get_xdg_user_dir_from_string (const char  *filesystem,
                              const char **config_key,
                              const char **suffix,
                              const char **dir)
{
  char *slash;
  const char *rest;
  g_autofree char *prefix;
  gsize len;

  slash = strchr (filesystem, '/');

  if (slash)
    len = slash - filesystem;
  else
    len = strlen (filesystem);

  rest = filesystem + len;
  while (*rest == '/')
    rest++;

  if (suffix)
    *suffix = rest;

  prefix = g_strndup (filesystem, len);

  if (strcmp (prefix, "xdg-desktop") == 0)
    {
      if (config_key)
        *config_key = "XDG_DESKTOP_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_DESKTOP);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-documents") == 0)
    {
      if (config_key)
        *config_key = "XDG_DOCUMENTS_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_DOCUMENTS);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-download") == 0)
    {
      if (config_key)
        *config_key = "XDG_DOWNLOAD_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_DOWNLOAD);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-music") == 0)
    {
      if (config_key)
        *config_key = "XDG_MUSIC_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_MUSIC);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-pictures") == 0)
    {
      if (config_key)
        *config_key = "XDG_PICTURES_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_PICTURES);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-public-share") == 0)
    {
      if (config_key)
        *config_key = "XDG_PUBLICSHARE_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_PUBLIC_SHARE);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-templates") == 0)
    {
      if (config_key)
        *config_key = "XDG_TEMPLATES_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_TEMPLATES);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-videos") == 0)
    {
      if (config_key)
        *config_key = "XDG_VIDEOS_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_VIDEOS);
      return TRUE;
    }
  if (get_xdg_dir_from_prefix (prefix, NULL, dir))
    {
      if (config_key)
        *config_key = NULL;
      return TRUE;
    }
  /* Don't support xdg-run without suffix, because that doesn't work */
  if (strcmp (prefix, "xdg-run") == 0 &&
      *rest != 0)
    {
      if (config_key)
        *config_key = NULL;
      if (dir)
        *dir = g_get_user_runtime_dir ();
      return TRUE;
    }

  return FALSE;
}
get_xdg_user_dir_from_string (const char  *filesystem,
                              const char **config_key,
                              const char **suffix,
                              const char **dir)
{
  char *slash;
  const char *rest;
  g_autofree char *prefix;
  gsize len;

  slash = strchr (filesystem, '/');

  if (slash)
    len = slash - filesystem;
  else
    len = strlen (filesystem);

  rest = filesystem + len;
  while (*rest == '/')
    rest++;

  if (suffix)
    *suffix = rest;

  prefix = g_strndup (filesystem, len);

  if (strcmp (prefix, "xdg-desktop") == 0)
    {
      if (config_key)
        *config_key = "XDG_DESKTOP_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_DESKTOP);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-documents") == 0)
    {
      if (config_key)
        *config_key = "XDG_DOCUMENTS_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_DOCUMENTS);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-download") == 0)
    {
      if (config_key)
        *config_key = "XDG_DOWNLOAD_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_DOWNLOAD);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-music") == 0)
    {
      if (config_key)
        *config_key = "XDG_MUSIC_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_MUSIC);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-pictures") == 0)
    {
      if (config_key)
        *config_key = "XDG_PICTURES_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_PICTURES);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-public-share") == 0)
    {
      if (config_key)
        *config_key = "XDG_PUBLICSHARE_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_PUBLIC_SHARE);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-templates") == 0)
    {
      if (config_key)
        *config_key = "XDG_TEMPLATES_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_TEMPLATES);
      return TRUE;
    }
  if (strcmp (prefix, "xdg-videos") == 0)
    {
      if (config_key)
        *config_key = "XDG_VIDEOS_DIR";
      if (dir)
        *dir = g_get_user_special_dir (G_USER_DIRECTORY_VIDEOS);
      return TRUE;
    }
  if (get_xdg_dir_from_prefix (prefix, NULL, dir))
    {
      if (config_key)
        *config_key = NULL;
      return TRUE;
    }
   
  if (strcmp (prefix, "xdg-run") == 0 &&
      *rest != 0)
    {
      if (config_key)
        *config_key = NULL;
      if (dir)
        *dir = g_get_user_runtime_dir ();
      return TRUE;
    }

  return FALSE;
}