/* $OpenBSD: cmd-join-pane.c,v 1.72 2026/07/15 13:02:33 nicm Exp $ */

/*

 * Copyright (c) 2011 George Nachman <tmux@georgester.com>

 * 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 <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "tmux.h"

/*

 * Join or move a pane into another (like split/swap/kill).

 */

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

static enum cmd_retval  cmd_join_pane_mouse_update(struct cmdq_item *);

static void   cmd_join_pane_mouse_move(struct client *,

          struct mouse_event *);

const struct cmd_entry cmd_join_pane_entry = {

  .name = "join-pane",

  .alias = "joinp",

  .args = { "bdfhvp:l:s:t:", 0, 0, NULL },

  .usage = "[-bdfhv] [-l size] " CMD_SRCDST_PANE_USAGE,

  .source = { 's', CMD_FIND_PANE, CMD_FIND_DEFAULT_MARKED },

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

  .flags = 0,

  .exec = cmd_join_pane_exec

};

const struct cmd_entry cmd_move_pane_entry = {

  .name = "move-pane",

  .alias = "movep",

  .args = { "bdD::fhMvl:L::P:R::s:t:U::X:Y:z:", 0, 0, NULL },

  .usage = "[-bdfhMv] [-D lines] [-l size] [-L columns] [-P position] "

           "[-R columns] " CMD_SRCDST_PANE_USAGE " [-U lines] "

           "[-X x-position] [-Y y-position] [-z z-index]",

  .source = { 's', CMD_FIND_PANE, CMD_FIND_DEFAULT_MARKED },

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

  .flags = 0,

  .exec = cmd_join_pane_exec

};

static enum cmd_retval

cmd_join_pane_place(struct cmdq_item *item, struct winlink *wl,

    struct window_pane *wp, const char *position)

{

  struct window   *w = wl->window;

  struct layout_cell  *lc = wp->layout_cell;

  struct window_pane  *owp;

  int      wx = w->sx, wy = w->sy;

  int      px = lc->g.sx, py = lc->g.sy;

  int      xoff = lc->g.xoff, yoff = lc->g.yoff;

  int      border = 1;

  if (window_pane_get_pane_lines(wp) == PANE_LINES_NONE)

    border = 0;

  if (strcmp(position, "top-left") == 0) {

    xoff = border;

    yoff = border;

  } else if (strcmp(position, "top-centre") == 0 ||

      strcmp(position, "top-center") == 0) {

    xoff = (wx - px) / 2;

    yoff = border;

  } else if (strcmp(position, "top-right") == 0) {

    xoff = wx - px - border;

    yoff = border;

  } else if (strcmp(position, "centre-left") == 0 ||

      strcmp(position, "center-left") == 0) {

    xoff = border;

    yoff = (wy - py) / 2;

  } else if (strcmp(position, "centre") == 0 ||

      strcmp(position, "center") == 0) {

    xoff = (wx - px) / 2;

    yoff = (wy - py) / 2;

  } else if (strcmp(position, "centre-right") == 0 ||

      strcmp(position, "center-right") == 0) {

    xoff = wx - px - border;

    yoff = (wy - py) / 2;

  } else if (strcmp(position, "bottom-left") == 0) {

    xoff = border;

    yoff = wy - py - border;

  } else if (strcmp(position, "bottom-centre") == 0 ||

      strcmp(position, "bottom-center") == 0) {

    xoff = (wx - px) / 2;

    yoff = wy - py - border;

  } else if (strcmp(position, "bottom-right") == 0) {

    xoff = wx - px - border;

    yoff = wy - py - border;

  } else if (strcmp(position, "top-left-centre") == 0 ||

      strcmp(position, "top-left-center") == 0) {

    xoff = wx / 4 - px / 2;

    yoff = wy / 4 - py / 2;

  } else if (strcmp(position, "top-right-centre") == 0 ||

      strcmp(position, "top-right-center") == 0) {

    xoff = (3 * wx) / 4 - px / 2;

    yoff = wy / 4 - py / 2;

  } else if (strcmp(position, "bottom-left-centre") == 0 ||

      strcmp(position, "bottom-left-center") == 0) {

    xoff = wx / 4 - px / 2;

    yoff = (3 * wy) / 4 - py / 2;

  } else if (strcmp(position, "bottom-right-centre") == 0 ||

      strcmp(position, "bottom-right-center") == 0) {

    xoff = (3 * wx) / 4 - px / 2;

    yoff = (3 * wy) / 4 - py / 2;

