/* $OpenBSD: cmd-split-window.c,v 1.156 2026/10/16 08:11:03 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 <errno.h>

#include <fcntl.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include "tmux.h"

/*

 * Create a new pane.

 */

#define SPLIT_WINDOW_TEMPLATE "#{session_name}:#{window_index}.#{pane_index}"

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

static void   cmd_split_window_mouse_resize(struct client *,

          struct mouse_event *);

const struct cmd_entry cmd_new_pane_entry = {

  .name = "new-pane",

  .description = "Create a floating pane.",

  .alias = "newp",

  .args = { "AbB:Cc:Dde:EfF:hIkl:KLMm:Op:PR:s:S:t:T:vWx:X:y:Y:Z", 0, -1, NULL },

  .usage = "[-AbCDdEfhIkKLMOPvWZ] [-B border-lines] "

     "[-c start-directory] [-e environment] "

     "[-F format] [-l size] [-m message] [-p percentage] "

     "[-s style] [-S active-border-style] "

     "[-R inactive-border-style] [-T title] [-x width] [-y height] "

     "[-X x-position] [-Y y-position] " CMD_TARGET_PANE_USAGE " "

     "[shell-command [argument ...]]",

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

  .flags = 0,

  .exec = cmd_split_window_exec

};

const struct cmd_entry cmd_split_window_entry = {

  .name = "split-window",

  .description = "Create a new pane by splitting a window.",

  .alias = "splitw",

  .args = { "bB:c:de:EfF:hIkl:m:p:PR:s:S:t:T:vWZ", 0, -1, NULL },

  .usage = "[-bdEfhIkPvWZ] [-B border-lines] [-c start-directory] "

     "[-e environment] [-F format] [-l size] [-m message] "

     "[-p percentage] [-s style] [-S active-border-style] "

     "[-R inactive-border-style] [-T title] "

           CMD_TARGET_PANE_USAGE " [shell-command [argument ...]]",

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

  .flags = 0,

  .exec = cmd_split_window_exec

};

static enum cmd_retval

cmd_split_window_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 spawn_context   sc = { 0 };

  struct client   *tc = cmdq_get_target_client(item);

  struct session    *s = target->s;

  struct winlink    *wl = target->wl;

  struct window   *w = wl->window;

  struct window_pane  *wp = target->wp, *new_wp = NULL;

  struct layout_cell  *lc = NULL;

  struct event_payload  *ep;

  struct cmd_find_state  fs;

  struct key_event  *event = cmdq_get_event(item);

  int      input, empty, is_floating, flags = 0;

  int      restore_zoom = 0;

  const char    *template, *style, *value;

  char      *cause = NULL, *cp, *title;

  const struct options_table_entry *oe;

  struct args_value *av;

  enum pane_lines    lines;

  u_int      count = args_count(args);

  if (window_active_pane_is_over_zoom(w))

    restore_zoom = 1;

  if (cmd_get_entry(self) == &cmd_new_pane_entry)

    is_floating = !args_has(args, 'L');

  else {

    if (!window_pane_is_visible(wp))

      restore_zoom = 0;

    if (!restore_zoom)

      window_unzoom(w, 1);

    is_floating = window_pane_is_floating(wp);

    flags |= SPAWN_SPLIT;

  }

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

    if (!is_floating) {

      cmdq_error(item, "modal pane must be floating");

      return (CMD_RETURN_ERROR);

    }

    if (w->modal != NULL) {

      cmdq_error(item, "window already has a modal pane");

      return (CMD_RETURN_ERROR);

    }

  }

  if (args_has(args, 'M') && is_floating) {

    if (event == NULL || !event->m.valid || tc == NULL)

      return (CMD_RETURN_NORMAL);

  }

  if (is_floating)

    flags |= SPAWN_FLOATING;

  if (args_has(args, 'h'))

    flags |= SPAWN_HORIZONTAL;

  if (args_has(args, 'b'))

    flags |= SPAWN_BEFORE;

  if (args_has(args, 'f'))

    flags |= SPAWN_FULLSIZE;

  if (args_has(args, 'd'))

    flags |= SPAWN_DETACHED;

  if (args_has(args, 'Z'))

    flags |= SPAWN_ZOOM;

  if (args_has(args, 'O'))

    flags |= SPAWN_MODAL|SPAWN_FLOATOVERZOOM;

  if (is_floating && args_has(args, 'A'))

    flags |= SPAWN_FLOATOVERZOOM;

  if ((w->flags & WINDOW_ZOOMED) && (flags & SPAWN_FLOATOVERZOOM))

    restore_zoom = 1;

  input = args_has(args, 'I');

  if (input || (count == 1 && *args_string(args, 0) == '\0'))

    empty = 1;

  else

    empty = args_has(args, 'E');

  if (empty &&

      count != 0 &&

      (count != 1 || *args_string(args, 0) != '\0')) {

    cmdq_error(item, "command cannot be given for empty pane");

    return (CMD_RETURN_ERROR);

