clear = window_copy_cmd_table[i].clear;
                        action = window_copy_cmd_table[i].f(&cs);
                        args_free(cs.wargs);
                        cs.wargs = NULL;
                        break;
                }
        }

        if (strncmp(command, "search-", 7) != 0 && data->searchmark != NULL) {
                keys = options_get_number(wp->window->options, "mode-keys");
                if (clear == WINDOW_COPY_CMD_CLEAR_EMACS_ONLY &&
                    keys == MODEKEY_VI)
                        clear = WINDOW_COPY_CMD_CLEAR_NEVER;
                if (clear != WINDOW_COPY_CMD_CLEAR_NEVER) {
                        window_copy_clear_marks(wme);
                        data->searchx = data->searchy = -1;
                }
                if (action == WINDOW_COPY_CMD_NOTHING)
                        action = WINDOW_COPY_CMD_REDRAW;
        }
        wme->prefix = 1;

        if (action == WINDOW_COPY_CMD_CANCEL)
                window_pane_reset_mode(wp);
        else if (action == WINDOW_COPY_CMD_REDRAW)
                window_copy_redraw_screen(wme);
        else if (action == WINDOW_COPY_CMD_NOTHING) {
                /*
                 * Nothing is not actually nothing - most commands at least
                 * move the cursor (what would be the point of a command that
                 * literally does nothing?) and in that case we need to redraw
                 * the first line to update the indicator.
                 */
                window_copy_redraw_lines(wme, 0, 1);
        }
}

static void
window_copy_scroll_to(struct window_mode_entry *wme, u_int px, u_int py,
    int no_redraw)
{
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->backing->grid;
        u_int                            offset, gap;

        data->cx = px;

        if (py >= gd->hsize - data->oy && py < gd->hsize - data->oy + gd->sy)
                data->cy = py - (gd->hsize - data->oy);
        else {
                gap = gd->sy / 4;
                if (py < gd->sy) {
                        offset = 0;
                        data->cy = py;
                } else if (py > gd->hsize + gd->sy - gap) {
                        offset = gd->hsize;
                        data->cy = py - gd->hsize;
                } else {
                        offset = py + gap - gd->sy;
                        data->cy = py - offset;
                }
                data->oy = gd->hsize - offset;
        }

        if (!no_redraw && data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 1, 0);
        if (!no_redraw)
                window_copy_redraw_screen(wme);
}

static int
window_copy_search_compare(struct grid *gd, u_int px, u_int py,
    struct grid *sgd, u_int spx, int cis)
{
        struct grid_cell         gc, sgc;
        const struct utf8_data  *ud, *sud;

        grid_get_cell(gd, px, py, &gc);
        ud = &gc.data;
        grid_get_cell(sgd, spx, 0, &sgc);
        sud = &sgc.data;

        if (*sud->data == '\t' && sud->size == 1 && gc.flags & GRID_FLAG_TAB)
                return (1);

        if (ud->size != sud->size || ud->width != sud->width)
                return (0);

        if (cis && ud->size == 1)
                return (tolower(ud->data[0]) == sud->data[0]);

        return (memcmp(ud->data, sud->data, ud->size) == 0);
}

static int
window_copy_search_lr(struct grid *gd, struct grid *sgd, u_int *ppx, u_int py,
    u_int first, u_int last, int cis)
{
        u_int                    ax, bx, px, pywrap, endline, padding;
        int                      matched;
        struct grid_line        *gl;
        struct grid_cell         gc;

        endline = gd->hsize + gd->sy - 1;
        for (ax = first; ax < last; ax++) {
                padding = 0;
                for (bx = 0; bx < sgd->sx; bx++) {
                        px = ax + bx + padding;
                        pywrap = py;
                        /* Wrap line. */
                        while (px >= gd->sx && pywrap < endline) {
                                gl = grid_get_line(gd, pywrap);
                                if (~gl->flags & GRID_LINE_WRAPPED)
                                        break;
                                px -= gd->sx;
                                pywrap++;
                        }
                        /* We have run off the end of the grid. */
                        if (px - padding >= gd->sx)
                                break;

                        grid_get_cell(gd, px, pywrap, &gc);
                        if (gc.flags & GRID_FLAG_TAB)
                                padding += gc.data.width - 1;

                        matched = window_copy_search_compare(gd, px, pywrap,
                            sgd, bx, cis);
                        if (!matched)
                                break;
                }
                if (bx == sgd->sx) {
                        *ppx = ax;
                        return (1);
                }
        }
        return (0);
}

static int
window_copy_search_rl(struct grid *gd,
    struct grid *sgd, u_int *ppx, u_int py, u_int first, u_int last, int cis)
{
        u_int                    ax, bx, px, pywrap, endline, padding;
        int                      matched;
        struct grid_line        *gl;
        struct grid_cell         gc;

        endline = gd->hsize + gd->sy - 1;
        for (ax = last; ax > first; ax--) {
                padding = 0;
                for (bx = 0; bx < sgd->sx; bx++) {
                        px = ax - 1 + bx + padding;
                        pywrap = py;
                        /* Wrap line. */
                        while (px >= gd->sx && pywrap < endline) {
                                gl = grid_get_line(gd, pywrap);
                                if (~gl->flags & GRID_LINE_WRAPPED)
                                        break;
                                px -= gd->sx;
                                pywrap++;
                        }
                        /* We have run off the end of the grid. */
                        if (px - padding >= gd->sx)
                                break;

                        grid_get_cell(gd, px, pywrap, &gc);
                        if (gc.flags & GRID_FLAG_TAB)
                                padding += gc.data.width - 1;

                        matched = window_copy_search_compare(gd, px, pywrap,
                            sgd, bx, cis);
                        if (!matched)
                                break;
                }
                if (bx == sgd->sx) {
                        *ppx = ax - 1;
                        return (1);
                }
        }
        return (0);
}

static int
window_copy_search_lr_regex(struct grid *gd, u_int *ppx, u_int *psx, u_int py,
    u_int first, u_int last, regex_t *reg)
{
        int                     eflags = 0;
        u_int                   endline, foundx, foundy, len, pywrap, size = 1;
        char                   *buf;
        regmatch_t              regmatch;
        struct grid_line       *gl;

        /*
         * This can happen during search if the last match was the last
         * character on a line.
         */
        if (first >= last)
                return (0);

        /* Set flags for regex search. */
        if (first != 0)
                eflags |= REG_NOTBOL;

        /* Need to look at the entire string. */
        buf = xmalloc(size);
        buf[0] = '\0';
        buf = window_copy_stringify(gd, py, first, gd->sx, buf, &size);
        len = gd->sx - first;
        endline = gd->hsize + gd->sy - 1;
        pywrap = py;
        while (buf != NULL &&
            pywrap <= endline &&
            len < WINDOW_COPY_SEARCH_MAX_LINE) {
                gl = grid_get_line(gd, pywrap);
                if (~gl->flags & GRID_LINE_WRAPPED)
                        break;
                pywrap++;
                buf = window_copy_stringify(gd, pywrap, 0, gd->sx, buf, &size);
                len += gd->sx;
        }

        if (regexec(reg, buf, 1, &regmatch, eflags) == 0 &&
            regmatch.rm_so != regmatch.rm_eo) {
                foundx = first;
                foundy = py;
                window_copy_cstrtocellpos(gd, len, &foundx, &foundy,
                    buf + regmatch.rm_so);
                if (foundy == py && foundx < last) {
                        *ppx = foundx;
                        len -= foundx - first;
                        window_copy_cstrtocellpos(gd, len, &foundx, &foundy,
                            buf + regmatch.rm_eo);
                        *psx = foundx;
                        while (foundy > py) {
                                *psx += gd->sx;
                                foundy--;
                        }
                        *psx -= *ppx;
                        free(buf);
                        return (1);
                }
        }

        free(buf);
        *ppx = 0;
        *psx = 0;
        return (0);
}

static int
window_copy_search_rl_regex(struct grid *gd, u_int *ppx, u_int *psx, u_int py,
    u_int first, u_int last, regex_t *reg)
{
        int                     eflags = 0;
        u_int                   endline, len, pywrap, size = 1;
        char                   *buf;
        struct grid_line       *gl;

        /* Set flags for regex search. */
        if (first != 0)
                eflags |= REG_NOTBOL;

        /* Need to look at the entire string. */
        buf = xmalloc(size);
        buf[0] = '\0';
        buf = window_copy_stringify(gd, py, first, gd->sx, buf, &size);
        len = gd->sx - first;
        endline = gd->hsize + gd->sy - 1;
        pywrap = py;
        while (buf != NULL &&
            pywrap <= endline &&
            len < WINDOW_COPY_SEARCH_MAX_LINE) {
                gl = grid_get_line(gd, pywrap);
                if (~gl->flags & GRID_LINE_WRAPPED)
                        break;
                pywrap++;
                buf = window_copy_stringify(gd, pywrap, 0, gd->sx, buf, &size);
                len += gd->sx;
        }

        if (window_copy_last_regex(gd, py, first, last, len, ppx, psx, buf,
            reg, eflags))
        {
                free(buf);
                return (1);
        }

        free(buf);
        *ppx = 0;
        *psx = 0;
        return (0);
}

static const char *
window_copy_cellstring(const struct grid_line *gl, u_int px, size_t *size,
    int *allocated)
{
        static struct utf8_data  ud;
        struct grid_cell_entry  *gce;
        char                    *copy;

        if (px >= gl->cellsize) {
                *size = 1;
                *allocated = 0;
                return (" ");
        }

        gce = &gl->celldata[px];
        if (gce->flags & GRID_FLAG_PADDING) {
                *size = 0;
                *allocated = 0;
                return (NULL);
        }
        if (~gce->flags & GRID_FLAG_EXTENDED) {
                *size = 1;
                *allocated = 0;
                return (&gce->data.data);
        }
        if (gce->flags & GRID_FLAG_TAB) {
                *size = 1;
                *allocated = 0;
                return ("\t");
        }

        utf8_to_data(gl->extddata[gce->offset].data, &ud);
        if (ud.size == 0) {
                *size = 0;
                *allocated = 0;
                return (NULL);
        }
        *size = ud.size;
        *allocated = 1;

        copy = xmalloc(ud.size);
        memcpy(copy, ud.data, ud.size);
        return (copy);
}

