Consolidate base utility libraries into libeutil.

Evolution consists of entirely too many small utility libraries, which
increases linking and loading time, places a burden on higher layers of
the application (e.g. modules) which has to remember to link to all the
small in-tree utility libraries, and makes it difficult to generate API
documentation for these utility libraries in one Gtk-Doc module.

Merge the following utility libraries under the umbrella of libeutil,
and enforce a single-include policy on libeutil so we can reorganize
the files as desired without disrupting its pseudo-public API.

   libemail-utils/libemail-utils.la
   libevolution-utils/libevolution-utils.la
   filter/libfilter.la
   widgets/e-timezone-dialog/libetimezonedialog.la
   widgets/menus/libmenus.la
   widgets/misc/libemiscwidgets.la
   widgets/table/libetable.la
   widgets/text/libetext.la

This also merges libedataserverui from the Evolution-Data-Server module,
since Evolution is its only consumer nowadays, and I'd like to make some
improvements to those APIs without concern for backward-compatibility.

And finally, start a Gtk-Doc module for libeutil.  It's going to be a
project just getting all the symbols _listed_ much less _documented_.
But the skeletal structure is in place and I'm off to a good start.

1 files changed, 1807 insertions, 0 deletions

diff --git a/e-util/e-misc-utils.c b/e-util/e-misc-utils.c
new file mode 100644
index 0000000000..7d1a0c6028
--- /dev/null
+++ b/e-util/e-misc-utils.c
@@ -0,0 +1,1807 @@
+/*
+ * This program 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 2 of the License, or (at your option) version 3.
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ *
+ * Authors:
+ *		Chris Lahey <clahey@ximian.com>
+ *
+ * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "e-misc-utils.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <math.h>
+#include <string.h>
+#include <locale.h>
+#include <time.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <gio/gio.h>
+#include <gtk/gtk.h>
+#include <glib/gi18n.h>
+#include <glib/gstdio.h>
+
+#ifdef G_OS_WIN32
+#include <windows.h>
+#endif
+
+#include <camel/camel.h>
+#include <libedataserver/libedataserver.h>
+
+#include "e-filter-option.h"
+#include "e-util-private.h"
+
+typedef struct _WindowData WindowData;
+
+struct _WindowData {
+	GtkWindow *window;
+	GSettings *settings;
+	ERestoreWindowFlags flags;
+	gint premax_width;
+	gint premax_height;
+	guint timeout_id;
+};
+
+static void
+window_data_free (WindowData *data)
+{
+	if (data->settings != NULL)
+		g_object_unref (data->settings);
+
+	if (data->timeout_id > 0)
+		g_source_remove (data->timeout_id);
+
+	g_slice_free (WindowData, data);
+}
+
+static gboolean
+window_update_settings (WindowData *data)
+{
+	GSettings *settings = data->settings;
+
+	if (data->flags & E_RESTORE_WINDOW_SIZE) {
+		GdkWindowState state;
+		GdkWindow *window;
+		gboolean maximized;
+
+		window = gtk_widget_get_window (GTK_WIDGET (data->window));
+		state = gdk_window_get_state (window);
+		maximized = ((state & GDK_WINDOW_STATE_MAXIMIZED) != 0);
+
+		g_settings_set_boolean (settings, "maximized", maximized);
+
+		if (!maximized) {
+			gint width, height;
+
+			gtk_window_get_size (data->window, &width, &height);
+
+			g_settings_set_int (settings, "width", width);
+			g_settings_set_int (settings, "height", height);
+		}
+	}
+
+	if (data->flags & E_RESTORE_WINDOW_POSITION) {
+		gint x, y;
+
+		gtk_window_get_position (data->window, &x, &y);
+
+		g_settings_set_int (settings, "x", x);
+		g_settings_set_int (settings, "y", y);
+	}
+
+	data->timeout_id = 0;
+
+	return FALSE;
+}
+
+static void
+window_delayed_update_settings (WindowData *data)
+{
+	if (data->timeout_id > 0)
+		g_source_remove (data->timeout_id);
+
+	data->timeout_id = g_timeout_add_seconds (
+		1, (GSourceFunc) window_update_settings, data);
+}
+
+static gboolean
+window_configure_event_cb (GtkWindow *window,
+                           GdkEventConfigure *event,
+                           WindowData *data)
+{
+	window_delayed_update_settings (data);
+
+	return FALSE;
+}
+
+static gboolean
+window_state_event_cb (GtkWindow *window,
+                       GdkEventWindowState *event,
+                       WindowData *data)
+{
+	gboolean window_was_unmaximized;
+
+	if (data->timeout_id > 0)
+		g_source_remove (data->timeout_id);
+
+	window_was_unmaximized =
+		((event->changed_mask & GDK_WINDOW_STATE_MAXIMIZED) != 0) &&
+		((event->new_window_state & GDK_WINDOW_STATE_MAXIMIZED) == 0);
+
+	if (window_was_unmaximized) {
+		gint width, height;
+
+		width = data->premax_width;
+		data->premax_width = 0;
+
+		height = data->premax_height;
+		data->premax_height = 0;
+
+		/* This only applies when the window is initially restored
+		 * as maximized and is then unmaximized.  GTK+ handles the
+		 * unmaximized window size thereafter. */
+		if (width > 0 && height > 0)
+			gtk_window_resize (window, width, height);
+	}
+
+	window_delayed_update_settings (data);
+
+	return FALSE;
+}
+
+static gboolean
+window_unmap_cb (GtkWindow *window,
+                 WindowData *data)
+{
+	if (data->timeout_id > 0)
+		g_source_remove (data->timeout_id);
+
+	/* It's too late to record the window position.
+	 * gtk_window_get_position() will report (0, 0). */
+	data->flags &= ~E_RESTORE_WINDOW_POSITION;
+
+	window_update_settings (data);
+
+	return FALSE;
+}
+
+/**
+ * e_get_accels_filename:
+ *
+ * Returns the name of the user data file containing custom keyboard
+ * accelerator specifications.
+ *
+ * Returns: filename for accelerator specifications
+ **/
+const gchar *
+e_get_accels_filename (void)
+{
+	static gchar *filename = NULL;
+
+	if (G_UNLIKELY (filename == NULL)) {
+		const gchar *config_dir = e_get_user_config_dir ();
+		filename = g_build_filename (config_dir, "accels", NULL);
+	}
+
+	return filename;
+}
+
+/**
+ * e_show_uri:
+ * @parent: a parent #GtkWindow or %NULL
+ * @uri: the URI to show
+ *
+ * Launches the default application to show the given URI.  The URI must
+ * be of a form understood by GIO.  If the URI cannot be shown, it presents
+ * a dialog describing the error.  The dialog is set as transient to @parent
+ * if @parent is non-%NULL.