  }

  if (empty)

    flags |= SPAWN_EMPTY;

  if ((value = args_get(args, 'B')) == NULL)

    lines = window_get_pane_lines(w);

  else {

    oe = options_search("pane-border-lines");

    lines = options_find_choice(oe, value, &cause);

    if (cause != NULL) {

      cmdq_error(item, "pane-border-lines %s", cause);

      free(cause);

      return (CMD_RETURN_ERROR);

    }

  }

  if (flags & SPAWN_FLOATING) {

    lc = layout_get_floating_cell(item, args, lines, w, wp, flags,

        &cause);

  } else

    lc = layout_get_tiled_cell(item, args, w, wp, flags, &cause);

  if (cause != NULL) {

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

    free(cause);

    if (restore_zoom)

      window_pop_zoom(w);

    return (CMD_RETURN_ERROR);

  }

  sc.item = item;

  sc.s = s;

  sc.wl = wl;

  sc.wp0 = wp;

  sc.lc = lc;

  args_to_vector(args, &sc.argc, &sc.argv);

  sc.environ = environ_create();

  av = args_first_value(args, 'e');

  while (av != NULL) {

    environ_put(sc.environ, av->string, 0);

    av = args_next_value(av);

  }

  sc.idx = -1;

  sc.cwd = args_get(args, 'c');

  sc.flags = flags;

  if ((new_wp = spawn_pane(&sc, &cause)) == NULL) {

    cmdq_error(item, "create pane failed: %s", cause);

    free(cause);

    /*

     * spawn_pane has already torn the half-built pane down (its

     * fork-failure path removes the pane and destroys the layout

     * cell), so new_wp is NULL and there is nothing for fail to do.

     */

    goto fail;

  }

  if (args_has(args, 'K') && args_has(args, 'O'))

    new_wp->flags |= PANE_CAPTUREALLKEYS;

  if (args_has(args, 'C') && args_has(args, 'O'))

    new_wp->flags |= PANE_CLOSEONCLICK;

  if (args_has(args, 'D') && args_has(args, 'O'))

    new_wp->flags |= PANE_CLOSEONCANCEL;

  style = args_get(args, 's');

  if (style != NULL) {

    if (options_set_string(new_wp->options, "window-style", 0,

        "%s", style) == NULL) {

      cmdq_error(item, "bad style: %s", style);

      goto fail;

    }

    options_set_string(new_wp->options, "window-active-style", 0,

        "%s", style);

    new_wp->flags |= (PANE_REDRAW|PANE_STYLECHANGED|

        PANE_THEMECHANGED);

  }

  style = args_get(args, 'S');

  if (style != NULL) {

    if (options_set_string(new_wp->options,

        "pane-active-border-style", 0, "%s", style) == NULL) {

      cmdq_error(item, "bad active border style: %s", style);

      goto fail;

    }

  }

  style = args_get(args, 'R');

  if (style != NULL) {

    if (options_set_string(new_wp->options, "pane-border-style", 0,

        "%s", style) == NULL) {

      cmdq_error(item, "bad inactive border style: %s",

          style);

      goto fail;

    }

  }

  if (args_has(args, 'B'))

    options_set_number(new_wp->options, "pane-border-lines", lines);

  if (args_has(args, 'k') || args_has(args, 'm')) {

    options_set_number(new_wp->options, "remain-on-exit", 3);

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

      options_set_string(new_wp->options,

          "remain-on-exit-format", 0, "%s",

          args_get(args, 'm'));

    }

  }

  if (args_has(args, 'T')) {

    title = format_single_from_target(item, args_get(args, 'T'));

    screen_set_title(&new_wp->base, title, 0);

    ep = event_payload_create();

    cmd_find_from_pane(&fs, new_wp, 0);

    event_payload_set_target(ep, &fs);

    event_payload_set_pane(ep, "pane", new_wp);

    event_payload_set_window(ep, "window", new_wp->window);

    event_payload_set_string(ep, "new_title", "%s", title);

    events_fire("pane-title-changed", ep);

    free(title);

  }

  if (input) {

    switch (window_pane_start_input(new_wp, item, &cause)) {

    case -1:

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

      free(cause);

      goto fail;

    case 1:

      input = 0;

      break;