  } else if (strcmp(position, "front") == 0) {

    TAILQ_REMOVE(&w->z_index, wp, zentry);

    TAILQ_INSERT_HEAD(&w->z_index, wp, zentry);

  } else if (strcmp(position, "back") == 0) {

    TAILQ_REMOVE(&w->z_index, wp, zentry);

    TAILQ_FOREACH(owp, &w->z_index, zentry) {

      if (!window_pane_is_floating(owp))

        break;

    }

    if (owp != NULL)

      TAILQ_INSERT_BEFORE(owp, wp, zentry);

    else

      TAILQ_INSERT_TAIL(&w->z_index, wp, zentry);

  } else if (strcmp(position, "forward") == 0) {

    owp = TAILQ_PREV(wp, window_panes_zindex, zentry);

    if (owp != NULL) {

      TAILQ_REMOVE(&w->z_index, wp, zentry);

      TAILQ_INSERT_BEFORE(owp, wp, zentry);

    }

  } else if (strcmp(position, "backward") == 0) {

    owp = TAILQ_NEXT(wp, zentry);

    if (owp != NULL && window_pane_is_floating(owp)) {

      TAILQ_REMOVE(&w->z_index, wp, zentry);

      TAILQ_INSERT_AFTER(&w->z_index, owp, wp, zentry);

    }

  } else if (strcmp(position, "forward-loop") == 0) {

    owp = TAILQ_PREV(wp, window_panes_zindex, zentry);

    TAILQ_REMOVE(&w->z_index, wp, zentry);

    if (owp != NULL)

      TAILQ_INSERT_BEFORE(owp, wp, zentry);

    else {

      TAILQ_FOREACH(owp, &w->z_index, zentry) {

        if (!window_pane_is_floating(owp))

          break;

      }

      if (owp != NULL)

        TAILQ_INSERT_BEFORE(owp, wp, zentry);

      else

        TAILQ_INSERT_TAIL(&w->z_index, wp, zentry);

    }

  } else if (strcmp(position, "backward-loop") == 0) {

    owp = TAILQ_NEXT(wp, zentry);

    if (owp != NULL && window_pane_is_floating(owp)) {

      TAILQ_REMOVE(&w->z_index, wp, zentry);

      TAILQ_INSERT_AFTER(&w->z_index, owp, wp, zentry);

    } else {

      TAILQ_REMOVE(&w->z_index, wp, zentry);

      TAILQ_INSERT_HEAD(&w->z_index, wp, zentry);

    }

  } else {

    cmdq_error(item, "unknown position: %s", position);

    return (CMD_RETURN_ERROR);

  }

  if (xoff != lc->g.xoff || yoff != lc->g.yoff) {

    lc->g.xoff = xoff;

    lc->g.yoff = yoff;

    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_join_pane_move(struct cmdq_item *item, struct args *args,

    struct winlink *wl, struct window_pane *wp)

{

  struct window   *w = wl->window;

  struct layout_cell  *lc = wp->layout_cell;

  const char    *errstr, *argval;

  const char     flags[] = { 'U', 'D', 'L', 'R' };

  char      *cause = NULL, flag;

  int      xoff = lc->g.xoff, yoff = lc->g.yoff, adjust;

  u_int      i;

  enum pane_lines    lines = window_pane_get_pane_lines(wp);

  if (args_has(args, 'X')) {

    xoff = args_percentage_and_expand(args, 'X', -(int)w->sx,

        w->sx, w->sx, item, &cause);

    if (cause != NULL) {

      cmdq_error(item, "position %s", cause);

      free(cause);

      return (CMD_RETURN_ERROR);

    }

    if (lines != PANE_LINES_NONE)

      xoff += 1;

  }

  if (args_has(args, 'Y')) {

    yoff = args_percentage_and_expand(args, 'Y', -(int)w->sy,

        w->sy, w->sy, item, &cause);

    if (cause != NULL) {

      cmdq_error(item, "position %s", cause);

      free(cause);

      return (CMD_RETURN_ERROR);

    }

    if (lines != PANE_LINES_NONE)

      yoff += 1;

  }

  for (i = 0; i < nitems(flags); i++) {

    flag = flags[i];

    if (!args_has(args, flag))

      continue;

    argval = args_get(args, flag);

    if (argval == NULL)

      argval = "1";

    adjust = strtonum(argval, INT_MIN, INT_MAX, &errstr);

    if (errstr != NULL) {

      cmdq_error(item, "offset %s", errstr);

      return (CMD_RETURN_ERROR);

