/* $OpenBSD: window.c,v 1.369 2026/07/29 14:06:32 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 <sys/ioctl.h>
#include <sys/wait.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <regex.h>
#include <signal.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <util.h>
#include <vis.h>

#include "tmux.h"

/*
 * Each window is attached to a number of panes, each of which is a pty. This
 * file contains code to handle them.
 *
 * A pane has two buffers attached, these are filled and emptied by the main
 * server poll loop. Output data is received from pty's in screen format,
 * translated and returned as a series of escape sequences and strings via
 * input_parse (in input.c). Input data is received as key codes and written
 * directly via input_key.
 *
 * Each pane also has a "virtual" screen (screen.c) which contains the current
 * state and is redisplayed when the window is reattached to a client.
 *
 * Windows are stored directly on a global array and wrapped in any number of
 * winlink structs to be linked onto local session RB trees. A reference count
 * is maintained and a window removed from the global list and destroyed when
 * it reaches zero.
 */

/* Global window list. */
struct windows windows;

/* Global panes tree. */
struct window_pane_tree all_window_panes;
static u_int    next_window_pane_id;
static u_int    next_window_id;
static u_int    next_active_point;

struct window_pane_input_data {
        struct cmdq_item        *item;
        u_int                    wp;
        struct client_file      *file;
};

static struct window_pane *window_pane_create(struct window *, u_int, u_int,
                    u_int);
static void     window_pane_destroy(struct window_pane *);
static void     window_pane_free(struct window_pane *);
static void     window_pane_scrollbar_timer(int, short, void *);
static void     window_pane_full_size_offset(struct window_pane *, int *, int *,
                    u_int *, u_int *);

RB_GENERATE(windows, window, entry, window_cmp);
RB_GENERATE(winlinks, winlink, entry, winlink_cmp);
RB_GENERATE(window_pane_tree, window_pane, tree_entry, window_pane_cmp);

struct window_pane_prompt {
        u_int                    wp_id;
        struct client           *c;
        status_prompt_input_cb   inputcb;
        prompt_free_cb           freecb;
        void                    *data;
        enum prompt_type         type;
};

int
window_cmp(struct window *w1, struct window *w2)
{
        return (w1->id - w2->id);
}

static void
window_fire_renamed(struct window *w, const char *old_name)
{
        struct event_payload    *ep;
        struct cmd_find_state    fs;

        ep = event_payload_create();
        cmd_find_from_window(&fs, w, 0);
        event_payload_set_target(ep, &fs);
        event_payload_set_window(ep, "window", w);
        event_payload_set_string(ep, "old_name", "%s", old_name);
        event_payload_set_string(ep, "new_name", "%s", w->name);
        events_fire("window-renamed", ep);
}

static void
window_fire_pane_changed(struct window *w, struct window_pane *wp,
    struct window_pane *lastwp)
{
        struct event_payload    *ep;
        struct cmd_find_state    fs;

        ep = event_payload_create();
        cmd_find_from_pane(&fs, wp, 0);
        event_payload_set_target(ep, &fs);
        event_payload_set_window(ep, "window", w);
        event_payload_set_pane(ep, "pane", wp);
        event_payload_set_pane(ep, "new_pane", wp);
        if (lastwp != NULL)
                event_payload_set_pane(ep, "old_pane", lastwp);
        events_fire("window-pane-changed", ep);
}

void
window_fire_pane_moved(struct window_pane *wp, struct window *old_w,
    int old_idx, struct window *new_w, int new_idx)
{
        struct event_payload    *ep;
        struct cmd_find_state    fs;

        ep = event_payload_create();
        cmd_find_from_pane(&fs, wp, 0);
        event_payload_set_target(ep, &fs);
        event_payload_set_pane(ep, "pane", wp);
        event_payload_set_window(ep, "window", new_w);
        event_payload_set_window(ep, "old_window", old_w);
        event_payload_set_window(ep, "new_window", new_w);
        if (old_idx != -1)
                event_payload_set_int(ep, "old_window_index", old_idx);
        if (new_idx != -1) {
                event_payload_set_int(ep, "window_index", new_idx);
                event_payload_set_int(ep, "new_window_index", new_idx);
        }
        events_fire("pane-moved", ep);
}

static void
window_fire_pane_mode_changed(const char *name, struct window_pane *wp,
    const char *previous, const char *current, int entered)
{
        struct event_payload    *ep;
        struct cmd_find_state    fs;

        ep = event_payload_create();
        cmd_find_from_pane(&fs, wp, 0);
        event_payload_set_target(ep, &fs);
        event_payload_set_pane(ep, "pane", wp);
        event_payload_set_window(ep, "window", wp->window);

        if (current != NULL)
                event_payload_set_string(ep, "current_mode", "%s", current);
        if (previous != NULL)
                event_payload_set_string(ep, "previous_mode", "%s", previous);
        event_payload_set_int(ep, "mode_entered", entered);

        events_fire(name, ep);
}

static void
window_fire_pane_prompt(const char *name, struct window_pane *wp,
    enum prompt_type type)
{
        struct event_payload    *ep;
        struct cmd_find_state    fs;
        const char              *type_string = prompt_type_string(type);

        ep = event_payload_create();
        cmd_find_from_pane(&fs, wp, 0);
        event_payload_set_target(ep, &fs);
        event_payload_set_pane(ep, "pane", wp);
        event_payload_set_window(ep, "window", wp->window);
        event_payload_set_string(ep, "prompt_type", "%s", type_string);
        events_fire(name, ep);
}

int
winlink_cmp(struct winlink *wl1, struct winlink *wl2)
{
        return (wl1->idx - wl2->idx);
}

int
window_pane_cmp(struct window_pane *wp1, struct window_pane *wp2)
{
        return (wp1->id - wp2->id);
}

struct winlink *
winlink_find_by_window(struct winlinks *wwl, struct window *w)
{
        struct winlink  *wl;

        RB_FOREACH(wl, winlinks, wwl) {
                if (wl->window == w)
                        return (wl);
        }

        return (NULL);
}

struct winlink *
winlink_find_by_index(struct winlinks *wwl, int idx)
{
        struct winlink  wl;

        if (idx < 0)
                fatalx("bad index");

        wl.idx = idx;
        return (RB_FIND(winlinks, wwl, &wl));
}

struct winlink *
winlink_find_by_window_id(struct winlinks *wwl, u_int id)
{
        struct winlink *wl;

        RB_FOREACH(wl, winlinks, wwl) {
                if (wl->window->id == id)
                        return (wl);
        }
        return (NULL);
}

static int
winlink_next_index(struct winlinks *wwl, int idx)
{
        int     i;

        i = idx;
        do {
                if (winlink_find_by_index(wwl, i) == NULL)
                        return (i);
                if (i == INT_MAX)
                        i = 0;
                else
                        i++;
        } while (i != idx);
        return (-1);
}

u_int
winlink_count(struct winlinks *wwl)
{
        struct winlink  *wl;
        u_int            n;

        n = 0;
        RB_FOREACH(wl, winlinks, wwl)
                n++;

        return (n);
}

struct winlink *
winlink_add(struct winlinks *wwl, int idx)
{
        struct winlink  *wl;

        if (idx < 0) {
                if ((idx = winlink_next_index(wwl, -idx - 1)) == -1)
                        return (NULL);
        } else if (winlink_find_by_index(wwl, idx) != NULL)
                return (NULL);

        wl = xcalloc(1, sizeof *wl);
        wl->idx = idx;
        RB_INSERT(winlinks, wwl, wl);

        return (wl);
}

void
winlink_set_window(struct winlink *wl, struct window *w)
{
        if (wl->window != NULL) {
                TAILQ_REMOVE(&wl->window->winlinks, wl, wentry);
                window_remove_ref(wl->window, __func__);
        }
        TAILQ_INSERT_TAIL(&w->winlinks, wl, wentry);
        wl->window = w;
        window_add_ref(w, __func__);
}

void
winlink_remove(struct winlinks *wwl, struct winlink *wl)
{
        struct window   *w = wl->window;

        if (w != NULL) {
                TAILQ_REMOVE(&w->winlinks, wl, wentry);
                window_remove_ref(w, __func__);
        }

        RB_REMOVE(winlinks, wwl, wl);
        free(wl);
}

struct winlink *
winlink_next(struct winlink *wl)
{
        return (RB_NEXT(winlinks, wwl, wl));
}

struct winlink *
winlink_previous(struct winlink *wl)
{
        return (RB_PREV(winlinks, wwl, wl));
}

struct winlink *
winlink_next_by_number(struct winlink *wl, struct session *s, int n)
{
        for (; n > 0; n--) {
                if ((wl = RB_NEXT(winlinks, wwl, wl)) == NULL)
                        wl = RB_MIN(winlinks, &s->windows);
        }

        return (wl);
}

struct winlink *
winlink_previous_by_number(struct winlink *wl, struct session *s, int n)
{
        for (; n > 0; n--) {
                if ((wl = RB_PREV(winlinks, wwl, wl)) == NULL)
                        wl = RB_MAX(winlinks, &s->windows);
        }

        return (wl);
}

void
winlink_stack_push(struct winlink_stack *stack, struct winlink *wl)
{
        if (wl == NULL)
                return;

        winlink_stack_remove(stack, wl);
        TAILQ_INSERT_HEAD(stack, wl, sentry);
        wl->flags |= WINLINK_VISITED;
}

void
winlink_stack_remove(struct winlink_stack *stack, struct winlink *wl)
{
        if (wl != NULL && (wl->flags & WINLINK_VISITED)) {
                TAILQ_REMOVE(stack, wl, sentry);
                wl->flags &= ~WINLINK_VISITED;
        }
}

struct window *
window_find_by_id_str(const char *s)
{
        const char      *errstr;
        u_int            id;

        if (*s != '@')
                return (NULL);

        id = strtonum(s + 1, 0, UINT_MAX, &errstr);
        if (errstr != NULL)
                return (NULL);
        return (window_find_by_id(id));
}

struct window *
window_find_by_id(u_int id)
{
        struct window   w;

        w.id = id;
        return (RB_FIND(windows, &windows, &w));
}

void
window_update_activity(struct window *w)
{
        gettimeofday(&w->activity_time, NULL);
        alerts_queue(w, WINDOW_ACTIVITY);
}

struct window *
window_create(u_int sx, u_int sy, u_int xpixel, u_int ypixel)
{
        struct window   *w;

        if (xpixel == 0)
                xpixel = DEFAULT_XPIXEL;
        if (ypixel == 0)
                ypixel = DEFAULT_YPIXEL;

        w = xcalloc(1, sizeof *w);
        w->name = xstrdup("");
        w->flags = 0;

