path: root/e-util/e-misc-utils.c

/*
 * 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.
 *
 * 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 Lesser General Public License
 * along with this 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 (gpointer user_data)
{
    WindowData *data = user_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 = e_named_timeout_add_seconds (
        1, 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);
        data->timeout_id = 0;
    }

    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);
        data->timeout_id = 0;
    }

    /* Reset the flags so the window position and size are not
     * accidentally reverted to their default value at the next run. */
    data->flags = 0;

    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 = 0;

            if (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 ();
    }
}

/**
 * e_load_ui_manager_definition:
 * @ui_manager: a #GtkUIManager
 * @basename: basename of the UI definition file
 *
 * Loads a UI definition into @ui_manager from Evolution's UI directory.
 * Failure here is fatal, since the application can't function without
 * its UI definitions.
 *
 * Returns: The merge ID for the merged UI.  The merge ID can be used to
 *          unmerge the UI with gtk_ui_manager_remove_ui().
 **/
guint
e_load_ui_manager_definition (GtkUIManager *ui_manager,
                              const gchar *basename)
{
    gchar *filename;
    guint merge_id;
    GError *error = NULL;

    g_return_val_if_fail (GTK_IS_UI_MANAGER (ui_manager), 0);
    g_return_val_if_fail (basename != NULL, 0);

    filename = g_build_filename (EVOLUTION_UIDIR, basename, NULL);
    merge_id = gtk_ui_manager_add_ui_from_file (
        ui_manager, filename, &error);
    g_free (filename);

    if (error != NULL) {
        g_error ("%s: %s", basename, error->message);
        g_assert_not_reached ();
    }

    return merge_id;
}

/* 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;
}

/**
 * e_str_replace_string
 * @text: the string to replace
 * @before: the string to be replaced
 * @after: the string to replaced with
 *
 * Replaces every occurrence of the string @before with the string @after in
 * the string @text and returns a #GString with result that should be freed
 * with g_string_free().
 *
 * Returns: a newly-allocated #GString
 */
GString *
e_str_replace_string (const gchar *text,
                      const gchar *before,
                      const gchar *after)
{
    const gchar *p, *next;
    GString *str;
    gint find_len;

    g_return_val_if_fail (text != NULL, NULL);
    g_return_val_if_fail (before != NULL, NULL);
    g_return_val_if_fail (*before, NULL);

    find_len = strlen (before);
    str = g_string_new ("");

    p = text;
    while (next = strstr (p, before), next) {
        if (p < next)
            g_string_append_len (str, p, next - p);

        if (after && *after)
            g_string_append (str, after);

        p = next + find_len;
    }

    g_string_append (str, p);

    return str;
}

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 (const 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 (const 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);
}

/**
 * e_rgba_to_color:
 * @rgba: a source #GdkRGBA
 * @color: a destination #GdkColor
 *
 * Converts @rgba into @color, but loses the alpha chnnel from @rgba.
 **/
void
e_rgba_to_color (const GdkRGBA *rgba,
         GdkColor *color)
{
    g_return_if_fail (rgba != NULL);
    g_return_if_fail (color != NULL);

    color->pixel = 0;
    color->red = rgba->red * 65535.0;
    color->green = rgba->green * 65535.0;
    color->blue = rgba->blue * 65535.0;
}

/**
 * e_utils_get_theme_color:
 * @widget: a #GtkWidget instance
 * @color_names: comma-separated theme color names
 * @fallback_color_ident: fallback color identificator, in a format for gdk_rgba_parse()
 * @rgba: where to store the read color
 *
 * Reads named theme color from a #GtkStyleContext of @widget.
 * The @color_names are read one after another from left to right,
 * the next are meant as fallbacks, in case the theme doesn't
 * define the previous color. If none is found then the @fallback_color_ident
 * is set to @rgba.
 **/
void
e_utils_get_theme_color (GtkWidget *widget,
             const gchar *color_names,
             const gchar *fallback_color_ident,
             GdkRGBA *rgba)
{
    GtkStyleContext *style_context;
    gchar **names;
    gint ii;

