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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: cfg.c,v 1.54 2017/02/03 11:57:27 nicm Exp $ */

/*
 * Copyright (c) 2008 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

#include "tmux.h"

char		 *cfg_file;
int		  cfg_finished;
static char	**cfg_causes;
static u_int	  cfg_ncauses;
struct client	 *cfg_client;

static enum cmd_retval
cfg_done(__unused struct cmdq_item *item, __unused void *data)
{
	if (cfg_finished)
		return (CMD_RETURN_NORMAL);
	cfg_finished = 1;

	if (!RB_EMPTY(&sessions))
		cfg_show_causes(RB_MIN(sessions, &sessions));

	if (cfg_client != NULL)
		server_client_unref(cfg_client);
	return (CMD_RETURN_NORMAL);
}

void
set_cfg_file(const char *path)
{
	free(cfg_file);
	cfg_file = xstrdup(path);
}

void
start_cfg(void)
{
	const char	*home;
	int		 quiet = 0;

	cfg_client = TAILQ_FIRST(&clients);
	if (cfg_client != NULL)
		cfg_client->references++;

	load_cfg(TMUX_CONF, cfg_client, NULL, 1);

	if (cfg_file == NULL && (home = find_home()) != NULL) {
		xasprintf(&cfg_file, "%s/.tmux.conf", home);
		quiet = 1;
	}
	if (cfg_file != NULL)
		load_cfg(cfg_file, cfg_client, NULL, quiet);

	cmdq_append(cfg_client, cmdq_get_callback(cfg_done, NULL));
}

int
load_cfg(const char *path, struct client *c, struct cmdq_item *item, int quiet)
{
	FILE			*f;
	const char		 delim[3] = { '\\', '\\', '\0' };
	u_int			 found = 0;
	size_t			 line = 0;
	char			*buf, *cause1, *p, *q, *s;
	struct cmd_list		*cmdlist;
	struct cmdq_item	*new_item;
	int			 condition = 0;
	struct format_tree	*ft;

	log_debug("loading %s", path);
	if ((f = fopen(path, "rb")) == NULL) {
		if (errno == ENOENT && quiet)
			return (0);
		cfg_add_cause("%s: %s", path, strerror(errno));
		return (-1);
	}

	while ((buf = fparseln(f, NULL, &line, delim, 0)) != NULL) {
		log_debug("%s: %s", path, buf);

		p = buf;
		while (isspace((u_char)*p))
			p++;
		if (*p == '\0') {
			free(buf);
			continue;
		}
		q = p + strlen(p) - 1;
		while (q != p && isspace((u_char)*q))
			*q-- = '\0';

		if (condition != 0 && strcmp(p, "%endif") == 0) {
			condition = 0;
			continue;
		}
		if (strncmp(p, "%if ", 4) == 0) {
			if (condition != 0) {
				cfg_add_cause("%s:%zu: nested %%if", path,
				    line);
				continue;
			}
			ft = format_create(NULL, FORMAT_NONE, FORMAT_NOJOBS);

			s = p + 3;
			while (isspace((u_char)*s))
				s++;
			s = format_expand(ft, s);
			if (*s != '\0' && (s[0] != '0' || s[1] != '\0'))
				condition = 1;
			else
				condition = -1;
			free(s);

			format_free(ft);
			continue;
		}
		if (condition == -1)
			continue;

		cmdlist = cmd_string_parse(p, path, line, &cause1);
		if (cmdlist == NULL) {
			free(buf);
			if (cause1 == NULL)
				continue;
			cfg_add_cause("%s:%zu: %s", path, line, cause1);
			free(cause1);
			continue;
		}
		free(buf);

		if (cmdlist == NULL)
			continue;
		new_item = cmdq_get_command(cmdlist, NULL, NULL, 0);
		if (item != NULL)
			cmdq_insert_after(item, new_item);
		else
			cmdq_append(c, new_item);
		cmd_list_free(cmdlist);

		found++;
	}
	fclose(f);

	return (found);
}

void
cfg_add_cause(const char *fmt, ...)
{
	va_list	 ap;
	char	*msg;

	va_start(ap, fmt);
	xvasprintf(&msg, fmt, ap);
	va_end(ap);

	cfg_ncauses++;
	cfg_causes = xreallocarray(cfg_causes, cfg_ncauses, sizeof *cfg_causes);
	cfg_causes[cfg_ncauses - 1] = msg;
}

void
cfg_print_causes(struct cmdq_item *item)
{
	u_int	 i;

	for (i = 0; i < cfg_ncauses; i++) {
		cmdq_print(item, "%s", cfg_causes[i]);
		free(cfg_causes[i]);
	}

	free(cfg_causes);
	cfg_causes = NULL;
	cfg_ncauses = 0;
}

void
cfg_show_causes(struct session *s)
{
	struct window_pane	*wp;
	u_int			 i;

	if (s == NULL || cfg_ncauses == 0)
		return;
	wp = s->curw->window->active;

	window_pane_set_mode(wp, &window_copy_mode);
	window_copy_init_for_output(wp);
	for (i = 0; i < cfg_ncauses; i++) {
		window_copy_add(wp, "%s", cfg_causes[i]);
		free(cfg_causes[i]);
	}

	free(cfg_causes);
	cfg_causes = NULL;
	cfg_ncauses = 0;
}