/* $OpenBSD: cmd-resize-pane.c,v 1.67 2026/07/10 13:38:45 nicm Exp $ */

/*
 * Copyright (c) 2009 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 <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Increase or decrease pane size.
 */

static enum cmd_retval  cmd_resize_pane_exec(struct cmd *, struct cmdq_item *);

static enum cmd_retval  cmd_resize_pane_mouse_update(struct cmd *,
                            struct cmdq_item *);
static void             cmd_resize_pane_mouse_resize_move_floating(
                            struct client *, struct mouse_event *);
static void             cmd_resize_pane_mouse_resize_tiled(struct client *,
                            struct mouse_event *);

const struct cmd_entry cmd_resize_pane_entry = {
        .name = "resize-pane",
        .alias = "resizep",

        .args = { "D::L::MR::Tt:U::x:y:Z", 0, 1, NULL },
        .usage = "[-MTZ] [-D lines] [-L columns] [-R columns] [-U lines] "
                 "[-x width] [-y height] " CMD_TARGET_PANE_USAGE,

        .target = { 't', CMD_FIND_PANE, 0 },

        .flags = CMD_AFTERHOOK,
        .exec = cmd_resize_pane_exec
};

static enum cmd_retval
cmd_resize_pane_exec(struct cmd *self, struct cmdq_item *item)
{
        struct args             *args = cmd_get_args(self);
        struct cmd_find_state   *target = cmdq_get_target(item);
        struct window_pane      *wp = target->wp;
        struct winlink          *wl = target->wl;
        struct window           *w = wl->window;
        struct layout_cell      *lc = wp->layout_cell;
        enum layout_type         type;
        const char              *errstr, *argval;
        const char               flags[4] = { 'U', 'D', 'L', 'R' };
        char                    *cause = NULL, flag;
        int                      adjust, x, y, status, opposite = 0;
        long unsigned            i;
        struct grid             *gd = wp->base.grid;

        if (args_has(args, 'T')) {
                if (!TAILQ_EMPTY(&wp->modes))
                        return (CMD_RETURN_NORMAL);
                adjust = screen_size_y(&wp->base) - 1 - wp->base.cy;
                if (adjust > (int)gd->hsize)
                        adjust = gd->hsize;
                grid_remove_history(gd, adjust);
                wp->base.cy += adjust;
                wp->flags |= PANE_REDRAW;
                return (CMD_RETURN_NORMAL);
        }

        if (args_has(args, 'M'))
                return (cmd_resize_pane_mouse_update(self, item));

        if (args_has(args, 'Z')) {
                if (w->flags & WINDOW_ZOOMED)
                        window_unzoom(w, 1);
                else
                        window_zoom(wp);
                server_redraw_window(w);
                return (CMD_RETURN_NORMAL);
        }
        server_unzoom_window(w);

        if (args_has(args, 'x')) {
                x = args_percentage(args, 'x', 0, PANE_MAXIMUM, w->sx, &cause);
                if (cause != NULL) {
                        cmdq_error(item, "width %s", cause);
                        free(cause);
                        return (CMD_RETURN_ERROR);
                }
                if (window_pane_is_floating(wp)) {
                        if (layout_resize_floating_pane_to(wp, LAYOUT_LEFTRIGHT,
                            x, &cause) != 0) {
                                cmdq_error(item, "size %s", cause);
                                free(cause);
                                return (CMD_RETURN_ERROR);
                        }
                } else
                        layout_resize_pane_to(wp, LAYOUT_LEFTRIGHT, x);
        }
        if (args_has(args, 'y')) {
                y = args_percentage(args, 'y', 0, PANE_MAXIMUM, w->sy, &cause);
                if (cause != NULL) {
                        cmdq_error(item, "height %s", cause);
                        free(cause);
                        return (CMD_RETURN_ERROR);
                }
                status = window_get_pane_status(w);
                switch (status) {
                case PANE_STATUS_TOP:
                        if (y != INT_MAX && wp->yoff == 1)
                                y++;
                        break;
                case PANE_STATUS_BOTTOM:
                        if (y != INT_MAX && wp->yoff + wp->sy == w->sy - 1)
                                y++;
                        break;
                }
                if (window_pane_is_floating(wp)) {
                        if (layout_resize_floating_pane_to(wp, LAYOUT_TOPBOTTOM,
                            y, &cause) != 0) {
                                cmdq_error(item, "size %s", cause);
                                free(cause);
                                return (CMD_RETURN_ERROR);
                        }
                } else
                        layout_resize_pane_to(wp, LAYOUT_TOPBOTTOM, y);
        }

        for (i = 0; i < nitems(flags); i++) {
                flag = flags[i];
                if (!args_has(args, flag))
                        continue;

                argval = args_get(args, flag);
                if (argval == NULL) {
                        if (args_count(args) == 0)
                                argval = "1";
                        else
                                argval = args_string(args, 0);
                }

                adjust = strtonum(argval, INT_MIN, INT_MAX, &errstr);
                if (errstr != NULL) {
                        cmdq_error(item, "adjustment %s", errstr);
                        return (CMD_RETURN_ERROR);
                }

                type = LAYOUT_TOPBOTTOM;
                if (flag == 'L' || flag == 'R')
                        type = LAYOUT_LEFTRIGHT;

                if (window_pane_is_floating(wp)) {
                        if (flag == 'L' || flag == 'U')
                                opposite = 1;

