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Add resize-pane -Z to temporary zoom the active pane to occupy the full
window or unzoom (restored to the normal layout) if it already zoomed,
bound to C-b z by default. The pane is unzoomed on pretty much any
excuse whatsoever.

We considered making this a new layout but the requirements are quite
different from layouts so decided it is better as a special case. Each
current layout cell is saved, a temporary one-cell layout generated and
all except the active pane set to NULL.

Prompted by suggestions and scripts from several. Thanks to Aaron Jensen
and Thiago Padilha for testing an earlier version.

/* $OpenBSD: resize.c,v 1.10 2013/03/24 09:57:59 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 <string.h>

#include "tmux.h"

/*
 * Recalculate window and session sizes.
 *
 * Every session has the size of the smallest client it is attached to and
 * every window the size of the smallest session it is attached to.
 *
 * So, when a client is resized or a session attached to or detached from a
 * client, the window sizes must be recalculated. For each session, find the
 * smallest client it is attached to, and resize it to that size. Then for
 * every window, find the smallest session it is attached to, resize it to that
 * size and clear and redraw every client with it as the current window.
 *
 * This is quite inefficient - better/additional data structures are needed
 * to make it better.
 *
 * As a side effect, this function updates the SESSION_UNATTACHED flag. This
 * flag is necessary to make sure unattached sessions do not limit the size of
 * windows that are attached both to them and to other (attached) sessions.
 */

void
recalculate_sizes(void)
{
	struct session		*s;
	struct client		*c;
	struct window		*w;
	struct window_pane	*wp;
	u_int			 i, j, ssx, ssy, has, limit;
	int			 flag, has_status, is_zoomed;

	RB_FOREACH(s, sessions, &sessions) {
		has_status = options_get_number(&s->options, "status");

		ssx = ssy = UINT_MAX;
		for (j = 0; j < ARRAY_LENGTH(&clients); j++) {
			c = ARRAY_ITEM(&clients, j);
			if (c == NULL || c->flags & CLIENT_SUSPENDED)
				continue;
			if (c->session == s) {
				if (c->tty.sx < ssx)
					ssx = c->tty.sx;
				if (has_status &&
				    !(c->flags & CLIENT_CONTROL) &&
				    c->tty.sy > 1 && c->tty.sy - 1 < ssy)
					ssy = c->tty.sy - 1;
				else if (c->tty.sy < ssy)
					ssy = c->tty.sy;
			}
		}
		if (ssx == UINT_MAX || ssy == UINT_MAX) {
			s->flags |= SESSION_UNATTACHED;
			continue;
		}
		s->flags &= ~SESSION_UNATTACHED;

		if (has_status && ssy == 0)
			ssy = 1;

		if (s->sx == ssx && s->sy == ssy)
			continue;

		log_debug("session size %u,%u (was %u,%u)", ssx, ssy, s->sx,
		    s->sy);

		s->sx = ssx;
		s->sy = ssy;
	}

	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
		w = ARRAY_ITEM(&windows, i);
		if (w == NULL)
			continue;
		flag = options_get_number(&w->options, "aggressive-resize");

		ssx = ssy = UINT_MAX;
		RB_FOREACH(s, sessions, &sessions) {
			if (s->flags & SESSION_UNATTACHED)
				continue;
			if (flag)
				has = s->curw->window == w;
			else
				has = session_has(s, w) != NULL;
			if (has) {
				if (s->sx < ssx)
					ssx = s->sx;
				if (s->sy < ssy)
					ssy = s->sy;
			}
		}
		if (ssx == UINT_MAX || ssy == UINT_MAX)
			continue;

		limit = options_get_number(&w->options, "force-width");
		if (limit != 0 && ssx > limit)
			ssx = limit;
		limit = options_get_number(&w->options, "force-height");
		if (limit != 0 && ssy > limit)
			ssy = limit;

		if (w->sx == ssx && w->sy == ssy)
			continue;
		log_debug("window size %u,%u (was %u,%u)", ssx, ssy, w->sx,
		    w->sy);

		is_zoomed = w->flags & WINDOW_ZOOMED;
		if (is_zoomed)
			window_unzoom(w);
		layout_resize(w, ssx, ssy);
		window_resize(w, ssx, ssy);
		if (is_zoomed && window_pane_visible(w->active))
			window_zoom(w->active);

		/*
		 * If the current pane is now not visible, move to the next
		 * that is.
		 */
		wp = w->active;
		while (!window_pane_visible(w->active)) {
			w->active = TAILQ_PREV(w->active, window_panes, entry);
			if (w->active == NULL)
				w->active = TAILQ_LAST(&w->panes, window_panes);
			if (w->active == wp)
			       break;
		}

		server_redraw_window(w);
		notify_window_layout_changed(w);
	}
}