/* LIBGIMP - The GIMP Library
 * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
 *
 * Datafiles module copyight (C) 1996 Federico Mena Quintero
 * federico@nuclecu.unam.mx
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <glib-object.h>
#include <glib/gstdio.h>

#ifdef G_OS_WIN32
#include "gimpwin32-io.h"
#endif /* G_OS_WIN32 */

#include "gimpbasetypes.h"

#include "gimpdatafiles.h"
#include "gimpenv.h"


/**
 * SECTION: gimpdatafiles
 * @title: gimpdatafiles
 * @short_description: Functions to handle GIMP data files.
 *
 * Functions to handle GIMP data files.
 **/


static inline gboolean   is_script (const gchar *filename);
static inline gboolean   is_hidden (const gchar *filename);


/*  public functions  */

gboolean
gimp_datafiles_check_extension (const gchar *filename,
                                const gchar *extension)
{
  gint name_len;
  gint ext_len;

  g_return_val_if_fail (filename != NULL, FALSE);
  g_return_val_if_fail (extension != NULL, FALSE);

  name_len = strlen (filename);
  ext_len  = strlen (extension);

  if (! (name_len && ext_len && (name_len > ext_len)))
    return FALSE;

  return (g_ascii_strcasecmp (&filename[name_len - ext_len], extension) == 0);
}

void
gimp_datafiles_read_directories (const gchar            *path_str,
                                 GFileTest               flags,
                                 GimpDatafileLoaderFunc  loader_func,
                                 gpointer                user_data)
{
  gchar *local_path;
  GList *path;
  GList *list;

  g_return_if_fail (path_str != NULL);
  g_return_if_fail (loader_func != NULL);

  local_path = g_strdup (path_str);

  path = gimp_path_parse (local_path, 16, TRUE, NULL);

  for (list = path; list; list = g_list_next (list))
    {
      const gchar *dirname = list->data;
      GDir        *dir;

      dir = g_dir_open (dirname, 0, NULL);

      if (dir)
        {
          const gchar *dir_ent;

          while ((dir_ent = g_dir_read_name (dir)))
            {
              struct stat  filestat;
              gchar       *filename;

              if (is_hidden (dir_ent))
                continue;

              filename = g_build_filename (dirname, dir_ent, NULL);

              if (! g_stat (filename, &filestat))
                {
                  GimpDatafileData  file_data;

                  file_data.filename = filename;
                  file_data.dirname  = dirname;
                  file_data.basename = dir_ent;
                  file_data.atime    = filestat.st_atime;
                  file_data.mtime    = filestat.st_mtime;
                  file_data.ctime    = filestat.st_ctime;

                  if (flags & G_FILE_TEST_EXISTS)
                    {
                      (* loader_func) (&file_data, user_data);
                    }
                  else if ((flags & G_FILE_TEST_IS_REGULAR) &&
                           S_ISREG (filestat.st_mode))
                    {
                      (* loader_func) (&file_data, user_data);
                    }
                  else if ((flags & G_FILE_TEST_IS_DIR) &&
                           S_ISDIR (filestat.st_mode))
                    {
                      (* loader_func) (&file_data, user_data);
                    }
#ifndef G_OS_WIN32
                  else if ((flags & G_FILE_TEST_IS_SYMLINK) &&
                           S_ISLNK (filestat.st_mode))
                    {
                      (* loader_func) (&file_data, user_data);
                    }
#endif
                  else if ((flags & G_FILE_TEST_IS_EXECUTABLE) &&
                           (((filestat.st_mode & S_IXUSR) &&
                             !S_ISDIR (filestat.st_mode)) ||
                            (S_ISREG (filestat.st_mode) &&
                             is_script (filename))))
                    {
                      (* loader_func) (&file_data, user_data);
                    }
                }

              g_free (filename);
            }

          g_dir_close (dir);
        }
    }

  gimp_path_free (path);
  g_free (local_path);
}


/*  private functions  */

static inline gboolean
is_script (const gchar *filename)
{
#ifdef G_OS_WIN32
  /* On Windows there is no concept like the Unix executable flag.
   * There is a weak emulation provided by the MS C Runtime using file
   * extensions (com, exe, cmd, bat). This needs to be extended to treat
   * scripts (Python, Perl, ...) as executables, too. We use the PATHEXT
   * variable, which is also used by cmd.exe.
   */
  static gchar **exts = NULL;

  const gchar   *ext = strrchr (filename, '.');
  gchar         *pathext;
  gint           i;

  if (exts == NULL)
    {
      pathext = g_getenv ("PATHEXT");
      if (pathext != NULL)
        {
          exts = g_strsplit (pathext, G_SEARCHPATH_SEPARATOR_S, 100);
        }
      else
        {
          exts = g_new (gchar *, 1);
          exts[0] = NULL;
        }
    }

  i = 0;
  while (exts[i] != NULL)
    {
      if (g_ascii_strcasecmp (ext, exts[i]) == 0)
        return TRUE;
      i++;
    }
#endif /* G_OS_WIN32 */

  return FALSE;
}

static inline gboolean
is_hidden (const gchar *filename)
{
  /*  skip files starting with '.' so we don't try to parse
   *  stuff like .DS_Store or other metadata storage files
   */
  return (filename[0] == '.');
}