    }

    if (flag == 'U')

      yoff -= adjust;

    else if (flag == 'D')

      yoff += adjust;

    else if (flag == 'L')

      xoff -= adjust;

    else

      xoff += adjust;

  }

  if (xoff != lc->g.xoff || yoff != lc->g.yoff) {

    lc->g.xoff = xoff;

    lc->g.yoff = yoff;

    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_join_pane_mouse_update(struct cmdq_item *item)

{

  struct cmd_find_state *target = cmdq_get_target(item);

  struct key_event  *event = cmdq_get_event(item);

  struct client   *c = cmdq_get_client(item);

  struct session    *s = target->s;

  struct winlink    *wl;

  struct window   *w;

  struct window_pane  *wp;

  if (!event->m.valid)

    return (CMD_RETURN_NORMAL);

  wp = cmd_mouse_pane(&event->m, &s, &wl);

  if (wp == NULL || c == NULL || c->session != s)

    return (CMD_RETURN_NORMAL);

  if (!window_pane_is_floating(wp))

    return (CMD_RETURN_NORMAL);

  w = wl->window;

  window_redraw_active_switch(w, wp);

  window_set_active_pane(w, wp, 1);

  c->tty.mouse_drag_update = cmd_join_pane_mouse_move;

  cmd_join_pane_mouse_move(c, &event->m);

  return (CMD_RETURN_NORMAL);

}

static void

cmd_join_pane_mouse_move(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;

  wp = cmd_mouse_pane(m, NULL, &wl);

  if (wp == NULL) {

    c->tty.mouse_drag_update = NULL;

    return;

  }

  w = wl->window;

  lc = wp->layout_cell;

  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 (x != lx || y != ly) {

    lc->g.xoff += x - lx;

    lc->g.yoff += y - ly;

    layout_fix_panes(w, NULL);

    server_redraw_window(w);

    server_redraw_window_borders(w);

  }

}

static enum cmd_retval

cmd_join_pane_zindex(struct cmdq_item *item, struct winlink *wl,

    struct window_pane *wp, const char *s)

{

  struct window   *w = wl->window;

  struct window_pane  *owp;

  const char    *errstr;

  u_int      n, z;

  z = strtonum(s, 0, UINT_MAX, &errstr);

  if (errstr != NULL) {

    cmdq_error(item, "z-index %s", errstr);

    return (CMD_RETURN_ERROR);

  }

  TAILQ_REMOVE(&w->z_index, wp, zentry);

  n = 0;

  TAILQ_FOREACH(owp, &w->z_index, zentry) {

    if (!window_pane_is_floating(owp))

      break;

    if (n >= z)

      break;

    n++;

  }

  if (owp != NULL)

    TAILQ_INSERT_BEFORE(owp, wp, zentry);

  else

    TAILQ_INSERT_TAIL(&w->z_index, wp, zentry);

  events_fire_window("window-layout-changed", w);

  server_redraw_window(w);

  return (CMD_RETURN_NORMAL);

}

static enum cmd_retval

cmd_join_pane_tile(struct cmdq_item *item, struct args *args, struct window *w,

    struct window_pane *wp)

{

  struct layout_cell  *lc = wp->layout_cell;

  if (!window_pane_is_floating(wp)) {

    cmdq_error(item, "pane is not floating");

    return (CMD_RETURN_ERROR);

  }

  if (w->flags & WINDOW_ZOOMED) {

    cmdq_error(item, "can't tile a pane while window is zoomed");

    return (CMD_RETURN_ERROR);

  }

  lc->fg.sx = lc->g.sx;

  lc->fg.sy = lc->g.sy;

  lc->fg.xoff = lc->g.xoff;

  lc->fg.yoff = lc->g.yoff;

  if (layout_insert_tile(w, lc) != 0) {

    cmdq_error(item, "no space for a new pane");

    return (CMD_RETURN_ERROR);

  }

  lc->flags &= ~LAYOUT_CELL_FLOATING;

  TAILQ_REMOVE(&w->z_index, wp, zentry);

  TAILQ_INSERT_TAIL(&w->z_index, wp, zentry);

  if (!args_has(args, 'd'))

    window_set_active_pane(w, wp, 1);

  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_join_pane_exec(struct cmd *self, struct cmdq_item *item)