+ **/
+void
+e_show_uri (GtkWindow *parent,
+            const gchar *uri)
+{
+	GtkWidget *dialog;
+	GdkScreen *screen = NULL;
+	GError *error = NULL;
+	guint32 timestamp;
+
+	g_return_if_fail (uri != NULL);
+
+	timestamp = gtk_get_current_event_time ();
+
+	if (parent != NULL)
+		screen = gtk_widget_get_screen (GTK_WIDGET (parent));
+
+	if (gtk_show_uri (screen, uri, timestamp, &error))
+		return;
+
+	dialog = gtk_message_dialog_new_with_markup (
+		parent, GTK_DIALOG_DESTROY_WITH_PARENT,
+		GTK_MESSAGE_ERROR, GTK_BUTTONS_OK,
+		"<big><b>%s</b></big>",
+		_("Could not open the link."));
+
+	gtk_message_dialog_format_secondary_text (
+		GTK_MESSAGE_DIALOG (dialog), "%s", error->message);
+
+	gtk_dialog_run (GTK_DIALOG (dialog));
+
+	gtk_widget_destroy (dialog);
+	g_error_free (error);
+}
+
+/**
+ * e_display_help:
+ * @parent: a parent #GtkWindow or %NULL
+ * @link_id: help section to present or %NULL
+ *
+ * Opens the user documentation to the section given by @link_id, or to the
+ * table of contents if @link_id is %NULL.  If the user documentation cannot
+ * be opened, it presents a dialog describing the error.  The dialog is set
+ * as transient to @parent if @parent is non-%NULL.
+ **/
+void
+e_display_help (GtkWindow *parent,
+                const gchar *link_id)
+{
+	GString *uri;
+	GtkWidget *dialog;
+	GdkScreen *screen = NULL;
+	GError *error = NULL;
+	guint32 timestamp;
+
+	uri = g_string_new ("help:" PACKAGE);
+	timestamp = gtk_get_current_event_time ();
+
+	if (parent != NULL)
+		screen = gtk_widget_get_screen (GTK_WIDGET (parent));
+
+	if (link_id != NULL)
+		g_string_append_printf (uri, "?%s", link_id);
+
+	if (gtk_show_uri (screen, uri->str, timestamp, &error))
+		goto exit;
+
+	dialog = gtk_message_dialog_new_with_markup (
+		parent, GTK_DIALOG_DESTROY_WITH_PARENT,
+		GTK_MESSAGE_ERROR, GTK_BUTTONS_OK,
+		"<big><b>%s</b></big>",
+		_("Could not display help for Evolution."));
+
+	gtk_message_dialog_format_secondary_text (
+		GTK_MESSAGE_DIALOG (dialog), "%s", error->message);
+
+	gtk_dialog_run (GTK_DIALOG (dialog));
+
+	gtk_widget_destroy (dialog);
+	g_error_free (error);
+
+exit:
+	g_string_free (uri, TRUE);
+}
+
+/**
+ * e_restore_window:
+ * @window: a #GtkWindow
+ * @settings_path: a #GSettings path
+ * @flags: flags indicating which window features to restore
+ *
+ * This function can restore one of or both a window's size and position
+ * using #GSettings keys at @settings_path which conform to the relocatable
+ * schema "org.gnome.evolution.window".
+ *
+ * If #E_RESTORE_WINDOW_SIZE is present in @flags, restore @window's
+ * previously recorded size and maximize state.
+ *
+ * If #E_RESTORE_WINDOW_POSITION is present in @flags, move @window to
+ * the previously recorded screen coordinates.
+ *
+ * The respective #GSettings values will be updated when the window is
+ * resized and/or moved.
+ **/
+void
+e_restore_window (GtkWindow *window,
+                  const gchar *settings_path,
+                  ERestoreWindowFlags flags)
+{
+	WindowData *data;
+	GSettings *settings;
+	const gchar *schema;
+
+	g_return_if_fail (GTK_IS_WINDOW (window));
+	g_return_if_fail (settings_path != NULL);
+
+	schema = "org.gnome.evolution.window";
+	settings = g_settings_new_with_path (schema, settings_path);
+
+	data = g_slice_new0 (WindowData);
+	data->window = window;
+	data->settings = g_object_ref (settings);
+	data->flags = flags;
+
+	if (flags & E_RESTORE_WINDOW_SIZE) {
+		gint width, height;
+
+		width = g_settings_get_int (settings, "width");
+		height = g_settings_get_int (settings, "height");
+
+		if (width > 0 && height > 0)
+			gtk_window_resize (window, width, height);
+
+		if (g_settings_get_boolean (settings, "maximized")) {
+			GdkScreen *screen;
+			GdkRectangle monitor_area;
+			gint x, y, monitor;
+
+			x = g_settings_get_int (settings, "x");
+			y = g_settings_get_int (settings, "y");
+
+			screen = gtk_window_get_screen (window);
+			gtk_window_get_size (window, &width, &height);
+
+			data->premax_width = width;
+			data->premax_height = height;
+
+			monitor = gdk_screen_get_monitor_at_point (screen, x, y);
+			if (monitor < 0 || monitor >= gdk_screen_get_n_monitors (screen))
+				monitor = 0;
+
+			gdk_screen_get_monitor_workarea (screen, monitor, &monitor_area);
+
+			gtk_window_resize (window, monitor_area.width, monitor_area.height);
+			gtk_window_maximize (window);
+		}
+	}
+
+	if (flags & E_RESTORE_WINDOW_POSITION) {
+		gint x, y;
+
+		x = g_settings_get_int (settings, "x");
+		y = g_settings_get_int (settings, "y");
+
+		gtk_window_move (window, x, y);
+	}
+
+	g_object_set_data_full (
+		G_OBJECT (window),
+		"e-util-window-data", data,
+		(GDestroyNotify) window_data_free);
+
+	g_signal_connect (
+		window, "configure-event",
+		G_CALLBACK (window_configure_event_cb), data);
+
+	g_signal_connect (
+		window, "window-state-event",
+		G_CALLBACK (window_state_event_cb), data);
+
+	g_signal_connect (
+		window, "unmap",
+		G_CALLBACK (window_unmap_cb), data);
+
+	g_object_unref (settings);
+}
+
+/**
+ * e_lookup_action:
+ * @ui_manager: a #GtkUIManager
+ * @action_name: the name of an action
+ *
+ * Returns the first #GtkAction named @action_name by traversing the
+ * list of action groups in @ui_manager.  If no such action exists, the
+ * function emits a critical warning before returning %NULL, since this
+ * probably indicates a programming error and most code is not prepared
+ * to deal with lookup failures.