        TAILQ_INIT(&w->panes);
        TAILQ_INIT(&w->z_index);
        TAILQ_INIT(&w->last_panes);
        w->active = NULL;

        w->lastlayout = -1;
        w->layout_root = NULL;

        w->sx = sx;
        w->sy = sy;
        w->manual_sx = sx;
        w->manual_sy = sy;
        w->xpixel = xpixel;
        w->ypixel = ypixel;

        w->options = options_create(global_w_options);
        w->sb = options_get_number(w->options, "pane-scrollbars");
        w->sb_pos = options_get_number(w->options, "pane-scrollbars-position");

        w->references = 0;
        TAILQ_INIT(&w->winlinks);

        w->id = next_window_id++;
        RB_INSERT(windows, &windows, w);

        if (gettimeofday(&w->creation_time, NULL) != 0)
                fatal("gettimeofday failed");
        window_update_activity(w);

        log_debug("%s: @%u create %ux%u (%ux%u)", __func__, w->id, sx, sy,
            w->xpixel, w->ypixel);
        return (w);
}

static void
window_destroy(struct window *w)
{
        log_debug("window @%u destroyed (%d references)", w->id, w->references);

        window_unzoom(w, 0);
        RB_REMOVE(windows, &windows, w);

        layout_free_cell(w->layout_root, 0);
        layout_free_cell(w->saved_layout_root, 0);
        free(w->old_layout);

        menu_destroy(w);
        window_destroy_panes(w);

        if (event_initialized(&w->name_event))
                evtimer_del(&w->name_event);

        if (event_initialized(&w->alerts_timer))
                evtimer_del(&w->alerts_timer);
        if (event_initialized(&w->offset_timer))
                event_del(&w->offset_timer);

        options_free(w->options);

        free(w->name);
        free(w);
}

int
window_pane_destroy_ready(struct window_pane *wp)
{
        int     n;

        if (wp->pipe_fd != -1 && EVBUFFER_LENGTH(wp->pipe_event->output) != 0)
                return (0);
        if (ioctl(wp->fd, FIONREAD, &n) != -1 && n > 0)
                return (0);

        if (~wp->flags & PANE_EXITED)
                return (0);

        /*
         * If a command queue item is blocked on this pane, wait for the
         * child's exit status before destroying it.
         */
        if (wp->wait_item != NULL && (~wp->flags & PANE_STATUSREADY))
                return (0);
        if (wp->editor != NULL && (~wp->flags & PANE_STATUSREADY))
                return (0);
        return (1);
}

void
window_add_ref(struct window *w, const char *from)
{
        w->references++;
        log_debug("%s: @%u %s, now %d", __func__, w->id, from, w->references);
}

void
window_remove_ref(struct window *w, const char *from)
{
        if (w->references == 1)
                events_fire_window("window-closed", w);

        w->references--;
        log_debug("%s: @%u %s, now %d", __func__, w->id, from, w->references);

        if (w->references == 0)
                window_destroy(w);
}

void
window_pane_add_ref(struct window_pane *wp, const char *from)
{
        wp->references++;
        log_debug("%s: %%%u %s, now %d", __func__, wp->id, from,
            wp->references);
}

void
window_pane_remove_ref(struct window_pane *wp, const char *from)
{
        wp->references--;
        log_debug("%s: %%%u %s, now %d", __func__, wp->id, from,
            wp->references);

        if (wp->references == 0)
                window_pane_free(wp);
}

void
window_set_name(struct window *w, const char *new_name, int untrusted)
{
        char    *last, *name;

        name = clean_name(new_name, untrusted);
        if (name != NULL) {
                last = xstrdup(w->name);
                free(w->name);
                w->name = name;
                window_fire_renamed(w, last);
                free(last);
        }
}

void
window_resize(struct window *w, u_int sx, u_int sy, int xpixel, int ypixel)
{
        if (xpixel == 0)
                xpixel = DEFAULT_XPIXEL;
        if (ypixel == 0)
                ypixel = DEFAULT_YPIXEL;

        log_debug("%s: @%u resize %ux%u (%ux%u)", __func__, w->id, sx, sy,
            xpixel == -1 ? w->xpixel : (u_int)xpixel,
            ypixel == -1 ? w->ypixel : (u_int)ypixel);
        w->sx = sx;
        w->sy = sy;
        if (w->menu != NULL) {
                menu_resize(w->menu, w);
                server_redraw_window(w);
        }
        if (xpixel != -1)
                w->xpixel = xpixel;
        if (ypixel != -1)
                w->ypixel = ypixel;
        redraw_invalidate_scene(w);
}

void
window_pane_send_resize(struct window_pane *wp, u_int sx, u_int sy)
{
        struct window   *w = wp->window;
        struct winsize   ws;

        if (wp->fd == -1)
                return;

        log_debug("%s: %%%u resize to %u,%u", __func__, wp->id, sx, sy);

        memset(&ws, 0, sizeof ws);
        ws.ws_col = sx;
        ws.ws_row = sy;
        ws.ws_xpixel = w->xpixel * ws.ws_col;
        ws.ws_ypixel = w->ypixel * ws.ws_row;
        if (ioctl(wp->fd, TIOCSWINSZ, &ws) == -1)
                fatal("ioctl failed");
}

int
window_has_floating_panes(struct window *w)
{
        struct window_pane      *wp;

        TAILQ_FOREACH(wp, &w->panes, entry) {
                if (window_pane_is_floating(wp))
                        return (1);
        }
        return (0);
}

int
window_has_pane(struct window *w, struct window_pane *wp)
{
        struct window_pane      *wp1;

        TAILQ_FOREACH(wp1, &w->panes, entry) {
                if (wp1 == wp)
                        return (1);
        }
        return (0);
}

int
window_pane_contains(struct window_pane *wp, u_int x, u_int y)
{
        int     xoff, yoff;
        u_int   sx, sy;

        if (!window_pane_is_visible(wp))
                return (0);

        window_pane_full_size_offset(wp, &xoff, &yoff, &sx, &sy);
        if (!window_pane_is_floating(wp)) {
                if ((int)x < xoff || x > xoff + sx)
                        return (0);
                if ((int)y < yoff || y > yoff + sy)
                        return (0);
        } else if (window_pane_get_pane_lines(wp) == PANE_LINES_NONE) {
                if ((int)x < xoff || (int)x >= xoff + (int)sx)
                        return (0);
                if ((int)y < yoff || (int)y >= yoff + (int)sy)
                        return (0);
        } else {
                if ((int)x < xoff - 1 || x > xoff + sx)
                        return (0);
                if ((int)y < yoff - 1 || y > yoff + sy)
                        return (0);
        }
        return (1);
}

void
window_update_focus(struct window *w)
{
        if (w != NULL) {
                log_debug("%s: @%u", __func__, w->id);
                window_pane_update_focus(w->active);
        }
}

void
window_pane_update_focus(struct window_pane *wp)
{
        struct client   *c;
        int              focused = 0;

        if (wp != NULL && (~wp->flags & PANE_EXITED)) {
                if (wp != wp->window->active)
                        focused = 0;
                else {
                        TAILQ_FOREACH(c, &clients, entry) {
                                if (c->session != NULL &&
                                    c->session->attached != 0 &&
                                    (c->flags & CLIENT_FOCUSED) &&
                                    c->session->curw->window == wp->window &&
                                    c->overlay_draw == NULL &&
                                    wp->window->menu == NULL) {
                                        focused = 1;
                                        break;
                                }
                        }
                }
                if (!focused && (wp->flags & PANE_FOCUSED)) {
                        log_debug("%s: %%%u focus out", __func__, wp->id);
                        if (wp->base.mode & MODE_FOCUSON)
                                bufferevent_write(wp->event, "\033[O", 3);
                        events_fire_pane("pane-focus-out", wp);
                        wp->flags &= ~PANE_FOCUSED;
                } else if (focused && (~wp->flags & PANE_FOCUSED)) {
                        log_debug("%s: %%%u focus in", __func__, wp->id);
                        if (wp->base.mode & MODE_FOCUSON)
                                bufferevent_write(wp->event, "\033[I", 3);
                        events_fire_pane("pane-focus-in", wp);
                        wp->flags |= PANE_FOCUSED;
                } else
                        log_debug("%s: %%%u focus unchanged", __func__, wp->id);
        }
}

int
window_set_active_pane(struct window *w, struct window_pane *wp, int notify)
{
        struct window_pane *lastwp;

        log_debug("%s: pane %%%u", __func__, wp->id);

        if (wp == w->active)
                return (0);
        if (w->modal != NULL && wp != w->modal)
                return (0);
        if (w->flags & WINDOW_ZOOMED)
                window_unzoom(w, 1);
        lastwp = w->active;

        window_pane_stack_remove(&w->last_panes, wp);
        window_pane_stack_push(&w->last_panes, lastwp);

        w->active = wp;
        w->active->active_point = next_active_point++;
        w->active->flags |= PANE_CHANGED;

        if (options_get_number(global_options, "focus-events")) {
                window_pane_update_focus(lastwp);
                window_pane_update_focus(w->active);
        }

        tty_update_window_offset(w);
        server_redraw_window(w);

        if (notify)
                window_fire_pane_changed(w, w->active, lastwp);
        return (1);
}

static int
window_pane_get_palette(struct window_pane *wp, int c)
{
        if (wp == NULL)
                return (-1);
        return (colour_palette_get(&wp->palette, c));
}

void
window_redraw_active_switch(struct window *w, struct window_pane *wp)
{
        struct grid_cell        *gc1, *gc2;
        int                      c1, c2;

        if (w->modal != NULL && wp != w->modal)
                return;
        if (wp == w->active)
                return;

        for (;;) {
                /*
                 * If the active and inactive styles or palettes are different,
                 * need to redraw the panes.
                 */
                gc1 = &wp->cached_gc;
                gc2 = &wp->cached_active_gc;
                if (!grid_cells_look_equal(gc1, gc2))
                        wp->flags |= PANE_REDRAW;
                else if (wp->cached_dim != wp->cached_active_dim)
                        wp->flags |= PANE_REDRAW;
                else {
                        c1 = window_pane_get_palette(wp, gc1->fg);
                        c2 = window_pane_get_palette(wp, gc2->fg);
                        if (c1 != c2)
                                wp->flags |= PANE_REDRAW;
                        else {
                                c1 = window_pane_get_palette(wp, gc1->bg);
                                c2 = window_pane_get_palette(wp, gc2->bg);
                                if (c1 != c2)
                                        wp->flags |= PANE_REDRAW;
                        }
                }
                if (wp == w->active)
                        break;

