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Rewrite of the target resolution internals to be simpler and more
consistent but with much less duplication, but keeping the same internal
API. Also adds more readable aliases for some of the special tokens used
in targets (eg "{start}" instead of "^"). Some behaviours may have
changed, for example prefix matches now happen before fnmatch.

/* $OpenBSD: cmd-display-message.c,v 1.28 2015/04/27 16:25:57 nicm Exp $ */

/*
 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
 *
 * 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 <time.h>

#include "tmux.h"

/*
 * Displays a message in the status line.
 */

#define DISPLAY_MESSAGE_TEMPLATE			\
	"[#{session_name}] #{window_index}:"		\
	"#{window_name}, current pane #{pane_index} "	\
	"- (%H:%M %d-%b-%y)"

enum cmd_retval	 cmd_display_message_exec(struct cmd *, struct cmd_q *);

const struct cmd_entry cmd_display_message_entry = {
	"display-message", "display",
	"c:pt:F:", 0, 1,
	"[-p] [-c target-client] [-F format] " CMD_TARGET_PANE_USAGE
	" [message]",
	0,
	cmd_display_message_exec
};

enum cmd_retval
cmd_display_message_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct client		*c;
	struct session		*s;
	struct winlink		*wl;
	struct window_pane	*wp;
	const char		*template;
	char			*msg;
	struct format_tree	*ft;
	char			 out[BUFSIZ];
	time_t			 t;
	size_t			 len;

	if (args_has(args, 't')) {
		wl = cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp);
		if (wl == NULL)
			return (CMD_RETURN_ERROR);
	} else {
		wl = cmd_find_pane(cmdq, NULL, &s, &wp);
		if (wl == NULL)
			return (CMD_RETURN_ERROR);
	}

	if (args_has(args, 'F') && args->argc != 0) {
		cmdq_error(cmdq, "only one of -F or argument must be given");
		return (CMD_RETURN_ERROR);
	}

	if (args_has(args, 'c')) {
		c = cmd_find_client(cmdq, args_get(args, 'c'), 0);
		if (c == NULL)
			return (CMD_RETURN_ERROR);
	} else {
		c = cmd_find_client(cmdq, NULL, 1);
		if (c == NULL && !args_has(self->args, 'p')) {
			cmdq_error(cmdq, "no client available");
			return (CMD_RETURN_ERROR);
		}
	}

	template = args_get(args, 'F');
	if (args->argc != 0)
		template = args->argv[0];
	if (template == NULL)
		template = DISPLAY_MESSAGE_TEMPLATE;

	ft = format_create();
	format_defaults(ft, c, s, wl, wp);

	t = time(NULL);
	len = strftime(out, sizeof out, template, localtime(&t));
	out[len] = '\0';

	msg = format_expand(ft, out);
	if (args_has(self->args, 'p'))
		cmdq_print(cmdq, "%s", msg);
	else
		status_message_set(c, "%s", msg);
	free(msg);
	format_free(ft);

	return (CMD_RETURN_NORMAL);
}