/* Find last match in given range. */
static int
window_copy_last_regex(struct grid *gd, u_int py, u_int first, u_int last,
    u_int len, u_int *ppx, u_int *psx, const char *buf, const regex_t *preg,
    int eflags)
{
        u_int           foundx, foundy, oldx, px = 0, savepx, savesx = 0;
        regmatch_t      regmatch;

        foundx = first;
        foundy = py;
        oldx = first;
        while (regexec(preg, buf + px, 1, &regmatch, eflags) == 0) {
                if (regmatch.rm_so == regmatch.rm_eo)
                        break;
                window_copy_cstrtocellpos(gd, len, &foundx, &foundy,
                    buf + px + regmatch.rm_so);
                if (foundy > py || foundx >= last)
                        break;
                len -= foundx - oldx;
                savepx = foundx;
                window_copy_cstrtocellpos(gd, len, &foundx, &foundy,
                    buf + px + regmatch.rm_eo);
                if (foundy > py || foundx >= last) {
                        *ppx = savepx;
                        *psx = foundx;
                        while (foundy > py) {
                                *psx += gd->sx;
                                foundy--;
                        }
                        *psx -= *ppx;
                        return (1);
                } else {
                        savesx = foundx - savepx;
                        len -= savesx;
                        oldx = foundx;
                }
                px += regmatch.rm_eo;
        }

        if (savesx > 0) {
                *ppx = savepx;
                *psx = savesx;
                return (1);
        } else {
                *ppx = 0;
                *psx = 0;
                return (0);
        }
}

/* Stringify line and append to input buffer. Caller frees. */
static char *
window_copy_stringify(struct grid *gd, u_int py, u_int first, u_int last,
    char *buf, u_int *size)
{
        u_int                    ax, bx, newsize = *size;
        const struct grid_line  *gl;
        const char              *d;
        size_t                   bufsize = 1024, dlen;
        int                      allocated;

        while (bufsize < newsize)
                bufsize *= 2;
        buf = xrealloc(buf, bufsize);

        gl = grid_peek_line(gd, py);
        if (gl == NULL) {
                buf[*size - 1] = '\0';
                return (buf);
        }
        bx = *size - 1;
        for (ax = first; ax < last; ax++) {
                d = window_copy_cellstring(gl, ax, &dlen, &allocated);
                newsize += dlen;
                while (bufsize < newsize) {
                        bufsize *= 2;
                        buf = xrealloc(buf, bufsize);
                }
                if (dlen == 1)
                        buf[bx++] = *d;
                else {
                        memcpy(buf + bx, d, dlen);
                        bx += dlen;
                }
                if (allocated)
                        free((void *)d);
        }
        buf[newsize - 1] = '\0';

        *size = newsize;
        return (buf);
}

/* Map start of C string containing UTF-8 data to grid cell position. */
static void
window_copy_cstrtocellpos(struct grid *gd, u_int ncells, u_int *ppx, u_int *ppy,
    const char *str)
{
        u_int                    cell, ccell, px, pywrap, pos, len;
        int                      match;
        const struct grid_line  *gl;
        const char              *d;
        size_t                   dlen;
        struct {
                const char      *d;
                size_t           dlen;
                int              allocated;
        } *cells;

        /* Populate the array of cell data. */
        cells = xreallocarray(NULL, ncells, sizeof cells[0]);
        cell = 0;
        px = *ppx;
        pywrap = *ppy;
        gl = grid_peek_line(gd, pywrap);
        if (gl == NULL) {
                free(cells);
                return;
        }
        while (cell < ncells) {
                cells[cell].d = window_copy_cellstring(gl, px,
                    &cells[cell].dlen, &cells[cell].allocated);
                cell++;
                px++;
                if (px == gd->sx) {
                        px = 0;
                        pywrap++;
                        gl = grid_peek_line(gd, pywrap);
                        if (gl == NULL)
                                break;
                }
        }

        /* Locate starting cell. */
        cell = 0;
        len = strlen(str);
        while (cell < ncells) {
                ccell = cell;
                pos = 0;
                match = 1;
                while (ccell < ncells) {
                        if (str[pos] == '\0') {
                                match = 0;
                                break;
                        }
                        d = cells[ccell].d;
                        dlen = cells[ccell].dlen;
                        if (dlen == 1) {
                                if (str[pos] != *d) {
                                        match = 0;
                                        break;
                                }
                                pos++;
                        } else {
                                if (dlen > len - pos)
                                        dlen = len - pos;
                                if (memcmp(str + pos, d, dlen) != 0) {
                                        match = 0;
                                        break;
                                }
                                pos += dlen;
                        }
                        ccell++;
                }
                if (match)
                        break;
                cell++;
        }

        /* If not found this will be one past the end. */
        px = *ppx + cell;
        pywrap = *ppy;
        while (px >= gd->sx) {
                px -= gd->sx;
                pywrap++;
        }

        *ppx = px;
        *ppy = pywrap;

        /* Free cell data. */
        for (cell = 0; cell < ncells; cell++) {
                if (cells[cell].allocated)
                        free((void *)cells[cell].d);
        }
        free(cells);
}

static void
window_copy_move_left(struct screen *s, u_int *fx, u_int *fy, int wrapflag)
{
        if (*fx == 0) { /* left */
                if (*fy == 0) { /* top */
                        if (wrapflag) {
                                *fx = screen_size_x(s) - 1;
                                *fy = screen_hsize(s) + screen_size_y(s) - 1;
                        }
                        return;
                }
                *fx = screen_size_x(s) - 1;
                *fy = *fy - 1;
        } else
                *fx = *fx - 1;
}

static void
window_copy_move_right(struct screen *s, u_int *fx, u_int *fy, int wrapflag)
{
        if (*fx == screen_size_x(s) - 1) { /* right */
                if (*fy == screen_hsize(s) + screen_size_y(s) - 1) { /* bottom */
                        if (wrapflag) {
                                *fx = 0;
                                *fy = 0;
                        }
                        return;
                }
                *fx = 0;
                *fy = *fy + 1;
        } else
                *fx = *fx + 1;
}

static int
window_copy_is_lowercase(const char *ptr)
{
        while (*ptr != '\0') {
                if (*ptr != tolower((u_char)*ptr))
                        return (0);
                ++ptr;
        }
        return (1);
}

/*
 * Handle backward wrapped regex searches with overlapping matches. In this case
 * find the longest overlapping match from previous wrapped lines.
 */
static void
window_copy_search_back_overlap(struct grid *gd, regex_t *preg, u_int *ppx,
    u_int *psx, u_int *ppy, u_int endline)
{
        u_int   endx, endy, oldendx, oldendy, px, py, sx;
        int     found = 1;

        oldendx = *ppx + *psx;
        oldendy = *ppy - 1;
        while (oldendx > gd->sx - 1) {
                oldendx -= gd->sx;
                oldendy++;
        }
        endx = oldendx;
        endy = oldendy;
        px = *ppx;
        py = *ppy;
        while (found && px == 0 && py - 1 > endline &&
               grid_get_line(gd, py - 2)->flags & GRID_LINE_WRAPPED &&
               endx == oldendx && endy == oldendy) {
                py--;
                found = window_copy_search_rl_regex(gd, &px, &sx, py - 1, 0,
                    gd->sx, preg);
                if (found) {
                        endx = px + sx;
                        endy = py - 1;
                        while (endx > gd->sx - 1) {
                                endx -= gd->sx;
                                endy++;
                        }
                        if (endx == oldendx && endy == oldendy) {
                                *ppx = px;
                                *ppy = py;
                        }
                }
        }
}

/*
 * Search for text stored in sgd starting from position fx,fy up to endline. If
 * found, jump to it. If cis then ignore case. The direction is 0 for searching
 * up, down otherwise. If wrap then go to begin/end of grid and try again if
 * not found.
 */
static int
window_copy_search_jump(struct window_mode_entry *wme, struct grid *gd,
    struct grid *sgd, u_int fx, u_int fy, u_int endline, int cis, int wrap,
    int direction, int regex)
{
        u_int    i, px, sx, ssize = 1;
        int      found = 0, cflags = REG_EXTENDED;
        char    *sbuf;
        regex_t  reg;

        if (regex) {
                sbuf = xmalloc(ssize);
                sbuf[0] = '\0';
                sbuf = window_copy_stringify(sgd, 0, 0, sgd->sx, sbuf, &ssize);
                if (cis)
                        cflags |= REG_ICASE;
                if (regcomp(&reg, sbuf, cflags) != 0) {
                        free(sbuf);
                        return (0);
                }
                free(sbuf);
        }

        if (direction) {
                for (i = fy; i <= endline; i++) {
                        if (regex) {
                                found = window_copy_search_lr_regex(gd,
                                    &px, &sx, i, fx, gd->sx, &reg);
                        } else {
                                found = window_copy_search_lr(gd, sgd,
                                    &px, i, fx, gd->sx, cis);
                        }
                        if (found)
                                break;
                        fx = 0;
                }
        } else {
                for (i = fy + 1; endline < i; i--) {
                        if (regex) {
                                found = window_copy_search_rl_regex(gd,
                                    &px, &sx, i - 1, 0, fx + 1, &reg);
                                if (found) {
                                        window_copy_search_back_overlap(gd,
                                            &reg, &px, &sx, &i, endline);
                                }
                        } else {
                                found = window_copy_search_rl(gd, sgd,
                                    &px, i - 1, 0, fx + 1, cis);
                        }
                        if (found) {
                                i--;
                                break;
                        }
                        fx = gd->sx - 1;
                }
        }
        if (regex)
                regfree(&reg);

        if (found) {
                window_copy_scroll_to(wme, px, i, 1);
                return (1);
        }
        if (wrap) {
                return (window_copy_search_jump(wme, gd, sgd,
                    direction ? 0 : gd->sx - 1,
                    direction ? 0 : gd->hsize + gd->sy - 1, fy, cis, 0,
                    direction, regex));
        }
        return (0);
}

static void
window_copy_move_after_search_mark(struct window_copy_mode_data *data,
    u_int *fx, u_int *fy, int wrapflag)
{
        struct screen  *s = data->backing;
        u_int           at, start;

        if (window_copy_search_mark_at(data, *fx, *fy, &start) == 0 &&
            data->searchmark[start] != 0) {
                while (window_copy_search_mark_at(data, *fx, *fy, &at) == 0) {
                        if (data->searchmark[at] != data->searchmark[start])
                                break;
                        /* Stop if not wrapping and at the end of the grid. */
                        if (!wrapflag &&
                            *fx == screen_size_x(s) - 1 &&
                            *fy == screen_hsize(s) + screen_size_y(s) - 1)
                                break;

