/* $OpenBSD: cmd-resize-pane.c,v 1.68 2026/08/31 07:44:39 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);

  lc = wp->layout_cell; /* may have been replaced by unzoom */

  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);

}