                /* If the pane is floating, move to the front. */
                if (window_pane_is_floating(wp)) {
                        TAILQ_REMOVE(&w->z_index, wp, zentry);
                        TAILQ_INSERT_HEAD(&w->z_index, wp, zentry);
                        wp->flags |= PANE_REDRAW;
                        redraw_invalidate_scene(w);
                }

                wp = w->active;
                if (wp == NULL)
                        break;
        }
}

struct window_pane *
window_get_active_at(struct window *w, u_int x, u_int y)
{
        struct window_pane      *wp;
        int                      pane_status, xoff, yoff;
        u_int                    sx, sy;

        pane_status = window_get_pane_status(w);

        if (w->modal != NULL) {
                if (window_pane_contains(w->modal, x, y))
                        return (w->modal);
                return (NULL);
        }

        if (pane_status == PANE_STATUS_TOP) {
                /*
                 * Prefer a pane's top border status line over the pane above's
                 * bottom border.
                 */
                TAILQ_FOREACH(wp, &w->z_index, zentry) {
                        if (!window_pane_is_visible(wp) ||
                            window_pane_is_floating(wp))
                                continue;

                        window_pane_full_size_offset(wp, &xoff, &yoff, &sx,
                            &sy);
                        if ((int)x < xoff || x > xoff + sx)
                                continue;
                        if ((int)y == yoff - 1)
                                return (wp);
                }
        }

        TAILQ_FOREACH(wp, &w->z_index, zentry) {
                if (!window_pane_is_visible(wp))
                        continue;
                window_pane_full_size_offset(wp, &xoff, &yoff, &sx, &sy);
                if (!window_pane_is_floating(wp)) {
                        /*
                         * Tiled - to and including the right border, excluding
                         * the bottom border.
                         */
                        if ((int)x < xoff || x > xoff + sx)
                                continue;
                        if (pane_status == PANE_STATUS_TOP) {
                                if ((int)y < yoff - 1 || y > yoff + sy)
                                        continue;
                        } else {
                                if ((int)y < yoff || y > yoff + sy)
                                        continue;
                        }
                } else {
                        if (window_pane_get_pane_lines(wp) == PANE_LINES_NONE) {
                                if ((int)x < xoff || (int)x >= xoff + (int)sx)
                                        continue;
                                if ((int)y < yoff || (int)y >= yoff + (int)sy)
                                        continue;
                        } else {
                                /* Floating - include all borders. */
                                if ((int)x < xoff - 1 || x > xoff + sx)
                                        continue;
                                if ((int)y < yoff - 1 || y > yoff + sy)
                                        continue;
                        }
                }
                return (wp);
        }
        return (NULL);
}

struct window_pane *
window_find_string(struct window *w, const char *s)
{
        u_int   x, y, top = 0, bottom = w->sy - 1;
        int     status;

        x = w->sx / 2;
        y = w->sy / 2;

        status = window_get_pane_status(w);
        if (status == PANE_STATUS_TOP)
                top++;
        else if (status == PANE_STATUS_BOTTOM)
                bottom--;

        if (strcasecmp(s, "top") == 0)
                y = top;
        else if (strcasecmp(s, "bottom") == 0)
                y = bottom;
        else if (strcasecmp(s, "left") == 0)
                x = 0;
        else if (strcasecmp(s, "right") == 0)
                x = w->sx - 1;
        else if (strcasecmp(s, "top-left") == 0) {
                x = 0;
                y = top;
        } else if (strcasecmp(s, "top-right") == 0) {
                x = w->sx - 1;
                y = top;
        } else if (strcasecmp(s, "bottom-left") == 0) {
                x = 0;
                y = bottom;
        } else if (strcasecmp(s, "bottom-right") == 0) {
                x = w->sx - 1;
                y = bottom;
        } else
                return (NULL);

        return (window_get_active_at(w, x, y));
}

int
window_zoom(struct window_pane *wp)
{
        struct window           *w = wp->window;
        struct window_pane      *wp1;

        if (w->flags & WINDOW_ZOOMED)
                return (-1);
        if (window_count_panes(w, 1) == 1)
                return (-1);

        if (w->active != wp)
                window_set_active_pane(w, wp, 1);
        wp->flags |= PANE_ZOOMED;

        TAILQ_FOREACH(wp1, &w->panes, entry) {
                wp1->saved_layout_cell = wp1->layout_cell;
                wp1->layout_cell = NULL;
        }

        w->saved_layout_root = w->layout_root;
        layout_init(w, wp);
        w->flags |= WINDOW_ZOOMED;
        events_fire_window("window-zoomed", w);
        events_fire_window("window-layout-changed", w);

        redraw_invalidate_scene(w);
        return (0);
}

int
window_unzoom(struct window *w, int notify)
{
        struct window_pane      *wp;

        if (!(w->flags & WINDOW_ZOOMED))
                return (-1);

        w->flags &= ~WINDOW_ZOOMED;
        layout_free(w, 0);
        w->layout_root = w->saved_layout_root;
        w->saved_layout_root = NULL;

        TAILQ_FOREACH(wp, &w->panes, entry) {
                wp->layout_cell = wp->saved_layout_cell;
                wp->saved_layout_cell = NULL;
                wp->flags &= ~PANE_ZOOMED;
        }
        layout_fix_panes(w, NULL);

        if (notify) {
                events_fire_window("window-unzoomed", w);
                events_fire_window("window-layout-changed", w);
        }

        redraw_invalidate_scene(w);
        return (0);
}

void
window_push_modal_zoom(struct window *w)
{
        if (w->flags & WINDOW_ZOOMED)
                w->flags |= WINDOW_WASMODALZOOMED;
        else
                w->flags &= ~WINDOW_WASMODALZOOMED;
        window_unzoom(w, 1);
}

int
window_pop_modal_zoom(struct window *w)
{
        struct window_pane      *wp = w->active;

        if (~w->flags & WINDOW_WASMODALZOOMED)
                return (0);
        w->flags &= ~WINDOW_WASMODALZOOMED;
        if (wp != NULL && window_has_pane(w, wp))
                return (window_zoom(wp) == 0);
        return (0);
}

int
window_push_zoom(struct window *w, int always, int flag)
{
        log_debug("%s: @%u %d", __func__, w->id,
            flag && (w->flags & WINDOW_ZOOMED));
        if (flag && (always || (w->flags & WINDOW_ZOOMED)))
                w->flags |= WINDOW_WASZOOMED;
        else
                w->flags &= ~WINDOW_WASZOOMED;
        return (window_unzoom(w, 1) == 0);
}

int
window_pop_zoom(struct window *w)
{
        log_debug("%s: @%u %d", __func__, w->id,
            !!(w->flags & WINDOW_WASZOOMED));
        if (w->flags & WINDOW_WASZOOMED)
                return (window_zoom(w->active) == 0);
        return (0);
}

struct window_pane *
window_add_pane(struct window *w, struct window_pane *other, u_int hlimit,
    int flags)
{
        struct window_pane      *wp;

        if (other == NULL)
                other = w->active;

        wp = window_pane_create(w, w->sx, w->sy, hlimit);
        if (TAILQ_EMPTY(&w->panes)) {
                log_debug("%s: @%u at start", __func__, w->id);
                TAILQ_INSERT_HEAD(&w->panes, wp, entry);
        } else if (flags & SPAWN_BEFORE) {
                log_debug("%s: @%u before %%%u", __func__, w->id, wp->id);
                if (flags & SPAWN_FULLSIZE)
                        TAILQ_INSERT_HEAD(&w->panes, wp, entry);
                else
                        TAILQ_INSERT_BEFORE(other, wp, entry);
        } else {
                log_debug("%s: @%u after %%%u", __func__, w->id, wp->id);
                if (flags & (SPAWN_FULLSIZE|SPAWN_FLOATING))
                        TAILQ_INSERT_TAIL(&w->panes, wp, entry);
                else
                        TAILQ_INSERT_AFTER(&w->panes, other, wp, entry);
        }
        if (~flags & SPAWN_FLOATING)
                TAILQ_INSERT_TAIL(&w->z_index, wp, zentry);
        else if (w->modal != NULL)
                TAILQ_INSERT_AFTER(&w->z_index, w->modal, wp, zentry);
        else {
                TAILQ_INSERT_HEAD(&w->z_index, wp, zentry);
        }
        redraw_invalidate_scene(w);
        return (wp);
}

void
window_lost_pane(struct window *w, struct window_pane *wp)
{
        struct window_pane      *lastwp;

        log_debug("%s: @%u pane %%%u", __func__, w->id, wp->id);

        if (wp == marked_pane.wp)
                server_clear_marked();
        if (wp == w->modal_last)
                w->modal_last = NULL;
        if (w->modal_last == NULL)
                w->flags &= ~WINDOW_WASMODALZOOMED;