                        if (layout_resize_floating_pane(wp, type, adjust,
                            opposite, &cause) != 0) {
                                cmdq_error(item, "adjustment %s", cause);
                                free(cause);
                                return (CMD_RETURN_ERROR);
                        }
                } else {
                        if (flag == 'L' || flag == 'U')
                                adjust = -adjust;
                        layout_resize_pane(wp, type, adjust, 1);
                }
        }

        if (lc->parent != NULL)
                layout_fix_offsets(w);
        layout_fix_panes(w, NULL);
        events_fire_window("window-layout-changed", w);
        server_redraw_window(w);

        return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_resize_pane_mouse_update(__unused struct cmd *self, struct cmdq_item *item)
{
        struct cmd_find_state   *target = cmdq_get_target(item);
        struct key_event        *event = cmdq_get_event(item);
        struct window_pane      *wp = target->wp;
        struct winlink          *wl = target->wl;
        struct window           *w = wl->window;
        struct client           *c = cmdq_get_client(item);
        struct session          *s = target->s;

        if (!event->m.valid)
                return (CMD_RETURN_NORMAL);
        wp = cmd_mouse_pane(&event->m, &s, NULL);
        if (wp == NULL || c == NULL || c->session != s)
                return (CMD_RETURN_NORMAL);

        if (!window_pane_is_floating(wp)) {
                c->tty.mouse_drag_update = cmd_resize_pane_mouse_resize_tiled;
                cmd_resize_pane_mouse_resize_tiled(c, &event->m);
                return (CMD_RETURN_NORMAL);
        }

        window_redraw_active_switch(w, wp);
        window_set_active_pane(w, wp, 1);

        c->tty.mouse_drag_update = cmd_resize_pane_mouse_resize_move_floating;
        cmd_resize_pane_mouse_resize_move_floating(c, &event->m);
        return (CMD_RETURN_NORMAL);
}

/*
 * Resizes or moves the pane by dragging. Resize a floating pane by dragging
 * the borders or corners. Grabbing an edge only resizes that axis (special
 * case). Moves the pane if dragging the top border. Since characters are
 * generally rectangular, to make it easier to grab the corner, the character
 * next to the corner is also considered the corner.
 */
static void
cmd_resize_pane_mouse_resize_move_floating(struct client *c,
    struct mouse_event *m)
{
        struct winlink          *wl;
        struct window           *w;
        struct window_pane      *wp;
        struct layout_cell      *lc;
        int                      y, ly, x, lx, sx, sy, new_sx, new_sy;
        int                      left, right;
        int                      new_xoff, new_yoff, resizes = 0;

        wp = cmd_mouse_pane(m, NULL, &wl);
        if (wp == NULL) {
                c->tty.mouse_drag_update = NULL;
                return;
        }
        w = wl->window;
        lc = wp->layout_cell;
        sx = wp->sx;
        sy = wp->sy;
        left = wp->xoff - 1;
        right = wp->xoff + sx;
        if (window_pane_scrollbar_reserve(wp) &&
            w->sb_pos == PANE_SCROLLBARS_LEFT) {
                left -= wp->scrollbar_style.width + wp->scrollbar_style.pad;
        } else if (window_pane_scrollbar_reserve(wp) &&
            w->sb_pos == PANE_SCROLLBARS_RIGHT) {
                right += wp->scrollbar_style.width + wp->scrollbar_style.pad;
        }

        y = m->y + m->oy; x = m->x + m->ox;
        if (m->statusat == 0 && y >= (int)m->statuslines)
                y -= m->statuslines;
        else if (m->statusat > 0 && y >= m->statusat)
                y = m->statusat - 1;
        ly = m->ly + m->oy; lx = m->lx + m->ox;
        if (m->statusat == 0 && ly >= (int)m->statuslines)
                ly -= m->statuslines;
        else if (m->statusat > 0 && ly >= m->statusat)
                ly = m->statusat - 1;