                        window_copy_move_right(s, fx, fy, wrapflag);
                }
        }
}

/*
 * Search in for text searchstr. If direction is 0 then search up, otherwise
 * down.
 */
static int
window_copy_search(struct window_mode_entry *wme, int direction, int regex)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = data->backing, ss;
        struct screen_write_ctx          ctx;
        struct grid                     *gd = s->grid;
        const char                      *str = data->searchstr;
        u_int                            at, endline, fx, fy, start, ssx;
        int                              cis, found, keys, visible_only;
        int                              wrapflag;

        if (regex && str[strcspn(str, "^$*+()?[].\\")] == '\0')
                regex = 0;

        data->searchdirection = direction;

        if (data->timeout)
                return (0);

        if (data->searchall || wp->searchstr == NULL ||
            wp->searchregex != regex) {
                visible_only = 0;
                data->searchall = 0;
        } else
                visible_only = (strcmp(wp->searchstr, str) == 0);
        if (visible_only == 0 && data->searchmark != NULL)
                window_copy_clear_marks(wme);
        free(wp->searchstr);
        wp->searchstr = xstrdup(str);
        wp->searchregex = regex;

        fx = data->cx;
        fy = screen_hsize(data->backing) - data->oy + data->cy;

        if ((ssx = screen_write_strlen("%s", str)) == 0)
                return (0);
        screen_init(&ss, ssx, 1, 0);
        screen_write_start(&ctx, &ss);
        screen_write_nputs(&ctx, -1, &grid_default_cell, "%s", str);
        screen_write_stop(&ctx);

        wrapflag = options_get_number(wp->window->options, "wrap-search");
        cis = window_copy_is_lowercase(str);

        keys = options_get_number(wp->window->options, "mode-keys");

        if (direction) {
                /*
                 * Behave according to mode-keys. If it is emacs, search forward
                 * leaves the cursor after the match. If it is vi, the cursor
                 * remains at the beginning of the match, regardless of
                 * direction, which means that we need to start the next search
                 * after the term the cursor is currently on when searching
                 * forward.
                 */
                if (keys == MODEKEY_VI) {
                        if (data->searchmark != NULL)
                                window_copy_move_after_search_mark(data, &fx,
                                    &fy, wrapflag);
                        else {
                                /*
                                 * When there are no search marks, start the
                                 * search after the current cursor position.
                                 */
                                window_copy_move_right(s, &fx, &fy, wrapflag);
                        }
                }
                endline = gd->hsize + gd->sy - 1;
        } else {
                window_copy_move_left(s, &fx, &fy, wrapflag);
                endline = 0;
        }

        found = window_copy_search_jump(wme, gd, ss.grid, fx, fy, endline, cis,
            wrapflag, direction, regex);
        if (found) {
                window_copy_search_marks(wme, &ss, regex, visible_only);
                fx = data->cx;
                fy = screen_hsize(data->backing) - data->oy + data->cy;

                /*
                 * When searching forward, if the cursor is not at the beginning
                 * of the mark, search again.
                 */
                if (direction &&
                    window_copy_search_mark_at(data, fx, fy, &at) == 0 &&
                    at > 0 &&
                    data->searchmark != NULL &&
                    data->searchmark[at] == data->searchmark[at - 1]) {
                        window_copy_move_after_search_mark(data, &fx, &fy,
                            wrapflag);
                        window_copy_search_jump(wme, gd, ss.grid, fx,
                            fy, endline, cis, wrapflag, direction,
                            regex);
                        fx = data->cx;
                        fy = screen_hsize(data->backing) - data->oy + data->cy;
                }

                if (direction) {
                        /*
                         * When in Emacs mode, position the cursor just after
                         * the mark.
                         */
                        if (keys == MODEKEY_EMACS) {
                                window_copy_move_after_search_mark(data, &fx,
                                    &fy, wrapflag);
                                data->cx = fx;
                                data->cy = fy - screen_hsize(data->backing) +
                                    data-> oy;
                        }
                } else {
                        /*
                         * When searching backward, position the cursor at the
                         * beginning of the mark.
                         */
                        if (window_copy_search_mark_at(data, fx, fy,
                                &start) == 0) {
                                while (window_copy_search_mark_at(data, fx, fy,
                                           &at) == 0 &&
                                       data->searchmark != NULL &&
                                       data->searchmark[at] ==
                                           data->searchmark[start]) {
                                        data->cx = fx;
                                        data->cy = fy -
                                            screen_hsize(data->backing) +
                                            data-> oy;
                                        if (at == 0)
                                                break;

                                        window_copy_move_left(s, &fx, &fy, 0);
                                }
                        }
                }
        }
        window_copy_redraw_screen(wme);

        screen_free(&ss);
        return (found);
}

static void
window_copy_visible_lines(struct window_copy_mode_data *data, u_int *start,
    u_int *end)
{
        struct grid             *gd = data->backing->grid;
        const struct grid_line  *gl;

        for (*start = gd->hsize - data->oy; *start > 0; (*start)--) {
                gl = grid_peek_line(gd, (*start) - 1);
                if (gl == NULL || ~gl->flags & GRID_LINE_WRAPPED)
                        break;
        }
        *end = gd->hsize - data->oy + gd->sy;
}

static int
window_copy_search_mark_at(struct window_copy_mode_data *data, u_int px,
    u_int py, u_int *at)
{
        struct screen   *s = data->backing;
        struct grid     *gd = s->grid;

        if (py < gd->hsize - data->oy)
                return (-1);
        if (py > gd->hsize - data->oy + gd->sy - 1)
                return (-1);
        *at = ((py - (gd->hsize - data->oy)) * gd->sx) + px;
        return (0);
}

static u_int
window_copy_clip_width(u_int width, u_int b, u_int sx, u_int sy)
{
        return ((b + width > sx * sy) ? (sx * sy) - b : width);
}

static u_int
window_copy_search_mark_match(struct window_copy_mode_data *data, u_int px,
    u_int py, u_int width, int regex)
{
        struct grid             *gd = data->backing->grid;
        struct grid_cell         gc;
        u_int                    i, b, w = width, sx = gd->sx, sy = gd->sy;

        if (window_copy_search_mark_at(data, px, py, &b) == 0) {
                width = window_copy_clip_width(width, b, sx, sy);
                w = width;
                for (i = b; i < b + w; i++) {
                        if (!regex) {
                                grid_get_cell(gd, px + (i - b), py, &gc);
                                if (gc.flags & GRID_FLAG_TAB)
                                        w += gc.data.width - 1;
                                w = window_copy_clip_width(w, b, sx, sy);
                        }
                        if (data->searchmark[i] != 0)
                                continue;
                        data->searchmark[i] = data->searchgen;
                }
                if (data->searchgen == UCHAR_MAX)
                        data->searchgen = 1;
                else
                        data->searchgen++;
        }

        return (w);
}

static int
window_copy_search_marks(struct window_mode_entry *wme, struct screen *ssp,
    int regex, int visible_only)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = data->backing, ss;
        struct screen_write_ctx          ctx;
        struct grid                     *gd = s->grid;
        struct grid_cell                 gc;
        int                              found, cis, stopped = 0;
        int                              cflags = REG_EXTENDED;
        u_int                            px, py, nfound = 0, width;
        u_int                            ssize = 1, start, end, sx = gd->sx;
        u_int                            sy = gd->sy;
        char                            *sbuf;
        regex_t                          reg;
        uint64_t                         stop = 0, tstart, t;

        if (ssp == NULL) {
                width = screen_write_strlen("%s", data->searchstr);
                screen_init(&ss, width, 1, 0);
                screen_write_start(&ctx, &ss);
                screen_write_nputs(&ctx, -1, &grid_default_cell, "%s",
                    data->searchstr);
                screen_write_stop(&ctx);
                ssp = &ss;
        } else
                width = screen_size_x(ssp);

        cis = window_copy_is_lowercase(data->searchstr);

        if (regex) {
                sbuf = xmalloc(ssize);
                sbuf[0] = '\0';
                sbuf = window_copy_stringify(ssp->grid, 0, 0, ssp->grid->sx,
                    sbuf, &ssize);
                if (cis)
                        cflags |= REG_ICASE;
                if (regcomp(&reg, sbuf, cflags) != 0) {
                        free(sbuf);
                        return (0);
                }
                free(sbuf);
        }
        tstart = get_timer();

        if (visible_only)
                window_copy_visible_lines(data, &start, &end);
        else {
                start = 0;
                end = gd->hsize + sy;
                stop = get_timer() + WINDOW_COPY_SEARCH_ALL_TIMEOUT;
        }

again:
        free(data->searchmark);
        data->searchmark = xcalloc(sx, sy);
        data->searchgen = 1;

        for (py = start; py < end; py++) {
                px = 0;
                for (;;) {
                        if (regex) {
                                found = window_copy_search_lr_regex(gd,
                                    &px, &width, py, px, sx, &reg);
                                grid_get_cell(gd, px + width - 1, py, &gc);
                                if (gc.data.width > 2)
                                        width += gc.data.width - 1;
                                if (!found)
                                        break;
                        } else {
                                found = window_copy_search_lr(gd, ssp->grid,
                                    &px, py, px, sx, cis);
                                if (!found)
                                        break;
                        }
                        nfound++;
                        px += window_copy_search_mark_match(data, px, py, width,
                            regex);
                }

