/* $OpenBSD$ */

/*
* Copyright (c) 2009 Tiago Cunha <[email protected]>
* Copyright (c) 2009 Nicholas Marriott <[email protected]>
*
* 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);
}

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