        window_pane_stack_remove(&w->last_panes, wp);
        if (wp == w->active) {
                lastwp = NULL;
                if (wp == w->modal) {
                        lastwp = w->modal_last;
                        w->modal = NULL;
                        w->modal_last = NULL;
                }
                if (lastwp != NULL && window_has_pane(w, lastwp))
                        w->active = lastwp;
                else
                        w->active = TAILQ_FIRST(&w->last_panes);
                if (w->active == NULL) {
                        w->active = TAILQ_PREV(wp, window_panes, entry);
                        if (w->active == NULL)
                                w->active = TAILQ_NEXT(wp, entry);
                }
                if (w->active != NULL) {
                        window_pane_stack_remove(&w->last_panes, w->active);
                        w->active->flags |= PANE_CHANGED;
                        window_fire_pane_changed(w, w->active, wp);
                        window_update_focus(w);
                }
        } else if (wp == w->modal) {
                w->modal = w->modal_last = NULL;
                w->flags &= ~WINDOW_WASMODALZOOMED;
        }
        redraw_invalidate_scene(w);
}

void
window_remove_pane(struct window *w, struct window_pane *wp)
{
        int     pop = (wp == w->modal);

        window_lost_pane(w, wp);
        TAILQ_REMOVE(&w->panes, wp, entry);
        TAILQ_REMOVE(&w->z_index, wp, zentry);
        if (pop && window_pop_modal_zoom(w))
                server_redraw_window(w);
        redraw_invalidate_scene(w);
        window_pane_destroy(wp);
}

struct window_pane *
window_pane_at_index(struct window *w, u_int idx)
{
        struct window_pane      *wp;
        u_int                    n;

        n = options_get_number(w->options, "pane-base-index");
        TAILQ_FOREACH(wp, &w->panes, entry) {
                if (n == idx)
                        return (wp);
                n++;
        }
        return (NULL);
}

struct window_pane *
window_pane_next_by_number(struct window *w, struct window_pane *wp, u_int n)
{
        for (; n > 0; n--) {
                if ((wp = TAILQ_NEXT(wp, entry)) == NULL)
                        wp = TAILQ_FIRST(&w->panes);
        }

        return (wp);
}

struct window_pane *
window_pane_previous_by_number(struct window *w, struct window_pane *wp,
    u_int n)
{
        for (; n > 0; n--) {
                if ((wp = TAILQ_PREV(wp, window_panes, entry)) == NULL)
                        wp = TAILQ_LAST(&w->panes, window_panes);
        }

        return (wp);
}

int
window_pane_index(struct window_pane *wp, u_int *i)
{
        struct window           *w = wp->window;
        struct window_pane      *wq;

        *i = options_get_number(w->options, "pane-base-index");
        TAILQ_FOREACH(wq, &w->panes, entry) {
                if (wp == wq) {
                        return (0);
                }
                (*i)++;
        }

        return (-1);
}

int
window_pane_zindex(struct window_pane *wp, u_int *i)
{
        struct window           *w = wp->window;
        struct window_pane      *wq;

        *i = 0;
        TAILQ_FOREACH(wq, &w->z_index, zentry) {
                if (wq == wp) {
                        if (!window_pane_is_floating(wp))
                                (*i)++;
                        return (0);
                }
                if (window_pane_is_floating(wq))
                        (*i)++;
        }

        return (-1);
}

u_int
window_count_panes(struct window *w, int with_floating)
{
        struct window_pane      *wp;
        u_int                    n = 0;

        TAILQ_FOREACH(wp, &w->panes, entry) {
                if (with_floating || !window_pane_is_floating(wp))
                        n++;
        }
        return (n);
}

void
window_destroy_panes(struct window *w)
{
        struct window_pane      *wp;

        while (!TAILQ_EMPTY(&w->last_panes)) {
                wp = TAILQ_FIRST(&w->last_panes);
                window_pane_stack_remove(&w->last_panes, wp);
        }

        while (!TAILQ_EMPTY(&w->panes)) {
                wp = TAILQ_FIRST(&w->panes);
                TAILQ_REMOVE(&w->panes, wp, entry);
                TAILQ_REMOVE(&w->z_index, wp, zentry);
                window_pane_destroy(wp);
        }
}

const char *
window_printable_flags(struct winlink *wl, int escape)
{
        struct session  *s = wl->session;
        static char      flags[32];
        u_int            pos = 0;

        if (wl->flags & WINLINK_ACTIVITY) {
                flags[pos++] = '#';
                if (escape)
                        flags[pos++] = '#';
        }
        if (wl->flags & WINLINK_BELL)
                flags[pos++] = '!';
        if (wl->flags & WINLINK_SILENCE)
                flags[pos++] = '~';
        if (wl == s->curw)
                flags[pos++] = '*';
        if (wl == TAILQ_FIRST(&s->lastw))
                flags[pos++] = '-';
        if (server_check_marked() && wl == marked_pane.wl)
                flags[pos++] = 'M';
        if (wl->window->modal != NULL)
                flags[pos++] = 'O';
        if (wl->window->flags & WINDOW_ZOOMED)
                flags[pos++] = 'Z';
        flags[pos] = '\0';
        return (flags);
}

const char *
window_pane_printable_flags(struct window_pane *wp)
{
        struct window   *w = wp->window;
        static char      flags[32];
        int              pos = 0;

        if (wp == w->active)
                flags[pos++] = '*';
        if (wp == TAILQ_FIRST(&w->last_panes))
                flags[pos++] = '-';
        if (wp->flags & PANE_ZOOMED)
                flags[pos++] = 'Z';
        if (window_pane_is_floating(wp))
                flags[pos++] = 'F';
        if (wp == w->modal)
                flags[pos++] = 'O';
        flags[pos] = '\0';
        return (flags);
}

struct window_pane *
window_pane_find_by_id_str(const char *s)
{
        const char      *errstr;
        u_int            id;

        if (*s != '%')
                return (NULL);

        id = strtonum(s + 1, 0, UINT_MAX, &errstr);
        if (errstr != NULL)
                return (NULL);
        return (window_pane_find_by_id(id));
}

struct window_pane *
window_pane_find_by_id(u_int id)
{
        struct window_pane      wp;

        wp.id = id;
        return (RB_FIND(window_pane_tree, &all_window_panes, &wp));
}

static struct window_pane *
window_pane_create(struct window *w, u_int sx, u_int sy, u_int hlimit)
{
        struct window_pane      *wp;
        char                     host[HOST_NAME_MAX + 1];

        wp = xcalloc(1, sizeof *wp);
        wp->references = 1;
        wp->window = w;
        wp->options = options_create(w->options);
        wp->flags = PANE_STYLECHANGED;
        wp->cmd_status = -1;

        wp->id = next_window_pane_id++;
        RB_INSERT(window_pane_tree, &all_window_panes, wp);

        wp->fd = -1;

        TAILQ_INIT(&wp->modes);

        TAILQ_INIT (&wp->resize_queue);

        wp->sx = sx;
        wp->sy = sy;

        wp->pipe_fd = -1;

        wp->control_bg = -1;
        wp->control_fg = -1;

        style_set_scrollbar_style_from_option(&wp->scrollbar_style,
            wp->options);

        colour_palette_init(&wp->palette);
        colour_palette_from_option(&wp->palette, wp->options);

        screen_init(&wp->base, sx, sy, hlimit);
        wp->screen = &wp->base;
        window_pane_default_cursor(wp);

        screen_init(&wp->status_screen, 1, 1, 0);
        style_ranges_init(&wp->border_status_line.ranges);
        evtimer_set(&wp->sb_auto_timer, window_pane_scrollbar_timer, wp);

        if (gethostname(host, sizeof host) == 0)
                screen_set_title(&wp->base, host, 0);

        return (wp);
}

void
window_pane_wait_finish(struct window_pane *wp)
{
        struct cmdq_item        *item = wp->wait_item;
        struct client           *c;
        int                      retval = 0;

        if (item == NULL)
                return;
        wp->wait_item = NULL;

        if (wp->flags & PANE_STATUSREADY) {
                if (WIFEXITED(wp->status))
                        retval = WEXITSTATUS(wp->status);
                else if (WIFSIGNALED(wp->status))
                        retval = WTERMSIG(wp->status) + 128;
        }

        c = cmdq_get_client(item);
        if (c != NULL && c->session == NULL)
                c->retval = retval;
        cmdq_continue(item);
}

static void
window_pane_free_modes(struct window_pane *wp)
{
        struct window_mode_entry        *wme;

        while (!TAILQ_EMPTY(&wp->modes)) {
                wme = TAILQ_FIRST(&wp->modes);
                TAILQ_REMOVE(&wp->modes, wme, entry);
                wme->mode->free(wme);
                free(wme);
        }

        wp->screen = &wp->base;
}

static void
window_pane_scrollbar_timer(__unused int fd, __unused short events, void *arg)
{
        struct window_pane      *wp = arg;

        wp->sb_auto_hover = 0;
        window_pane_scrollbar_hide(wp);
}

static int
window_pane_scrollbar_auto_hide(struct window_pane *wp)
{
        return (wp->window->sb == PANE_SCROLLBARS_MODAL ||
            wp->window->sb == PANE_SCROLLBARS_AUTOHIDE);
}

int
window_pane_scrollbar_overlay_visible(struct window_pane *wp)
{
        return (window_pane_scrollbar_overlay(wp) &&
            window_pane_scrollbar_visible(wp));
}

void
window_pane_scrollbar_redraw(struct window_pane *wp)
{
        if (window_pane_scrollbar_overlay_visible(wp)) {
                wp->flags |= PANE_REDRAW;
                return;
        }
        wp->flags |= PANE_REDRAWSCROLLBAR;
}

static void
window_pane_scrollbar_redraw_visibility(struct window_pane *wp)
{
        redraw_invalidate_scene(wp->window);
        wp->flags |= PANE_REDRAW;
        server_redraw_window(wp->window);
}

static void
window_pane_destroy(struct window_pane *wp)
{
        window_pane_wait_finish(wp);
        spawn_editor_finish(wp);