    g_return_if_fail (GTK_IS_WIDGET (widget));
    g_return_if_fail (color_names != NULL);
    g_return_if_fail (fallback_color_ident != NULL);
    g_return_if_fail (rgba != NULL);

    style_context = gtk_widget_get_style_context (widget);

    names = g_strsplit (color_names, ",", -1);
    for (ii = 0; names && names[ii]; ii++) {
        if (gtk_style_context_lookup_color (style_context, names[ii], rgba)) {
            g_strfreev (names);
            return;
        }
    }

    g_strfreev (names);

    g_warn_if_fail (gdk_rgba_parse (rgba, fallback_color_ident));
}

/**
 * e_utils_get_theme_color_color:
 * @widget: a #GtkWidget instance
 * @color_names: comma-separated theme color names
 * @fallback_color_ident: fallback color identificator, in a format for gdk_rgba_parse()
 * @color: where to store the read color
 *
 * The same as e_utils_get_theme_color(), only populates  #GdkColor,
 * instead of #GdkRGBA.
 **/
void
e_utils_get_theme_color_color (GtkWidget *widget,
                   const gchar *color_names,
                   const gchar *fallback_color_ident,
                   GdkColor *color)
{
    GdkRGBA rgba;

    g_return_if_fail (GTK_IS_WIDGET (widget));
    g_return_if_fail (color_names != NULL);
    g_return_if_fail (fallback_color_ident != NULL);
    g_return_if_fail (color != NULL);

    e_utils_get_theme_color (widget, color_names, fallback_color_ident, &rgba);

    e_rgba_to_color (&rgba, color);
}

/* This is copied from gtk+ sources */
static void
rgb_to_hls (gdouble *r,
        gdouble *g,
        gdouble *b)
{
    gdouble min;
    gdouble max;
    gdouble red;
    gdouble green;
    gdouble blue;
    gdouble h, l, s;
    gdouble delta;

    red = *r;
    green = *g;
    blue = *b;

    if (red > green) {
        if (red > blue)
            max = red;
        else
            max = blue;
      
        if (green < blue)
            min = green;
        else
            min = blue;
    } else {
        if (green > blue)
            max = green;
        else
            max = blue;
      
        if (red < blue)
            min = red;
        else
            min = blue;
    }

    l = (max + min) / 2;
    s = 0;
    h = 0;

    if (max != min) {
        if (l <= 0.5)
            s = (max - min) / (max + min);
        else
            s = (max - min) / (2 - max - min);
      
        delta = max -min;
        if (red == max)
            h = (green - blue) / delta;
        else if (green == max)
            h = 2 + (blue - red) / delta;
        else if (blue == max)
            h = 4 + (red - green) / delta;

        h *= 60;
        if (h < 0.0)
            h += 360;
    }

    *r = h;
    *g = l;
    *b = s;
}

/* This is copied from gtk+ sources */
static void
hls_to_rgb (gdouble *h,
        gdouble *l,
        gdouble *s)
{
    gdouble hue;
    gdouble lightness;
    gdouble saturation;
    gdouble m1, m2;
    gdouble r, g, b;

    lightness = *l;
    saturation = *s;

    if (lightness <= 0.5)
        m2 = lightness * (1 + saturation);
    else
        m2 = lightness + saturation - lightness * saturation;
    m1 = 2 * lightness - m2;
  
    if (saturation == 0) {
        *h = lightness;
        *l = lightness;
        *s = lightness;
    } else {
        hue = *h + 120;
        while (hue > 360)
            hue -= 360;
        while (hue < 0)
            hue += 360;
      
        if (hue < 60)
            r = m1 + (m2 - m1) * hue / 60;
        else if (hue < 180)
            r = m2;
        else if (hue < 240)
            r = m1 + (m2 - m1) * (240 - hue) / 60;
        else
            r = m1;

