/src/tmux/window.c

Source
/* $OpenBSD: window.c,v 1.388 2026/10/16 14:26:08 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 "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)
{
  if (w1->id < w2->id)
    return (-1);
  if (w1->id > w2->id)
    return (1);
  return (0);
}

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)
{
  if (wp1->id < wp2->id)
    return (-1);
  if (wp1->id > wp2->id)
    return (1);
  return (0);
}

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);
  TAILQ_INIT(&w->damage);
  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);
  redraw_invalidate_scene(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)
{
  struct window_pane  *wp;

  log_debug("window @%u destroyed (%d references)", w->id, w->references);

  if (w->flags & WINDOW_ZOOMED) {
    w->flags &= ~WINDOW_ZOOMED;
    TAILQ_FOREACH(wp, &w->panes, entry) {
      wp->flags &= ~PANE_ZOOMED;
      wp->saved_layout_cell = NULL;
    }
  }
  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);
  redraw_free_damage(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)
#ifdef __sun
    /*
     * Some versions of Solaris apparently can return an error when
     * resizing; don't know why this happens, can't reproduce on
     * other platforms and ignoring it doesn't seem to cause any
     * issues.
     */
    if (errno != EINVAL && errno != ENXIO)
#endif
    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);
}

/*
 * Does floating pane, including its borders and scrollbar, overlap any cell of
 * another pane, including its scrollbar?
 */
int
window_pane_floating_overlaps(struct window_pane *fwp, struct window_pane *wp)
{
  int fxoff, fyoff, xoff, yoff, border = 0;
  u_int fsx, fsy, sx, sy;

  if (!window_pane_is_floating(fwp))
    return (0);

  window_pane_full_size_offset(fwp, &fxoff, &fyoff, &fsx, &fsy);
  window_pane_full_size_offset(wp, &xoff, &yoff, &sx, &sy);

  if (window_pane_get_pane_lines(fwp) != PANE_LINES_NONE)
    border = 1;

  if (fxoff - border >= xoff + (int)sx ||
      fxoff + (int)fsx + border <= xoff)
    return (0);
  if (fyoff - border >= yoff + (int)sy ||
      fyoff + (int)fsy + border <= yoff)
    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 &&
            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;
  int       unzoomed;

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

  if (wp == w->active)
    return (0);
  if (w->modal != NULL && wp != w->modal)
    return (0);
  unzoomed = (w->flags & WINDOW_ZOOMED) && !window_pane_is_visible(wp);
  if (unzoomed)
    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);

  /*
   * Unzooming changes every pane's geometry and needs a full window
   * redraw. Otherwise, only the previous and new active pane's border
   * and status appearance changed, so avoid redrawing unaffected pane
   * content.
   */
  if (unzoomed)
    server_redraw_window(w);
  else {
    server_redraw_window_borders(w);
    server_status_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);
  }

  /*
   * A floating pane is above every tiled pane, including their status
   * lines, so check those first.
   */
  TAILQ_FOREACH(wp, &w->z_index, zentry) {
    if (window_pane_is_floating(wp) &&
        window_pane_contains(wp, x, y))
      return (wp);
  }

  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;
  struct layout_cell  *lc;
  struct layout_geometry   lg;

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

  if (w->active != wp &&
      (w->active == NULL ||
      (~w->active->flags & PANE_FLOATOVERZOOM) ||
      !window_pane_is_floating(w->active)))
    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);
  TAILQ_FOREACH(wp1, &w->panes, entry) {
    lc = wp1->saved_layout_cell;
    if (wp1 == wp ||
        (~wp1->flags & PANE_FLOATOVERZOOM) ||
        lc == NULL ||
        (~lc->flags & LAYOUT_CELL_FLOATING))
      continue;
    memcpy(&lg, &lc->g, sizeof lg);
    lc = layout_floating_pane(w, wp, &lg);
    layout_assign_pane(lc, wp1, 0);
  }
  /* A floating zoom target is now tiled, so put it behind the floats. */
  if (wp->saved_layout_cell->flags & LAYOUT_CELL_FLOATING) {
    TAILQ_REMOVE(&w->z_index, wp, zentry);
    TAILQ_INSERT_TAIL(&w->z_index, wp, zentry);
  }
  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, *zoomed = NULL;
  struct layout_cell  *slc;

