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Give each client a name. This defaults to the tty name as before but
falls back to an alternative if the tty name is not available. This is
clearer than overloading the client ttyname member and allows us to
remove the path stored in the tty struct, it should always be the same
as the client.

/* $OpenBSD: cmd-choose-client.c,v 1.32 2017/04/05 10:49:46 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 <ctype.h>
#include <stdlib.h>

#include "tmux.h"

/*
 * Enter choice mode to choose a client.
 */

#define CHOOSE_CLIENT_TEMPLATE					\
	"#{client_name}: #{session_name} "			\
	"[#{client_width}x#{client_height} #{client_termname}]"	\
	"#{?client_utf8, (utf8),}#{?client_readonly, (ro),} "	\
	"(last used #{t:client_activity})"

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

static void	cmd_choose_client_callback(struct window_choose_data *);

const struct cmd_entry cmd_choose_client_entry = {
	.name = "choose-client",
	.alias = NULL,

	.args = { "F:t:", 0, 1 },
	.usage = CMD_TARGET_WINDOW_USAGE " [-F format] [template]",

	.tflag = CMD_WINDOW,

	.flags = 0,
	.exec = cmd_choose_client_exec
};

struct cmd_choose_client_data {
	struct client	*client;
};

static enum cmd_retval
cmd_choose_client_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args			*args = self->args;
	struct client			*c = item->state.c;
	struct client			*c1;
	struct window_choose_data	*cdata;
	struct winlink			*wl = item->state.tflag.wl;
	const char			*template;
	char				*action;
	u_int			 	 idx, cur;

	if (c == NULL) {
		cmdq_error(item, "no client available");
		return (CMD_RETURN_ERROR);
	}

	if (window_pane_set_mode(wl->window->active, &window_choose_mode) != 0)
		return (CMD_RETURN_NORMAL);

	if ((template = args_get(args, 'F')) == NULL)
		template = CHOOSE_CLIENT_TEMPLATE;

	if (args->argc != 0)
		action = xstrdup(args->argv[0]);
	else
		action = xstrdup("detach-client -t '%%'");

	cur = idx = 0;
	TAILQ_FOREACH(c1, &clients, entry) {
		if (c1->session == NULL)
			continue;
		if (c1 == item->client)
			cur = idx;

		cdata = window_choose_data_create(TREE_OTHER, c, c->session);
		cdata->idx = idx;

		cdata->ft_template = xstrdup(template);
		format_add(cdata->ft, "line", "%u", idx);
		format_defaults(cdata->ft, c1, NULL, NULL, NULL);

		cdata->command = cmd_template_replace(action, c1->name, 1);

		window_choose_add(wl->window->active, cdata);

		idx++;
	}
	free(action);

	window_choose_ready(wl->window->active, cur,
	    cmd_choose_client_callback);

	return (CMD_RETURN_NORMAL);
}

static void
cmd_choose_client_callback(struct window_choose_data *cdata)
{
	struct client  	*c;
	u_int		 idx;

	if (cdata == NULL)
		return;
	if (cdata->start_client->flags & CLIENT_DEAD)
		return;

	idx = 0;
	TAILQ_FOREACH(c, &clients, entry) {
		if (idx == cdata->idx)
			break;
		idx++;
	}
	if (c == NULL || c->session == NULL)
		return;

	window_choose_data_run(cdata);
}