        hue = *h;
        while (hue > 360)
            hue -= 360;
        while (hue < 0)
            hue += 360;

        if (hue < 60)
            g = m1 + (m2 - m1) * hue / 60;
        else if (hue < 180)
            g = m2;
        else if (hue < 240)
            g = m1 + (m2 - m1) * (240 - hue) / 60;
        else
            g = m1;

        hue = *h - 120;
        while (hue > 360)
            hue -= 360;
        while (hue < 0)
            hue += 360;

        if (hue < 60)
            b = m1 + (m2 - m1) * hue / 60;
        else if (hue < 180)
            b = m2;
        else if (hue < 240)
            b = m1 + (m2 - m1) * (240 - hue) / 60;
        else
            b = m1;

        *h = r;
        *l = g;
        *s = b;
    }
}

/* This is copied from gtk+ sources */
void
e_utils_shade_color (const GdkRGBA *a,
             GdkRGBA *b,
             gdouble mult)
{
    gdouble red;
    gdouble green;
    gdouble blue;

    g_return_if_fail (a != NULL);
    g_return_if_fail (b != NULL);

    red = a->red;
    green = a->green;
    blue = a->blue;

    rgb_to_hls (&red, &green, &blue);

    green *= mult;
    if (green > 1.0)
        green = 1.0;
    else if (green < 0.0)
        green = 0.0;

    blue *= mult;
    if (blue > 1.0)
        blue = 1.0;
    else if (blue < 0.0)
        blue = 0.0;

    hls_to_rgb (&red, &green, &blue);

    b->red = red;
    b->green = green;
    b->blue = blue;
}

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++;
            /* coverity[fallthrough] */
        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];
}

/**
 * e_weekday_get_next:
 * @weekday: a #GDateWeekday
 *
 * Returns the #GDateWeekday after @weekday.
 *
 * Returns: the day after @weekday
 **/
GDateWeekday
e_weekday_get_next (GDateWeekday weekday)
{
    GDateWeekday next;

    /* Verbose for readability. */
    switch (weekday) {
        case G_DATE_MONDAY:
            next = G_DATE_TUESDAY;
            break;
        case G_DATE_TUESDAY:
            next = G_DATE_WEDNESDAY;
            break;
        case G_DATE_WEDNESDAY:
            next = G_DATE_THURSDAY;
            break;
        case G_DATE_THURSDAY:
            next = G_DATE_FRIDAY;
            break;
        case G_DATE_FRIDAY:
            next = G_DATE_SATURDAY;
            break;
        case G_DATE_SATURDAY:
            next = G_DATE_SUNDAY;
            break;
        case G_DATE_SUNDAY:
            next = G_DATE_MONDAY;
            break;
        default:
            next = G_DATE_BAD_WEEKDAY;
            break;
    }

    return next;
}

/**
 * e_weekday_get_prev:
 * @weekday: a #GDateWeekday
 *
 * Returns the #GDateWeekday before @weekday.
 *
 * Returns: the day before @weekday
 **/
GDateWeekday
e_weekday_get_prev (GDateWeekday weekday)
{
    GDateWeekday prev;

    /* Verbose for readability. */
    switch (weekday) {
        case G_DATE_MONDAY:
            prev = G_DATE_SUNDAY;
            break;
        case G_DATE_TUESDAY:
            prev = G_DATE_MONDAY;
            break;
        case G_DATE_WEDNESDAY:
            prev = G_DATE_TUESDAY;
            break;
        case G_DATE_THURSDAY:
            prev = G_DATE_WEDNESDAY;
            break;
        case G_DATE_FRIDAY:
            prev = G_DATE_THURSDAY;
            break;
        case G_DATE_SATURDAY:
            prev = G_DATE_FRIDAY;
            break;
        case G_DATE_SUNDAY:
            prev = G_DATE_SATURDAY;
            break;
        default:
            prev = G_DATE_BAD_WEEKDAY;
            break;
    }

