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diff --git a/libgimpmodule/gimpmoduledb.c b/libgimpmodule/gimpmoduledb.c
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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * 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
+ * <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gio/gio.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpconfig/gimpconfig.h"
+
+#include "gimpmoduletypes.h"
+
+#include "gimpmodule.h"
+#include "gimpmoduledb.h"
+
+
+/**
+ * SECTION: gimpmoduledb
+ * @title: GimpModuleDB
+ * @short_description: Keeps a list of #GimpModule's found in a given
+ * searchpath.
+ *
+ * Keeps a list of #GimpModule's found in a given searchpath.
+ **/
+
+
+enum
+{
+ ADD,
+ REMOVE,
+ MODULE_MODIFIED,
+ LAST_SIGNAL
+};
+
+
+#define DUMP_DB FALSE
+
+
+static void gimp_module_db_finalize (GObject *object);
+
+static void gimp_module_db_load_directory (GimpModuleDB *db,
+ GFile *directory);
+static void gimp_module_db_load_module (GimpModuleDB *db,
+ GFile *file);
+
+static GimpModule * gimp_module_db_module_find_by_path (GimpModuleDB *db,
+ const char *fullpath);
+
+static void gimp_module_db_module_dump_func (gpointer data,
+ gpointer user_data);
+static void gimp_module_db_module_on_disk_func (gpointer data,
+ gpointer user_data);
+static void gimp_module_db_module_remove_func (gpointer data,
+ gpointer user_data);
+
+static void gimp_module_db_module_modified (GimpModule *module,
+ GimpModuleDB *db);
+
+
+G_DEFINE_TYPE (GimpModuleDB, gimp_module_db, G_TYPE_OBJECT)
+
+#define parent_class gimp_module_db_parent_class
+
+static guint db_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_module_db_class_init (GimpModuleDBClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ db_signals[ADD] =
+ g_signal_new ("add",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpModuleDBClass, add),
+ NULL, NULL,
+ g_cclosure_marshal_VOID__OBJECT,
+ G_TYPE_NONE, 1,
+ GIMP_TYPE_MODULE);
+
+ db_signals[REMOVE] =
+ g_signal_new ("remove",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpModuleDBClass, remove),
+ NULL, NULL,
+ g_cclosure_marshal_VOID__OBJECT,
+ G_TYPE_NONE, 1,
+ GIMP_TYPE_MODULE);
+
+ db_signals[MODULE_MODIFIED] =
+ g_signal_new ("module-modified",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_FIRST,
+ G_STRUCT_OFFSET (GimpModuleDBClass, module_modified),
+ NULL, NULL,
+ g_cclosure_marshal_VOID__OBJECT,
+ G_TYPE_NONE, 1,
+ GIMP_TYPE_MODULE);
+
+ object_class->finalize = gimp_module_db_finalize;
+
+ klass->add = NULL;
+ klass->remove = NULL;
+}
+
+static void
+gimp_module_db_init (GimpModuleDB *db)
+{
+ db->modules = NULL;
+ db->load_inhibit = NULL;
+ db->verbose = FALSE;
+}
+
+static void
+gimp_module_db_finalize (GObject *object)
+{
+ GimpModuleDB *db = GIMP_MODULE_DB (object);
+
+ if (db->modules)
+ {
+ GList *list;
+
+ for (list = db->modules; list; list = g_list_next (list))
+ {
+ g_signal_handlers_disconnect_by_func (list->data,
+ gimp_module_db_module_modified,
+ db);
+ }
+
+ g_list_free (db->modules);
+ db->modules = NULL;
+ }
+
+ if (db->load_inhibit)
+ {
+ g_free (db->load_inhibit);
+ db->load_inhibit = NULL;
+ }
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+/**
+ * gimp_module_db_new:
+ * @verbose: Pass %TRUE to enable debugging output.
+ *
+ * Creates a new #GimpModuleDB instance. The @verbose parameter will be
+ * passed to the created #GimpModule instances using gimp_module_new().
+ *
+ * Return value: The new #GimpModuleDB instance.