    }

  }

  if (~flags & SPAWN_DETACHED)

    cmd_find_from_winlink_pane(current, wl, new_wp, 0);

  window_pop_zoom(w);

  server_redraw_window(w);

  server_redraw_session(s);

  if (args_has(args, 'M') && is_floating) {

    tc->tty.mouse_last_pane = new_wp->id;

    tc->tty.mouse_drag_update = cmd_split_window_mouse_resize;

    cmd_split_window_mouse_resize(tc, &event->m);

  }

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

    if ((template = args_get(args, 'F')) == NULL)

      template = SPLIT_WINDOW_TEMPLATE;

    cp = format_single(item, template, tc, s, wl, new_wp);

    cmdq_print(item, "%s", cp);

    free(cp);

  }

  cmd_find_from_winlink_pane(&fs, wl, new_wp, 0);

  cmdq_insert_hook(s, item, &fs, "after-split-window");

  if (sc.argv != NULL)

    cmd_free_argv(sc.argc, sc.argv);

  environ_free(sc.environ);

  if (input)

    return (CMD_RETURN_WAIT);

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

    /*

     * With -W, block this command queue item until the pane's

     * command exits; window_pane_wait_finish will be called to

     * continue it.

     */

    new_wp->wait_item = item;

    return (CMD_RETURN_WAIT);

  }

  return (CMD_RETURN_NORMAL);

fail:

  /*

   * If the pane was spawned before we failed, tear it down here; this

   * also destroys its layout cell. spawn_pane's own failure path has

   * already done this, so new_wp is NULL in that case.

   */

  if (new_wp != NULL) {

    server_client_remove_pane(new_wp);

    if (!is_floating)

      layout_close_pane(new_wp);

    window_remove_pane(wp->window, new_wp);

  }

  window_pop_zoom(w);

  if (sc.argv != NULL)

    cmd_free_argv(sc.argc, sc.argv);

  environ_free(sc.environ);

  return (CMD_RETURN_ERROR);

}

static void

cmd_split_window_mouse_resize(struct client *c, struct mouse_event *m)

{

  struct window_pane  *wp;

  struct window   *w;

  struct layout_cell  *lc;

  enum pane_lines    lines;

  u_int      sx, sy;

  int      x, y, xoff, yoff, border;

  int      oxoff, oyoff, osx, osy;

  if (c->tty.mouse_last_pane == -1)

    return;

  wp = window_pane_find_by_id(c->tty.mouse_last_pane);

  if (wp == NULL || !window_pane_is_floating(wp)) {

    c->tty.mouse_drag_update = NULL;

    return;

  }

  w = wp->window;

  lc = wp->layout_cell;

  x = m->x + m->ox;

  y = m->y + m->oy;

  if (m->statusat == 0 && y >= (int)m->statuslines)

    y -= m->statuslines;

  else if (m->statusat > 0 && y >= m->statusat)

    y = m->statusat - 1;

  if (m->sideat == 0 && x >= (int)m->sidewidth)

    x -= m->sidewidth;

  else if (m->sideat > 0 && x >= m->sideat)

    x = m->sideat - 1;

  lines = window_pane_get_pane_lines(wp);

  border = (lines != PANE_LINES_NONE);

  if (x >= (int)c->tty.mouse_drag_x) {

    xoff = c->tty.mouse_drag_x + border;

    sx = x - c->tty.mouse_drag_x + 1;

  } else {

    sx = c->tty.mouse_drag_x - x + 1;

    xoff = c->tty.mouse_drag_x - sx + 1;

    if (border)

      xoff++;

  }

  if (y >= (int)c->tty.mouse_drag_y) {

    yoff = c->tty.mouse_drag_y + border;

    sy = y - c->tty.mouse_drag_y + 1;

  } else {

    sy = c->tty.mouse_drag_y - y + 1;

    yoff = c->tty.mouse_drag_y - sy + 1;

    if (border)

      yoff++;

  }

  if (border) {

    if (sx <= 2)

      sx = PANE_MINIMUM;

    else

      sx -= 2;

    if (sy <= 2)

      sy = PANE_MINIMUM;

    else

      sy -= 2;

  }

  if (sx < PANE_MINIMUM)

    sx = PANE_MINIMUM;

  if (sy < PANE_MINIMUM)

    sy = PANE_MINIMUM;

  oxoff = wp->xoff;

  oyoff = wp->yoff;

  osx = wp->sx;

  osy = wp->sy;

  layout_set_size(lc, sx, sy, xoff, yoff);

  layout_fix_panes(w, NULL);

  window_redraw_floating_pane(wp, oxoff, oyoff, osx, osy);

  server_redraw_window_borders(w);

}