    return prev;
}

/**
 * e_weekday_add_days:
 * @weekday: a #GDateWeekday
 * @n_days: number of days to add
 *
 * Increments @weekday by @n_days.
 *
 * Returns: a #GDateWeekday
 **/
GDateWeekday
e_weekday_add_days (GDateWeekday weekday,
                    guint n_days)
{
    g_return_val_if_fail (
        g_date_valid_weekday (weekday),
        G_DATE_BAD_WEEKDAY);

    n_days %= 7;  /* Weekdays repeat every 7 days. */

    while (n_days-- > 0)
        weekday = e_weekday_get_next (weekday);

    return weekday;
}

/**
 * e_weekday_subtract_days:
 * @weekday: a #GDateWeekday
 * @n_days: number of days to subtract
 *
 * Decrements @weekday by @n_days.
 *
 * Returns: a #GDateWeekday
 **/
GDateWeekday
e_weekday_subtract_days (GDateWeekday weekday,
                         guint n_days)
{
    g_return_val_if_fail (
        g_date_valid_weekday (weekday),
        G_DATE_BAD_WEEKDAY);

    n_days %= 7;  /* Weekdays repeat every 7 days. */

    while (n_days-- > 0)
        weekday = e_weekday_get_prev (weekday);

    return weekday;
}

/**
 * e_weekday_get_days_between:
 * @weekday1: a #GDateWeekday
 * @weekday2: a #GDateWeekday
 *
 * Counts the number of days starting at @weekday1 and ending at @weekday2.
 *
 * Returns: the number of days
 **/
guint
e_weekday_get_days_between (GDateWeekday weekday1,
                            GDateWeekday weekday2)
{
    guint n_days = 0;

    g_return_val_if_fail (g_date_valid_weekday (weekday1), 0);
    g_return_val_if_fail (g_date_valid_weekday (weekday2), 0);

    while (weekday1 != weekday2) {
        n_days++;
        weekday1 = e_weekday_get_next (weekday1);
    }

    return n_days;
}

/**
 * e_weekday_to_tm_wday:
 * @weekday: a #GDateWeekday
 *
 * Converts a #GDateWeekday to the numbering used in
 * <structname>struct tm</structname>.
 *
 * Returns: number of days since Sunday (0 - 6)
 **/
gint
e_weekday_to_tm_wday (GDateWeekday weekday)
{
    gint tm_wday;

    switch (weekday) {
        case G_DATE_MONDAY:
            tm_wday = 1;
            break;
        case G_DATE_TUESDAY:
            tm_wday = 2;
            break;
        case G_DATE_WEDNESDAY:
            tm_wday = 3;
            break;
        case G_DATE_THURSDAY:
            tm_wday = 4;
            break;
        case G_DATE_FRIDAY:
            tm_wday = 5;
            break;
        case G_DATE_SATURDAY:
            tm_wday = 6;
            break;
        case G_DATE_SUNDAY:
            tm_wday = 0;
            break;
        default:
            g_return_val_if_reached (-1);
    }

    return tm_wday;
}

/**
 * e_weekday_from_tm_wday:
 * @tm_wday: number of days since Sunday (0 - 6)
 *
 * Converts a weekday in the numbering used in
 * <structname>struct tm</structname> to a #GDateWeekday.
 *
 * Returns: a #GDateWeekday
 **/
GDateWeekday
e_weekday_from_tm_wday (gint tm_wday)
{
    GDateWeekday weekday;

    switch (tm_wday) {
        case 0:
            weekday = G_DATE_SUNDAY;
            break;
        case 1:
            weekday = G_DATE_MONDAY;
            break;
        case 2:
            weekday = G_DATE_TUESDAY;
            break;
        case 3:
            weekday = G_DATE_WEDNESDAY;
            break;
        case 4:
            weekday = G_DATE_THURSDAY;
            break;
        case 5:
            weekday = G_DATE_FRIDAY;
            break;
        case 6:
            weekday = G_DATE_SATURDAY;
            break;
        default:
            g_return_val_if_reached (G_DATE_BAD_WEEKDAY);
    }