                t = get_timer();
                if (t - tstart > WINDOW_COPY_SEARCH_TIMEOUT) {
                        data->timeout = 1;
                        break;
                }
                if (stop != 0 && t > stop) {
                        stopped = 1;
                        break;
                }
        }
        if (data->timeout) {
                window_copy_clear_marks(wme);
                goto out;
        }

        if (stopped && stop != 0) {
                /* Try again but just the visible context. */
                window_copy_visible_lines(data, &start, &end);
                stop = 0;
                goto again;
        }

        if (!visible_only) {
                if (stopped) {
                        if (nfound > 1000)
                                data->searchcount = 1000;
                        else if (nfound > 100)
                                data->searchcount = 100;
                        else if (nfound > 10)
                                data->searchcount = 10;
                        else
                                data->searchcount = -1;
                        data->searchmore = 1;
                } else {
                        data->searchcount = nfound;
                        data->searchmore = 0;
                }
        }

out:
        if (ssp == &ss)
                screen_free(&ss);
        if (regex)
                regfree(&reg);
        return (1);
}

static void
window_copy_clear_marks(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;

        data->searchcount = -1;
        data->searchmore = 0;

        free(data->searchmark);
        data->searchmark = NULL;
}

static int
window_copy_search_up(struct window_mode_entry *wme, int regex)
{
        return (window_copy_search(wme, 0, regex));
}

static int
window_copy_search_down(struct window_mode_entry *wme, int regex)
{
        return (window_copy_search(wme, 1, regex));
}

static void
window_copy_goto_line(struct window_mode_entry *wme, const char *linestr)
{
        struct window_copy_mode_data    *data = wme->data;
        const char                      *errstr;
        int                              lineno;

        lineno = strtonum(linestr, -1, INT_MAX, &errstr);
        if (errstr != NULL)
                return;
        if (lineno < 0 || (u_int)lineno > screen_hsize(data->backing))
                lineno = screen_hsize(data->backing);

        data->oy = lineno;
        window_copy_update_selection(wme, 1, 0);
        window_copy_redraw_screen(wme);
}

static void
window_copy_match_start_end(struct window_copy_mode_data *data, u_int at,
    u_int *start, u_int *end)
{
        struct grid     *gd = data->backing->grid;
        u_int            last = (gd->sy * gd->sx) - 1;
        u_char           mark = data->searchmark[at];

        *start = *end = at;
        while (*start != 0 && data->searchmark[*start] == mark)
                (*start)--;
        if (data->searchmark[*start] != mark)
                (*start)++;
        while (*end != last && data->searchmark[*end] == mark)
                (*end)++;
        if (data->searchmark[*end] != mark)
                (*end)--;
}

static char *
window_copy_match_at_cursor(struct window_copy_mode_data *data)
{
        struct grid     *gd = data->backing->grid;
        struct grid_cell gc;
        u_int            at, start, end, cy, px, py;
        u_int            sx = screen_size_x(data->backing);
        char            *buf = NULL;
        size_t           len = 0;

        if (data->searchmark == NULL)
                return (NULL);

        cy = screen_hsize(data->backing) - data->oy + data->cy;
        if (window_copy_search_mark_at(data, data->cx, cy, &at) != 0)
                return (NULL);
        if (data->searchmark[at] == 0) {
                /* Allow one position after the match. */
                if (at == 0 || data->searchmark[--at] == 0)
                        return (NULL);
        }
        window_copy_match_start_end(data, at, &start, &end);

        /*
         * Cells will not be set in the marked array unless they are valid text
         * and wrapping will be taken care of, so we can just copy.
         */
        for (at = start; at <= end; at++) {
                py = at / sx;
                px = at - (py * sx);

                grid_get_cell(gd, px, gd->hsize + py - data->oy, &gc);
                if (gc.flags & GRID_FLAG_TAB) {
                        buf = xrealloc(buf, len + 2);
                        buf[len] = '\t';
                        len++;
                } else if (gc.flags & GRID_FLAG_PADDING) {
                        /* nothing to do */
                } else {
                        buf = xrealloc(buf, len + gc.data.size + 1);
                        memcpy(buf + len, gc.data.data, gc.data.size);
                        len += gc.data.size;
                }
        }
        if (len != 0)
                buf[len] = '\0';
        return (buf);
}

static void
window_copy_update_style(struct window_mode_entry *wme, u_int fx, u_int fy,
    struct grid_cell *gc, const struct grid_cell *mgc,
    const struct grid_cell *cgc, const struct grid_cell *mkgc)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        u_int                            mark, start, end, cy, cursor, current;
        int                              inv = 0, found = 0;
        int                              keys;

        if (data->showmark && fy == data->my) {
                gc->attr = mkgc->attr;
                if (fx == data->mx)
                        inv = 1;
                if (inv) {
                        gc->fg = mkgc->bg;
                        gc->bg = mkgc->fg;
                }
                else {
                        gc->fg = mkgc->fg;
                        gc->bg = mkgc->bg;
                }
        }

        if (data->searchmark == NULL)
                return;

        if (window_copy_search_mark_at(data, fx, fy, &current) != 0)
                return;
        mark = data->searchmark[current];
        if (mark == 0)
                return;

        cy = screen_hsize(data->backing) - data->oy + data->cy;
        if (window_copy_search_mark_at(data, data->cx, cy, &cursor) == 0) {
                keys = options_get_number(wp->window->options, "mode-keys");
                if (cursor != 0 &&
                    keys == MODEKEY_EMACS &&
                    data->searchdirection) {
                        if (data->searchmark[cursor - 1] == mark) {
                                cursor--;
                                found = 1;
                        }
                } else if (data->searchmark[cursor] == mark)
                        found = 1;
                if (found) {
                        window_copy_match_start_end(data, cursor, &start, &end);
                        if (current >= start && current <= end) {
                                gc->attr = cgc->attr;
                                if (inv) {
                                        gc->fg = cgc->bg;
                                        gc->bg = cgc->fg;
                                }
                                else {
                                        gc->fg = cgc->fg;
                                        gc->bg = cgc->bg;
                                }
                                return;
                        }
                }
        }

        gc->attr = mgc->attr;
        if (inv) {
                gc->fg = mgc->bg;
                gc->bg = mgc->fg;
        }
        else {
                gc->fg = mgc->fg;
                gc->bg = mgc->bg;
        }
}

static void
window_copy_write_one(struct window_mode_entry *wme,
    struct screen_write_ctx *ctx, u_int py, u_int fy, u_int nx,
    const struct grid_cell *mgc, const struct grid_cell *cgc,
    const struct grid_cell *mkgc)
{
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->backing->grid;
        struct grid_cell                 gc;
        u_int                            fx;

        screen_write_cursormove(ctx, 0, py, 0);
        for (fx = 0; fx < nx; fx++) {
                grid_get_cell(gd, fx, fy, &gc);
                if (fx + gc.data.width <= nx) {
                        window_copy_update_style(wme, fx, fy, &gc, mgc, cgc,
                            mkgc);
                        screen_write_cell(ctx, &gc);
                }
        }
}

int
window_copy_get_current_offset(struct window_pane *wp, u_int *offset,
    u_int *size)
{
        struct window_mode_entry        *wme = TAILQ_FIRST(&wp->modes);
        struct window_copy_mode_data    *data = wme->data;
        u_int                            hsize;

        if (data == NULL)
                return (0);
        hsize = screen_hsize(data->backing);

        *offset = hsize - data->oy;
        *size = hsize;
        return (1);
}

static void
window_copy_write_line(struct window_mode_entry *wme,
    struct screen_write_ctx *ctx, u_int py)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        struct options                  *oo = wp->window->options;
        struct grid_cell                 gc, mgc, cgc, mkgc;
        u_int                            sx = screen_size_x(s);
        u_int                            hsize = screen_hsize(data->backing);
        const char                      *value;
        char                            *expanded;
        struct format_tree              *ft;

        ft = format_create_defaults(NULL, NULL, NULL, NULL, wp);

        style_apply(&gc, oo, "copy-mode-position-style", ft);
        gc.flags |= GRID_FLAG_NOPALETTE;
        style_apply(&mgc, oo, "copy-mode-match-style", ft);
        mgc.flags |= GRID_FLAG_NOPALETTE;
        style_apply(&cgc, oo, "copy-mode-current-match-style", ft);
        cgc.flags |= GRID_FLAG_NOPALETTE;
        style_apply(&mkgc, oo, "copy-mode-mark-style", ft);
        mkgc.flags |= GRID_FLAG_NOPALETTE;

        window_copy_write_one(wme, ctx, py, hsize - data->oy + py,
            screen_size_x(s), &mgc, &cgc, &mkgc);

        if (py == 0 && s->rupper < s->rlower && !data->hide_position) {
                value = options_get_string(oo, "copy-mode-position-format");
                if (*value != '\0') {
                        expanded = format_expand(ft, value);
                        if (*expanded != '\0') {
                                screen_write_cursormove(ctx, 0, 0, 0);
                                format_draw(ctx, &gc, sx, expanded, NULL, 0);
                        }
                        free(expanded);
                }
        }

        if (py == data->cy && data->cx == screen_size_x(s)) {
                screen_write_cursormove(ctx, screen_size_x(s) - 1, py, 0);
                screen_write_putc(ctx, &grid_default_cell, '$');
        }

        format_free(ft);
}

static void
window_copy_write_lines(struct window_mode_entry *wme,
    struct screen_write_ctx *ctx, u_int py, u_int ny)
{
        u_int   yy;

        for (yy = py; yy < py + ny; yy++)
                window_copy_write_line(wme, ctx, py);
}

static void
window_copy_redraw_selection(struct window_mode_entry *wme, u_int old_y)
{
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->backing->grid;
        u_int                            new_y, start, end;

        new_y = data->cy;
        if (old_y <= new_y) {
                start = old_y;
                end = new_y;
        } else {
                start = new_y;
                end = old_y;
        }