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

  TAILQ_FOREACH(wp, &w->panes, entry) {
    if (wp->flags & PANE_ZOOMED)
      zoomed = wp;
    if (~wp->flags & PANE_FLOATOVERZOOM)
      continue;
    if (wp->flags & PANE_ZOOMED)
      continue;
    slc = wp->saved_layout_cell;
    if (slc == NULL || wp->layout_cell == NULL)
      continue;
    memcpy(&slc->g, &wp->layout_cell->g, sizeof slc->g);
    memcpy(&slc->fg, &wp->layout_cell->fg, sizeof slc->fg);
  }

  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;
  }
  /* Put a floating zoom target back into the floating part of the list. */
  if (zoomed != NULL && window_pane_is_floating(zoomed)) {
    TAILQ_REMOVE(&w->z_index, zoomed, zentry);
    if (zoomed == w->active)
      TAILQ_INSERT_HEAD(&w->z_index, zoomed, zentry);
    else {
      TAILQ_FOREACH(wp, &w->z_index, zentry) {
        if (!window_pane_is_floating(wp))
          break;
      }
      if (wp == NULL)
        TAILQ_INSERT_TAIL(&w->z_index, zoomed, zentry);
      else
        TAILQ_INSERT_BEFORE(wp, zoomed, zentry);
    }
  }
  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);
}

struct window_pane *
window_zoomed_pane(struct window *w)
{
  struct window_pane  *wp;

  if (~w->flags & WINDOW_ZOOMED)
    return (NULL);
  TAILQ_FOREACH_REVERSE(wp, &w->z_index, window_panes_zindex, zentry) {
    if (wp->layout_cell != NULL && !window_pane_is_floating(wp))
      return (wp);
  }
  return (NULL);
}

int
window_active_pane_is_over_zoom(struct window *w)
{
  if (~w->flags & WINDOW_ZOOMED)
    return (0);
  if (w->active == NULL)
    return (0);
  if (~w->active->flags & PANE_FLOATOVERZOOM)
    return (0);
  return (window_pane_is_floating(w->active));
}

int
window_push_zoom(struct window *w, int always, int flag)
{
  struct window_pane  *wp = window_zoomed_pane(w);

  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;
  if (w->flags & WINDOW_WASZOOMED)
    w->was_zoomed = wp;
  else
    w->was_zoomed = NULL;
  return (window_unzoom(w, 1) == 0);
}

int
window_pop_zoom(struct window *w)
{
  struct window_pane  *wp = w->was_zoomed;

  log_debug("%s: @%u %d", __func__, w->id,
      !!(w->flags & WINDOW_WASZOOMED));
  if (w->flags & WINDOW_WASZOOMED) {
    w->flags &= ~WINDOW_WASZOOMED;
    w->was_zoomed = NULL;
    if (w->active != NULL &&
        ((~w->active->flags & PANE_FLOATOVERZOOM) ||
        !window_pane_is_floating(w->active)))
      wp = w->active;
    if (wp == NULL || !window_has_pane(w, wp))
      wp = w->active;
    if (wp != NULL)
      return (window_zoom(wp) == 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);
}

static void
window_forget_pane(struct window *w, struct window_pane *wp)
{
  if (wp == marked_pane.wp)
    server_clear_marked();
  if (wp == w->modal_last)
    w->modal_last = NULL;
  if (wp == w->was_zoomed)
    w->was_zoomed = NULL;
  window_pane_stack_remove(&w->last_panes, wp);
  redraw_invalidate_scene(w);
}

