text: /* $Id$ */
  
  /*
   * 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.
   */
  
  enum cmd_retval	 cmd_if_shell_exec(struct cmd *, struct cmd_q *);
  
  void	cmd_if_shell_callback(struct job *);
  void	cmd_if_shell_done(struct cmd_q *);
  void	cmd_if_shell_free(void *);
  
  const struct cmd_entry cmd_if_shell_entry = {
  	"if-shell", "if",
  	"bt:", 2, 3,
  	"[-b] " CMD_TARGET_PANE_USAGE " shell-command command [command]",
  	0,
  	NULL,
  	NULL,
  	cmd_if_shell_exec
  };
  
  struct cmd_if_shell_data {
  	char		*cmd_if;
  	char		*cmd_else;
  	struct cmd_q	*cmdq;
  	int		 bflag;
  	int		 started;
  };
  
  enum cmd_retval
  cmd_if_shell_exec(struct cmd *self, struct cmd_q *cmdq)
  {
  	struct args			*args = self->args;
  	struct cmd_if_shell_data	*cdata;
  	char				*shellcmd;
  	struct client			*c;
  	struct session			*s = NULL;
  	struct winlink			*wl = NULL;
  	struct window_pane		*wp = NULL;
  	struct format_tree		*ft;
  
  	if (args_has(args, 't'))
  		wl = cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp);
  	else {
  		c = cmd_find_client(cmdq, NULL, 1);
  		if (c != NULL && c->session != NULL) {
  			s = c->session;
  			wl = s->curw;
  			wp = wl->window->active;
  		}
  	}
  
  	ft = format_create();
  	if (s != NULL)
  		format_session(ft, s);
  	if (s != NULL && wl != NULL)
  		format_winlink(ft, s, wl);
  	if (wp != NULL)
  		format_window_pane(ft, wp);
  	shellcmd = format_expand(ft, args->argv[0]);
  	format_free(ft);
  
  	cdata = xmalloc(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;
  	cdata->bflag = args_has(args, 'b');
  
  	cdata->started = 0;
  	cdata->cmdq = cmdq;
  	cmdq->references++;
  
  	job_run(shellcmd, s, cmd_if_shell_callback, cmd_if_shell_free, cdata);
  	free(shellcmd);
  
  	if (cdata->bflag)
  		return (CMD_RETURN_NORMAL);
  	return (CMD_RETURN_WAIT);
  }
  
  void
  cmd_if_shell_callback(struct job *job)
  {
  	struct cmd_if_shell_data	*cdata = job->data;
  	struct cmd_q			*cmdq = cdata->cmdq, *cmdq1;
  	struct cmd_list			*cmdlist;
  	char				*cause, *cmd;
  
  	if (cmdq->dead)
  		return;
  
  	if (!WIFEXITED(job->status) || WEXITSTATUS(job->status) != 0)
  		cmd = cdata->cmd_else;
  	else
  		cmd = cdata->cmd_if;
  	if (cmd == NULL)
  		return;
  
  	if (cmd_string_parse(cmd, &cmdlist, NULL, 0, &cause) != 0) {
  		if (cause != NULL) {
  			cmdq_error(cmdq, "%s", cause);
  			free(cause);
  		}
  		return;
  	}
  
  	cdata->started = 1;
  
  	cmdq1 = cmdq_new(cmdq->client);
  	cmdq1->emptyfn = cmd_if_shell_done;
  	cmdq1->data = cdata;
  
  	cmdq_run(cmdq1, cmdlist);
  	cmd_list_free(cmdlist);
  }
  
  void
  cmd_if_shell_done(struct cmd_q *cmdq1)
  {
  	struct cmd_if_shell_data	*cdata = cmdq1->data;
  	struct cmd_q			*cmdq = cdata->cmdq;
  
  	if (!cmdq_free(cmdq) && !cdata->bflag)
  		cmdq_continue(cmdq);
  
  	cmdq_free(cmdq1);
  
  	free(cdata->cmd_else);
  	free(cdata->cmd_if);
  	free(cdata);
  }
  
  void
  cmd_if_shell_free(void *data)
  {
  	struct cmd_if_shell_data	*cdata = data;
  	struct cmd_q			*cmdq = cdata->cmdq;
  
  	if (cdata->started)
  		return;
  
  	if (!cmdq_free(cmdq) && !cdata->bflag)
  		cmdq_continue(cmdq);
  
  	free(cdata->cmd_else);
  	free(cdata->cmd_if);
  	free(cdata);
  }
  