        /*
         * In word selection mode the first word on the line below the cursor
         * might be selected, so add this line to the redraw area.
         */
        if (data->selflag == SEL_WORD) {
                /* Last grid line in data coordinates. */
                if (end < gd->sy + data->oy - 1)
                        end++;
        }
        window_copy_redraw_lines(wme, start, end - start + 1);
}

static void
window_copy_redraw_lines(struct window_mode_entry *wme, u_int py, u_int ny)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen_write_ctx          ctx;
        u_int                            i;

        screen_write_start_pane(&ctx, wp, NULL);
        for (i = py; i < py + ny; i++)
                window_copy_write_line(wme, &ctx, i);
        screen_write_cursormove(&ctx, data->cx, data->cy, 0);
        screen_write_stop(&ctx);

        wp->flags |= PANE_REDRAWSCROLLBAR;
}

static void
window_copy_redraw_screen(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;

        window_copy_redraw_lines(wme, 0, screen_size_y(&data->screen));
}

static void
window_copy_style_changed(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;

        if (data->screen.sel != NULL)
                window_copy_set_selection(wme, 0, 1);
        window_copy_redraw_screen(wme);
}

static void
window_copy_synchronize_cursor_end(struct window_mode_entry *wme, int begin,
    int no_reset)
{
        struct window_copy_mode_data    *data = wme->data;
        u_int                            xx, yy;

        xx = data->cx;
        yy = screen_hsize(data->backing) + data->cy - data->oy;
        switch (data->selflag) {
        case SEL_WORD:
                if (no_reset)
                        break;
                begin = 0;
                if (data->dy > yy || (data->dy == yy && data->dx > xx)) {
                        /* Right to left selection. */
                        window_copy_cursor_previous_word_pos(wme,
                            data->separators, &xx, &yy);
                        begin = 1;

                        /* Reset the end. */
                        data->endselx = data->endselrx;
                        data->endsely = data->endselry;
                } else {
                        /* Left to right selection. */
                        if (xx >= window_copy_find_length(wme, yy) ||
                            !window_copy_in_set(wme, xx + 1, yy, WHITESPACE)) {
                                window_copy_cursor_next_word_end_pos(wme,
                                    data->separators, &xx, &yy);
                        }

                        /* Reset the start. */
                        data->selx = data->selrx;
                        data->sely = data->selry;
                }
                break;
        case SEL_LINE:
                if (no_reset)
                        break;
                begin = 0;
                if (data->dy > yy) {
                        /* Right to left selection. */
                        xx = 0;
                        begin = 1;

                        /* Reset the end. */
                        data->endselx = data->endselrx;
                        data->endsely = data->endselry;
                } else {
                        /* Left to right selection. */
                        if (yy < data->endselry)
                                yy = data->endselry;
                        xx = window_copy_find_length(wme, yy);

                        /* Reset the start. */
                        data->selx = data->selrx;
                        data->sely = data->selry;
                }
                break;
        case SEL_CHAR:
                break;
        }
        if (begin) {
                data->selx = xx;
                data->sely = yy;
        } else {
                data->endselx = xx;
                data->endsely = yy;
        }
}

static void
window_copy_synchronize_cursor(struct window_mode_entry *wme, int no_reset)
{
        struct window_copy_mode_data    *data = wme->data;

        switch (data->cursordrag) {
        case CURSORDRAG_ENDSEL:
                window_copy_synchronize_cursor_end(wme, 0, no_reset);
                break;
        case CURSORDRAG_SEL:
                window_copy_synchronize_cursor_end(wme, 1, no_reset);
                break;
        case CURSORDRAG_NONE:
                break;
        }
}

static void
window_copy_update_cursor(struct window_mode_entry *wme, u_int cx, u_int cy)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        struct screen_write_ctx          ctx;
        u_int                            old_cx, old_cy;

        old_cx = data->cx; old_cy = data->cy;
        data->cx = cx; data->cy = cy;
        if (old_cx == screen_size_x(s))
                window_copy_redraw_lines(wme, old_cy, 1);
        if (data->cx == screen_size_x(s))
                window_copy_redraw_lines(wme, data->cy, 1);
        else {
                screen_write_start_pane(&ctx, wp, NULL);
                screen_write_cursormove(&ctx, data->cx, data->cy, 0);
                screen_write_stop(&ctx);
        }
}

static void
window_copy_start_selection(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;

        data->selx = data->cx;
        data->sely = screen_hsize(data->backing) + data->cy - data->oy;

        data->endselx = data->selx;
        data->endsely = data->sely;

        data->cursordrag = CURSORDRAG_ENDSEL;

        window_copy_set_selection(wme, 1, 0);
}

static int
window_copy_adjust_selection(struct window_mode_entry *wme, u_int *selx,
    u_int *sely)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        u_int                            sx, sy, ty;
        int                              relpos;

        sx = *selx;
        sy = *sely;

        ty = screen_hsize(data->backing) - data->oy;
        if (sy < ty) {
                relpos = WINDOW_COPY_REL_POS_ABOVE;
                if (!data->rectflag)
                        sx = 0;
                sy = 0;
        } else if (sy > ty + screen_size_y(s) - 1) {
                relpos = WINDOW_COPY_REL_POS_BELOW;
                if (!data->rectflag)
                        sx = screen_size_x(s) - 1;
                sy = screen_size_y(s) - 1;
        } else {
                relpos = WINDOW_COPY_REL_POS_ON_SCREEN;
                sy -= ty;
        }

        *selx = sx;
        *sely = sy;
        return (relpos);
}

static int
window_copy_update_selection(struct window_mode_entry *wme, int may_redraw,
    int no_reset)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;

        if (s->sel == NULL && data->lineflag == LINE_SEL_NONE)
                return (0);
        return (window_copy_set_selection(wme, may_redraw, no_reset));
}

static int
window_copy_set_selection(struct window_mode_entry *wme, int may_redraw,
    int no_reset)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        struct options                  *oo = wp->window->options;
        struct grid_cell                 gc;
        u_int                            sx, sy, cy, endsx, endsy;
        int                              startrelpos, endrelpos;
        struct format_tree              *ft;

        window_copy_synchronize_cursor(wme, no_reset);

        /* Adjust the selection. */
        sx = data->selx;
        sy = data->sely;
        startrelpos = window_copy_adjust_selection(wme, &sx, &sy);

        /* Adjust the end of selection. */
        endsx = data->endselx;
        endsy = data->endsely;
        endrelpos = window_copy_adjust_selection(wme, &endsx, &endsy);

        /* Selection is outside of the current screen */
        if (startrelpos == endrelpos &&
            startrelpos != WINDOW_COPY_REL_POS_ON_SCREEN) {
                screen_hide_selection(s);
                return (0);
        }

        /* Set colours and selection. */
        ft = format_create_defaults(NULL, NULL, NULL, NULL, wp);
        style_apply(&gc, oo, "copy-mode-selection-style", ft);
        gc.flags |= GRID_FLAG_NOPALETTE;
        format_free(ft);
        screen_set_selection(s, sx, sy, endsx, endsy, data->rectflag,
            data->modekeys, &gc);

        if (data->rectflag && may_redraw) {
                /*
                 * Can't rely on the caller to redraw the right lines for
                 * rectangle selection - find the highest line and the number
                 * of lines, and redraw just past that in both directions
                 */
                cy = data->cy;
                if (data->cursordrag == CURSORDRAG_ENDSEL) {
                        if (sy < cy)
                                window_copy_redraw_lines(wme, sy, cy - sy + 1);
                        else
                                window_copy_redraw_lines(wme, cy, sy - cy + 1);
                } else {
                        if (endsy < cy) {
                                window_copy_redraw_lines(wme, endsy,
                                    cy - endsy + 1);
                        } else {
                                window_copy_redraw_lines(wme, cy,
                                    endsy - cy + 1);
                        }
                }
        }

        return (1);
}

static void *
window_copy_get_selection(struct window_mode_entry *wme, size_t *len)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        char                            *buf;
        size_t                           off;
        u_int                            i, xx, yy, sx, sy, ex, ey, ey_last;
        u_int                            firstsx, lastex, restex, restsx, selx;
        int                              keys;

        if (data->screen.sel == NULL && data->lineflag == LINE_SEL_NONE) {
                buf = window_copy_match_at_cursor(data);
                if (buf != NULL)
                        *len = strlen(buf);
                else
                        *len = 0;
                return (buf);
        }

        buf = xmalloc(1);
        off = 0;

        *buf = '\0';

        /*
         * The selection extends from selx,sely to (adjusted) cx,cy on
         * the base screen.
         */

        /* Find start and end. */
        xx = data->endselx;
        yy = data->endsely;
        if (yy < data->sely || (yy == data->sely && xx < data->selx)) {
                sx = xx; sy = yy;
                ex = data->selx; ey = data->sely;
        } else {
                sx = data->selx; sy = data->sely;
                ex = xx; ey = yy;
        }

        /* Trim ex to end of line. */
        ey_last = window_copy_find_length(wme, ey);
        if (ex > ey_last)
                ex = ey_last;

        /*
         * Deal with rectangle-copy if necessary; four situations: start of
         * first line (firstsx), end of last line (lastex), start (restsx) and
         * end (restex) of all other lines.
         */
        xx = screen_size_x(s);

        /*
         * Behave according to mode-keys. If it is emacs, copy like emacs,
         * keeping the top-left-most character, and dropping the
         * bottom-right-most, regardless of copy direction. If it is vi, also
         * keep bottom-right-most character.
         */
        keys = options_get_number(wp->window->options, "mode-keys");
        if (data->rectflag) {
                /*
                 * Need to ignore the column with the cursor in it, which for
                 * rectangular copy means knowing which side the cursor is on.
                 */
                if (data->cursordrag == CURSORDRAG_ENDSEL)
                        selx = data->selx;
                else
                        selx = data->endselx;
                if (selx < data->cx) {
                        /* Selection start is on the left. */
                        if (keys == MODEKEY_EMACS) {
                                lastex = data->cx;
                                restex = data->cx;
                        }
                        else {
                                lastex = data->cx + 1;
                                restex = data->cx + 1;
                        }
                        firstsx = selx;
                        restsx = selx;
                } else {
                        /* Cursor is on the left. */
                        lastex = selx + 1;
                        restex = selx + 1;
                        firstsx = data->cx;
                        restsx = data->cx;
                }
        } else {
                if (keys == MODEKEY_EMACS)
                        lastex = ex;
                else
                        lastex = ex + 1;
                restex = xx;
                firstsx = sx;
                restsx = 0;
        }