        if ((lx == left || lx == left + 1) && ly == wp->yoff - 1) {
                /* Top left corner. */
                new_sx = lc->g.sx + (lx - x);
                if (new_sx < PANE_MINIMUM)
                        new_sx = PANE_MINIMUM;
                new_sy = lc->g.sy + (ly - y);
                if (new_sy < PANE_MINIMUM)
                        new_sy = PANE_MINIMUM;
                new_xoff = x + 1; /* because mouse is on border at xoff - 1 */
                new_yoff = y + 1;
                layout_set_size(lc, new_sx, new_sy, new_xoff, new_yoff);
                resizes++;
        } else if ((lx == right + 1 || lx == right) &&
            ly == wp->yoff - 1) {
                /* Top right corner. */
                new_sx = x - lc->g.xoff;
                if (new_sx < PANE_MINIMUM)
                        new_sx = PANE_MINIMUM;
                new_sy = lc->g.sy + (ly - y);
                if (new_sy < PANE_MINIMUM)
                        new_sy = PANE_MINIMUM;
                new_yoff = y + 1;
                layout_set_size(lc, new_sx, new_sy, lc->g.xoff, new_yoff);
                resizes++;
        } else if ((lx == left || lx == left + 1) &&
            ly == wp->yoff + sy) {
                /* Bottom left corner. */
                new_sx = lc->g.sx + (lx - x);
                if (new_sx < PANE_MINIMUM)
                        new_sx = PANE_MINIMUM;
                new_sy = y - lc->g.yoff;
                if (new_sy < PANE_MINIMUM)
                        return;
                new_xoff = x + 1;
                layout_set_size(lc, new_sx, new_sy, new_xoff, lc->g.yoff);
                resizes++;
        } else if ((lx == right + 1 || lx == right) &&
            ly == wp->yoff + sy) {
                /* Bottom right corner. */
                new_sx = x - lc->g.xoff;
                if (new_sx < PANE_MINIMUM)
                        new_sx = PANE_MINIMUM;
                new_sy = y - lc->g.yoff;
                if (new_sy < PANE_MINIMUM)
                        new_sy = PANE_MINIMUM;
                layout_set_size(lc, new_sx, new_sy, lc->g.xoff, lc->g.yoff);
                resizes++;
        } else if (lx == right) {
                /* Right border. */
                new_sx = x - lc->g.xoff;
                if (new_sx < PANE_MINIMUM)
                        return;
                layout_set_size(lc, new_sx, lc->g.sy, lc->g.xoff, lc->g.yoff);
                resizes++;
        } else if (lx == left) {
                /* Left border. */
                new_sx = lc->g.sx + (lx - x);
                if (new_sx < PANE_MINIMUM)
                        return;
                new_xoff = x + 1;
                layout_set_size(lc, new_sx, lc->g.sy, new_xoff, lc->g.yoff);
                resizes++;
        } else if (ly == wp->yoff + sy) {
                /* Bottom border. */
                new_sy = y - lc->g.yoff;
                if (new_sy < PANE_MINIMUM)
                        return;
                layout_set_size(lc, lc->g.sx, new_sy, lc->g.xoff, lc->g.yoff);
                resizes++;
        } else if (ly == wp->yoff - 1) {
                /* Top border (move instead of resize). */
                new_xoff = lc->g.xoff + (x - lx);
                new_yoff = y + 1;
                layout_set_size(lc, lc->g.sx, lc->g.sy, new_xoff, new_yoff);
                resizes++;
        }
        if (resizes != 0) {
                layout_fix_panes(w, NULL);
                server_redraw_window(w);
                server_redraw_window_borders(w);
        }
}

static void
cmd_resize_pane_mouse_resize_tiled(struct client *c, struct mouse_event *m)
{
        struct winlink          *wl;
        struct window           *w;
        u_int                    y, ly, x, lx;
        static const int         offsets[][2] = {
            { 0, 0 }, { 0, 1 }, { 1, 0 }, { 0, -1 }, { -1, 0 },
        };
        struct layout_cell      *cells[nitems(offsets)], *lc;
        u_int                    ncells = 0, i, j, resizes = 0;
        enum layout_type         type;

        wl = cmd_mouse_window(m, NULL);
        if (wl == NULL) {
                c->tty.mouse_drag_update = NULL;
                return;
        }
        w = wl->window;

        y = m->y + m->oy; x = m->x + m->ox;
        if (m->statusat == 0 && y >= m->statuslines)
                y -= m->statuslines;
        else if (m->statusat > 0 && y >= (u_int)m->statusat)
                y = m->statusat - 1;
        ly = m->ly + m->oy; lx = m->lx + m->ox;
        if (m->statusat == 0 && ly >= m->statuslines)
                ly -= m->statuslines;
        else if (m->statusat > 0 && ly >= (u_int)m->statusat)
                ly = m->statusat - 1;

        for (i = 0; i < nitems(cells); i++) {
                lc = layout_search_by_border(w->layout_root, lx + offsets[i][0],
                    ly + offsets[i][1]);
                if (lc == NULL)
                        continue;

                for (j = 0; j < ncells; j++) {
                        if (cells[j] == lc) {
                                lc = NULL;
                                break;
                        }
                }
                if (lc == NULL)
                        continue;

                cells[ncells] = lc;
                ncells++;
        }
        if (ncells == 0)
                return;

        for (i = 0; i < ncells; i++) {
                type = cells[i]->parent->type;
                if (y != ly && type == LAYOUT_TOPBOTTOM) {
                        layout_resize_layout(w, cells[i], type, y - ly, 0);
                        resizes++;
                } else if (x != lx && type == LAYOUT_LEFTRIGHT) {
                        layout_resize_layout(w, cells[i], type, x - lx, 0);
                        resizes++;
                }
        }
        if (resizes != 0)
                server_redraw_window(w);
}