Adding upstream version 3.3a.upstream/3.3a

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1620 insertions, 0 deletions

diff --git a/window.c b/window.c
new file mode 100644
index 0000000..c0cd9bd
--- /dev/null
+++ b/window.c
@@ -0,0 +1,1620 @@
+/* $OpenBSD$ */
+
+/*
+ * 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 <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;
+};
+
+static struct window_pane *window_pane_create(struct window *, u_int, u_int,
+		    u_int);
+static void	window_pane_destroy(struct window_pane *);
+
+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);
+
+int
+window_cmp(struct window *w1, struct window *w2)
+{
+	return (w1->id - w2->id);
+}
+
+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)
+{
+	return (wp1->id - wp2->id);
+}
+
+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);
+}
+
+void
+winlink_stack_remove(struct winlink_stack *stack, struct winlink *wl)
+{
+	struct winlink	*wl2;
+
+	if (wl == NULL)
+		return;
+
+	TAILQ_FOREACH(wl2, stack, sentry) {
+		if (wl2 == wl) {
+			TAILQ_REMOVE(stack, wl, sentry);
+			return;
+		}
+	}
+}
+
+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);
+	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->references = 0;
+	TAILQ_INIT(&w->winlinks);
+
+	w->id = next_window_id++;
+	RB_INSERT(windows, &windows, w);
+
+	window_set_fill_character(w);
+	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)
+{
+	log_debug("window @%u destroyed (%d references)", w->id, w->references);
+
+	RB_REMOVE(windows, &windows, w);
+
+	if (w->layout_root != NULL)
+		layout_free_cell(w->layout_root);
+	if (w->saved_layout_root != NULL)
+		layout_free_cell(w->saved_layout_root);
+	free(w->old_layout);
+
+	window_destroy_panes(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->fill_character);
+
+	free(w->name);
+	free(w);
+}
+
+int
+window_pane_destroy_ready(struct window_pane *wp)
+{
+	int	n;
+
+	if (wp->pipe_fd != -1) {
+		if (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);
+	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)
+{
+	w->references--;
+	log_debug("%s: @%u %s, now %d", __func__, w->id, from, w->references);
+
+	if (w->references == 0)
+		window_destroy(w);
+}
+
+void
+window_set_name(struct window *w, const char *new_name)
+{
+	free(w->name);
+	utf8_stravis(&w->name, new_name, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
+	notify_window("window-renamed", w);
+}
+
+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 (xpixel != -1)
+		w->xpixel = xpixel;
+	if (ypixel != -1)
+		w->ypixel = ypixel;
+}
+
+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_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);
+}
+
+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) {
+		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) {
+					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);
+			notify_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);
+			notify_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)
+{
+	log_debug("%s: pane %%%u", __func__, wp->id);
+
+	if (wp == w->active)
+		return (0);
+	w->last = w->active;
+
+	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(w->last);
+		window_pane_update_focus(w->active);
+	}
+
+	tty_update_window_offset(w);
+
+	if (notify)
+		notify_window("window-pane-changed", w);
+	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 (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 {
+			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;
+		wp = w->active;
+	}
+}
+
+struct window_pane *