        /* Copy the lines. */
        for (i = sy; i <= ey; i++) {
                window_copy_copy_line(wme, &buf, &off, i,
                    (i == sy ? firstsx : restsx),
                    (i == ey ? lastex : restex));
        }

        /* Don't bother if no data. */
        if (off == 0) {
                free(buf);
                *len = 0;
                return (NULL);
        }
         /* Remove final \n (unless at end in vi mode). */
        if (keys == MODEKEY_EMACS || lastex <= ey_last) {
                if (~grid_get_line(data->backing->grid, ey)->flags &
                    GRID_LINE_WRAPPED || lastex != ey_last)
                        off -= 1;
        }
        *len = off;
        return (buf);
}

static void
window_copy_copy_buffer(struct window_mode_entry *wme, const char *prefix,
    void *buf, size_t len, int set_paste, int set_clip)
{
        struct window_pane      *wp = wme->wp;
        struct screen_write_ctx  ctx;

        if (set_clip &&
            options_get_number(global_options, "set-clipboard") != 0) {
                screen_write_start_pane(&ctx, wp, NULL);
                screen_write_setselection(&ctx, "", buf, len);
                screen_write_stop(&ctx);
                notify_pane("pane-set-clipboard", wp);
        }

        if (set_paste)
                paste_add(prefix, buf, len);
        else
                free(buf);
}

static void *
window_copy_pipe_run(struct window_mode_entry *wme, struct session *s,
    const char *cmd, size_t *len)
{
        void            *buf;
        struct job      *job;

        buf = window_copy_get_selection(wme, len);
        if (cmd == NULL || *cmd == '\0')
                cmd = options_get_string(global_options, "copy-command");
        if (cmd != NULL && *cmd != '\0') {
                job = job_run(cmd, 0, NULL, NULL, s, NULL, NULL, NULL, NULL,
                    NULL, JOB_NOWAIT, -1, -1);
                bufferevent_write(job_get_event(job), buf, *len);
        }
        return (buf);
}

static void
window_copy_pipe(struct window_mode_entry *wme, struct session *s,
    const char *cmd)
{
        void    *buf;
        size_t  len;

        buf = window_copy_pipe_run(wme, s, cmd, &len);
        free (buf);
}

static void
window_copy_copy_pipe(struct window_mode_entry *wme, struct session *s,
    const char *prefix, const char *cmd, int set_paste, int set_clip)
{
        void    *buf;
        size_t   len;

        buf = window_copy_pipe_run(wme, s, cmd, &len);
        if (buf != NULL) {
                window_copy_copy_buffer(wme, prefix, buf, len, set_paste,
                    set_clip);
        }
}

static void
window_copy_copy_selection(struct window_mode_entry *wme, const char *prefix,
    int set_paste, int set_clip)
{
        char    *buf;
        size_t   len;

        buf = window_copy_get_selection(wme, &len);
        if (buf != NULL) {
                window_copy_copy_buffer(wme, prefix, buf, len, set_paste,
                    set_clip);
        }
}

static void
window_copy_append_selection(struct window_mode_entry *wme)
{
        struct window_pane              *wp = wme->wp;
        char                            *buf, *bufname = NULL;
        struct paste_buffer             *pb;
        const char                      *bufdata;
        size_t                           len, bufsize;
        struct screen_write_ctx          ctx;

        buf = window_copy_get_selection(wme, &len);
        if (buf == NULL)
                return;

        if (options_get_number(global_options, "set-clipboard") != 0) {
                screen_write_start_pane(&ctx, wp, NULL);
                screen_write_setselection(&ctx, "", buf, len);
                screen_write_stop(&ctx);
                notify_pane("pane-set-clipboard", wp);
        }

        pb = paste_get_top(&bufname);
        if (pb != NULL) {
                bufdata = paste_buffer_data(pb, &bufsize);
                buf = xrealloc(buf, len + bufsize);
                memmove(buf + bufsize, buf, len);
                memcpy(buf, bufdata, bufsize);
                len += bufsize;
        }
        if (paste_set(buf, len, bufname, NULL) != 0)
                free(buf);
        free(bufname);
}

static void
window_copy_copy_line(struct window_mode_entry *wme, char **buf, size_t *off,
    u_int sy, u_int sx, u_int ex)
{
        struct window_copy_mode_data    *data = wme->data;
        struct grid                     *gd = data->backing->grid;
        struct grid_cell                 gc;
        struct grid_line                *gl;
        struct utf8_data                 ud;
        u_int                            i, xx, wrapped = 0;
        const char                      *s;

        if (sx > ex)
                return;

        /*
         * Work out if the line was wrapped at the screen edge and all of it is
         * on screen.
         */
        gl = grid_get_line(gd, sy);
        if (gl->flags & GRID_LINE_WRAPPED && gl->cellsize <= gd->sx)
                wrapped = 1;

        /* If the line was wrapped, don't strip spaces (use the full length). */
        if (wrapped)
                xx = gl->cellsize;
        else
                xx = window_copy_find_length(wme, sy);
        if (ex > xx)
                ex = xx;
        if (sx > xx)
                sx = xx;

        if (sx < ex) {
                for (i = sx; i < ex; i++) {
                        grid_get_cell(gd, i, sy, &gc);
                        if (gc.flags & GRID_FLAG_PADDING)
                                continue;
                        if (gc.flags & GRID_FLAG_TAB)
                                utf8_set(&ud, '\t');
                        else
                                utf8_copy(&ud, &gc.data);
                        if (ud.size == 1 && (gc.attr & GRID_ATTR_CHARSET)) {
                                s = tty_acs_get(NULL, ud.data[0]);
                                if (s != NULL && strlen(s) <= sizeof ud.data) {
                                        ud.size = strlen(s);
                                        memcpy(ud.data, s, ud.size);
                                }
                        }

                        *buf = xrealloc(*buf, (*off) + ud.size);
                        memcpy(*buf + *off, ud.data, ud.size);
                        *off += ud.size;
                }
        }

        /* Only add a newline if the line wasn't wrapped. */
        if (!wrapped || ex != xx) {
                *buf = xrealloc(*buf, (*off) + 1);
                (*buf)[(*off)++] = '\n';
        }
}

static void
window_copy_clear_selection(struct window_mode_entry *wme)
{
        struct window_copy_mode_data   *data = wme->data;
        u_int                           px, py;

        screen_clear_selection(&data->screen);

        data->cursordrag = CURSORDRAG_NONE;
        data->lineflag = LINE_SEL_NONE;
        data->selflag = SEL_CHAR;

        py = screen_hsize(data->backing) + data->cy - data->oy;
        px = window_copy_find_length(wme, py);
        if (data->cx > px)
                window_copy_update_cursor(wme, px, data->cy);
}

static int
window_copy_in_set(struct window_mode_entry *wme, u_int px, u_int py,
    const char *set)
{
        struct window_copy_mode_data    *data = wme->data;

        return (grid_in_set(data->backing->grid, px, py, set));
}

static u_int
window_copy_find_length(struct window_mode_entry *wme, u_int py)
{
        struct window_copy_mode_data    *data = wme->data;

        return (grid_line_length(data->backing->grid, py));
}

static void
window_copy_cursor_start_of_line(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_start_of_line(&gr, 1);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_up(wme, hsize, data->oy, oldy, px, py);
}

static void
window_copy_cursor_back_to_indentation(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_back_to_indentation(&gr);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_up(wme, hsize, data->oy, oldy, px, py);
}

static void
window_copy_cursor_end_of_line(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py =  hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        if (data->screen.sel != NULL && data->rectflag)
                grid_reader_cursor_end_of_line(&gr, 1, 1);
        else
                grid_reader_cursor_end_of_line(&gr, 1, 0);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_down(wme, hsize, screen_size_y(back_s),
            data->oy, oldy, px, py, 0);
}

static void
window_copy_other_end(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        u_int                            selx, sely, cy, yy, hsize;

        if (s->sel == NULL && data->lineflag == LINE_SEL_NONE)
                return;

        if (data->lineflag == LINE_SEL_LEFT_RIGHT)
                data->lineflag = LINE_SEL_RIGHT_LEFT;
        else if (data->lineflag == LINE_SEL_RIGHT_LEFT)
                data->lineflag = LINE_SEL_LEFT_RIGHT;

        switch (data->cursordrag) {
                case CURSORDRAG_NONE:
                case CURSORDRAG_SEL:
                        data->cursordrag = CURSORDRAG_ENDSEL;
                        break;
                case CURSORDRAG_ENDSEL:
                        data->cursordrag = CURSORDRAG_SEL;
                        break;
        }

        selx = data->endselx;
        sely = data->endsely;
        if (data->cursordrag == CURSORDRAG_SEL) {
                selx = data->selx;
                sely = data->sely;
        }

        cy = data->cy;
        yy = screen_hsize(data->backing) + data->cy - data->oy;

        data->cx = selx;

        hsize = screen_hsize(data->backing);
        if (sely < hsize - data->oy) { /* above */
                data->oy = hsize - sely;
                data->cy = 0;
        } else if (sely > hsize - data->oy + screen_size_y(s)) { /* below */
                data->oy = hsize - sely + screen_size_y(s) - 1;
                data->cy = screen_size_y(s) - 1;
        } else
                data->cy = cy + sely - yy;

        window_copy_update_selection(wme, 1, 1);
        window_copy_redraw_screen(wme);
}

static void
window_copy_cursor_left(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_left(&gr, 1);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_up(wme, hsize, data->oy, oldy, px, py);
}

static void
window_copy_cursor_right(struct window_mode_entry *wme, int all)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_right(&gr, 1, all);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_down(wme, hsize, screen_size_y(back_s),
            data->oy, oldy, px, py, 0);
}

static void
window_copy_cursor_up(struct window_mode_entry *wme, int scroll_only)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        u_int                            ox, oy, px, py;
        int                              norectsel;