+ **/
+GimpModuleDB *
+gimp_module_db_new (gboolean verbose)
+{
+ GimpModuleDB *db;
+
+ db = g_object_new (GIMP_TYPE_MODULE_DB, NULL);
+
+ db->verbose = verbose ? TRUE : FALSE;
+
+ return db;
+}
+
+static gboolean
+is_in_inhibit_list (const gchar *filename,
+ const gchar *inhibit_list)
+{
+ gchar *p;
+ gint pathlen;
+ const gchar *start;
+ const gchar *end;
+
+ if (! inhibit_list || ! strlen (inhibit_list))
+ return FALSE;
+
+ p = strstr (inhibit_list, filename);
+ if (!p)
+ return FALSE;
+
+ /* we have a substring, but check for colons either side */
+ start = p;
+ while (start != inhibit_list && *start != G_SEARCHPATH_SEPARATOR)
+ start--;
+
+ if (*start == G_SEARCHPATH_SEPARATOR)
+ start++;
+
+ end = strchr (p, G_SEARCHPATH_SEPARATOR);
+ if (! end)
+ end = inhibit_list + strlen (inhibit_list);
+
+ pathlen = strlen (filename);
+
+ if ((end - start) == pathlen)
+ return TRUE;
+
+ return FALSE;
+}
+
+/**
+ * gimp_module_db_set_load_inhibit:
+ * @db: A #GimpModuleDB.
+ * @load_inhibit: A #G_SEARCHPATH_SEPARATOR delimited list of module
+ * filenames to exclude from auto-loading.
+ *
+ * Sets the @load_inhibit flag for all #GimpModule's which are kept
+ * by @db (using gimp_module_set_load_inhibit()).
+ **/
+void
+gimp_module_db_set_load_inhibit (GimpModuleDB *db,
+ const gchar *load_inhibit)
+{
+ GList *list;
+
+ g_return_if_fail (GIMP_IS_MODULE_DB (db));
+
+ if (db->load_inhibit)
+ g_free (db->load_inhibit);
+
+ db->load_inhibit = g_strdup (load_inhibit);
+
+ for (list = db->modules; list; list = g_list_next (list))
+ {
+ GimpModule *module = list->data;
+
+ gimp_module_set_load_inhibit (module,
+ is_in_inhibit_list (module->filename,
+ load_inhibit));
+ }
+}
+
+/**
+ * gimp_module_db_get_load_inhibit:
+ * @db: A #GimpModuleDB.
+ *
+ * Return the #G_SEARCHPATH_SEPARATOR delimited list of module filenames
+ * which are excluded from auto-loading.
+ *
+ * Return value: the @db's @load_inhibit string.
+ **/
+const gchar *
+gimp_module_db_get_load_inhibit (GimpModuleDB *db)
+{
+ g_return_val_if_fail (GIMP_IS_MODULE_DB (db), NULL);
+
+ return db->load_inhibit;
+}
+
+/**
+ * gimp_module_db_load:
+ * @db: A #GimpModuleDB.
+ * @module_path: A #G_SEARCHPATH_SEPARATOR delimited list of directories
+ * to load modules from.
+ *
+ * Scans the directories contained in @module_path and creates a
+ * #GimpModule instance for every loadable module contained in the
+ * directories.
+ **/
+void
+gimp_module_db_load (GimpModuleDB *db,
+ const gchar *module_path)
+{
+ g_return_if_fail (GIMP_IS_MODULE_DB (db));
+ g_return_if_fail (module_path != NULL);
+
+ if (g_module_supported ())
+ {
+ GList *path;
+ GList *list;
+
+ path = gimp_config_path_expand_to_files (module_path, NULL);
+
+ for (list = path; list; list = g_list_next (list))
+ {
+ gimp_module_db_load_directory (db, list->data);
+ }
+
+ g_list_free_full (path, (GDestroyNotify) g_object_unref);
+ }
+
+ if (DUMP_DB)
+ g_list_foreach (db->modules, gimp_module_db_module_dump_func, NULL);
+}
+
+/**
+ * gimp_module_db_refresh:
+ * @db: A #GimpModuleDB.
+ * @module_path: A #G_SEARCHPATH_SEPARATOR delimited list of directories
+ * to load modules from.
+ *
+ * Does the same as gimp_module_db_load(), plus removes all #GimpModule
+ * instances whose modules have been deleted from disk.
+ *
+ * Note that the #GimpModule's will just be removed from the internal
+ * list and not freed as this is not possible with #GTypeModule
+ * instances which actually implement types.