+window_get_active_at(struct window *w, u_int x, u_int y)
+{
+	struct window_pane	*wp;
+
+	TAILQ_FOREACH(wp, &w->panes, entry) {
+		if (!window_pane_visible(wp))
+			continue;
+		if (x < wp->xoff || x > wp->xoff + wp->sx)
+			continue;
+		if (y < wp->yoff || y > wp->yoff + wp->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 = options_get_number(w->options, "pane-border-status");
+	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;
+
+	if (w->flags & WINDOW_ZOOMED)
+		return (-1);
+
+	if (window_count_panes(w) == 1)
+		return (-1);
+
+	if (w->active != wp)
+		window_set_active_pane(w, wp, 1);
+
+	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);
+	w->flags |= WINDOW_ZOOMED;
+	notify_window("window-layout-changed", w);
+
+	return (0);
+}
+
+int
+window_unzoom(struct window *w)
+{
+	struct window_pane	*wp;
+
+	if (!(w->flags & WINDOW_ZOOMED))
+		return (-1);
+
+	w->flags &= ~WINDOW_ZOOMED;
+	layout_free(w);
+	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;
+	}
+	layout_fix_panes(w, NULL);
+	notify_window("window-layout-changed", w);
+
+	return (0);
+}
+
+int
+window_push_zoom(struct window *w, int always, int flag)
+{
+	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;
+	return (window_unzoom(w) == 0);
+}
+
+int
+window_pop_zoom(struct window *w)
+{
+	log_debug("%s: @%u %d", __func__, w->id,
+	    !!(w->flags & WINDOW_WASZOOMED));
+	if (w->flags & WINDOW_WASZOOMED)
+		return (window_zoom(w->active) == 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)
+			TAILQ_INSERT_TAIL(&w->panes, wp, entry);
+		else
+			TAILQ_INSERT_AFTER(&w->panes, other, wp, entry);
+	}
+	return (wp);
+}
+
+void
+window_lost_pane(struct window *w, struct window_pane *wp)
+{
+	log_debug("%s: @%u pane %%%u", __func__, w->id, wp->id);
+
+	if (wp == marked_pane.wp)
+		server_clear_marked();
+
+	if (wp == w->active) {
+		w->active = w->last;
+		w->last = NULL;
+		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) {
+			w->active->flags |= PANE_CHANGED;
+			notify_window("window-pane-changed", w);
+			window_update_focus(w);
+		}
+	} else if (wp == w->last)
+		w->last = NULL;
+}
+
+void
+window_remove_pane(struct window *w, struct window_pane *wp)
+{
+	window_lost_pane(w, wp);
+
+	TAILQ_REMOVE(&w->panes, wp, entry);
+	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_pane	*wq;
+	struct window		*w = wp->window;
+
+	*i = options_get_number(w->options, "pane-base-index");
+	TAILQ_FOREACH(wq, &w->panes, entry) {
+		if (wp == wq) {
+			return (0);
+		}
+		(*i)++;
+	}
+
+	return (-1);
+}
+
+u_int
+window_count_panes(struct window *w)
+{
+	struct window_pane	*wp;
+	u_int			 n;
+
+	n = 0;
+	TAILQ_FOREACH(wp, &w->panes, entry)
+		n++;
+	return (n);
+}
+
+void
+window_destroy_panes(struct window *w)
+{
+	struct window_pane	*wp;
+
+	while (!TAILQ_EMPTY(&w->panes)) {
+		wp = TAILQ_FIRST(&w->panes);
+		TAILQ_REMOVE(&w->panes, wp, entry);
+		window_pane_destroy(wp);
+	}
+}
+
+const char *
+window_printable_flags(struct winlink *wl, int escape)
+{
+	struct session	*s = wl->session;
+	static char	 flags[32];
+	int		 pos;
+
+	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->flags & WINDOW_ZOOMED)
+		flags[pos++] = 'Z';
+	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->window = w;
+	wp->options = options_create(w->options);
+	wp->flags = PANE_STYLECHANGED;
+
+	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;
+
+	colour_palette_init(&wp->palette);
+	colour_palette_from_option(&wp->palette, wp->options);
+
+	screen_init(&wp->base, sx, sy, hlimit);
+	wp->screen = &wp->base;
+
+	screen_init(&wp->status_screen, 1, 1, 0);
+
