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When adding a list of commands to the queue, instead of automatically
creating a new state for each group of commands, require the caller to
create one and use it for all the commands in the list. This means the
current target works even with list with multiple groups (which can
happen if they are defined with newlines).

/* $OpenBSD: cmd-if-shell.c,v 1.72 2020/04/13 15:55:51 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 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]",

	.target = { 't', CMD_FIND_PANE, CMD_FIND_CANFAIL },

	.flags = 0,
	.exec = cmd_if_shell_exec
};

struct cmd_if_shell_data {
	struct cmd_parse_input	 input;

	char			*cmd_if;
	char			*cmd_else;

	struct client		*client;
	struct cmdq_item	*item;
};

static enum cmd_retval
cmd_if_shell_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args			*args = cmd_get_args(self);
	struct cmd_find_state		*target = cmdq_get_target(item);
	struct cmdq_state		*state = cmdq_get_state(item);
	struct cmd_if_shell_data	*cdata;
	char				*shellcmd, *cmd;
	const char			*file;
	struct cmdq_item		*new_item;
	struct client			*c = cmd_find_client(item, NULL, 1);
	struct session			*s = target->s;
	struct cmd_parse_input		 pi;
	struct cmd_parse_result		*pr;

	shellcmd = format_single_from_target(item, args->argv[0], c);
	if (args_has(args, 'F')) {
		if (*shellcmd != '0' && *shellcmd != '\0')
			cmd = args->argv[1];
		else if (args->argc == 3)
			cmd = args->argv[2];
		else
			cmd = NULL;
		free(shellcmd);
		if (cmd == NULL)
			return (CMD_RETURN_NORMAL);

		memset(&pi, 0, sizeof pi);
		cmd_get_source(self, &pi.file, &pi.line);
		pi.item = item;
		pi.c = c;
		cmd_find_copy_state(&pi.fs, target);

		pr = cmd_parse_from_string(cmd, &pi);
		switch (pr->status) {
		case CMD_PARSE_EMPTY:
			break;
		case CMD_PARSE_ERROR:
			cmdq_error(item, "%s", pr->error);
			free(pr->error);
			return (CMD_RETURN_ERROR);
		case CMD_PARSE_SUCCESS:
			new_item = cmdq_get_command(pr->cmdlist, state);
			cmdq_insert_after(item, new_item);
			cmd_list_free(pr->cmdlist);
			break;
		}
		return (CMD_RETURN_NORMAL);
	}

	cdata = xcalloc(1, sizeof *cdata);

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

	if (!args_has(args, 'b'))
		cdata->client = cmdq_get_client(item);
	else
		cdata->client = c;
	if (cdata->client != NULL)
		cdata->client->references++;

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

	memset(&cdata->input, 0, sizeof cdata->input);
	cmd_get_source(self, &file, &cdata->input.line);
	if (file != NULL)
		cdata->input.file = xstrdup(file);
	cdata->input.c = c;
	if (cdata->input.c != NULL)
		cdata->input.c->references++;
	cmd_find_copy_state(&cdata->input.fs, target);

	if (job_run(shellcmd, s,
	    server_client_get_cwd(cmdq_get_client(item), s), NULL,
	    cmd_if_shell_callback, cmd_if_shell_free, cdata, 0, -1,
	    -1) == NULL) {
		cmdq_error(item, "failed to run command: %s", shellcmd);
		free(shellcmd);
		free(cdata);
		return (CMD_RETURN_ERROR);
	}
	free(shellcmd);

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

static void
cmd_if_shell_callback(struct job *job)
{
	struct cmd_if_shell_data	*cdata = job_get_data(job);
	struct client			*c = cdata->client;
	struct cmdq_item		*new_item = NULL;
	struct cmdq_state		*new_state = NULL;
	char				*cmd;
	int				 status;
	struct cmd_parse_result		*pr;

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

	pr = cmd_parse_from_string(cmd, &cdata->input);
	switch (pr->status) {
	case CMD_PARSE_EMPTY:
		break;
	case CMD_PARSE_ERROR:
		if (cdata->item != NULL)
		       cmdq_error(cdata->item, "%s", pr->error);
		free(pr->error);
		break;
	case CMD_PARSE_SUCCESS:
		if (cdata->item == NULL)
			new_state = cmdq_new_state(NULL, NULL, 0);
		else
			new_state = cmdq_get_state(cdata->item);
		new_item = cmdq_get_command(pr->cmdlist, new_state);
		if (cdata->item == NULL)
			cmdq_free_state(new_state);
		cmd_list_free(pr->cmdlist);
		break;
	}
	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)
		cmdq_continue(cdata->item);
}

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

	if (cdata->client != NULL)
		server_client_unref(cdata->client);

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

	if (cdata->input.c != NULL)
		server_client_unref(cdata->input.c);
	free((void *)cdata->input.file);

	free(cdata);
}