    return 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_dup_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_full (clist, g_free);

    return g_slist_reverse (res);
}

/**
 * e_util_dup_searchable_categories:
 *
 * Returns a list of the searchable categories, with each item being a UTF-8
 * category name. The list should be freed with g_list_free() when done with it,
 * and the items should be freed with g_free(). Everything can be freed at once
 * using g_list_free_full().
 *
 * Returns: (transfer full) (element-type utf8): a list of searchable category
 * names; free with g_list_free_full()
 */
GList *
e_util_dup_searchable_categories (void)
{
    GList *res = NULL, *all_categories, *l;

    all_categories = e_categories_dup_list ();
    for (l = all_categories; l; l = l->next) {
        gchar *cname = l->data;

        /* Steal the string from e_categories_dup_list(). */
        if (e_categories_is_searchable (cname))
            res = g_list_prepend (res, (gpointer) cname);
        else
            g_free (cname);
    }

    /* NOTE: Do *not* free the items. They have been freed or stolen
     * above. */
    g_list_free (all_categories);

    return g_list_reverse (res);
}

gboolean
e_util_allow_auth_prompt_and_refresh_client_sync (EClient *client,
                          GCancellable *cancellable,
                          GError **error)
{
    g_return_val_if_fail (E_IS_CLIENT (client), FALSE);

    if (!e_source_allow_auth_prompt_sync (e_client_get_source (client), cancellable, error))
        return FALSE;

    return e_client_refresh_sync (client, cancellable, error);
}

static void
util_allow_auth_prompt_and_refresh_client_thread (GTask *task,
                          gpointer source_object,
                          gpointer task_data,
                          GCancellable *cancellable)
{
    gboolean success;
    GError *local_error = NULL;

    success = e_util_allow_auth_prompt_and_refresh_client_sync (
        E_CLIENT (source_object),
        cancellable, &local_error);

    if (local_error != NULL) {
        g_task_return_error (task, local_error);
    } else {
        g_task_return_boolean (task, success);
    }
}

void
e_util_allow_auth_prompt_and_refresh_client (EClient *client,
                         GCancellable *cancellable,
                         GAsyncReadyCallback callback,
                         gpointer user_data)
{
    GTask *task;

    g_return_if_fail (E_IS_CLIENT (client));

    task = g_task_new (client, cancellable, callback, user_data);
    g_task_set_source_tag (task, e_util_allow_auth_prompt_and_refresh_client);

    g_task_run_in_thread (task, util_allow_auth_prompt_and_refresh_client_thread);

    g_object_unref (task);
}

gboolean
e_util_allow_auth_prompt_and_refresh_client_finish (EClient *client,
                            GAsyncResult *result,
                            GError **error)
{
    g_return_val_if_fail (E_IS_CLIENT (client), FALSE);
    g_return_val_if_fail (g_task_is_valid (result, client), FALSE);

    g_return_val_if_fail (
        g_async_result_is_tagged (
        result, e_util_allow_auth_prompt_and_refresh_client), FALSE);

    return g_task_propagate_boolean (G_TASK (result), error);
}

/**
 * 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;
}

/**
 * e_binding_transform_text_non_null:
 * @binding: a #GBinding
 * @source_value: a #GValue of type #G_TYPE_STRING
 * @target_value: a #GValue of type #G_TYPE_STRING
 * @user_data: custom user data, unused
 *
 * Transforms a text value to a text value which is never NULL;
 * an empty string is used instead of NULL.
 *
 * Returns: %TRUE on success
 **/
gboolean
e_binding_transform_text_non_null (GBinding *binding,
                   const GValue *source_value,
                   GValue *target_value,
                   gpointer user_data)
{
    const gchar *str;