+ *
+ * Returns: the first #GtkAction named @action_name
+ **/
+GtkAction *
+e_lookup_action (GtkUIManager *ui_manager,
+                 const gchar *action_name)
+{
+	GtkAction *action = NULL;
+	GList *iter;
+
+	g_return_val_if_fail (GTK_IS_UI_MANAGER (ui_manager), NULL);
+	g_return_val_if_fail (action_name != NULL, NULL);
+
+	iter = gtk_ui_manager_get_action_groups (ui_manager);
+
+	while (iter != NULL) {
+		GtkActionGroup *action_group = iter->data;
+
+		action = gtk_action_group_get_action (
+			action_group, action_name);
+		if (action != NULL)
+			return action;
+
+		iter = g_list_next (iter);
+	}
+
+	g_critical ("%s: action '%s' not found", G_STRFUNC, action_name);
+
+	return NULL;
+}
+
+/**
+ * e_lookup_action_group:
+ * @ui_manager: a #GtkUIManager
+ * @group_name: the name of an action group
+ *
+ * Returns the #GtkActionGroup in @ui_manager named @group_name.  If no
+ * such action group exists, the function emits a critical warnings before
+ * returning %NULL, since this probably indicates a programming error and
+ * most code is not prepared to deal with lookup failures.
+ *
+ * Returns: the #GtkActionGroup named @group_name
+ **/
+GtkActionGroup *
+e_lookup_action_group (GtkUIManager *ui_manager,
+                       const gchar *group_name)
+{
+	GList *iter;
+
+	g_return_val_if_fail (GTK_IS_UI_MANAGER (ui_manager), NULL);
+	g_return_val_if_fail (group_name != NULL, NULL);
+
+	iter = gtk_ui_manager_get_action_groups (ui_manager);
+
+	while (iter != NULL) {
+		GtkActionGroup *action_group = iter->data;
+		const gchar *name;
+
+		name = gtk_action_group_get_name (action_group);
+		if (strcmp (name, group_name) == 0)
+			return action_group;
+
+		iter = g_list_next (iter);
+	}
+
+	g_critical ("%s: action group '%s' not found", G_STRFUNC, group_name);
+
+	return NULL;
+}
+
+/**
+ * e_action_compare_by_label:
+ * @action1: a #GtkAction
+ * @action2: a #GtkAction
+ *
+ * Compares the labels for @action1 and @action2 using g_utf8_collate().
+ *
+ * Returns: &lt; 0 if @action1 compares before @action2, 0 if they
+ *          compare equal, &gt; 0 if @action1 compares after @action2
+ **/
+gint
+e_action_compare_by_label (GtkAction *action1,
+                           GtkAction *action2)
+{
+	gchar *label1;
+	gchar *label2;
+	gint result;
+
+	/* XXX This is horribly inefficient but will generally only be
+	 *     used on short lists of actions during UI construction. */
+
+	if (action1 == action2)
+		return 0;
+
+	g_object_get (action1, "label", &label1, NULL);
+	g_object_get (action2, "label", &label2, NULL);
+
+	result = g_utf8_collate (label1, label2);
+
+	g_free (label1);
+	g_free (label2);
+
+	return result;
+}
+
+/**
+ * e_action_group_remove_all_actions:
+ * @action_group: a #GtkActionGroup
+ *
+ * Removes all actions from the action group.
+ **/
+void
+e_action_group_remove_all_actions (GtkActionGroup *action_group)
+{
+	GList *list, *iter;
+
+	/* XXX I've proposed this function for inclusion in GTK+.
+	 *     GtkActionGroup stores actions in an internal hash
+	 *     table and can do this more efficiently by calling
+	 *     g_hash_table_remove_all().
+	 *
+	 *     http://bugzilla.gnome.org/show_bug.cgi?id=550485 */
+
+	g_return_if_fail (GTK_IS_ACTION_GROUP (action_group));
+
+	list = gtk_action_group_list_actions (action_group);
+	for (iter = list; iter != NULL; iter = iter->next)
+		gtk_action_group_remove_action (action_group, iter->data);
+	g_list_free (list);
+}
+
+/**
+ * e_radio_action_get_current_action:
+ * @radio_action: a #GtkRadioAction
+ *
+ * Returns the currently active member of the group to which @radio_action
+ * belongs.
+ *
+ * Returns: the currently active group member
+ **/
+GtkRadioAction *
+e_radio_action_get_current_action (GtkRadioAction *radio_action)
+{
+	GSList *group;
+	gint current_value;
+
+	g_return_val_if_fail (GTK_IS_RADIO_ACTION (radio_action), NULL);
+
+	group = gtk_radio_action_get_group (radio_action);
+	current_value = gtk_radio_action_get_current_value (radio_action);
+
+	while (group != NULL) {
+		gint value;
+
+		radio_action = GTK_RADIO_ACTION (group->data);
+		g_object_get (radio_action, "value", &value, NULL);
+
+		if (value == current_value)
+			return radio_action;
+
+		group = g_slist_next (group);
+	}
+
+	return NULL;
+}
+
+/**
+ * e_action_group_add_actions_localized:
+ * @action_group: a #GtkActionGroup to add @entries to
+ * @translation_domain: a translation domain to use
+ *    to translate label and tooltip strings in @entries
+ * @entries: (array length=n_entries): an array of action descriptions
+ * @n_entries: the number of entries
+ * @user_data: data to pass to the action callbacks
+ *
+ * Adds #GtkAction-s defined by @entries to @action_group, with action's
+ * label and tooltip localized in the given translation domain, instead
+ * of the domain set on the @action_group.
+ *
+ * Since: 3.4
+ **/
+void
+e_action_group_add_actions_localized (GtkActionGroup *action_group,
+                                      const gchar *translation_domain,
+                                      const GtkActionEntry *entries,
+                                      guint n_entries,
+                                      gpointer user_data)
+{
+	GtkActionGroup *tmp_group;
+	GList *list, *iter;
+	gint ii;
+
+	g_return_if_fail (action_group != NULL);
+	g_return_if_fail (entries != NULL);
+	g_return_if_fail (n_entries > 0);
+	g_return_if_fail (translation_domain != NULL);
+	g_return_if_fail (*translation_domain);
+
+	tmp_group = gtk_action_group_new ("temporary-group");
+	gtk_action_group_set_translation_domain (tmp_group, translation_domain);
+	gtk_action_group_add_actions (tmp_group, entries, n_entries, user_data);
+
+	list = gtk_action_group_list_actions (tmp_group);
+	for (iter = list; iter != NULL; iter = iter->next) {
+		GtkAction *action = GTK_ACTION (iter->data);
+		const gchar *action_name;
+
+		g_object_ref (action);
+
+		action_name = gtk_action_get_name (action);
+
+		for (ii = 0; ii < n_entries; ii++) {
+			if (g_strcmp0 (entries[ii].name, action_name) == 0) {
+				gtk_action_group_remove_action (
+					tmp_group, action);
+				gtk_action_group_add_action_with_accel (
+					action_group, action,
+					entries[ii].accelerator);
+				break;
+			}
+		}
+
+		g_object_unref (action);
+	}
+
+	g_list_free (list);
+	g_object_unref (tmp_group);
+}
+
+/**
+ * e_builder_get_widget:
+ * @builder: a #GtkBuilder
+ * @widget_name: name of a widget in @builder
+ *
+ * Gets the widget named @widget_name.  Note that this function does not
+ * increment the reference count of the returned widget.  If @widget_name
+ * could not be found in the @builder<!-- -->'s object tree, a run-time
+ * warning is emitted since this usually indicates a programming error.