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);

  window_forget_pane(w, 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;
}

void
window_remove_pane(struct window *w, struct window_pane *wp)
{
  window_lost_pane(w, wp);
  TAILQ_REMOVE(&w->panes, wp, entry);
  TAILQ_REMOVE(&w->z_index, wp, zentry);
  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);
}

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

  *i = 0;
  TAILQ_FOREACH(wq, &w->last_panes, sentry) {
    if (wq == wp)
      return (0);
    (*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);
    window_forget_pane(w, wp);
    if (wp == w->active)
      w->active = NULL;
    if (wp == w->modal)
      w->modal = NULL;
    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->flags & PANE_FLOATOVERZOOM)
    flags[pos++] = 'A';
  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 = 128 + SIGHUP;

  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_visible(wp))
    return;
  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);
}

#ifdef HAVE_UTEMPTER
void
window_pane_utmp_add(struct window_pane *wp)
{
  char  *cp;

  if (wp->fd == -1 ||
      (wp->flags & (PANE_EMPTY|PANE_EXITED|PANE_UTMP)) ||
      !options_get_number(global_options, "utmp"))
    return;
  xasprintf(&cp, "tmux(%lu).%%%u", (long)getpid(), wp->id);
  utempter_add_record(wp->fd, cp);
  kill(getpid(), SIGCHLD);
  wp->flags |= PANE_UTMP;
  free(cp);
}
#else
void
window_pane_utmp_add(__unused struct window_pane *wp)
{
}
#endif

#ifdef HAVE_UTEMPTER
void
window_pane_utmp_remove(struct window_pane *wp)
{
  if (~wp->flags & PANE_UTMP)
    return;
  utempter_remove_record(wp->fd);
  kill(getpid(), SIGCHLD);
  wp->flags &= ~PANE_UTMP;
}
#else
void
window_pane_utmp_remove(__unused struct window_pane *wp)
{
}
#endif

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_sync_clear_dirty(wp);

  if (wp->event != NULL) {
    bufferevent_free(wp->event);
    wp->event = NULL;
  }
  if (wp->fd != -1) {
    window_pane_utmp_remove(wp);
    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);
  free(wp->cmd_line);
  screen_free(&wp->status_screen);
  screen_free(&wp->base);
  free(wp->r.ranges);
  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->border_status_line.expanded);
  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);

  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);
#ifdef ENABLE_IMAGES
  if (sx > r->osx)
    image_grid_resize_width(wp->base.grid, sx);
#endif

  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->layout_cell != NULL);
}

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 || wl->idx == INT_MAX)
    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_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);
}

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

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

/* Report damage for a floating pane, including its border and scrollbar. */
static void
window_damage_floating_pane(struct window_pane *wp, int xoff, int yoff,
    int sx, int sy)
{
  struct window *w = wp->window;
  int    x0, x1, y0, y1, sb_left = 0, sb_right = 0;
  struct style  *sb_sy = &wp->scrollbar_style;

  if (window_pane_scrollbar_reserve(wp)) {
    if (w->sb_pos == PANE_SCROLLBARS_LEFT)
      sb_left = sb_sy->width + sb_sy->pad;
    else
      sb_right = sb_sy->width + sb_sy->pad;
  }
  x0 = xoff - 1 - sb_left;
  x1 = xoff + sx + sb_right;
  y0 = yoff - 1;
  y1 = yoff + sy;
  if (x0 < 0)
    x0 = 0;
  if (y0 < 0)
    y0 = 0;
  if (x1 >= x0 && y1 >= y0)
    redraw_damage_window(w, x0, y0, x1 - x0 + 1U, y1 - y0 + 1U);
}

/* Report damage for a floating pane's old and new areas. */
void
window_redraw_floating_pane(struct window_pane *wp, int oxoff, int oyoff,
    int osx, int osy)
{
  window_damage_floating_pane(wp, oxoff, oyoff, osx, osy);
  window_damage_floating_pane(wp, wp->xoff, wp->yoff, wp->sx, wp->sy);
  server_status_window(wp->window);
}

Coverage Report

Created: 2026-10-17 06:19