/* $OpenBSD$ */

/*

 * 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 <ctype.h>

#include <stdlib.h>

#include <string.h>

#include "tmux.h"

/*

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

 */

static enum args_parse_type cmd_if_shell_args_parse(struct args *, u_int,

            char **);

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, cmd_if_shell_args_parse },

  .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 args_command_state *cmd_if;

  struct args_command_state *cmd_else;

  struct client     *client;

  struct cmdq_item    *item;

};

static enum args_parse_type

cmd_if_shell_args_parse(__unused struct args *args, u_int idx,

    __unused char **cause)

{

  if (idx == 1 || idx == 2)

    return (ARGS_PARSE_COMMANDS_OR_STRING);

  return (ARGS_PARSE_STRING);

}

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 cmd_if_shell_data  *cdata;

  struct cmdq_item    *new_item;

  char        *shellcmd;

  struct client     *tc = cmdq_get_target_client(item);

  struct session      *s = target->s;

  struct cmd_list     *cmdlist;

  u_int        count = args_count(args);

  int        wait = !args_has(args, 'b');

  shellcmd = format_single_from_target(item, args_string(args, 0));

  if (args_has(args, 'F')) {

    if (*shellcmd != '0' && *shellcmd != '\0')

      cmdlist = args_make_commands_now(self, item, 1, 0);

    else if (count == 3)

      cmdlist = args_make_commands_now(self, item, 2, 0);

    else {

      free(shellcmd);

      return (CMD_RETURN_NORMAL);

    }

    free(shellcmd);

    if (cmdlist == NULL)

      return (CMD_RETURN_ERROR);

    new_item = cmdq_get_command(cmdlist, cmdq_get_state(item));

    cmdq_insert_after(item, new_item);

    return (CMD_RETURN_NORMAL);

  }

  cdata = xcalloc(1, sizeof *cdata);

  cdata->cmd_if = args_make_commands_prepare(self, item, 1, NULL, wait,

      0);

  if (count == 3) {

    cdata->cmd_else = args_make_commands_prepare(self, item, 2,

        NULL, wait, 0);

  }

  if (wait) {

    cdata->client = cmdq_get_client(item);

    cdata->item = item;

  } else

    cdata->client = tc;

  if (cdata->client != NULL)

    cdata->client->references++;

  if (job_run(shellcmd, 0, NULL, NULL, 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 (!wait)

    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    *item = cdata->item, *new_item;

  struct args_command_state *state;

  struct cmd_list     *cmdlist;

  char        *error;

  int        status;

  status = job_get_status(job);

  if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)

    state = cdata->cmd_else;

  else

    state = cdata->cmd_if;

  if (state == NULL)

    goto out;

  cmdlist = args_make_commands(state, 0, NULL, &error);

  if (cmdlist == NULL) {

    if (cdata->item == NULL) {

      *error = toupper((u_char)*error);

      status_message_set(c, -1, 1, 0, "%s", error);

    } else

      cmdq_error(cdata->item, "%s", error);

    free(error);

  } else if (item == NULL) {

    new_item = cmdq_get_command(cmdlist, NULL);

    cmdq_append(c, new_item);

  } else {

    new_item = cmdq_get_command(cmdlist, cmdq_get_state(item));

    cmdq_insert_after(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);

  if (cdata->cmd_else != NULL)

    args_make_commands_free(cdata->cmd_else);

  args_make_commands_free(cdata->cmd_if);

  free(cdata);

}