+ *
+ * This is a convenience function to work around the awkwardness of
+ * #GtkBuilder returning #GObject pointers, when the vast majority of
+ * the time you want a #GtkWidget pointer.
+ *
+ * If you need something from @builder other than a #GtkWidget, or you
+ * want to test for the existence of some widget name without incurring
+ * a run-time warning, use gtk_builder_get_object().
+ *
+ * Returns: the widget named @widget_name, or %NULL
+ **/
+GtkWidget *
+e_builder_get_widget (GtkBuilder *builder,
+                      const gchar *widget_name)
+{
+	GObject *object;
+
+	g_return_val_if_fail (GTK_IS_BUILDER (builder), NULL);
+	g_return_val_if_fail (widget_name != NULL, NULL);
+
+	object = gtk_builder_get_object (builder, widget_name);
+	if (object == NULL) {
+		g_warning ("Could not find widget '%s'", widget_name);
+		return NULL;
+	}
+
+	return GTK_WIDGET (object);
+}
+
+/**
+ * e_load_ui_builder_definition:
+ * @builder: a #GtkBuilder
+ * @basename: basename of the UI definition file
+ *
+ * Loads a UI definition into @builder from Evolution's UI directory.
+ * Failure here is fatal, since the application can't function without
+ * its UI definitions.
+ **/
+void
+e_load_ui_builder_definition (GtkBuilder *builder,
+                              const gchar *basename)
+{
+	gchar *filename;
+	GError *error = NULL;
+
+	g_return_if_fail (GTK_IS_BUILDER (builder));
+	g_return_if_fail (basename != NULL);
+
+	filename = g_build_filename (EVOLUTION_UIDIR, basename, NULL);
+	gtk_builder_add_from_file (builder, filename, &error);
+	g_free (filename);
+
+	if (error != NULL) {
+		g_error ("%s: %s", basename, error->message);
+		g_assert_not_reached ();
+	}
+}
+
+/* Helper for e_categories_add_change_hook() */
+static void
+categories_changed_cb (GObject *useless_opaque_object,
+                       GHookList *hook_list)
+{
+	/* e_categories_register_change_listener() is broken because
+	 * it requires callbacks to allow for some opaque GObject as
+	 * the first argument (not does it document this). */
+	g_hook_list_invoke (hook_list, FALSE);
+}
+
+/* Helper for e_categories_add_change_hook() */
+static void
+categories_weak_notify_cb (GHookList *hook_list,
+                           gpointer where_the_object_was)
+{
+	GHook *hook;
+
+	/* This should not happen, but if we fail to find the hook for
+	 * some reason, g_hook_destroy_link() will warn about the NULL
+	 * pointer, which is all we would do anyway so no need to test
+	 * for it ourselves. */
+	hook = g_hook_find_data (hook_list, TRUE, where_the_object_was);
+	g_hook_destroy_link (hook_list, hook);
+}
+
+/**
+ * e_categories_add_change_hook:
+ * @func: a hook function
+ * @object: a #GObject to be passed to @func, or %NULL
+ *
+ * A saner alternative to e_categories_register_change_listener().
+ *
+ * Adds a hook function to be called when a category is added, removed or
+ * modified.  If @object is not %NULL, the hook function is automatically
+ * removed when @object is finalized.
+ **/
+void
+e_categories_add_change_hook (GHookFunc func,
+                              gpointer object)
+{
+	static gboolean initialized = FALSE;
+	static GHookList hook_list;
+	GHook *hook;
+
+	g_return_if_fail (func != NULL);
+
+	if (object != NULL)
+		g_return_if_fail (G_IS_OBJECT (object));
+
+	if (!initialized) {
+		g_hook_list_init (&hook_list, sizeof (GHook));
+		e_categories_register_change_listener (
+			G_CALLBACK (categories_changed_cb), &hook_list);
+		initialized = TRUE;
+	}
+
+	hook = g_hook_alloc (&hook_list);
+
+	hook->func = func;
+	hook->data = object;
+
+	if (object != NULL)
+		g_object_weak_ref (
+			G_OBJECT (object), (GWeakNotify)
+			categories_weak_notify_cb, &hook_list);
+
+	g_hook_append (&hook_list, hook);
+}
+
+/**
+ * e_flexible_strtod:
+ * @nptr:    the string to convert to a numeric value.
+ * @endptr:  if non-NULL, it returns the character after
+ *           the last character used in the conversion.
+ *
+ * Converts a string to a gdouble value.  This function detects
+ * strings either in the standard C locale or in the current locale.
+ *
+ * This function is typically used when reading configuration files or
+ * other non-user input that should not be locale dependent, but may
+ * have been in the past.  To handle input from the user you should
+ * normally use the locale-sensitive system strtod function.
+ *
+ * To convert from a double to a string in a locale-insensitive way, use
+ * @g_ascii_dtostr.
+ *
+ * Returns: the gdouble value
+ **/
+gdouble
+e_flexible_strtod (const gchar *nptr,
+                   gchar **endptr)
+{
+	gchar *fail_pos;
+	gdouble val;
+	struct lconv *locale_data;
+	const gchar *decimal_point;
+	gint decimal_point_len;
+	const gchar *p, *decimal_point_pos;
+	const gchar *end = NULL; /* Silence gcc */
+	gchar *copy, *c;
+
+	g_return_val_if_fail (nptr != NULL, 0);
+
+	fail_pos = NULL;
+
+	locale_data = localeconv ();
+	decimal_point = locale_data->decimal_point;
+	decimal_point_len = strlen (decimal_point);
+
+	g_return_val_if_fail (decimal_point_len != 0, 0);
+
+	decimal_point_pos = NULL;
+	if (!strcmp (decimal_point, "."))