        RB_REMOVE(window_pane_tree, &all_window_panes, wp);
        wp->flags |= PANE_DESTROYED;
        window_pane_clear_prompt(wp);

        window_pane_free_modes(wp);
        screen_write_clear_dirty(wp);

        if (wp->fd != -1) {
                bufferevent_free(wp->event);
                wp->event = NULL;
                close(wp->fd);
                wp->fd = -1;
        }
        if (wp->ictx != NULL) {
                input_free(wp->ictx);
                wp->ictx = NULL;
        }

        if (wp->pipe_fd != -1) {
                bufferevent_free(wp->pipe_event);
                wp->pipe_event = NULL;
                close(wp->pipe_fd);
                wp->pipe_fd = -1;
        }

        if (event_initialized(&wp->resize_timer))
                event_del(&wp->resize_timer);
        if (event_initialized(&wp->sync_timer))
                event_del(&wp->sync_timer);
        if (event_initialized(&wp->sb_auto_timer))
                event_del(&wp->sb_auto_timer);
        window_pane_clear_resizes(wp, NULL);

        window_pane_remove_ref(wp, __func__);
}

static void
window_pane_free(struct window_pane *wp)
{
        log_debug("pane %%%u freed (%d references)", wp->id, wp->references);

        free(wp->searchstr);

        screen_free(&wp->status_screen);
        screen_free(&wp->base);

        options_free(wp->options);
        free((void *)wp->cwd);
        free(wp->shell);
        cmd_free_argv(wp->argc, wp->argv);
        colour_palette_free(&wp->palette);
        style_ranges_free(&wp->border_status_line.ranges);
        free(wp);
}

static void
window_pane_read_callback(__unused struct bufferevent *bufev, void *data)
{
        struct window_pane              *wp = data;
        struct evbuffer                 *evb = wp->event->input;
        struct window_pane_offset       *wpo = &wp->pipe_offset;
        size_t                           size = EVBUFFER_LENGTH(evb);
        char                            *new_data;
        size_t                           new_size;
        struct client                   *c;

        if (wp->pipe_fd != -1) {
                new_data = window_pane_get_new_data(wp, wpo, &new_size);
                if (new_size > 0) {
                        bufferevent_write(wp->pipe_event, new_data, new_size);
                        window_pane_update_used_data(wp, wpo, new_size);
                }
        }

        log_debug("%%%u has %zu bytes", wp->id, size);
        TAILQ_FOREACH(c, &clients, entry) {
                if (c->session != NULL && (c->flags & CLIENT_CONTROL))
                        control_write_output(c, wp);
        }
        input_parse_pane(wp);
        bufferevent_disable(wp->event, EV_READ);
}

static void
window_pane_error_callback(__unused struct bufferevent *bufev,
    __unused short what, void *data)
{
        struct window_pane *wp = data;

        log_debug("%%%u error", wp->id);
        wp->flags |= PANE_EXITED;

        if (window_pane_destroy_ready(wp))
                server_destroy_pane(wp, 1);
}

void
window_pane_set_event(struct window_pane *wp)
{
        setblocking(wp->fd, 0);

        wp->event = bufferevent_new(wp->fd, window_pane_read_callback,
            NULL, window_pane_error_callback, wp);
        if (wp->event == NULL)
                fatalx("out of memory");
        wp->ictx = input_init(wp, wp->event, &wp->palette, NULL);

        bufferevent_enable(wp->event, EV_READ|EV_WRITE);
}

void
window_pane_clear_resizes(struct window_pane *wp,
    struct window_pane_resize *except)
{
        struct window_pane_resize       *r, *r1;

        TAILQ_FOREACH_SAFE(r, &wp->resize_queue, entry, r1) {
                if (r == except)
                        continue;
                TAILQ_REMOVE(&wp->resize_queue, r, entry);
                free(r);
        }
}

void
window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
{
        struct window_mode_entry        *wme;
        struct window_pane_resize       *r;
        struct event_payload            *ep;
        struct cmd_find_state            fs;

        if (sx == wp->sx && sy == wp->sy)
                return;

        screen_write_stop_sync(wp);

        r = xmalloc(sizeof *r);
        r->sx = sx;
        r->sy = sy;
        r->osx = wp->sx;
        r->osy = wp->sy;
        TAILQ_INSERT_TAIL (&wp->resize_queue, r, entry);

        wp->sx = sx;
        wp->sy = sy;

        log_debug("%s: %%%u resize %ux%u", __func__, wp->id, sx, sy);
        screen_resize(&wp->base, sx, sy, wp->base.saved_grid == NULL);

        wme = TAILQ_FIRST(&wp->modes);
        if (wme != NULL && wme->mode->resize != NULL)
                wme->mode->resize(wme, sx, sy);

        ep = event_payload_create();
        cmd_find_from_pane(&fs, wp, 0);
        event_payload_set_target(ep, &fs);
        event_payload_set_pane(ep, "pane", wp);
        event_payload_set_window(ep, "window", wp->window);
        event_payload_set_uint(ep, "width", sx);
        event_payload_set_uint(ep, "height", sy);
        event_payload_set_uint(ep, "old_width", r->osx);
        event_payload_set_uint(ep, "old_height", r->osy);
        events_fire("pane-resized", ep);
}

int
window_pane_set_mode(struct window_pane *wp, struct window_pane *swp,
    const struct window_mode *mode, struct cmdq_item *item,
    struct cmd_find_state *fs, struct args *args)
{
        struct window_mode_entry        *wme;
        struct window                   *w = wp->window;
        const char                      *name = mode->name, *oname = NULL;

        if (!TAILQ_EMPTY(&wp->modes)) {
                if (TAILQ_FIRST(&wp->modes)->mode == mode)
                        return (1);
                if (TAILQ_FIRST(&wp->modes)->mode->flags & WINDOW_MODE_NO_STACK)
                        window_pane_reset_mode(wp);
        }
        if (!TAILQ_EMPTY(&wp->modes))
                oname = TAILQ_FIRST(&wp->modes)->mode->name;

        TAILQ_FOREACH(wme, &wp->modes, entry) {
                if (wme->mode == mode)
                        break;
        }
        if (wme != NULL) {
                TAILQ_REMOVE(&wp->modes, wme, entry);
                TAILQ_INSERT_HEAD(&wp->modes, wme, entry);
        } else {
                wme = xcalloc(1, sizeof *wme);
                wme->wp = wp;
                wme->swp = swp;
                wme->mode = mode;
                wme->prefix = 1;
                TAILQ_INSERT_HEAD(&wp->modes, wme, entry);
                wme->screen = wme->mode->init(wme, item, fs, args);
                if (wme->screen == NULL) {
                        TAILQ_REMOVE(&wp->modes, wme, entry);
                        free(wme);
                        return (1);
                }
        }
        wme->kill = args != NULL ? args_has(args, 'k') : 0;
        wp->screen = wme->screen;

        wp->flags |= (PANE_REDRAW|PANE_REDRAWSCROLLBAR|PANE_CHANGED);
        layout_fix_panes(w, NULL);

        server_redraw_window_borders(wp->window);
        server_status_window(wp->window);

        window_fire_pane_mode_changed("pane-mode-entered", wp, oname, name, 1);
        window_fire_pane_mode_changed("pane-mode-changed", wp, oname, name, 1);

        return (0);
}

void
window_pane_reset_mode(struct window_pane *wp)
{
        struct window_mode_entry        *wme, *next;
        struct window                   *w = wp->window;
        int                              kill;
        const char                      *name, *p;

        if (TAILQ_EMPTY(&wp->modes))
                return;

        wme = TAILQ_FIRST(&wp->modes);
        p = wme->mode->name;
        kill = wme->kill;
        TAILQ_REMOVE(&wp->modes, wme, entry);
        wme->mode->free(wme);
        free(wme);

        next = TAILQ_FIRST(&wp->modes);
        if (next == NULL) {
                wp->flags &= ~PANE_UNSEENCHANGES;
                log_debug("%s: no next mode", __func__);
                wp->screen = &wp->base;
        } else {
                log_debug("%s: next mode is %s", __func__, next->mode->name);
                wp->screen = next->screen;
                if (next->mode->resize != NULL)
                        next->mode->resize(next, wp->sx, wp->sy);
        }
        name = (next == NULL ? NULL : next->mode->name);

        wp->flags |= (PANE_REDRAW|PANE_REDRAWSCROLLBAR|PANE_CHANGED);
        layout_fix_panes(w, NULL);

        server_redraw_window_borders(wp->window);
        server_status_window(wp->window);

        window_fire_pane_mode_changed("pane-mode-exited", wp, p, name, 0);
        window_fire_pane_mode_changed("pane-mode-changed", wp, p, name, 0);

        if (kill)
                server_kill_pane(wp);
}

/* Reset all modes. */
void
window_pane_reset_mode_all(struct window_pane *wp)
{
        while (!TAILQ_EMPTY(&wp->modes))
                window_pane_reset_mode(wp);
}

/* Prompt input callback. */
static enum prompt_result
window_pane_prompt_input_callback(void *data, const char *s,
    enum prompt_key_result key)
{
        struct window_pane_prompt       *wpp = data;

        if (wpp->inputcb != NULL)
                return (wpp->inputcb(wpp->c, wpp->data, s, key));
        return (PROMPT_CLOSE);
}

/* Prompt free callback. */
static void
window_pane_prompt_free_callback(void *data)
{
        struct window_pane_prompt       *wpp = data;
        struct window_pane              *wp;

        wp = window_pane_find_by_id(wpp->wp_id);
        if (wp != NULL && wp->prompt_data == wpp)
                wp->prompt_data = NULL;
        if (wpp->freecb != NULL)
                wpp->freecb(wpp->data);
        free(wpp);
}

/* Open a prompt owned by a pane, drawn over the pane instead of the status. */
void
window_pane_set_prompt(struct window_pane *wp, struct client *c,
    struct cmd_find_state *fs, const char *msg, const char *input,
    status_prompt_input_cb inputcb, prompt_free_cb freecb, void *data,
    int flags, enum prompt_type type)
{
        struct session                  *s = NULL;
        struct prompt_create_data        pd;
        struct window_pane_prompt       *wpp;

        if (c != NULL)
                s = c->session;

        window_pane_clear_prompt(wp);

        wpp = xcalloc(1, sizeof *wpp);
        wpp->wp_id = wp->id;
        wpp->c = c;
        wpp->inputcb = inputcb;
        wpp->freecb = freecb;
        wpp->data = data;
        wpp->type = type;

        memset(&pd, 0, sizeof pd);
        prompt_set_options(&pd, s);
        pd.fs = fs;
        pd.prompt = msg;
        pd.input = input;
        pd.type = type;
        pd.flags = flags;
        pd.inputcb = window_pane_prompt_input_callback;
        pd.freecb = window_pane_prompt_free_callback;
        pd.data = wpp;

        wp->prompt = prompt_create(&pd);
        wp->prompt_data = wpp;
        wp->flags |= PANE_REDRAW;

        prompt_incremental_start(wp->prompt);
        window_fire_pane_prompt("pane-prompt-opened", wp, type);
}