{

  struct args   *args = cmd_get_args(self);

  struct cmd_find_state *current = cmdq_get_current(item);

  struct cmd_find_state *target = cmdq_get_target(item);

  struct cmd_find_state *source = cmdq_get_source(item);

  struct session    *dst_s;

  struct winlink    *src_wl, *dst_wl;

  struct window   *src_w, *dst_w;

  struct window_pane  *src_wp, *dst_wp;

  const char    *s;

  char      *cause = NULL;

  int      flags = 0, dst_idx;

  struct layout_cell  *lc;

  dst_s = target->s;

  dst_wl = target->wl;

  dst_wp = target->wp;

  dst_w = dst_wl->window;

  dst_idx = dst_wl->idx;

  if (cmd_get_entry(self) == &cmd_move_pane_entry) {

    if (args_has(args, 'M'))

      return (cmd_join_pane_mouse_update(item));

    if (!window_pane_is_floating(dst_wp)) {

      cmdq_error(item, "pane is not floating");

      return (CMD_RETURN_ERROR);

    }

    if ((s = args_get(args, 'P')) != NULL) {

      server_unzoom_window(dst_w);

      return (cmd_join_pane_place(item, dst_wl, dst_wp, s));

    }

    if ((s = args_get(args, 'z')) != NULL) {

      server_unzoom_window(dst_w);

      return (cmd_join_pane_zindex(item, dst_wl, dst_wp, s));

    }

    if (args_has(args, 'X') ||

        args_has(args, 'Y') ||

        args_has(args, 'U') ||

        args_has(args, 'D') ||

        args_has(args, 'L') ||

        args_has(args, 'R')) {

      server_unzoom_window(dst_w);

      return (cmd_join_pane_move(item, args, dst_wl, dst_wp));

    }

  }

  src_wl = source->wl;

  src_wp = source->wp;

  src_w = src_wl->window;

  if (src_wp == src_w->modal || dst_wp == dst_w->modal) {

    cmdq_error(item, "pane is modal");

    return (CMD_RETURN_ERROR);

  }

  server_unzoom_window(dst_w);

  server_unzoom_window(src_w);

  if (src_wp == dst_wp) {

    if (window_pane_is_floating(src_wp))

      return (cmd_join_pane_tile(item, args, src_w, src_wp));

    cmdq_error(item, "source and target panes must be different");

    return (CMD_RETURN_ERROR);

  }

  if (args_has(args, 'h'))

    flags |= SPAWN_HORIZONTAL;

  if (args_has(args, 'b'))

    flags |= SPAWN_BEFORE;

  if (args_has(args, 'f'))

    flags |= SPAWN_FULLSIZE;

  lc = layout_get_tiled_cell(item, args, dst_w, dst_wp, flags, &cause);

  if (cause != NULL) {

    cmdq_error(item, "size or position %s", cause);

    free(cause);

    return (CMD_RETURN_ERROR);

  }

  layout_close_pane(src_wp);

  server_client_remove_pane(src_wp);

  window_lost_pane(src_w, src_wp);

  TAILQ_REMOVE(&src_w->panes, src_wp, entry);

  TAILQ_REMOVE(&src_w->z_index, src_wp, zentry);

  src_wp->window = dst_w;

  options_set_parent(src_wp->options, dst_w->options);

  src_wp->flags |= (PANE_STYLECHANGED|PANE_THEMECHANGED);

  if (flags & SPAWN_BEFORE) {

    TAILQ_INSERT_BEFORE(dst_wp, src_wp, entry);

    TAILQ_INSERT_BEFORE(dst_wp, src_wp, zentry);

  } else {

    TAILQ_INSERT_AFTER(&dst_w->panes, dst_wp, src_wp, entry);

    TAILQ_INSERT_AFTER(&dst_w->z_index, dst_wp, src_wp, zentry);

  }

  layout_assign_pane(lc, src_wp, 0);

  colour_palette_from_option(&src_wp->palette, src_wp->options);

  recalculate_sizes();

  server_redraw_window(src_w);

  server_redraw_window(dst_w);

  if (!args_has(args, 'd')) {

    window_set_active_pane(dst_w, src_wp, 1);

    session_select(dst_s, dst_idx);

    cmd_find_from_session(current, dst_s, 0);

    server_redraw_session(dst_s);

  } else

    server_status_session(dst_s);

  window_fire_pane_moved(src_wp, src_w, src_wl->idx, dst_w, dst_idx);

  if (window_count_panes(src_w, 1) == 0)

    server_kill_window(src_w, 1);

  else

    events_fire_window("window-layout-changed", src_w);

  events_fire_window("window-layout-changed", dst_w);

  return (CMD_RETURN_NORMAL);

}