+		return strtod (nptr, endptr);
+
+	p = nptr;
+
+	/* Skip leading space */
+	while (isspace ((guchar) * p))
+		p++;
+
+	/* Skip leading optional sign */
+	if (*p == '+' || *p == '-')
+		p++;
+
+	if (p[0] == '0' &&
+	    (p[1] == 'x' || p[1] == 'X')) {
+		p += 2;
+		/* HEX - find the (optional) decimal point */
+
+		while (isxdigit ((guchar) * p))
+			p++;
+
+		if (*p == '.') {
+			decimal_point_pos = p++;
+
+			while (isxdigit ((guchar) * p))
+				p++;
+
+			if (*p == 'p' || *p == 'P')
+				p++;
+			if (*p == '+' || *p == '-')
+				p++;
+			while (isdigit ((guchar) * p))
+				p++;
+			end = p;
+		} else if (strncmp (p, decimal_point, decimal_point_len) == 0) {
+			return strtod (nptr, endptr);
+		}
+	} else {
+		while (isdigit ((guchar) * p))
+			p++;
+
+		if (*p == '.') {
+			decimal_point_pos = p++;
+
+			while (isdigit ((guchar) * p))
+				p++;
+
+			if (*p == 'e' || *p == 'E')
+				p++;
+			if (*p == '+' || *p == '-')
+				p++;
+			while (isdigit ((guchar) * p))
+				p++;
+			end = p;
+		} else if (strncmp (p, decimal_point, decimal_point_len) == 0) {
+			return strtod (nptr, endptr);
+		}
+	}
+	/* For the other cases, we need not convert the decimal point */
+
+	if (!decimal_point_pos)
+		return strtod (nptr, endptr);
+
+	/* We need to convert the '.' to the locale specific decimal point */
+	copy = g_malloc (end - nptr + 1 + decimal_point_len);
+
+	c = copy;
+	memcpy (c, nptr, decimal_point_pos - nptr);
+	c += decimal_point_pos - nptr;
+	memcpy (c, decimal_point, decimal_point_len);
+	c += decimal_point_len;
+	memcpy (c, decimal_point_pos + 1, end - (decimal_point_pos + 1));
+	c += end - (decimal_point_pos + 1);
+	*c = 0;
+
+	val = strtod (copy, &fail_pos);
+
+	if (fail_pos) {
+		if (fail_pos > decimal_point_pos)
+			fail_pos =
+				(gchar *) nptr + (fail_pos - copy) -
+				(decimal_point_len - 1);
+		else
+			fail_pos = (gchar *) nptr + (fail_pos - copy);
+	}
+
+	g_free (copy);
+
+	if (endptr)
+		*endptr = fail_pos;
+
+	return val;
+}
+
+/**
+ * e_ascii_dtostr:
+ * @buffer: A buffer to place the resulting string in
+ * @buf_len: The length of the buffer.
+ * @format: The printf-style format to use for the
+ *          code to use for converting.
+ * @d: The double to convert
+ *
+ * Converts a double to a string, using the '.' as
+ * decimal_point. To format the number you pass in
+ * a printf-style formating string. Allowed conversion
+ * specifiers are eEfFgG.
+ *
+ * If you want to generates enough precision that converting
+ * the string back using @g_strtod gives the same machine-number
+ * (on machines with IEEE compatible 64bit doubles) use the format
+ * string "%.17g". If you do this it is guaranteed that the size
+ * of the resulting string will never be larger than
+ * @G_ASCII_DTOSTR_BUF_SIZE bytes.
+ *
+ * Returns: the pointer to the buffer with the converted string
+ **/
+gchar *
+e_ascii_dtostr (gchar *buffer,
+                gint buf_len,
+                const gchar *format,
+                gdouble d)
+{
+	struct lconv *locale_data;
+	const gchar *decimal_point;
+	gint decimal_point_len;
+	gchar *p;
+	gint rest_len;
+	gchar format_char;
+
+	g_return_val_if_fail (buffer != NULL, NULL);
+	g_return_val_if_fail (format[0] == '%', NULL);
+	g_return_val_if_fail (strpbrk (format + 1, "'l%") == NULL, NULL);
+
+	format_char = format[strlen (format) - 1];
+
+	g_return_val_if_fail (format_char == 'e' || format_char == 'E' ||
+			      format_char == 'f' || format_char == 'F' ||
+			      format_char == 'g' || format_char == 'G',
+			      NULL);
+
+	if (format[0] != '%')
+		return NULL;
+
+	if (strpbrk (format + 1, "'l%"))
+		return NULL;
+
+	if (!(format_char == 'e' || format_char == 'E' ||
+	      format_char == 'f' || format_char == 'F' ||
+	      format_char == 'g' || format_char == 'G'))
+		return NULL;
+
+	g_snprintf (buffer, buf_len, format, d);
+
+	locale_data = localeconv ();
+	decimal_point = locale_data->decimal_point;
+	decimal_point_len = strlen (decimal_point);
+
+	g_return_val_if_fail (decimal_point_len != 0, NULL);
+
+	if (strcmp (decimal_point, ".")) {
+		p = buffer;
+
+		if (*p == '+' || *p == '-')
+			p++;
+
+		while (isdigit ((guchar) * p))
+			p++;
+
+		if (strncmp (p, decimal_point, decimal_point_len) == 0) {
+			*p = '.';
+			p++;
+			if (decimal_point_len > 1) {
+				rest_len = strlen (p + (decimal_point_len - 1));
+				memmove (
+					p, p + (decimal_point_len - 1),
+					rest_len);
+				p[rest_len] = 0;
+			}
+		}
+	}
+
+	return buffer;
+}
+
+/**
+ * e_str_without_underscores:
+ * @string: the string to strip underscores from
+ *
+ * Strips underscores from a string in the same way
+ * @gtk_label_new_with_mnemonics does.  The returned string should be freed
+ * using g_free().
+ *
+ * Returns: a newly-allocated string without underscores
+ */
+gchar *
+e_str_without_underscores (const gchar *string)
+{
+	gchar *new_string;
+	const gchar *sp;
+	gchar *dp;
+
+	new_string = g_malloc (strlen (string) + 1);
+
+	dp = new_string;
+	for (sp = string; *sp != '\0'; sp++) {
+		if (*sp != '_') {
+			*dp = *sp;
+			dp++;
+		} else if (sp[1] == '_') {
+			/* Translate "__" in "_".  */
+			*dp = '_';
+			dp++;
+			sp++;
+		}
+	}
+	*dp = 0;
+
+	return new_string;
+}
+
+gint
+e_str_compare (gconstpointer x,
+               gconstpointer y)
+{
+	if (x == NULL || y == NULL) {
+		if (x == y)
+			return 0;
+		else
+			return x ? -1 : 1;
+	}
+
+	return strcmp (x, y);
+}
+
+gint
+e_str_case_compare (gconstpointer x,
+                    gconstpointer y)
+{
+	gchar *cx, *cy;
+	gint res;
+
+	if (x == NULL || y == NULL) {
+		if (x == y)
+			return 0;
+		else
+			return x ? -1 : 1;
+	}
+
+	cx = g_utf8_casefold (x, -1);
+	cy = g_utf8_casefold (y, -1);
+
+	res = g_utf8_collate (cx, cy);
+
+	g_free (cx);
+	g_free (cy);
+
+	return res;
+}
+
+gint
+e_collate_compare (gconstpointer x,
+                   gconstpointer y)
+{
+	if (x == NULL || y == NULL) {
+		if (x == y)
+			return 0;
+		else
+			return x ? -1 : 1;
+	}
+
+	return g_utf8_collate (x, y);
+}
+
+gint
+e_int_compare (gconstpointer x,
+               gconstpointer y)
+{
+	gint nx = GPOINTER_TO_INT (x);
+	gint ny = GPOINTER_TO_INT (y);
+
+	return (nx == ny) ? 0 : (nx < ny) ? -1 : 1;
+}
+
+/**
+ * e_color_to_value:
+ * @color: a #GdkColor
+ *
+ * Converts a #GdkColor to a 24-bit RGB color value.