/* Close a pane prompt. */
void
window_pane_clear_prompt(struct window_pane *wp)
{
        struct prompt                   *prompt = wp->prompt;
        struct window_pane_prompt       *wpp = wp->prompt_data;
        enum prompt_type                 type = PROMPT_TYPE_INVALID;

        if (prompt != NULL) {
                if (wpp != NULL)
                        type = wpp->type;

                wp->prompt = NULL;
                prompt_free(prompt);
                wp->flags |= PANE_REDRAW;

                if (~wp->flags & PANE_DESTROYED)
                        window_fire_pane_prompt("pane-prompt-closed", wp, type);
        }
}

/* Does this pane have an open prompt? */
int
window_pane_has_prompt(struct window_pane *wp)
{
        return (wp->prompt != NULL);
}

/* Replace the message and input of an open pane prompt. */
void
window_pane_update_prompt(struct window_pane *wp, const char *msg,
    const char *input)
{
        if (wp->prompt != NULL) {
                prompt_update(wp->prompt, msg, input);
                wp->flags |= PANE_REDRAW;
        }
}

/*
 * Pass a key to a pane prompt. The client is set transiently for the duration
 * of the key in case the prompt or pane is destroyed by the callback.
 */
enum prompt_key_result
window_pane_prompt_key(struct window_pane *wp, struct client *c, key_code key,
    struct mouse_event *m)
{
        struct prompt                   *prompt = wp->prompt;
        struct window_pane_prompt       *wpp = wp->prompt_data;
        enum prompt_key_result           result;
        u_int                            wp_id = wp->id, x, y, py;
        int                              redraw = 0;

        if (prompt == NULL)
                return (PROMPT_KEY_NOT_HANDLED);

        if (wpp != NULL)
                wpp->c = c;
        if (KEYC_IS_MOUSE(key)) {
                if (m == NULL ||
                    MOUSE_BUTTONS(m->b) != MOUSE_BUTTON_1 ||
                    MOUSE_DRAG(m->b) ||
                    MOUSE_RELEASE(m->b) ||
                    cmd_mouse_at(wp, m, &x, &y, 0) != 0)
                        result = PROMPT_KEY_NOT_HANDLED;
                else {
                        if (c != NULL && status_at_line(c) == 0)
                                py = 0;
                        else
                                py = wp->sy - 1;
                        if (y == py) {
                                result = prompt_mouse(prompt, x, 0, wp->sx,
                                    &redraw);
                        } else
                                result = PROMPT_KEY_NOT_HANDLED;
                }
        } else
                result = prompt_key(prompt, key, &redraw);

        wp = window_pane_find_by_id(wp_id);
        if (wp == NULL)
                return (result);
        if (wpp != NULL && wp->prompt_data == wpp)
                wpp->c = NULL;

        /*
         * Only an explicit close or the prompt marking itself closed ends it;
         * cursor movement and editing keep it open.
         */
        if (wp->prompt == prompt &&
            (result == PROMPT_KEY_CLOSE || prompt_closed(prompt)))
                window_pane_clear_prompt(wp);

        if (redraw || wp->prompt != prompt)
                wp->flags |= PANE_REDRAW;

        return (result);
}

static void
window_pane_copy_paste(struct window_pane *wp, char *buf, size_t len)
{
        struct window_pane      *loop;

        TAILQ_FOREACH(loop, &wp->window->panes, entry) {
                if (loop != wp &&
                    TAILQ_EMPTY(&loop->modes) &&
                    loop->fd != -1 &&
                    (~loop->flags & PANE_INPUTOFF) &&
                    window_pane_is_visible(loop) &&
                    options_get_number(loop->options, "synchronize-panes")) {
                        log_debug("%s: %.*s", __func__, (int)len, buf);
                        bufferevent_write(loop->event, buf, len);
                }
        }
}

static void
window_pane_copy_key(struct window_pane *wp, key_code key)
{
        struct window_pane      *loop;

        TAILQ_FOREACH(loop, &wp->window->panes, entry) {
                if (loop != wp &&
                    TAILQ_EMPTY(&loop->modes) &&
                    loop->fd != -1 &&
                    (~loop->flags & PANE_INPUTOFF) &&
                    window_pane_is_visible(loop) &&
                    options_get_number(loop->options, "synchronize-panes"))
                        input_key_pane(loop, key, NULL);
        }
}

void
window_pane_paste(struct window_pane *wp, key_code key, char *buf, size_t len)
{
        if (!TAILQ_EMPTY(&wp->modes))
                return;

        if (wp->fd == -1 || wp->flags & PANE_INPUTOFF)
                return;

        if (KEYC_IS_PASTE(key) && (~wp->screen->mode & MODE_BRACKETPASTE))
                return;

        log_debug("%s: %.*s", __func__, (int)len, buf);
        bufferevent_write(wp->event, buf, len);

        if (options_get_number(wp->options, "synchronize-panes"))
                window_pane_copy_paste(wp, buf, len);
}

int
window_pane_key(struct window_pane *wp, struct client *c, struct session *s,
    struct winlink *wl, key_code key, struct mouse_event *m)
{
        struct window_mode_entry        *wme;

        if (KEYC_IS_MOUSE(key) && m == NULL)
                return (-1);

        wme = TAILQ_FIRST(&wp->modes);
        if (wme != NULL) {
                /*
                 * No mode uses mouse motion events, so drop them here rather
                 * than passing them on and causing a redraw on every movement.
                 */
                if (KEYC_IS_TYPE(key, KEYC_TYPE_MOUSEMOVE))
                        return (0);
                if (wme->mode->key != NULL && c != NULL) {
                        key &= ~KEYC_MASK_FLAGS;
                        wme->mode->key(wme, c, s, wl, key, m);
                }
                return (0);
        }

        if (wp->fd == -1 || wp->flags & PANE_INPUTOFF)
                return (0);

        if (input_key_pane(wp, key, m) != 0)
                return (-1);

        if (KEYC_IS_MOUSE(key))
                return (0);
        if (options_get_number(wp->options, "synchronize-panes"))
                window_pane_copy_key(wp, key);
        return (0);
}

int
window_pane_is_visible(struct window_pane *wp)
{
        if (~wp->window->flags & WINDOW_ZOOMED)
                return (1);
        return (wp == wp->window->active);
}

int
window_pane_exited(struct window_pane *wp)
{
        return (wp->fd == -1 || (wp->flags & PANE_EXITED));
}

u_int
window_pane_search(struct window_pane *wp, const char *term, int regex,
    int ignore)
{
        struct screen   *s = &wp->base;
        regex_t          r;
        char            *new = NULL, *line;
        u_int            i;
        int              flags = 0, found;
        size_t           n;

        if (!regex) {
                if (ignore)
                        flags |= FNM_CASEFOLD;
                xasprintf(&new, "*%s*", term);
        } else {
                if (ignore)
                        flags |= REG_ICASE;
                if (regcomp(&r, term, flags|REG_EXTENDED) != 0)
                        return (0);
        }

        for (i = 0; i < screen_size_y(s); i++) {
                line = grid_view_string_cells(s->grid, 0, i, screen_size_x(s));
                for (n = strlen(line); n > 0; n--) {
                        if (!isspace((u_char)line[n - 1]))
                                break;
                        line[n - 1] = '\0';
                }
                log_debug("%s: %s", __func__, line);
                if (!regex)
                        found = (fnmatch(new, line, flags) == 0);
                else
                        found = (regexec(&r, line, 0, NULL, 0) == 0);
                free(line);
                if (found)
                        break;
        }
        if (!regex)
                free(new);
        else
                regfree(&r);

        if (i == screen_size_y(s))
                return (0);
        return (i + 1);
}

/* Get MRU pane from a list. */
static struct window_pane *
window_pane_choose_best(struct window_pane **list, u_int size)
{
        struct window_pane      *next, *best;
        u_int                    i;

        if (size == 0)
                return (NULL);

        best = list[0];
        for (i = 1; i < size; i++) {
                next = list[i];
                if (next->active_point > best->active_point)
                        best = next;
        }
        return (best);
}

/*
 * Get full size and offset of a window pane including the area of the
 * scrollbars if they were visible but not including the border(s).
 */
static void
window_pane_full_size_offset(struct window_pane *wp, int *xoff, int *yoff,
    u_int *sx, u_int *sy)
{
        struct window           *w = wp->window;
        u_int                    sb_w;

        if (window_pane_scrollbar_reserve(wp))
                sb_w = wp->scrollbar_style.width + wp->scrollbar_style.pad;
        else
                sb_w = 0;
        if (w->sb_pos == PANE_SCROLLBARS_LEFT) {
                *xoff = wp->xoff - sb_w;
                *sx = wp->sx + sb_w;
        } else { /* sb_pos == PANE_SCROLLBARS_RIGHT */
                *xoff = wp->xoff;
                *sx = wp->sx + sb_w;
        }
        *yoff = wp->yoff;
        *sy = wp->sy;
}

/*
 * Find the pane directly above another. We build a list of those adjacent to
 * top edge and then choose the best.
 */
struct window_pane *
window_pane_find_up(struct window_pane *wp)
{
        struct window           *w;
        struct window_pane      *next, *best, **list;
        int                      edge, left, right, end, status, found;
        int                      xoff, yoff;
        u_int                    size, sx, sy;

        if (wp == NULL)
                return (NULL);
        w = wp->window;
        status = window_get_pane_status(w);

        list = NULL;
        size = 0;

        window_pane_full_size_offset(wp, &xoff, &yoff, &sx, &sy);

        edge = yoff;
        if (status == PANE_STATUS_TOP) {
                if (edge == 1)
                        edge = (int)w->sy + 1;
        } else if (status == PANE_STATUS_BOTTOM) {
                if (edge == 0)
                        edge = (int)w->sy;
        } else {
                if (edge == 0)
                        edge = (int)w->sy + 1;
        }

        left = xoff;
        right = xoff + (int)sx;