    g_return_val_if_fail (G_IS_BINDING (binding), FALSE);
    g_return_val_if_fail (source_value != NULL, FALSE);
    g_return_val_if_fail (target_value != NULL, FALSE);

    str = g_value_get_string (source_value);
    if (!str)
        str = "";

    g_value_set_string (target_value, str);

    return TRUE;
}

/**
 * e_binding_bind_object_text_property:
 * @source: the source #GObject
 * @source_property: the text property on the source to bind
 * @target: the target #GObject
 * @target_property: the text property on the target to bind
 * @flags: flags to pass to g_object_bind_property_full()
 *
 * Installs a new text property object binding, using g_object_bind_property_full(),
 * with transform functions to make sure that a NULL pointer is not
 * passed in either way. Instead of NULL an empty string is used.
 *
 * Returns: the #GBinding instance representing the binding between the two #GObject instances;
 *    there applies the same rules to it as for the result of g_object_bind_property_full().
 **/
GBinding *
e_binding_bind_object_text_property (gpointer source,
                     const gchar *source_property,
                     gpointer target,
                     const gchar *target_property,
                     GBindingFlags flags)
{
    GObjectClass *klass;
    GParamSpec *property;

    g_return_val_if_fail (G_IS_OBJECT (source), NULL);
    g_return_val_if_fail (source_property != NULL, NULL);
    g_return_val_if_fail (G_IS_OBJECT (target), NULL);
    g_return_val_if_fail (target_property != NULL, NULL);

    klass = G_OBJECT_GET_CLASS (source);
    property = g_object_class_find_property (klass, source_property);
    g_return_val_if_fail (property != NULL, NULL);
    g_return_val_if_fail (property->value_type == G_TYPE_STRING, NULL);

    klass = G_OBJECT_GET_CLASS (target);
    property = g_object_class_find_property (klass, target_property);
    g_return_val_if_fail (property != NULL, NULL);
    g_return_val_if_fail (property->value_type == G_TYPE_STRING, NULL);

    return g_object_bind_property_full (source, source_property,
                        target, target_property,
                        flags,
                        e_binding_transform_text_non_null,
                        e_binding_transform_text_non_null,
                        NULL, NULL);
}

typedef struct _EConnectNotifyData {
    GConnectFlags flags;
    GValue *old_value;

    GCallback c_handler;
    gpointer user_data;
} EConnectNotifyData;

static EConnectNotifyData *
e_connect_notify_data_new (GCallback c_handler,
               gpointer user_data,
               guint32 connect_flags)
{
    EConnectNotifyData *connect_data;

    connect_data = g_new0 (EConnectNotifyData, 1);
    connect_data->flags = connect_flags;
    connect_data->c_handler = c_handler;
    connect_data->user_data = user_data;

    return connect_data;
}

static void
e_connect_notify_data_free (EConnectNotifyData *data)
{
    if (!data)
        return;

    if (data->old_value) {
        g_value_unset (data->old_value);
        g_free (data->old_value);
    }
    g_free (data);
}

static gboolean
e_value_equal (GValue *value1,
           GValue *value2)
{
    if (value1 == value2)
        return TRUE;

    if (!value1 || !value2)
        return FALSE;

    #define testType(_uc,_lc) G_STMT_START { \
        if (G_VALUE_HOLDS_ ## _uc (value1)) \
            return g_value_get_ ## _lc (value1) == g_value_get_ ## _lc (value2); \
    } G_STMT_END

    testType (BOOLEAN, boolean);
    testType (BOXED, boxed);
    testType (CHAR, schar);
    testType (DOUBLE, double);
    testType (ENUM, enum);
    testType (FLAGS, flags);
    testType (FLOAT, float);
    testType (GTYPE, gtype);
    testType (INT, int);
    testType (INT64, int64);
    testType (LONG, long);
    testType (OBJECT, object);
    testType (POINTER, pointer);
    testType (UCHAR, uchar);
    testType (UINT, uint);
    testType (UINT64, uint64);
    testType (ULONG, ulong);