+ *
+ * Returns: a 24-bit color value
+ **/
+guint32
+e_color_to_value (GdkColor *color)
+{
+	GdkRGBA rgba;
+
+	g_return_val_if_fail (color != NULL, 0);
+
+	rgba.red = color->red / 65535.0;
+	rgba.green = color->green / 65535.0;
+	rgba.blue = color->blue / 65535.0;
+	rgba.alpha = 0.0;
+
+	return e_rgba_to_value (&rgba);
+}
+
+/**
+ * e_rgba_to_value:
+ * @rgba: a #GdkRGBA
+ *
+ *
+ * Converts #GdkRGBA to a 24-bit RGB color value
+ *
+ * Returns: a 24-bit color value
+ **/
+guint32
+e_rgba_to_value (GdkRGBA *rgba)
+{
+	guint16 red;
+	guint16 green;
+	guint16 blue;
+
+	g_return_val_if_fail (rgba != NULL, 0);
+
+	red = 255 * rgba->red;
+	green = 255 * rgba->green;
+	blue = 255 * rgba->blue;
+
+	return (guint32)
+		((((red & 0xFF) << 16) |
+		((green & 0xFF) << 8) |
+		(blue & 0xFF)) & 0xffffff);
+}
+
+static gint
+epow10 (gint number)
+{
+	gint value = 1;
+
+	while (number-- > 0)
+		value *= 10;
+
+	return value;
+}
+
+gchar *
+e_format_number (gint number)
+{
+	GList *iterator, *list = NULL;
+	struct lconv *locality;
+	gint char_length = 0;
+	gint group_count = 0;
+	gchar *grouping;
+	gint last_count = 3;
+	gint divider;
+	gchar *value;
+	gchar *value_iterator;
+
+	locality = localeconv ();
+	grouping = locality->grouping;
+	while (number) {
+		gchar *group;
+		switch (*grouping) {
+		default:
+			last_count = *grouping;
+			grouping++;
+		case 0:
+			divider = epow10 (last_count);
+			if (number >= divider) {
+				group = g_strdup_printf (
+					"%0*d", last_count, number % divider);
+			} else {
+				group = g_strdup_printf (
+					"%d", number % divider);
+			}
+			number /= divider;
+			break;
+		case CHAR_MAX:
+			group = g_strdup_printf ("%d", number);
+			number = 0;
+			break;
+		}
+		char_length += strlen (group);
+		list = g_list_prepend (list, group);
+		group_count++;
+	}
+
+	if (list) {
+		value = g_new (
+			gchar, 1 + char_length + (group_count - 1) *
+			strlen (locality->thousands_sep));
+
+		iterator = list;
+		value_iterator = value;
+
+		strcpy (value_iterator, iterator->data);
+		value_iterator += strlen (iterator->data);
+		for (iterator = iterator->next; iterator; iterator = iterator->next) {
+			strcpy (value_iterator, locality->thousands_sep);
+			value_iterator += strlen (locality->thousands_sep);
+
+			strcpy (value_iterator, iterator->data);
+			value_iterator += strlen (iterator->data);
+		}
+		g_list_foreach (list, (GFunc) g_free, NULL);
+		g_list_free (list);
+		return value;
+	} else {
+		return g_strdup ("0");
+	}
+}
+
+/* Perform a binary search for key in base which has nmemb elements
+ * of size bytes each.  The comparisons are done by (*compare)().  */
+void
+e_bsearch (gconstpointer key,
+           gconstpointer base,
+           gsize nmemb,
+           gsize size,
+           ESortCompareFunc compare,
+           gpointer closure,
+           gsize *start,
+           gsize *end)
+{
+	gsize l, u, idx;
+	gconstpointer p;
+	gint comparison;
+	if (!(start || end))
+		return;
+
+	l = 0;
+	u = nmemb;
+	while (l < u) {
+		idx = (l + u) / 2;
+		p = (((const gchar *) base) + (idx * size));
+		comparison = (*compare) (key, p, closure);
+		if (comparison < 0)
+			u = idx;
+		else if (comparison > 0)
+			l = idx + 1;
+		else {
+			gsize lsave, usave;
+			lsave = l;
+			usave = u;
+			if (start) {
+				while (l < u) {
+					idx = (l + u) / 2;
+					p = (((const gchar *) base) + (idx * size));
+					comparison = (*compare) (key, p, closure);
+					if (comparison <= 0)
+						u = idx;
+					else
+						l = idx + 1;
+				}
+				*start = l;
+
+				l = lsave;
+				u = usave;
+			}
+			if (end) {
+				while (l < u) {
+					idx = (l + u) / 2;
+					p = (((const gchar *) base) + (idx * size));
+					comparison = (*compare) (key, p, closure);
+					if (comparison < 0)
+						u = idx;
+					else
+						l = idx + 1;
+				}
+				*end = l;
+			}
+			return;
+		}
+	}
+
+	if (start)
+		*start = l;
+	if (end)
+		*end = l;
+}
+
+/* Function to do a last minute fixup of the AM/PM stuff if the locale
+ * and gettext haven't done it right. Most English speaking countries
+ * except the USA use the 24 hour clock (UK, Australia etc). However
+ * since they are English nobody bothers to write a language
+ * translation (gettext) file. So the locale turns off the AM/PM, but
+ * gettext does not turn on the 24 hour clock. Leaving a mess.
+ *
+ * This routine checks if AM/PM are defined in the locale, if not it
+ * forces the use of the 24 hour clock.
+ *
+ * The function itself is a front end on strftime and takes exactly
+ * the same arguments.
+ *
+ * TODO: Actually remove the '%p' from the fixed up string so that
+ * there isn't a stray space.