        TAILQ_FOREACH(next, &w->panes, entry) {
                window_pane_full_size_offset(next, &xoff, &yoff, &sx, &sy);
                if (next == wp)
                        continue;
                if (yoff + (int)sy + 1 != edge)
                        continue;
                end = xoff + (int)sx - 1;

                found = 0;
                if (xoff < left && end > right)
                        found = 1;
                else if (xoff >= left && xoff <= right)
                        found = 1;
                else if (end >= left && end <= right)
                        found = 1;
                if (!found)
                        continue;
                list = xreallocarray(list, size + 1, sizeof *list);
                list[size++] = next;
        }

        best = window_pane_choose_best(list, size);
        free(list);
        return (best);
}

/* Find the pane directly below another. */
struct window_pane *
window_pane_find_down(struct window_pane *wp)
{
        struct window           *w;
        struct window_pane      *next, *best, **list;
        int                      edge, left, right, end, status, found;
        int                      xoff, yoff;
        u_int                    size, sx, sy;

        if (wp == NULL)
                return (NULL);
        w = wp->window;
        status = window_get_pane_status(w);

        list = NULL;
        size = 0;

        window_pane_full_size_offset(wp, &xoff, &yoff, &sx, &sy);

        edge = yoff + (int)sy + 1;
        if (status == PANE_STATUS_TOP) {
                if (edge >= (int)w->sy)
                        edge = 1;
        } else if (status == PANE_STATUS_BOTTOM) {
                if (edge >= (int)w->sy - 1)
                        edge = 0;
        } else {
                if (edge >= (int)w->sy)
                        edge = 0;
        }

        left = wp->xoff;
        right = wp->xoff + (int)wp->sx;

        TAILQ_FOREACH(next, &w->panes, entry) {
                window_pane_full_size_offset(next, &xoff, &yoff, &sx, &sy);
                if (next == wp)
                        continue;
                if (yoff != edge)
                        continue;
                end = xoff + (int)sx - 1;

                found = 0;
                if (xoff < left && end > right)
                        found = 1;
                else if (xoff >= left && xoff <= right)
                        found = 1;
                else if (end >= left && end <= right)
                        found = 1;
                if (!found)
                        continue;
                list = xreallocarray(list, size + 1, sizeof *list);
                list[size++] = next;
        }

        best = window_pane_choose_best(list, size);
        free(list);
        return (best);
}

/* Find the pane directly to the left of another. */
struct window_pane *
window_pane_find_left(struct window_pane *wp)
{
        struct window           *w;
        struct window_pane      *next, *best, **list;
        int                      edge, top, bottom, end, found;
        int                      xoff, yoff;
        u_int                    size, sx, sy;

        if (wp == NULL)
                return (NULL);
        w = wp->window;

        list = NULL;
        size = 0;

        window_pane_full_size_offset(wp, &xoff, &yoff, &sx, &sy);

        edge = xoff;
        if (edge == 0)
                edge = (int)w->sx + 1;

        top = yoff;
        bottom = yoff + (int)sy;

        TAILQ_FOREACH(next, &w->panes, entry) {
                window_pane_full_size_offset(next, &xoff, &yoff, &sx, &sy);
                if (next == wp)
                        continue;
                if (xoff + (int)sx + 1 != edge)
                        continue;
                end = yoff + (int)sy - 1;

                found = 0;
                if (yoff < top && end > bottom)
                        found = 1;
                else if (yoff >= top && yoff <= bottom)
                        found = 1;
                else if (end >= top && end <= bottom)
                        found = 1;
                if (!found)
                        continue;
                list = xreallocarray(list, size + 1, sizeof *list);
                list[size++] = next;
        }

        best = window_pane_choose_best(list, size);
        free(list);
        return (best);
}

/* Find the pane directly to the right of another. */
struct window_pane *
window_pane_find_right(struct window_pane *wp)
{
        struct window           *w;
        struct window_pane      *next, *best, **list;
        int                      edge, top, bottom, end, found;
        int                      xoff, yoff;
        u_int                    size, sx, sy;

        if (wp == NULL)
                return (NULL);
        w = wp->window;

        list = NULL;
        size = 0;

        window_pane_full_size_offset(wp, &xoff, &yoff, &sx, &sy);

        edge = xoff + (int)sx + 1;
        if (edge >= (int)w->sx)
                edge = 0;

        top = wp->yoff;
        bottom = wp->yoff + (int)wp->sy;

        TAILQ_FOREACH(next, &w->panes, entry) {
                window_pane_full_size_offset(next, &xoff, &yoff, &sx, &sy);
                if (next == wp)
                        continue;
                if (xoff != edge)
                        continue;
                end = yoff + (int)sy - 1;

                found = 0;
                if (yoff < top && end > bottom)
                        found = 1;
                else if (yoff >= top && yoff <= bottom)
                        found = 1;
                else if (end >= top && end <= bottom)
                        found = 1;
                if (!found)
                        continue;
                list = xreallocarray(list, size + 1, sizeof *list);
                list[size++] = next;
        }

        best = window_pane_choose_best(list, size);
        free(list);
        return (best);
}

/* Add window to stack. */
void
window_pane_stack_push(struct window_panes *stack, struct window_pane *wp)
{
        if (wp != NULL) {
                window_pane_stack_remove(stack, wp);
                TAILQ_INSERT_HEAD(stack, wp, sentry);
                wp->flags |= PANE_VISITED;
        }
}

/* Remove window from stack. */
void
window_pane_stack_remove(struct window_panes *stack, struct window_pane *wp)
{
        if (wp != NULL && (wp->flags & PANE_VISITED)) {
                TAILQ_REMOVE(stack, wp, sentry);
                wp->flags &= ~PANE_VISITED;
        }
}

/* Clear alert flags for a winlink */
void
winlink_clear_flags(struct winlink *wl)
{
        struct winlink  *loop;

        wl->window->flags &= ~WINDOW_ALERTFLAGS;
        TAILQ_FOREACH(loop, &wl->window->winlinks, wentry) {
                if ((loop->flags & WINLINK_ALERTFLAGS) != 0) {
                        loop->flags &= ~WINLINK_ALERTFLAGS;
                        server_status_session(loop->session);
                }
        }
}

/* Shuffle window indexes up. */
int
winlink_shuffle_up(struct session *s, struct winlink *wl, int before)
{
        int      idx, last;

        if (wl == NULL)
                return (-1);
        if (before)
                idx = wl->idx;
        else
                idx = wl->idx + 1;

        /* Find the next free index. */
        for (last = idx; last < INT_MAX; last++) {
                if (winlink_find_by_index(&s->windows, last) == NULL)
                        break;
        }
        if (last == INT_MAX)
                return (-1);

        /* Move everything from last - 1 to idx up a bit. */
        for (; last > idx; last--) {
                wl = winlink_find_by_index(&s->windows, last - 1);
                RB_REMOVE(winlinks, &s->windows, wl);
                wl->idx++;
                RB_INSERT(winlinks, &s->windows, wl);
        }

        return (idx);
}

static void
window_pane_input_callback(struct client *c, __unused const char *path,
    int error, int closed, struct evbuffer *buffer, void *data)
{
        struct window_pane_input_data   *cdata = data;
        struct window_pane              *wp;
        u_char                          *buf = EVBUFFER_DATA(buffer);
        size_t                           len = EVBUFFER_LENGTH(buffer);

        wp = window_pane_find_by_id(cdata->wp);
        if (cdata->file != NULL && (wp == NULL || c->flags & CLIENT_DEAD)) {
                if (wp == NULL) {
                        c->retval = 1;
                        c->flags |= CLIENT_EXIT;
                }
                file_cancel(cdata->file);
        } else if (cdata->file == NULL || closed || error != 0) {
                cmdq_continue(cdata->item);
                server_client_unref(c);
                free(cdata);
        } else
                input_parse_buffer(wp, buf, len);
        evbuffer_drain(buffer, len);
}

int
window_pane_start_input(struct window_pane *wp, struct cmdq_item *item,
    char **cause)
{
        struct client                   *c = cmdq_get_client(item);
        struct window_pane_input_data   *cdata;

        if (~wp->flags & PANE_EMPTY) {
                *cause = xstrdup("pane is not empty");
                return (-1);
        }
        if (c->flags & (CLIENT_DEAD|CLIENT_EXITED))
                return (1);
        if (c->session != NULL)
                return (1);

        cdata = xmalloc(sizeof *cdata);
        cdata->item = item;
        cdata->wp = wp->id;
        cdata->file = file_read(c, "-", window_pane_input_callback, cdata);
        c->references++;

        return (0);
}

void *
window_pane_get_new_data(struct window_pane *wp,
    struct window_pane_offset *wpo, size_t *size)
{
        size_t  used = wpo->used - wp->base_offset;