+	if (gethostname(host, sizeof host) == 0)
+		screen_set_title(&wp->base, host);
+
+	return (wp);
+}
+
+static void
+window_pane_destroy(struct window_pane *wp)
+{
+	struct window_pane_resize	*r;
+	struct window_pane_resize	*r1;
+
+	window_pane_reset_mode_all(wp);
+	free(wp->searchstr);
+
+	if (wp->fd != -1) {
+#ifdef HAVE_UTEMPTER
+		utempter_remove_record(wp->fd);
+#endif
+		bufferevent_free(wp->event);
+		close(wp->fd);
+	}
+	if (wp->ictx != NULL)
+		input_free(wp->ictx);
+
+	screen_free(&wp->status_screen);
+
+	screen_free(&wp->base);
+
+	if (wp->pipe_fd != -1) {
+		bufferevent_free(wp->pipe_event);
+		close(wp->pipe_fd);
+	}
+
+	if (event_initialized(&wp->resize_timer))
+		event_del(&wp->resize_timer);
+	TAILQ_FOREACH_SAFE(r, &wp->resize_queue, entry, r1) {
+		TAILQ_REMOVE(&wp->resize_queue, r, entry);
+		free(r);
+	}
+
+	RB_REMOVE(window_pane_tree, &all_window_panes, wp);
+
+	options_free(wp->options);
+	free((void *)wp->cwd);
+	free(wp->shell);
+	cmd_free_argv(wp->argc, wp->argv);
+	colour_palette_free(&wp->palette);
+	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);
+	wp->ictx = input_init(wp, wp->event, &wp->palette);
+
+	bufferevent_enable(wp->event, EV_READ|EV_WRITE);
+}
+
+void
+window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
+{
+	struct window_mode_entry	*wme;
+	struct window_pane_resize	*r;
+
+	if (sx == wp->sx && sy == wp->sy)
+		return;
+
+	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);
+
+	wme = TAILQ_FIRST(&wp->modes);
+	if (wme != NULL && wme->mode->resize != NULL)
+		wme->mode->resize(wme, sx, sy);
+}
+
+int
+window_pane_set_mode(struct window_pane *wp, struct window_pane *swp,
+    const struct window_mode *mode, struct cmd_find_state *fs,
+    struct args *args)
+{
+	struct window_mode_entry	*wme;
+
+	if (!TAILQ_EMPTY(&wp->modes) && TAILQ_FIRST(&wp->modes)->mode == mode)
+		return (1);
+
+	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, fs, args);
+	}
+
+	wp->screen = wme->screen;
+	wp->flags |= (PANE_REDRAW|PANE_CHANGED);
+
+	server_redraw_window_borders(wp->window);
+	server_status_window(wp->window);
+	notify_pane("pane-mode-changed", wp);
+
+	return (0);
+}
+
+void
+window_pane_reset_mode(struct window_pane *wp)
+{
+	struct window_mode_entry	*wme, *next;
+
+	if (TAILQ_EMPTY(&wp->modes))
+		return;
+
+	wme = TAILQ_FIRST(&wp->modes);
+	TAILQ_REMOVE(&wp->modes, wme, entry);
+	wme->mode->free(wme);
+	free(wme);
+
+	next = TAILQ_FIRST(&wp->modes);
+	if (next == NULL) {
+		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);
+	}
+	wp->flags |= (PANE_REDRAW|PANE_CHANGED);
+
+	server_redraw_window_borders(wp->window);
+	server_status_window(wp->window);
+	notify_pane("pane-mode-changed", wp);
+}
+
+void
+window_pane_reset_mode_all(struct window_pane *wp)
+{
+	while (!TAILQ_EMPTY(&wp->modes))
+		window_pane_reset_mode(wp);
+}
+
+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_visible(loop) &&
+		    options_get_number(loop->options, "synchronize-panes"))
+			input_key_pane(loop, key, NULL);
+	}
+}
+
+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) {
+		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_visible(struct window_pane *wp)
+{
+	if (~wp->window->flags & WINDOW_ZOOMED)
+		return (1);
+	return (wp == wp->window->active);
+}
+
+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);
+}
+
+/*
+ * 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;
+	u_int			 edge, left, right, end, size;
+	int			 status, found;
+
+	if (wp == NULL)
+		return (NULL);
+	w = wp->window;
+	status = options_get_number(w->options, "pane-border-status");