+ */
+
+gsize
+e_strftime_fix_am_pm (gchar *str,
+                      gsize max,
+                      const gchar *fmt,
+                      const struct tm *tm)
+{
+	gchar buf[10];
+	gchar *sp;
+	gchar *ffmt;
+	gsize ret;
+
+	if (strstr (fmt, "%p") == NULL && strstr (fmt, "%P") == NULL) {
+		/* No AM/PM involved - can use the fmt string directly */
+		ret = e_strftime (str, max, fmt, tm);
+	} else {
+		/* Get the AM/PM symbol from the locale */
+		e_strftime (buf, 10, "%p", tm);
+
+		if (buf[0]) {
+			/* AM/PM have been defined in the locale
+			 * so we can use the fmt string directly. */
+			ret = e_strftime (str, max, fmt, tm);
+		} else {
+			/* No AM/PM defined by locale
+			 * must change to 24 hour clock. */
+			ffmt = g_strdup (fmt);
+			for (sp = ffmt; (sp = strstr (sp, "%l")); sp++) {
+				/* Maybe this should be 'k', but I have never
+				 * seen a 24 clock actually use that format. */
+				sp[1]='H';
+			}
+			for (sp = ffmt; (sp = strstr (sp, "%I")); sp++) {
+				sp[1]='H';
+			}
+			ret = e_strftime (str, max, ffmt, tm);
+			g_free (ffmt);
+		}
+	}
+
+	return (ret);
+}
+
+gsize
+e_utf8_strftime_fix_am_pm (gchar *str,
+                           gsize max,
+                           const gchar *fmt,
+                           const struct tm *tm)
+{
+	gsize sz, ret;
+	gchar *locale_fmt, *buf;
+
+	locale_fmt = g_locale_from_utf8 (fmt, -1, NULL, &sz, NULL);
+	if (!locale_fmt)
+		return 0;
+
+	ret = e_strftime_fix_am_pm (str, max, locale_fmt, tm);
+	if (!ret) {
+		g_free (locale_fmt);
+		return 0;
+	}
+
+	buf = g_locale_to_utf8 (str, ret, NULL, &sz, NULL);
+	if (!buf) {
+		g_free (locale_fmt);
+		return 0;
+	}
+
+	if (sz >= max) {
+		gchar *tmp = buf + max - 1;
+		tmp = g_utf8_find_prev_char (buf, tmp);
+		if (tmp)
+			sz = tmp - buf;
+		else
+			sz = 0;
+	}
+	memcpy (str, buf, sz);
+	str[sz] = '\0';
+	g_free (locale_fmt);
+	g_free (buf);
+	return sz;
+}
+
+/**
+ * e_get_month_name:
+ * @month: month index
+ * @abbreviated: if %TRUE, abbreviate the month name
+ *
+ * Returns the localized name for @month.  If @abbreviated is %TRUE,
+ * returns the locale's abbreviated month name.
+ *
+ * Returns: localized month name
+ **/
+const gchar *
+e_get_month_name (GDateMonth month,
+                  gboolean abbreviated)
+{
+	/* Make the indices correspond to the enum values. */
+	static const gchar *abbr_names[G_DATE_DECEMBER + 1];
+	static const gchar *full_names[G_DATE_DECEMBER + 1];
+	static gboolean first_time = TRUE;
+
+	g_return_val_if_fail (month >= G_DATE_JANUARY, NULL);
+	g_return_val_if_fail (month <= G_DATE_DECEMBER, NULL);
+
+	if (G_UNLIKELY (first_time)) {
+		gchar buffer[256];
+		GDateMonth ii;
+		GDate date;
+
+		memset (abbr_names, 0, sizeof (abbr_names));
+		memset (full_names, 0, sizeof (full_names));
+
+		/* First Julian day was in January. */
+		g_date_set_julian (&date, 1);
+
+		for (ii = G_DATE_JANUARY; ii <= G_DATE_DECEMBER; ii++) {
+			g_date_strftime (buffer, sizeof (buffer), "%b", &date);
+			abbr_names[ii] = g_intern_string (buffer);
+			g_date_strftime (buffer, sizeof (buffer), "%B", &date);
+			full_names[ii] = g_intern_string (buffer);
+			g_date_add_months (&date, 1);
+		}
+
+		first_time = FALSE;
+	}
+
+	return abbreviated ? abbr_names[month] : full_names[month];
+}
+
+/**
+ * e_get_weekday_name:
+ * @weekday: weekday index
+ * @abbreviated: if %TRUE, abbreviate the weekday name
+ *
+ * Returns the localized name for @weekday.  If @abbreviated is %TRUE,
+ * returns the locale's abbreviated weekday name.
+ *
+ * Returns: localized weekday name
+ **/
+const gchar *
+e_get_weekday_name (GDateWeekday weekday,
+                    gboolean abbreviated)
+{
+	/* Make the indices correspond to the enum values. */
+	static const gchar *abbr_names[G_DATE_SUNDAY + 1];
+	static const gchar *full_names[G_DATE_SUNDAY + 1];
+	static gboolean first_time = TRUE;
+
+	g_return_val_if_fail (weekday >= G_DATE_MONDAY, NULL);
+	g_return_val_if_fail (weekday <= G_DATE_SUNDAY, NULL);
+
+	if (G_UNLIKELY (first_time)) {
+		gchar buffer[256];
+		GDateWeekday ii;
+		GDate date;
+
+		memset (abbr_names, 0, sizeof (abbr_names));
+		memset (full_names, 0, sizeof (full_names));
+
+		/* First Julian day was a Monday. */
+		g_date_set_julian (&date, 1);
+
+		for (ii = G_DATE_MONDAY; ii <= G_DATE_SUNDAY; ii++) {
+			g_date_strftime (buffer, sizeof (buffer), "%a", &date);
+			abbr_names[ii] = g_intern_string (buffer);
+			g_date_strftime (buffer, sizeof (buffer), "%A", &date);
+			full_names[ii] = g_intern_string (buffer);
+			g_date_add_days (&date, 1);
+		}
+
+		first_time = FALSE;
+	}
+
+	return abbreviated ? abbr_names[weekday] : full_names[weekday];
+}
+
+/* Evolution Locks for crash recovery */
+static const gchar *
+get_lock_filename (void)
+{
+	static gchar *filename = NULL;
+
+	if (G_UNLIKELY (filename == NULL))
+		filename = g_build_filename (
+			e_get_user_config_dir (), ".running", NULL);
+
+	return filename;
+}
+
+gboolean
+e_file_lock_create (void)
+{
+	const gchar *filename = get_lock_filename ();
+	gboolean status = FALSE;
+	FILE *file;
+
+	file = g_fopen (filename, "w");
+	if (file != NULL) {
+		/* The lock file also serves as a PID file. */
+		g_fprintf (
+			file, "%" G_GINT64_FORMAT "\n",
+			(gint64) getpid ());
+		fclose (file);
+		status = TRUE;
+	} else {
+		const gchar *errmsg = g_strerror (errno);
+		g_warning ("Lock file creation failed: %s", errmsg);
+	}
+
+	return status;
+}
+
+void
+e_file_lock_destroy (void)
+{
+	const gchar *filename = get_lock_filename ();
+
+	if (g_unlink (filename) == -1) {
+		const gchar *errmsg = g_strerror (errno);
+		g_warning ("Lock file deletion failed: %s", errmsg);
+	}
+}
+
+gboolean
+e_file_lock_exists (void)
+{
+	const gchar *filename = get_lock_filename ();
+
+	return g_file_test (filename, G_FILE_TEST_EXISTS);
+}
+
+/**
+ * e_util_guess_mime_type:
+ * @filename: a local file name, or URI
+ * @localfile: %TRUE to check the file content, FALSE to check only the name
+ *
+ * Tries to determine the MIME type for @filename.  Free the returned
+ * string with g_free().