    #undef testType

    if (G_VALUE_HOLDS_PARAM (value1)) {
        GParamSpec *param1, *param2;

        param1 = g_value_get_param (value1);
        param2 = g_value_get_param (value2);

        return param1 && param2 &&
            g_strcmp0 (param1->name, param2->name) == 0 &&
            param1->flags == param2->flags &&
            param1->value_type == param2->value_type &&
            param1->owner_type == param2->owner_type;
    } else if (G_VALUE_HOLDS_STRING (value1)) {
        const gchar *string1, *string2;

        string1 = g_value_get_string (value1);
        string2 = g_value_get_string (value2);

        return g_strcmp0 (string1, string2) == 0;
    } else if (G_VALUE_HOLDS_VARIANT (value1)) {
        GVariant *variant1, *variant2;

        variant1 = g_value_get_variant (value1);
        variant2 = g_value_get_variant (value2);

        return variant1 == variant2 ||
            (variant1 && variant2 && g_variant_equal (variant1, variant2));
    }

    return FALSE;
}

static void
e_signal_connect_notify_cb (gpointer instance,
                GParamSpec *param,
                gpointer user_data)
{
    EConnectNotifyData *connect_data = user_data;
    GValue *value;

    g_return_if_fail (connect_data != NULL);

    value = g_new0 (GValue, 1);
    g_value_init (value, param->value_type);
    g_object_get_property (instance, param->name, value);

    if (!e_value_equal (connect_data->old_value, value)) {
        typedef void (* NotifyCBType) (gpointer instance, GParamSpec *param, gpointer user_data);
        NotifyCBType c_handler = (NotifyCBType) connect_data->c_handler;

        if (connect_data->old_value) {
            g_value_unset (connect_data->old_value);
            g_free (connect_data->old_value);
        }
        connect_data->old_value = value;

        if (connect_data->flags == G_CONNECT_SWAPPED) {
            c_handler (connect_data->user_data, param, instance);
        } else {
            c_handler (instance, param, connect_data->user_data);
        }
    } else {
        g_value_unset (value);
        g_free (value);
    }
}

/**
 * e_signal_connect_notify:
 *
 * This installs a special handler in front of @c_handler, which will
 * call the @c_handler only if the property value changed since the last
 * time it was checked. Due to this, these handlers cannot be disconnected
 * by by any of the g_signal_handlers_* functions, but only with the returned
 * handler ID. A convenient e_signal_disconnect_notify_handler() was added
 * to make it easier.
 **/
gulong
e_signal_connect_notify (gpointer instance,
             const gchar *notify_name,
             GCallback c_handler,
             gpointer user_data)
{
    EConnectNotifyData *connect_data;

    g_return_val_if_fail (g_str_has_prefix (notify_name, "notify::"), 0);

    connect_data = e_connect_notify_data_new (c_handler, user_data, 0);

    return g_signal_connect_data (instance,
                      notify_name,
                      G_CALLBACK (e_signal_connect_notify_cb),
                      connect_data,
                      (GClosureNotify) e_connect_notify_data_free,
                      0);
}

/**
 * e_signal_connect_notify_after:
 *
 * This installs a special handler in front of @c_handler, which will
 * call the @c_handler only if the property value changed since the last
 * time it was checked. Due to this, these handlers cannot be disconnected
 * by by any of the g_signal_handlers_* functions, but only with the returned
 * handler ID. A convenient e_signal_disconnect_notify_handler() was added
 * to make it easier.
 **/
gulong
e_signal_connect_notify_after (gpointer instance,
                   const gchar *notify_name,
                   GCallback c_handler,
                   gpointer user_data)
{
    EConnectNotifyData *connect_data;

    g_return_val_if_fail (g_str_has_prefix (notify_name, "notify::"), 0);

    connect_data = e_connect_notify_data_new (c_handler, user_data, G_CONNECT_AFTER);

    return g_signal_connect_data (instance,
                      notify_name,
                      G_CALLBACK (e_signal_connect_notify_cb),
                      connect_data,
                      (GClosureNotify) e_connect_notify_data_free,
                      G_CONNECT_AFTER);
}

