/* vi:set et ai sw=2 sts=2 ts=2: */
/*-
 * Copyright (c) 2005-2007 Benedikt Meurer <benny@xfce.org>
 * Copyright (c) 2009 Jannis Pohlmann <jannis@xfce.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <glib.h>
#include <gio/gio.h>

#include <thunar/thunar-exec.h>
#include <thunar/thunar-private.h>



static void     te_string_append_quoted      (GString     *string,
                                              const gchar *unquoted);
static gboolean te_string_append_quoted_file (GString     *string,
                                              GFile       *file,
                                              GError     **error);
static void     te_string_append_quoted_uri  (GString     *string,
                                              GFile       *file);



static void
te_string_append_quoted (GString     *string,
                         const gchar *unquoted)
{
  gchar *quoted;

  quoted = g_shell_quote (unquoted);
  g_string_append (string, quoted);
  g_free (quoted);
}



static gboolean
te_string_append_quoted_file (GString *string,
                              GFile   *file,
                              GError **error)
{
  gboolean success = FALSE;
  gchar   *path;

  /* append the absolute, local, quoted path to the string */
  path = g_file_get_path (file);
  if (G_LIKELY (path != NULL))
    {
      te_string_append_quoted (string, path);
      success = TRUE;
      g_free (path);
    }

  return success;
}



static void
te_string_append_quoted_uri (GString *string,
                             GFile   *file)
{
  gchar *uri;

  /* append the quoted URI for the path */
  uri = g_file_get_uri (file);
  te_string_append_quoted (string, uri);
  g_free (uri);
}



/**
 * thunar_exec_parse:
 * @exec      : the value of the <literal>Exec</literal> field.
 * @file_list : the list of #GFile<!---->s.
 * @icon      : value of the <literal>Icon</literal> field or %NULL.
 * @name      : translated value for the <literal>Name</literal> field or %NULL.
 * @path      : full path to the desktop file or %NULL.
 * @terminal  : whether to execute the command in a terminal.
 * @argc      : return location for the number of items placed into @argv.
 * @argv      : return location for the argument vector.
 * @error     : return location for errors or %NULL.
 *
 * Substitutes <literal>Exec</literal> parameter variables according
 * to the <ulink href="https://freedesktop.org/wiki/Specifications/desktop-entry-spec"
 * type="http">Desktop Entry Specification</ulink> and returns the
 * parsed argument vector (in @argv) and the number of items placed
 * into @argv (in @argc).
 *
 * The @icon, @name and @path fields are optional and may be %NULL
 * if you don't know their values. The @icon parameter should be
 * the value of the <literal>Icon</literal> field from the desktop
 * file, the @name parameter should be the translated <literal>Name</literal>
 * value, while the @path parameter should refer to the full path
 * to the desktop file, whose <literal>Exec</literal> field is
 * being parsed here.
 *
 * Return value: %TRUE on success, else %FALSE.
 **/
gboolean
thunar_exec_parse (const gchar *exec,
                   GList       *file_list,
                   const gchar *icon,
                   const gchar *name,
                   const gchar *uri,
                   gboolean     terminal,
                   gint        *argc,
                   gchar     ***argv,
                   GError     **error)
{
  const gchar *p;
  gboolean     result = FALSE;
  GString     *command_line = g_string_new (NULL);
  GList       *lp;

  /* prepend terminal command if required */
  if (G_UNLIKELY (terminal))
    g_string_append (command_line, "exo-open --launch TerminalEmulator ");

  for (p = exec; *p != '\0'; ++p)
    {
      if (p[0] == '%' && p[1] != '\0')
        {
          switch (*++p)
            {
            case 'f':
              /* append the absolute local path of the first path object */
              if (file_list != NULL && !te_string_append_quoted_file (command_line, file_list->data, error))
                goto done;
              break;

            case 'F':
              for (lp = file_list; lp != NULL; lp = lp->next)
                {
                  if (G_LIKELY (lp != file_list))
                    g_string_append_c (command_line, ' ');
                  if (!te_string_append_quoted_file (command_line, lp->data, error))
                    goto done;
                }
              break;

            case 'u':
              if (G_LIKELY (file_list != NULL))
                te_string_append_quoted_uri (command_line, file_list->data);
              break;

            case 'U':
              for (lp = file_list; lp != NULL; lp = lp->next)
                {
                  if (G_LIKELY (lp != file_list))
                    g_string_append_c (command_line, ' ');
                  te_string_append_quoted_uri (command_line, lp->data);
                }
              break;

            case 'i':
              if (G_LIKELY (icon != NULL))
                {
                  g_string_append (command_line, "--icon ");
                  te_string_append_quoted (command_line, icon);
                }
              break;

            case 'c':
              if (G_LIKELY (name != NULL))
                te_string_append_quoted (command_line, name);
              break;

            case 'k':
              if (G_LIKELY (uri != NULL))
                te_string_append_quoted (command_line, uri);
              break;

            case '%':
              g_string_append_c (command_line, '%');
              break;
            }
        }
      else
        {
          g_string_append_c (command_line, *p);
        }
    }

  result = g_shell_parse_argv (command_line->str, argc, argv, error);

done:
  g_string_free (command_line, TRUE);
  return result;
}