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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: cmd-join-pane.c,v 1.14 2013/03/24 09:57:59 nicm Exp $ */

/*
 * Copyright (c) 2011 George Nachman <tmux@georgester.com>
 * Copyright (c) 2009 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 <paths.h>
#include <stdlib.h>
#include <unistd.h>

#include "tmux.h"

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

void		 cmd_join_pane_key_binding(struct cmd *, int);
enum cmd_retval	 cmd_join_pane_exec(struct cmd *, struct cmd_q *);

enum cmd_retval	 join_pane(struct cmd *, struct cmd_q *, int);

const struct cmd_entry cmd_join_pane_entry = {
	"join-pane", "joinp",
	"bdhvp:l:s:t:", 0, 0,
	"[-bdhv] [-p percentage|-l size] [-s src-pane] [-t dst-pane]",
	0,
	cmd_join_pane_key_binding,
	NULL,
	cmd_join_pane_exec
};

const struct cmd_entry cmd_move_pane_entry = {
	"move-pane", "movep",
	"bdhvp:l:s:t:", 0, 0,
	"[-bdhv] [-p percentage|-l size] [-s src-pane] [-t dst-pane]",
	0,
	NULL,
	NULL,
	cmd_join_pane_exec
};

void
cmd_join_pane_key_binding(struct cmd *self, int key)
{
	switch (key) {
	case '%':
		self->args = args_create(0);
		args_set(self->args, 'h', NULL);
		break;
	default:
		self->args = args_create(0);
		break;
	}
}

enum cmd_retval
cmd_join_pane_exec(struct cmd *self, struct cmd_q *cmdq)
{
	return (join_pane(self, cmdq, self->entry == &cmd_join_pane_entry));
}

enum cmd_retval
join_pane(struct cmd *self, struct cmd_q *cmdq, int not_same_window)
{
	struct args		*args = self->args;
	struct session		*dst_s;
	struct winlink		*src_wl, *dst_wl;
	struct window		*src_w, *dst_w;
	struct window_pane	*src_wp, *dst_wp;
	char			*cause;
	int			 size, percentage, dst_idx;
	enum layout_type	 type;
	struct layout_cell	*lc;

	dst_wl = cmd_find_pane(cmdq, args_get(args, 't'), &dst_s, &dst_wp);
	if (dst_wl == NULL)
		return (CMD_RETURN_ERROR);
	dst_w = dst_wl->window;
	dst_idx = dst_wl->idx;
	server_unzoom_window(dst_w);

	src_wl = cmd_find_pane(cmdq, args_get(args, 's'), NULL, &src_wp);
	if (src_wl == NULL)
		return (CMD_RETURN_ERROR);
	src_w = src_wl->window;
	server_unzoom_window(src_w);

	if (not_same_window && src_w == dst_w) {
		cmdq_error(cmdq, "can't join a pane to its own window");
		return (CMD_RETURN_ERROR);
	}
	if (!not_same_window && src_wp == dst_wp) {
		cmdq_error(cmdq, "source and target panes must be different");
		return (CMD_RETURN_ERROR);
	}

	type = LAYOUT_TOPBOTTOM;
	if (args_has(args, 'h'))
		type = LAYOUT_LEFTRIGHT;

	size = -1;
	if (args_has(args, 'l')) {
		size = args_strtonum(args, 'l', 0, INT_MAX, &cause);
		if (cause != NULL) {
			cmdq_error(cmdq, "size %s", cause);
			free(cause);
			return (CMD_RETURN_ERROR);
		}
	} else if (args_has(args, 'p')) {
		percentage = args_strtonum(args, 'p', 0, 100, &cause);
		if (cause != NULL) {
			cmdq_error(cmdq, "percentage %s", cause);
			free(cause);
			return (CMD_RETURN_ERROR);
		}
		if (type == LAYOUT_TOPBOTTOM)
			size = (dst_wp->sy * percentage) / 100;
		else
			size = (dst_wp->sx * percentage) / 100;
	}
	lc = layout_split_pane(dst_wp, type, size, args_has(args, 'b'));
	if (lc == NULL) {
		cmdq_error(cmdq, "create pane failed: pane too small");
		return (CMD_RETURN_ERROR);
	}

	layout_close_pane(src_wp);

	if (src_w->active == src_wp) {
		src_w->active = TAILQ_PREV(src_wp, window_panes, entry);
		if (src_w->active == NULL)
			src_w->active = TAILQ_NEXT(src_wp, entry);
	}
	TAILQ_REMOVE(&src_w->panes, src_wp, entry);

	if (window_count_panes(src_w) == 0)
		server_kill_window(src_w);
	else
		notify_window_layout_changed(src_w);

	src_wp->window = dst_w;
	TAILQ_INSERT_AFTER(&dst_w->panes, dst_wp, src_wp, entry);
	layout_assign_pane(lc, src_wp);

	recalculate_sizes();

	server_redraw_window(src_w);
	server_redraw_window(dst_w);

	if (!args_has(args, 'd')) {
		window_set_active_pane(dst_w, src_wp);
		session_select(dst_s, dst_idx);
		server_redraw_session(dst_s);
	} else
		server_status_session(dst_s);

	notify_window_layout_changed(dst_w);
	return (CMD_RETURN_NORMAL);
}