/**
 * e_signal_connect_notify_swapped:
 *
 * This installs a special handler in front of @c_handler, which will
 * call the @c_handler only if the property value changed since the last
 * time it was checked. Due to this, these handlers cannot be disconnected
 * by by any of the g_signal_handlers_* functions, but only with the returned
 * handler ID. A convenient e_signal_disconnect_notify_handler() was added
 * to make it easier.
 **/
gulong
e_signal_connect_notify_swapped (gpointer instance,
                 const gchar *notify_name,
                 GCallback c_handler,
                 gpointer user_data)
{
    EConnectNotifyData *connect_data;

    g_return_val_if_fail (g_str_has_prefix (notify_name, "notify::"), 0);

    connect_data = e_connect_notify_data_new (c_handler, user_data, G_CONNECT_SWAPPED);

    return g_signal_connect_data (instance,
                      notify_name,
                      G_CALLBACK (e_signal_connect_notify_cb),
                      connect_data,
                      (GClosureNotify) e_connect_notify_data_free,
                      0);
}

/**
 * e_signal_connect_notify_object:
 *
 * This installs a special handler in front of @c_handler, which will
 * call the @c_handler only if the property value changed since the last
 * time it was checked. Due to this, these handlers cannot be disconnected
 * by by any of the g_signal_handlers_* functions, but only with the returned
 * handler ID. A convenient e_signal_disconnect_notify_handler() was added
 * to make it easier.
 **/
gulong
e_signal_connect_notify_object (gpointer instance,
                const gchar *notify_name,
                GCallback c_handler,
                gpointer gobject,
                GConnectFlags connect_flags)
{
    EConnectNotifyData *connect_data;
    GClosure *closure;

    g_return_val_if_fail (g_str_has_prefix (notify_name, "notify::"), 0);

    if (!gobject) {
        if ((connect_flags & G_CONNECT_SWAPPED) != 0)
            return e_signal_connect_notify_swapped (instance, notify_name, c_handler, gobject);
        else if ((connect_flags & G_CONNECT_AFTER) != 0)
            e_signal_connect_notify_after (instance, notify_name, c_handler, gobject);
        else
            g_warn_if_fail (connect_flags == 0);

        return e_signal_connect_notify (instance, notify_name, c_handler, gobject);
    }

    g_return_val_if_fail (G_IS_OBJECT (gobject), 0);

    connect_data = e_connect_notify_data_new (c_handler, gobject, connect_flags & G_CONNECT_SWAPPED);
    closure = g_cclosure_new (
        G_CALLBACK (e_signal_connect_notify_cb),
        connect_data,
        (GClosureNotify) e_connect_notify_data_free);

    g_object_watch_closure (G_OBJECT (gobject), closure);

    return g_signal_connect_closure (instance,
                     notify_name,
                     closure,
                     connect_flags & G_CONNECT_AFTER);
}

/**
 * e_signal_disconnect_notify_handler:
 *
 * Convenient handler disconnect function to be used with
 * returned handler IDs from:
 *    e_signal_connect_notify()
 *    e_signal_connect_notify_after()
 *    e_signal_connect_notify_swapped()
 *    e_signal_connect_notify_object()
 * but not necessarily only with these functions.
 **/
void
e_signal_disconnect_notify_handler (gpointer instance,
                    gulong *handler_id)
{
    g_return_if_fail (instance != NULL);
    g_return_if_fail (handler_id != NULL);

    if (!*handler_id)
        return;

    g_signal_handler_disconnect (instance, *handler_id);
    *handler_id = 0;
}