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Add a window or pane id "tag" to each format tree and use it to separate
jobs, this means that if the same job is used for different windows or
panes (for example in pane-border-format), it will be run separately for
each pane.

/* $OpenBSD: cmd-break-pane.c,v 1.42 2017/02/03 11:57:27 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>

#include "tmux.h"

/*
 * Break pane off into a window.
 */

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

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

const struct cmd_entry cmd_break_pane_entry = {
	.name = "break-pane",
	.alias = "breakp",

	.args = { "dPF:n:s:t:", 0, 0 },
	.usage = "[-dP] [-F format] [-n window-name] [-s src-pane] [-t dst-window]",

	.sflag = CMD_PANE,
	.tflag = CMD_WINDOW_INDEX,

	.flags = 0,
	.exec = cmd_break_pane_exec
};

static enum cmd_retval
cmd_break_pane_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = self->args;
	struct winlink		*wl = item->state.sflag.wl;
	struct session		*src_s = item->state.sflag.s;
	struct session		*dst_s = item->state.tflag.s;
	struct window_pane	*wp = item->state.sflag.wp;
	struct window		*w = wl->window;
	char			*name, *cause;
	int			 idx = item->state.tflag.idx;
	struct format_tree	*ft;
	const char		*template;
	char			*cp;

	if (idx != -1 && winlink_find_by_index(&dst_s->windows, idx) != NULL) {
		cmdq_error(item, "index %d already in use", idx);
		return (CMD_RETURN_ERROR);
	}

	if (window_count_panes(w) == 1) {
		cmdq_error(item, "can't break with only one pane");
		return (CMD_RETURN_ERROR);
	}
	server_unzoom_window(w);

	TAILQ_REMOVE(&w->panes, wp, entry);
	window_lost_pane(w, wp);
	layout_close_pane(wp);

	w = wp->window = window_create(dst_s->sx, dst_s->sy);
	TAILQ_INSERT_HEAD(&w->panes, wp, entry);
	w->active = wp;

	if (!args_has(args, 'n')) {
		name = default_window_name(w);
		window_set_name(w, name);
		free(name);
	} else {
		window_set_name(w, args_get(args, 'n'));
		options_set_number(w->options, "automatic-rename", 0);
	}

	layout_init(w, wp);
	wp->flags |= PANE_CHANGED;

	if (idx == -1)
		idx = -1 - options_get_number(dst_s->options, "base-index");
	wl = session_attach(dst_s, w, idx, &cause); /* can't fail */
	if (!args_has(self->args, 'd'))
		session_select(dst_s, wl->idx);

	server_redraw_session(src_s);
	if (src_s != dst_s)
		server_redraw_session(dst_s);
	server_status_session_group(src_s);
	if (src_s != dst_s)
		server_status_session_group(dst_s);

	if (args_has(args, 'P')) {
		if ((template = args_get(args, 'F')) == NULL)
			template = BREAK_PANE_TEMPLATE;

		ft = format_create(item, FORMAT_NONE, 0);
		format_defaults(ft, item->state.c, dst_s, wl, wp);

		cp = format_expand(ft, template);
		cmdq_print(item, "%s", cp);
		free(cp);

		format_free(ft);
	}
	return (CMD_RETURN_NORMAL);
}