+ *
+ * Returns: the MIME type of @filename, or %NULL if the the MIME type could
+ *          not be determined
+ **/
+gchar *
+e_util_guess_mime_type (const gchar *filename,
+                        gboolean localfile)
+{
+	gchar *mime_type = NULL;
+
+	g_return_val_if_fail (filename != NULL, NULL);
+
+	if (localfile) {
+		GFile *file;
+		GFileInfo *fi;
+
+		if (strstr (filename, "://"))
+			file = g_file_new_for_uri (filename);
+		else
+			file = g_file_new_for_path (filename);
+
+		fi = g_file_query_info (
+			file, G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+			G_FILE_QUERY_INFO_NONE, NULL, NULL);
+		if (fi) {
+			mime_type = g_content_type_get_mime_type (
+				g_file_info_get_content_type (fi));
+			g_object_unref (fi);
+		}
+
+		g_object_unref (file);
+	}
+
+	if (!mime_type) {
+		/* file doesn't exists locally, thus guess based on the filename */
+		gboolean uncertain = FALSE;
+		gchar *content_type;
+
+		content_type = g_content_type_guess (filename, NULL, 0, &uncertain);
+		if (content_type) {
+			mime_type = g_content_type_get_mime_type (content_type);
+			g_free (content_type);
+		}
+	}
+
+	return mime_type;
+}
+
+GSList *
+e_util_get_category_filter_options (void)
+{
+	GSList *res = NULL;
+	GList *clist, *l;
+
+	clist = e_categories_get_list ();
+	for (l = clist; l; l = l->next) {
+		const gchar *cname = l->data;
+		struct _filter_option *fo;
+
+		if (!e_categories_is_searchable (cname))
+			continue;
+
+		fo = g_new0 (struct _filter_option, 1);
+
+		fo->title = g_strdup (cname);
+		fo->value = g_strdup (cname);
+		res = g_slist_prepend (res, fo);
+	}
+
+	g_list_free (clist);
+
+	return g_slist_reverse (res);
+}
+
+/**
+ * e_util_get_searchable_categories:
+ *
+ * Returns list of searchable categories only. The list should
+ * be freed with g_list_free() when done with it, but the items
+ * are internal strings, names of categories, which should not
+ * be touched in other than read-only way, in other words the same
+ * restrictions as for e_categories_get_list() applies here too.
+ **/
+GList *
+e_util_get_searchable_categories (void)
+{
+	GList *res = NULL, *all_categories, *l;
+
+	all_categories = e_categories_get_list ();
+	for (l = all_categories; l; l = l->next) {
+		const gchar *cname = l->data;
+
+		if (e_categories_is_searchable (cname))
+			res = g_list_prepend (res, (gpointer) cname);
+	}
+
+	g_list_free (all_categories);
+
+	return g_list_reverse (res);
+}
+
+/**
+ * e_binding_transform_color_to_string:
+ * @binding: a #GBinding
+ * @source_value: a #GValue of type #GDK_TYPE_COLOR
+ * @target_value: a #GValue of type #G_TYPE_STRING
+ * @not_used: not used
+ *
+ * Transforms a #GdkColor value to a color string specification.
+ *
+ * Returns: %TRUE always
+ **/
+gboolean
+e_binding_transform_color_to_string (GBinding *binding,
+                                     const GValue *source_value,
+                                     GValue *target_value,
+                                     gpointer not_used)
+{
+	const GdkColor *color;
+	gchar *string;
+
+	g_return_val_if_fail (G_IS_BINDING (binding), FALSE);
+
+	color = g_value_get_boxed (source_value);
+	if (!color) {
+		g_value_set_string (target_value, "");
+	} else {
+		/* encode color manually, because css styles expect colors in #rrggbb,
+		 * not in #rrrrggggbbbb, which is a result of gdk_color_to_string()
+		*/
+		string = g_strdup_printf (
+			"#%02x%02x%02x",
+			(gint) color->red * 256 / 65536,
+			(gint) color->green * 256 / 65536,
+			(gint) color->blue * 256 / 65536);
+		g_value_set_string (target_value, string);
+		g_free (string);
+	}
+
+	return TRUE;
+}
+
+/**
+ * e_binding_transform_string_to_color:
+ * @binding: a #GBinding
+ * @source_value: a #GValue of type #G_TYPE_STRING
+ * @target_value: a #GValue of type #GDK_TYPE_COLOR
+ * @not_used: not used
+ *
+ * Transforms a color string specification to a #GdkColor.
+ *
+ * Returns: %TRUE if color string specification was valid
+ **/
+gboolean
+e_binding_transform_string_to_color (GBinding *binding,
+                                     const GValue *source_value,
+                                     GValue *target_value,
+                                     gpointer not_used)
+{
+	GdkColor color;
+	const gchar *string;
+	gboolean success = FALSE;
+
+	g_return_val_if_fail (G_IS_BINDING (binding), FALSE);
+
+	string = g_value_get_string (source_value);
+	if (gdk_color_parse (string, &color)) {
+		g_value_set_boxed (target_value, &color);
+		success = TRUE;
+	}
+
+	return success;
+}
+
+/**
+ * e_binding_transform_source_to_uid:
+ * @binding: a #GBinding
+ * @source_value: a #GValue of type #E_TYPE_SOURCE
+ * @target_value: a #GValue of type #G_TYPE_STRING
+ * @registry: an #ESourceRegistry
+ *
+ * Transforms an #ESource object to its UID string.
+ *
+ * Returns: %TRUE if @source_value was an #ESource object
+ **/
+gboolean
+e_binding_transform_source_to_uid (GBinding *binding,
+                                   const GValue *source_value,
+                                   GValue *target_value,
+                                   ESourceRegistry *registry)
+{
+	ESource *source;
+	const gchar *string;
+	gboolean success = FALSE;
+
+	g_return_val_if_fail (G_IS_BINDING (binding), FALSE);
+	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);
+
+	source = g_value_get_object (source_value);
+	if (E_IS_SOURCE (source)) {
+		string = e_source_get_uid (source);
+		g_value_set_string (target_value, string);
+		success = TRUE;
+	}
+
+	return success;
+}
+
+/**
+ * e_binding_transform_uid_to_source:
+ * @binding: a #GBinding
+ * @source_value: a #GValue of type #G_TYPE_STRING
+ * @target_value: a #GValue of type #E_TYPE_SOURCe
+ * @registry: an #ESourceRegistry
+ *
+ * Transforms an #ESource UID string to the corresponding #ESource object
+ * in @registry.
+ *
+ * Returns: %TRUE if @registry had an #ESource object with a matching
+ *          UID string
+ **/
+gboolean
+e_binding_transform_uid_to_source (GBinding *binding,
+                                   const GValue *source_value,
+                                   GValue *target_value,
+                                   ESourceRegistry *registry)
+{
+	ESource *source;
+	const gchar *string;
+	gboolean success = FALSE;
+
+	g_return_val_if_fail (G_IS_BINDING (binding), FALSE);
+	g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);
+
+	string = g_value_get_string (source_value);
+	if (string == NULL || *string == '\0')
+		return FALSE;
+
+	source = e_source_registry_ref_source (registry, string);
+	if (source != NULL) {
+		g_value_take_object (target_value, source);
+		success = TRUE;
+	}
+
+	return success;
+}