+
+	list = NULL;
+	size = 0;
+
+	edge = wp->yoff;
+	if (status == PANE_STATUS_TOP) {
+		if (edge == 1)
+			edge = w->sy + 1;
+	} else if (status == PANE_STATUS_BOTTOM) {
+		if (edge == 0)
+			edge = w->sy;
+	} else {
+		if (edge == 0)
+			edge = w->sy + 1;
+	}
+
+	left = wp->xoff;
+	right = wp->xoff + wp->sx;
+
+	TAILQ_FOREACH(next, &w->panes, entry) {
+		if (next == wp)
+			continue;
+		if (next->yoff + next->sy + 1 != edge)
+			continue;
+		end = next->xoff + next->sx - 1;
+
+		found = 0;
+		if (next->xoff < left && end > right)
+			found = 1;
+		else if (next->xoff >= left && next->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;
+	u_int			 edge, left, right, end, size;
+	int			 status, found;
+
+	if (wp == NULL)
+		return (NULL);
+	w = wp->window;
+	status = options_get_number(w->options, "pane-border-status");
+
+	list = NULL;
+	size = 0;
+
+	edge = wp->yoff + wp->sy + 1;
+	if (status == PANE_STATUS_TOP) {
+		if (edge >= w->sy)
+			edge = 1;
+	} else if (status == PANE_STATUS_BOTTOM) {
+		if (edge >= w->sy - 1)
+			edge = 0;
+	} else {
+		if (edge >= w->sy)
+			edge = 0;
+	}
+
+	left = wp->xoff;
+	right = wp->xoff + wp->sx;
+
+	TAILQ_FOREACH(next, &w->panes, entry) {
+		if (next == wp)
+			continue;
+		if (next->yoff != edge)
+			continue;
+		end = next->xoff + next->sx - 1;
+
+		found = 0;
+		if (next->xoff < left && end > right)
+			found = 1;
+		else if (next->xoff >= left && next->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;
+	u_int			 edge, top, bottom, end, size;
+	int			 found;
+
+	if (wp == NULL)
+		return (NULL);
+	w = wp->window;
+
+	list = NULL;
+	size = 0;
+
+	edge = wp->xoff;
+	if (edge == 0)
+		edge = w->sx + 1;
+
+	top = wp->yoff;
+	bottom = wp->yoff + wp->sy;
+
+	TAILQ_FOREACH(next, &w->panes, entry) {
+		if (next == wp)
+			continue;
+		if (next->xoff + next->sx + 1 != edge)
+			continue;
+		end = next->yoff + next->sy - 1;
+
+		found = 0;
+		if (next->yoff < top && end > bottom)
+			found = 1;
+		else if (next->yoff >= top && next->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;
+	u_int			 edge, top, bottom, end, size;
+	int			 found;
+
+	if (wp == NULL)
+		return (NULL);
+	w = wp->window;
+
+	list = NULL;
+	size = 0;
+
+	edge = wp->xoff + wp->sx + 1;
+	if (edge >= w->sx)
+		edge = 0;
+
+	top = wp->yoff;
+	bottom = wp->yoff + wp->sy;
+
+	TAILQ_FOREACH(next, &w->panes, entry) {
+		if (next == wp)
+			continue;
+		if (next->xoff != edge)
+			continue;
+		end = next->yoff + next->sy - 1;
+
+		found = 0;
+		if (next->yoff < top && end > bottom)
+			found = 1;
+		else if (next->yoff >= top && next->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);
+}
+
+/* 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)
+		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 (wp == NULL || closed || error != 0 || (c->flags & CLIENT_DEAD)) {
+		if (wp == NULL)
+			c->flags |= CLIENT_EXIT;
+
+		evbuffer_drain(buffer, len);
+		cmdq_continue(cdata->item);
+
+		server_client_unref(c);
+		free(cdata);
+		return;
+	}
+	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;
+
+	c->references++;
+	file_read(c, "-", window_pane_input_callback, cdata);
+
+	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_set_fill_character(struct window *w)
+{
+	const char		*value;
+	struct utf8_data	*ud;
+
+	free(w->fill_character);
+	w->fill_character = NULL;
+
+	value = options_get_string(w->options, "fill-character");
+	if (*value != '\0' && utf8_isvalid(value)) {
+		ud = utf8_fromcstr(value);
+		if (ud != NULL && ud[0].width == 1)
+			w->fill_character = ud;
+	}
+}