        norectsel = data->screen.sel == NULL || !data->rectflag;
        oy = screen_hsize(data->backing) + data->cy - data->oy;
        ox = window_copy_find_length(wme, oy);
        if (norectsel && data->cx != ox) {
                data->lastcx = data->cx;
                data->lastsx = ox;
        }

        if (data->lineflag == LINE_SEL_LEFT_RIGHT && oy == data->sely)
                window_copy_other_end(wme);

        if (scroll_only || data->cy == 0) {
                if (norectsel)
                        data->cx = data->lastcx;
                window_copy_scroll_down(wme, 1);
                if (scroll_only) {
                        if (data->cy == screen_size_y(s) - 1)
                                window_copy_redraw_lines(wme, data->cy, 1);
                        else
                                window_copy_redraw_lines(wme, data->cy, 2);
                }
        } else {
                if (norectsel) {
                        window_copy_update_cursor(wme, data->lastcx,
                            data->cy - 1);
                } else
                        window_copy_update_cursor(wme, data->cx, data->cy - 1);
                if (window_copy_update_selection(wme, 1, 0)) {
                        if (data->cy == screen_size_y(s) - 1)
                                window_copy_redraw_lines(wme, data->cy, 1);
                        else
                                window_copy_redraw_lines(wme, data->cy, 2);
                }
        }

        if (norectsel) {
                py = screen_hsize(data->backing) + data->cy - data->oy;
                px = window_copy_find_length(wme, py);
                if ((data->cx >= data->lastsx && data->cx != px) ||
                    data->cx > px)
                {
                        window_copy_update_cursor(wme, px, data->cy);
                        if (window_copy_update_selection(wme, 1, 0))
                                window_copy_redraw_lines(wme, data->cy, 1);
                }
        }

        if (data->lineflag == LINE_SEL_LEFT_RIGHT)
        {
                py = screen_hsize(data->backing) + data->cy - data->oy;
                if (data->rectflag)
                        px = screen_size_x(data->backing);
                else
                        px = window_copy_find_length(wme, py);
                window_copy_update_cursor(wme, px, data->cy);
                if (window_copy_update_selection(wme, 1, 0))
                        window_copy_redraw_lines(wme, data->cy, 1);
        }
        else if (data->lineflag == LINE_SEL_RIGHT_LEFT)
        {
                window_copy_update_cursor(wme, 0, data->cy);
                if (window_copy_update_selection(wme, 1, 0))
                        window_copy_redraw_lines(wme, data->cy, 1);
        }
}

static void
window_copy_cursor_down(struct window_mode_entry *wme, int scroll_only)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        u_int                            ox, oy, px, py;
        int                              norectsel;

        norectsel = data->screen.sel == NULL || !data->rectflag;
        oy = screen_hsize(data->backing) + data->cy - data->oy;
        ox = window_copy_find_length(wme, oy);
        if (norectsel && data->cx != ox) {
                data->lastcx = data->cx;
                data->lastsx = ox;
        }

        if (data->lineflag == LINE_SEL_RIGHT_LEFT && oy == data->endsely)
                window_copy_other_end(wme);

        if (scroll_only || data->cy == screen_size_y(s) - 1) {
                if (norectsel)
                        data->cx = data->lastcx;
                window_copy_scroll_up(wme, 1);
                if (scroll_only && data->cy > 0)
                        window_copy_redraw_lines(wme, data->cy - 1, 2);
        } else {
                if (norectsel) {
                        window_copy_update_cursor(wme, data->lastcx,
                            data->cy + 1);
                } else
                        window_copy_update_cursor(wme, data->cx, data->cy + 1);
                if (window_copy_update_selection(wme, 1, 0))
                        window_copy_redraw_lines(wme, data->cy - 1, 2);
        }

        if (norectsel) {
                py = screen_hsize(data->backing) + data->cy - data->oy;
                px = window_copy_find_length(wme, py);
                if ((data->cx >= data->lastsx && data->cx != px) ||
                    data->cx > px)
                {
                        window_copy_update_cursor(wme, px, data->cy);
                        if (window_copy_update_selection(wme, 1, 0))
                                window_copy_redraw_lines(wme, data->cy, 1);
                }
        }

        if (data->lineflag == LINE_SEL_LEFT_RIGHT)
        {
                py = screen_hsize(data->backing) + data->cy - data->oy;
                if (data->rectflag)
                        px = screen_size_x(data->backing);
                else
                        px = window_copy_find_length(wme, py);
                window_copy_update_cursor(wme, px, data->cy);
                if (window_copy_update_selection(wme, 1, 0))
                        window_copy_redraw_lines(wme, data->cy, 1);
        }
        else if (data->lineflag == LINE_SEL_RIGHT_LEFT)
        {
                window_copy_update_cursor(wme, 0, data->cy);
                if (window_copy_update_selection(wme, 1, 0))
                        window_copy_redraw_lines(wme, data->cy, 1);
        }
}

static void
window_copy_cursor_jump(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx + 1;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        if (grid_reader_cursor_jump(&gr, data->jumpchar)) {
                grid_reader_get_cursor(&gr, &px, &py);
                window_copy_acquire_cursor_down(wme, hsize,
                    screen_size_y(back_s), data->oy, oldy, px, py, 0);
        }
}

static void
window_copy_cursor_jump_back(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_left(&gr, 0);
        if (grid_reader_cursor_jump_back(&gr, data->jumpchar)) {
                grid_reader_get_cursor(&gr, &px, &py);
                window_copy_acquire_cursor_up(wme, hsize, data->oy, oldy, px,
                    py);
        }
}

static void
window_copy_cursor_jump_to(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx + 2;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        if (grid_reader_cursor_jump(&gr, data->jumpchar)) {
                grid_reader_cursor_left(&gr, 1);
                grid_reader_get_cursor(&gr, &px, &py);
                window_copy_acquire_cursor_down(wme, hsize,
                    screen_size_y(back_s), data->oy, oldy, px, py, 0);
        }
}

static void
window_copy_cursor_jump_to_back(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_left(&gr, 0);
        grid_reader_cursor_left(&gr, 0);
        if (grid_reader_cursor_jump_back(&gr, data->jumpchar)) {
                grid_reader_cursor_right(&gr, 1, 0);
                grid_reader_get_cursor(&gr, &px, &py);
                window_copy_acquire_cursor_up(wme, hsize, data->oy, oldy, px,
                    py);
        }
}

static void
window_copy_cursor_next_word(struct window_mode_entry *wme,
    const char *separators)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py =  hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_next_word(&gr, separators);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_down(wme, hsize, screen_size_y(back_s),
            data->oy, oldy, px, py, 0);
}

/* Compute the next place where a word ends. */
static void
window_copy_cursor_next_word_end_pos(struct window_mode_entry *wme,
    const char *separators, u_int *ppx, u_int *ppy)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct options                  *oo = wp->window->options;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py =  hsize + data->cy - data->oy;

        grid_reader_start(&gr, back_s->grid, px, py);
        if (options_get_number(oo, "mode-keys") == MODEKEY_VI) {
                if (!grid_reader_in_set(&gr, WHITESPACE))
                        grid_reader_cursor_right(&gr, 0, 0);
                grid_reader_cursor_next_word_end(&gr, separators);
                grid_reader_cursor_left(&gr, 1);
        } else
                grid_reader_cursor_next_word_end(&gr, separators);
        grid_reader_get_cursor(&gr, &px, &py);
        *ppx = px;
        *ppy = py;
}

/* Move to the next place where a word ends. */
static void
window_copy_cursor_next_word_end(struct window_mode_entry *wme,
    const char *separators, int no_reset)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct options                  *oo = wp->window->options;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py =  hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        if (options_get_number(oo, "mode-keys") == MODEKEY_VI) {
                if (!grid_reader_in_set(&gr, WHITESPACE))
                        grid_reader_cursor_right(&gr, 0, 0);
                grid_reader_cursor_next_word_end(&gr, separators);
                grid_reader_cursor_left(&gr, 1);
        } else
                grid_reader_cursor_next_word_end(&gr, separators);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_down(wme, hsize, screen_size_y(back_s),
            data->oy, oldy, px, py, no_reset);
}

/* Compute the previous place where a word begins. */
static void
window_copy_cursor_previous_word_pos(struct window_mode_entry *wme,
    const char *separators, u_int *ppx, u_int *ppy)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, hsize;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_previous_word(&gr, separators, 0, 1);
        grid_reader_get_cursor(&gr, &px, &py);
        *ppx = px;
        *ppy = py;
}

/* Move to the previous place where a word begins. */
static void
window_copy_cursor_previous_word(struct window_mode_entry *wme,
    const char *separators, int already)
{
        struct window_copy_mode_data    *data = wme->data;
        struct window                   *w = wme->wp->window;
        struct screen                   *back_s = data->backing;
        struct grid_reader               gr;
        u_int                            px, py, oldy, hsize;
        int                              stop_at_eol;

        if (options_get_number(w->options, "mode-keys") == MODEKEY_EMACS)
                stop_at_eol = 1;
        else
                stop_at_eol = 0;

        px = data->cx;
        hsize = screen_hsize(back_s);
        py = hsize + data->cy - data->oy;
        oldy = data->cy;

        grid_reader_start(&gr, back_s->grid, px, py);
        grid_reader_cursor_previous_word(&gr, separators, already, stop_at_eol);
        grid_reader_get_cursor(&gr, &px, &py);
        window_copy_acquire_cursor_up(wme, hsize, data->oy, oldy, px, py);
}

static void
window_copy_cursor_prompt(struct window_mode_entry *wme, int direction,
    int start_output)
{
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = data->backing;
        struct grid                     *gd = s->grid;
        u_int                            end_line;
        u_int                            line = gd->hsize - data->oy + data->cy;
        int                              add, line_flag;

        if (start_output)
                line_flag = GRID_LINE_START_OUTPUT;
        else
                line_flag = GRID_LINE_START_PROMPT;

        if (direction == 0) { /* up */
                add = -1;
                end_line = 0;
        } else { /* down */
                add = 1;
                end_line = gd->hsize + gd->sy - 1;
        }

