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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-if-shell.c,v 1.50 2017/02/03 11:57:27 nicm Exp $ */

/*
 * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
 * Copyright (c) 2009 Nicholas Marriott <nicm@openbsd.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 <sys/wait.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Executes a tmux command if a shell command returns true or false.
 */

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

static enum cmd_retval	cmd_if_shell_error(struct cmdq_item *, void *);
static void		cmd_if_shell_callback(struct job *);
static void		cmd_if_shell_free(void *);

const struct cmd_entry cmd_if_shell_entry = {
	.name = "if-shell",
	.alias = "if",

	.args = { "bFt:", 2, 3 },
	.usage = "[-bF] " CMD_TARGET_PANE_USAGE " shell-command command "
		 "[command]",

	.tflag = CMD_PANE_CANFAIL,

	.flags = 0,
	.exec = cmd_if_shell_exec
};

struct cmd_if_shell_data {
	char			*file;
	u_int			 line;

	char			*cmd_if;
	char			*cmd_else;

	struct client		*client;
	struct cmdq_item	*item;
	struct mouse_event	 mouse;
};

static enum cmd_retval
cmd_if_shell_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args			*args = self->args;
	struct cmd_if_shell_data	*cdata;
	char				*shellcmd, *cmd, *cause;
	struct cmd_list			*cmdlist;
	struct cmdq_item		*new_item;
	struct session			*s = item->state.tflag.s;
	struct winlink			*wl = item->state.tflag.wl;
	struct window_pane		*wp = item->state.tflag.wp;
	struct format_tree		*ft;
	const char			*cwd;

	if (item->client != NULL && item->client->session == NULL)
		cwd = item->client->cwd;
	else if (s != NULL)
		cwd = s->cwd;
	else
		cwd = NULL;

	ft = format_create(item, FORMAT_NONE, 0);
	format_defaults(ft, item->state.c, s, wl, wp);
	shellcmd = format_expand(ft, args->argv[0]);
	format_free(ft);

	if (args_has(args, 'F')) {
		cmd = NULL;
		if (*shellcmd != '0' && *shellcmd != '\0')
			cmd = args->argv[1];
		else if (args->argc == 3)
			cmd = args->argv[2];
		free(shellcmd);
		if (cmd == NULL)
			return (CMD_RETURN_NORMAL);
		cmdlist = cmd_string_parse(cmd, NULL, 0, &cause);
		if (cmdlist == NULL) {
			if (cause != NULL) {
				cmdq_error(item, "%s", cause);
				free(cause);
			}
			return (CMD_RETURN_ERROR);
		}
		new_item = cmdq_get_command(cmdlist, NULL, &item->mouse, 0);
		cmdq_insert_after(item, new_item);
		cmd_list_free(cmdlist);
		return (CMD_RETURN_NORMAL);
	}

	cdata = xcalloc(1, sizeof *cdata);
	if (self->file != NULL) {
		cdata->file = xstrdup(self->file);
		cdata->line = self->line;
	}

	cdata->cmd_if = xstrdup(args->argv[1]);
	if (args->argc == 3)
		cdata->cmd_else = xstrdup(args->argv[2]);
	else
		cdata->cmd_else = NULL;

	cdata->client = item->client;
	cdata->client->references++;

	if (!args_has(args, 'b'))
		cdata->item = item;
	else
		cdata->item = NULL;
	memcpy(&cdata->mouse, &item->mouse, sizeof cdata->mouse);

	job_run(shellcmd, s, cwd, cmd_if_shell_callback, cmd_if_shell_free,
	    cdata);
	free(shellcmd);

	if (args_has(args, 'b'))
		return (CMD_RETURN_NORMAL);
	return (CMD_RETURN_WAIT);
}

static enum cmd_retval
cmd_if_shell_error(struct cmdq_item *item, void *data)
{
	char	*error = data;

	cmdq_error(item, "%s", error);
	free(error);

	return (CMD_RETURN_NORMAL);
}

static void
cmd_if_shell_callback(struct job *job)
{
	struct cmd_if_shell_data	*cdata = job->data;
	struct client			*c = cdata->client;
	struct cmd_list			*cmdlist;
	struct cmdq_item		*new_item;
	char				*cause, *cmd, *file = cdata->file;
	u_int				 line = cdata->line;

	if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0)
		cmd = cdata->cmd_else;
	else
		cmd = cdata->cmd_if;
	if (cmd == NULL)
		goto out;

	cmdlist = cmd_string_parse(cmd, file, line, &cause);
	if (cmdlist == NULL) {
		if (cause != NULL)
			new_item = cmdq_get_callback(cmd_if_shell_error, cause);
		else
			new_item = NULL;
	} else {
		new_item = cmdq_get_command(cmdlist, NULL, &cdata->mouse, 0);
		cmd_list_free(cmdlist);
	}

	if (new_item != NULL) {
		if (cdata->item == NULL)
			cmdq_append(c, new_item);
		else
			cmdq_insert_after(cdata->item, new_item);
	}

out:
	if (cdata->item != NULL)
		cdata->item->flags &= ~CMDQ_WAITING;
}

static void
cmd_if_shell_free(void *data)
{
	struct cmd_if_shell_data	*cdata = data;

	server_client_unref(cdata->client);

	free(cdata->cmd_else);
	free(cdata->cmd_if);

	free(cdata->file);
	free(cdata);
}