+ **/
+void
+gimp_module_db_refresh (GimpModuleDB *db,
+ const gchar *module_path)
+{
+ GList *kill_list = NULL;
+
+ g_return_if_fail (GIMP_IS_MODULE_DB (db));
+ g_return_if_fail (module_path != NULL);
+
+ /* remove modules we don't have on disk anymore */
+ g_list_foreach (db->modules,
+ gimp_module_db_module_on_disk_func,
+ &kill_list);
+ g_list_foreach (kill_list,
+ gimp_module_db_module_remove_func,
+ db);
+ g_list_free (kill_list);
+
+ /* walk filesystem and add new things we find */
+ gimp_module_db_load (db, module_path);
+}
+
+static void
+gimp_module_db_load_directory (GimpModuleDB *db,
+ GFile *directory)
+{
+ GFileEnumerator *enumerator;
+
+ enumerator = g_file_enumerate_children (directory,
+ G_FILE_ATTRIBUTE_STANDARD_NAME ","
+ G_FILE_ATTRIBUTE_STANDARD_IS_HIDDEN ","
+ G_FILE_ATTRIBUTE_STANDARD_TYPE,
+ G_FILE_QUERY_INFO_NONE,
+ NULL, NULL);
+
+ if (enumerator)
+ {
+ GFileInfo *info;
+
+ while ((info = g_file_enumerator_next_file (enumerator, NULL, NULL)))
+ {
+ GFileType file_type = g_file_info_get_file_type (info);
+
+ if (file_type == G_FILE_TYPE_REGULAR &&
+ ! g_file_info_get_is_hidden (info))
+ {
+ GFile *child = g_file_enumerator_get_child (enumerator, info);
+
+ gimp_module_db_load_module (db, child);
+
+ g_object_unref (child);
+ }
+
+ g_object_unref (info);
+ }
+
+ g_object_unref (enumerator);
+ }
+}
+
+static void
+gimp_module_db_load_module (GimpModuleDB *db,
+ GFile *file)
+{
+ GimpModule *module;
+ gchar *path;
+ gboolean load_inhibit;
+
+ if (! gimp_file_has_extension (file, "." G_MODULE_SUFFIX))
+ return;
+
+ path = g_file_get_path (file);
+
+ /* don't load if we already know about it */
+ if (gimp_module_db_module_find_by_path (db, path))
+ {
+ g_free (path);
+ return;
+ }
+
+ load_inhibit = is_in_inhibit_list (path, db->load_inhibit);
+
+ module = gimp_module_new (path,
+ load_inhibit,
+ db->verbose);
+
+ g_free (path);
+
+ g_signal_connect (module, "modified",
+ G_CALLBACK (gimp_module_db_module_modified),
+ db);
+
+ db->modules = g_list_append (db->modules, module);
+
+ g_signal_emit (db, db_signals[ADD], 0, module);
+}
+
+static GimpModule *
+gimp_module_db_module_find_by_path (GimpModuleDB *db,
+ const char *fullpath)
+{
+ GList *list;
+
+ for (list = db->modules; list; list = g_list_next (list))
+ {
+ GimpModule *module = list->data;
+
+ if (! strcmp (module->filename, fullpath))
+ return module;
+ }
+
+ return NULL;
+}
+
+static void
+gimp_module_db_module_dump_func (gpointer data,
+ gpointer user_data)
+{
+ GimpModule *module = data;
+
+ g_print ("\n%s: %s\n",
+ gimp_filename_to_utf8 (module->filename),
+ gimp_module_state_name (module->state));
+
+ g_print (" module: %p lasterr: %s query: %p register: %p\n",
+ module->module,
+ module->last_module_error ? module->last_module_error : "NONE",
+ module->query_module,
+ module->register_module);
+
+ if (module->info)
+ {
+ g_print (" purpose: %s\n"
+ " author: %s\n"
+ " version: %s\n"
+ " copyright: %s\n"
+ " date: %s\n",
+ module->info->purpose ? module->info->purpose : "NONE",
+ module->info->author ? module->info->author : "NONE",
+ module->info->version ? module->info->version : "NONE",
+ module->info->copyright ? module->info->copyright : "NONE",
+ module->info->date ? module->info->date : "NONE");
+ }
+}
+
+static void
+gimp_module_db_module_on_disk_func (gpointer data,
+ gpointer user_data)
+{
+ GimpModule *module = data;
+ GList **kill_list = user_data;
+ gboolean old_on_disk;
+
+ old_on_disk = module->on_disk;
+
+ module->on_disk = g_file_test (module->filename, G_FILE_TEST_IS_REGULAR);
+
+ /* if it's not on the disk, and it isn't in memory, mark it to be
+ * removed later.
+ */
+ if (! module->on_disk && ! module->module)
+ {
+ *kill_list = g_list_append (*kill_list, module);
+ module = NULL;
+ }
+
+ if (module && module->on_disk != old_on_disk)
+ gimp_module_modified (module);
+}
+
+static void
+gimp_module_db_module_remove_func (gpointer data,
+ gpointer user_data)
+{
+ GimpModule *module = data;
+ GimpModuleDB *db = user_data;
+
+ g_signal_handlers_disconnect_by_func (module,
+ gimp_module_db_module_modified,
+ db);
+
+ db->modules = g_list_remove (db->modules, module);
+
+ g_signal_emit (db, db_signals[REMOVE], 0, module);
+}
+
+static void
+gimp_module_db_module_modified (GimpModule *module,
+ GimpModuleDB *db)
+{
+ g_signal_emit (db, db_signals[MODULE_MODIFIED], 0, module);
+}