        if (line == end_line)
                return;
        for (;;) {
                if (line == end_line)
                        return;
                line += add;

                if (grid_get_line(gd, line)->flags & line_flag)
                        break;
        }

        data->cx = 0;
        if (line > gd->hsize) {
                data->cy = line - gd->hsize;
                data->oy = 0;
        } else {
                data->cy = 0;
                data->oy = gd->hsize - line;
        }

        window_copy_update_selection(wme, 1, 0);
        window_copy_redraw_screen(wme);
}

static void
window_copy_scroll_up(struct window_mode_entry *wme, u_int ny)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        struct screen_write_ctx          ctx;

        if (data->oy < ny)
                ny = data->oy;
        if (ny == 0)
                return;
        data->oy -= ny;

        if (data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 0, 0);

        screen_write_start_pane(&ctx, wp, NULL);
        screen_write_cursormove(&ctx, 0, 0, 0);
        screen_write_deleteline(&ctx, ny, 8);
        window_copy_write_lines(wme, &ctx, screen_size_y(s) - ny, ny);
        window_copy_write_line(wme, &ctx, 0);
        if (screen_size_y(s) > 1)
                window_copy_write_line(wme, &ctx, 1);
        if (screen_size_y(s) > 3)
                window_copy_write_line(wme, &ctx, screen_size_y(s) - 2);
        if (s->sel != NULL && screen_size_y(s) > ny)
                window_copy_write_line(wme, &ctx, screen_size_y(s) - ny - 1);
        screen_write_cursormove(&ctx, data->cx, data->cy, 0);
        screen_write_stop(&ctx);
        wp->flags |= PANE_REDRAWSCROLLBAR;
}

static void
window_copy_scroll_down(struct window_mode_entry *wme, u_int ny)
{
        struct window_pane              *wp = wme->wp;
        struct window_copy_mode_data    *data = wme->data;
        struct screen                   *s = &data->screen;
        struct screen_write_ctx          ctx;

        if (ny > screen_hsize(data->backing))
                return;

        if (data->oy > screen_hsize(data->backing) - ny)
                ny = screen_hsize(data->backing) - data->oy;
        if (ny == 0)
                return;
        data->oy += ny;

        if (data->searchmark != NULL && !data->timeout)
                window_copy_search_marks(wme, NULL, data->searchregex, 1);
        window_copy_update_selection(wme, 0, 0);

        screen_write_start_pane(&ctx, wp, NULL);
        screen_write_cursormove(&ctx, 0, 0, 0);
        screen_write_insertline(&ctx, ny, 8);
        window_copy_write_lines(wme, &ctx, 0, ny);
        if (s->sel != NULL && screen_size_y(s) > ny)
                window_copy_write_line(wme, &ctx, ny);
        else if (ny == 1) /* nuke position */
                window_copy_write_line(wme, &ctx, 1);
        screen_write_cursormove(&ctx, data->cx, data->cy, 0);
        screen_write_stop(&ctx);
        wp->flags |= PANE_REDRAWSCROLLBAR;
}

static void
window_copy_rectangle_set(struct window_mode_entry *wme, int rectflag)
{
        struct window_copy_mode_data    *data = wme->data;
        u_int                            px, py;

        data->rectflag = rectflag;

        py = screen_hsize(data->backing) + data->cy - data->oy;
        px = window_copy_find_length(wme, py);
        if (data->cx > px)
                window_copy_update_cursor(wme, px, data->cy);

        window_copy_update_selection(wme, 1, 0);
        window_copy_redraw_screen(wme);
}

static void
window_copy_move_mouse(struct mouse_event *m)
{
        struct window_pane              *wp;
        struct window_mode_entry        *wme;
        u_int                            x, y;

        wp = cmd_mouse_pane(m, NULL, NULL);
        if (wp == NULL)
                return;
        wme = TAILQ_FIRST(&wp->modes);
        if (wme == NULL)
                return;
        if (wme->mode != &window_copy_mode && wme->mode != &window_view_mode)
                return;

        if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
                return;

        window_copy_update_cursor(wme, x, y);
}

void
window_copy_start_drag(struct client *c, struct mouse_event *m)
{
        struct window_pane              *wp;
        struct window_mode_entry        *wme;
        struct window_copy_mode_data    *data;
        u_int                            x, y, yg;

        if (c == NULL)
                return;

        wp = cmd_mouse_pane(m, NULL, NULL);
        if (wp == NULL)
                return;
        wme = TAILQ_FIRST(&wp->modes);
        if (wme == NULL)
                return;
        if (wme->mode != &window_copy_mode && wme->mode != &window_view_mode)
                return;

        if (cmd_mouse_at(wp, m, &x, &y, 1) != 0)
                return;

        c->tty.mouse_drag_update = window_copy_drag_update;
        c->tty.mouse_drag_release = window_copy_drag_release;

        data = wme->data;
        yg = screen_hsize(data->backing) + y - data->oy;
        if (x < data->selrx || x > data->endselrx || yg != data->selry)
                data->selflag = SEL_CHAR;
        switch (data->selflag) {
        case SEL_WORD:
                if (data->separators != NULL) {
                        window_copy_update_cursor(wme, x, y);
                        window_copy_cursor_previous_word_pos(wme,
                            data->separators, &x, &y);
                        y -= screen_hsize(data->backing) - data->oy;
                }
                window_copy_update_cursor(wme, x, y);
                break;
        case SEL_LINE:
                window_copy_update_cursor(wme, 0, y);
                break;
        case SEL_CHAR:
                window_copy_update_cursor(wme, x, y);
                window_copy_start_selection(wme);
                break;
        }

        window_copy_redraw_screen(wme);
        window_copy_drag_update(c, m);
}

static void
window_copy_drag_update(struct client *c, struct mouse_event *m)
{
        struct window_pane              *wp;
        struct window_mode_entry        *wme;
        struct window_copy_mode_data    *data;
        u_int                            x, y, old_cx, old_cy;
        struct timeval                   tv = {
                .tv_usec = WINDOW_COPY_DRAG_REPEAT_TIME
        };

        if (c == NULL)
                return;

        wp = cmd_mouse_pane(m, NULL, NULL);
        if (wp == NULL)
                return;
        wme = TAILQ_FIRST(&wp->modes);
        if (wme == NULL)
                return;
        if (wme->mode != &window_copy_mode && wme->mode != &window_view_mode)
                return;

        data = wme->data;
        evtimer_del(&data->dragtimer);

        if (cmd_mouse_at(wp, m, &x, &y, 0) != 0)
                return;
        old_cx = data->cx;
        old_cy = data->cy;

        window_copy_update_cursor(wme, x, y);
        if (window_copy_update_selection(wme, 1, 0))
                window_copy_redraw_selection(wme, old_cy);
        if (old_cy != data->cy || old_cx == data->cx) {
                if (y == 0) {
                        evtimer_add(&data->dragtimer, &tv);
                        window_copy_cursor_up(wme, 1);
                } else if (y == screen_size_y(&data->screen) - 1) {
                        evtimer_add(&data->dragtimer, &tv);
                        window_copy_cursor_down(wme, 1);
                }
        }
}

static void
window_copy_drag_release(struct client *c, struct mouse_event *m)
{
        struct window_pane              *wp;
        struct window_mode_entry        *wme;
        struct window_copy_mode_data    *data;

        if (c == NULL)
                return;

        wp = cmd_mouse_pane(m, NULL, NULL);
        if (wp == NULL)
                return;
        wme = TAILQ_FIRST(&wp->modes);
        if (wme == NULL)
                return;
        if (wme->mode != &window_copy_mode && wme->mode != &window_view_mode)
                return;

        data = wme->data;
        evtimer_del(&data->dragtimer);
}

static void
window_copy_jump_to_mark(struct window_mode_entry *wme)
{
        struct window_copy_mode_data    *data = wme->data;
        u_int                            tmx, tmy;

        tmx = data->cx;
        tmy = screen_hsize(data->backing) + data->cy - data->oy;
        data->cx = data->mx;
        if (data->my < screen_hsize(data->backing)) {
                data->cy = 0;
                data->oy = screen_hsize(data->backing) - data->my;
        } else {
                data->cy = data->my - screen_hsize(data->backing);
                data->oy = 0;
        }
        data->mx = tmx;
        data->my = tmy;
        data->showmark = 1;
        window_copy_update_selection(wme, 0, 0);
        window_copy_redraw_screen(wme);
}

/* Scroll up if the cursor went off the visible screen. */
static void
window_copy_acquire_cursor_up(struct window_mode_entry *wme, u_int hsize,
    u_int oy, u_int oldy, u_int px, u_int py)
{
        u_int   cy, yy, ny, nd;

        yy = hsize - oy;
        if (py < yy) {
                ny = yy - py;
                cy = 0;
                nd = 1;
        } else {
                ny = 0;
                cy = py - yy;
                nd = oldy - cy + 1;
        }
        while (ny > 0) {
                window_copy_cursor_up(wme, 1);
                ny--;
        }
        window_copy_update_cursor(wme, px, cy);
        if (window_copy_update_selection(wme, 1, 0))
                window_copy_redraw_lines(wme, cy, nd);
}

/* Scroll down if the cursor went off the visible screen. */
static void
window_copy_acquire_cursor_down(struct window_mode_entry *wme, u_int hsize,
    u_int sy, u_int oy, u_int oldy, u_int px, u_int py, int no_reset)
{
        u_int   cy, yy, ny, nd;

        cy = py - hsize + oy;
        yy = sy - 1;
        if (cy > yy) {
                ny = cy - yy;
                oldy = yy;
                nd = 1;
        } else {
                ny = 0;
                nd = cy - oldy + 1;
        }
        while (ny > 0) {
          window_copy_cursor_down(wme, 1);
          ny--;
        }
        if (cy > yy)
                window_copy_update_cursor(wme, px, yy);
        else
                window_copy_update_cursor(wme, px, cy);
        if (window_copy_update_selection(wme, 1, no_reset))
                window_copy_redraw_lines(wme, oldy, nd);
}