        *size = EVBUFFER_LENGTH(wp->event->input) - used;
        return (EVBUFFER_DATA(wp->event->input) + used);
}

void
window_pane_update_used_data(struct window_pane *wp,
    struct window_pane_offset *wpo, size_t size)
{
        size_t  used = wpo->used - wp->base_offset;

        if (size > EVBUFFER_LENGTH(wp->event->input) - used)
                size = EVBUFFER_LENGTH(wp->event->input) - used;
        wpo->used += size;
}

void
window_pane_default_cursor(struct window_pane *wp)
{
        screen_set_default_cursor(wp->screen, wp->options);
}

int
window_pane_mode(struct window_pane *wp)
{
        if (TAILQ_FIRST(&wp->modes) != NULL) {
                if (TAILQ_FIRST(&wp->modes)->mode == &window_copy_mode)
                        return (WINDOW_PANE_COPY_MODE);
                if (TAILQ_FIRST(&wp->modes)->mode == &window_view_mode)
                        return (WINDOW_PANE_VIEW_MODE);
        }
        return (WINDOW_PANE_NO_MODE);
}

int
window_pane_show_scrollbar(struct window_pane *wp)
{
        struct window                   *w = wp->window;
        struct window_mode_entry        *wme;

        if (SCREEN_IS_ALTERNATE(&wp->base))
                return (0);
        if ((w->flags & WINDOW_ZOOMED) && w->active != NULL) {
                wme = TAILQ_FIRST(&w->active->modes);
                if (wme != NULL &&
                    (wme->mode->flags & WINDOW_MODE_HIDE_SCROLLBARS)) {
                        return (0);
                }
        }
        if (w->sb == PANE_SCROLLBARS_ALWAYS ||
            w->sb == PANE_SCROLLBARS_AUTOHIDE ||
            (w->sb == PANE_SCROLLBARS_MODAL &&
            window_pane_mode(wp) != WINDOW_PANE_NO_MODE))
                return (1);
        return (0);
}

int
window_pane_scrollbar_reserve(struct window_pane *wp)
{
        if (!window_pane_show_scrollbar(wp))
                return (0);
        return (wp->window->sb == PANE_SCROLLBARS_ALWAYS);
}

int
window_pane_scrollbar_overlay(struct window_pane *wp)
{
        if (!window_pane_show_scrollbar(wp))
                return (0);
        return (window_pane_scrollbar_auto_hide(wp));
}

int
window_pane_scrollbar_visible(struct window_pane *wp)
{
        if (!window_pane_show_scrollbar(wp))
                return (0);
        if (!window_pane_scrollbar_auto_hide(wp))
                return (1);
        return (wp->sb_auto_visible);
}

void
window_pane_scrollbar_start_timer(struct window_pane *wp)
{
        struct timeval  tv;
        u_int           delay;

        if (!window_pane_scrollbar_auto_hide(wp) || !wp->sb_auto_visible)
                return;

        delay = options_get_number(wp->window->options,
            "pane-scrollbars-timeout");
        tv.tv_sec = delay / 1000;
        tv.tv_usec = (delay % 1000) * 1000L;
        evtimer_del(&wp->sb_auto_timer);
        evtimer_add(&wp->sb_auto_timer, &tv);
}

void
window_pane_scrollbar_show(struct window_pane *wp, int start_timer)
{
        int     changed = 0;
        if (!window_pane_scrollbar_auto_hide(wp))
                return;
        if (!window_pane_show_scrollbar(wp))
                return;
        if (!wp->sb_auto_visible) {
                wp->sb_auto_visible = 1;
                changed = 1;
        }
        evtimer_del(&wp->sb_auto_timer);
        if (start_timer)
                window_pane_scrollbar_start_timer(wp);
        if (changed)
                window_pane_scrollbar_redraw_visibility(wp);
}

void
window_pane_scrollbar_hide(struct window_pane *wp)
{
        if (event_initialized(&wp->sb_auto_timer))
                evtimer_del(&wp->sb_auto_timer);
        wp->sb_auto_hover = 0;
        if (!wp->sb_auto_visible)
                return;
        wp->sb_auto_visible = 0;
        window_pane_scrollbar_redraw_visibility(wp);
}

int
window_pane_get_bg(struct window_pane *wp)
{
        int                     c;
        struct grid_cell        defaults;

        c = window_pane_get_bg_control_client(wp);
        if (c == -1) {
                tty_default_colours(&defaults, wp, NULL);
                if (COLOUR_DEFAULT(defaults.bg))
                        c = window_get_bg_client(wp);
                else
                        c = defaults.bg;
        }
        return (c);
}

/* Get a client with a background for the pane. */
int
window_get_bg_client(struct window_pane *wp)
{
        struct window   *w = wp->window;
        struct client   *loop;

        TAILQ_FOREACH(loop, &clients, entry) {
                if (loop->flags & CLIENT_UNATTACHEDFLAGS)
                        continue;
                if (loop->session == NULL || !session_has(loop->session, w))
                        continue;
                if (loop->tty.bg == -1)
                        continue;
                return (loop->tty.bg);
        }
        return (-1);
}

/*
 * If any control mode client exists that has provided a bg color, return it.
 * Otherwise, return -1.
 */
int
window_pane_get_bg_control_client(struct window_pane *wp)
{
        struct client   *c;

        if (wp->control_bg == -1)
                return (-1);

        TAILQ_FOREACH(c, &clients, entry) {
                if (c->flags & CLIENT_CONTROL)
                        return (wp->control_bg);
        }
        return (-1);
}

/*
 * Get a client with a foreground for the pane. There isn't much to choose
 * between them so just use the first.
 */
int
window_pane_get_fg(struct window_pane *wp)
{
        struct window   *w = wp->window;
        struct client   *loop;

        TAILQ_FOREACH(loop, &clients, entry) {
                if (loop->flags & CLIENT_UNATTACHEDFLAGS)
                        continue;
                if (loop->session == NULL || !session_has(loop->session, w))
                        continue;
                if (loop->tty.fg == -1)
                        continue;
                return (loop->tty.fg);
        }
        return (-1);
}

/*
 * If any control mode client exists that has provided a fg color, return it.
 * Otherwise, return -1.
 */
int
window_pane_get_fg_control_client(struct window_pane *wp)
{
        struct client   *c;

        if (wp->control_fg == -1)
                return (-1);

        TAILQ_FOREACH(c, &clients, entry) {
                if (c->flags & CLIENT_CONTROL)
                        return (wp->control_fg);
        }
        return (-1);
}

enum client_theme
window_pane_get_theme(struct window_pane *wp)
{
        struct window           *w;
        struct client           *loop;
        int                      found_light = 0, found_dark = 0;

        if (wp == NULL)
                return (THEME_UNKNOWN);
        w = wp->window;

        /*
         * Prefer a theme reported by an attached client with mode 2031 or DSR
         * 996: the terminal knows its own light or dark mode.
         */
        TAILQ_FOREACH(loop, &clients, entry) {
                if (loop->flags & CLIENT_UNATTACHEDFLAGS)
                        continue;
                if (loop->session == NULL || !session_has(loop->session, w))
                        continue;
                switch (loop->theme) {
                case THEME_LIGHT:
                        found_light = 1;
                        break;
                case THEME_DARK:
                        found_dark = 1;
                        break;
                case THEME_UNKNOWN:
                        break;
                }
        }
        if (found_dark && !found_light)
                return (THEME_DARK);
        if (found_light && !found_dark)
                return (THEME_LIGHT);

        /*
         * Otherwise guess from the pane background colour, for terminals which
         * do not report a theme themselves.
         */
        return (colour_totheme(window_pane_get_bg(wp)));
}

void
window_pane_send_theme_update(struct window_pane *wp)
{
        enum client_theme       theme;

        if (wp == NULL || window_pane_exited(wp))
                return;
        if (~wp->flags & PANE_THEMECHANGED)
                return;
        if (~wp->screen->mode & MODE_THEME_UPDATES)
                return;

        theme = window_pane_get_theme(wp);
        if (theme == wp->last_theme)
                return;
        wp->last_theme = theme;
        wp->flags &= ~PANE_THEMECHANGED;

        switch (theme) {
        case THEME_LIGHT:
                log_debug("%s: %%%u light theme", __func__, wp->id);
                bufferevent_write(wp->event, "\033[?997;2n", 9);
                break;
        case THEME_DARK:
                log_debug("%s: %%%u dark theme", __func__, wp->id);
                bufferevent_write(wp->event, "\033[?997;1n", 9);
                break;
        case THEME_UNKNOWN:
                log_debug("%s: %%%u unknown theme", __func__, wp->id);
                break;
        }
}

struct style_range *
window_pane_status_get_range(struct window_pane *wp, u_int x, u_int y)
{
        struct style_ranges     *srs;
        u_int                    line;
        int                      pane_status;

        if (wp == NULL)
                return (NULL);
        srs = &wp->border_status_line.ranges;

        pane_status = window_pane_get_pane_status(wp);
        if (pane_status == PANE_STATUS_TOP)
                line = wp->yoff - 1;
        else if (pane_status == PANE_STATUS_BOTTOM)
                line = wp->yoff + wp->sy;
        if (pane_status == PANE_STATUS_OFF || line != y)
                return (NULL);

        /*
         * The border formats start 2 off but that isn't reflected in
         * the stored bounds of the range.
         */
        return (style_ranges_get_range(srs, x - wp->xoff - 2));
}

enum pane_lines
window_get_pane_lines(struct window *w)
{
        struct options  *oo;

        oo = w->options;
        return (options_get_number(oo, "pane-border-lines"));
}

enum pane_lines
window_pane_get_pane_lines(struct window_pane *wp)
{
        struct options  *oo;

        if (!window_pane_is_floating(wp))
                oo = wp->window->options;
        else
                oo = wp->options;
        return (options_get_number(oo, "pane-border-lines"));
}

int
window_get_pane_status(struct window *w)
{
        int     status;

        status = options_get_number(w->options, "pane-border-status");
        if (status == PANE_STATUS_TOP_FLOATING ||
            status == PANE_STATUS_BOTTOM_FLOATING)
                return (PANE_STATUS_OFF);
        return (status);
}

int
window_pane_get_pane_status(struct window_pane *wp)
{
        struct window_mode_entry        *wme;
        int     status;

        wme = TAILQ_FIRST(&wp->modes);
        if (wme != NULL &&
            (wme->mode->flags & WINDOW_MODE_HIDE_PANE_STATUS) &&
            (wp->flags & PANE_ZOOMED))
                return (PANE_STATUS_OFF);

        if (!window_pane_is_floating(wp))
                return (window_get_pane_status(wp->window));
        if (window_pane_get_pane_lines(wp) == PANE_LINES_NONE)
                return (PANE_STATUS_OFF);

        status = options_get_number(wp->options, "pane-border-status");
        if (status == PANE_STATUS_TOP_FLOATING)
                return (PANE_STATUS_TOP);
        if (status == PANE_STATUS_BOTTOM_FLOATING)
                return (PANE_STATUS_BOTTOM);
        return (status);
}

int
window_pane_is_floating(struct window_pane *wp)
{
        struct layout_cell      *lc = wp->layout_cell;

        if (lc == NULL || (lc->flags & LAYOUT_CELL_FLOATING) == 0)
                return (0);
        return (1);
}