path: root/e-util/e-util.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; 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)
 *
 */

/**
 * SECTION: e-util
 * @include: e-util/e-util.h
 **/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#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/e-data-server-util.h>
#include <libedataserver/e-categories.h>
#include <libedataserver/e-source-list.h>

#include "filter/e-filter-option.h"

#include "e-util.h"
#include "e-util-private.h"

/**
 * 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 ("ghelp:" 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_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_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_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;
}

/* 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_type_traverse:
 * @parent_type: the root #GType to traverse from
 * @func: the function to call for each visited #GType
 * @user_data: user data to pass to the function
 *
 * Calls @func for all instantiable subtypes of @parent_type.
 *
 * This is often useful for extending functionality by way of #EModule.
 * A module may register a subtype of @parent_type in its e_module_load()
 * function.  Then later on the application will call e_type_traverse()
 * to instantiate all registered subtypes of @parent_type.
 **/
void
e_type_traverse (GType parent_type,
                 ETypeFunc func,
                 gpointer user_data)
{
    GType *children;
    guint n_children, ii;

    g_return_if_fail (func != NULL);

    children = g_type_children (parent_type, &n_children);

    for (ii = 0; ii < n_children; ii++) {
        GType type = children[ii];

        /* Recurse over the child's children. */
        e_type_traverse (type, func, user_data);

        /* Skip abstract types. */
        if (G_TYPE_IS_ABSTRACT (type))
            continue;

        func (type, user_data);
    }

    g_free (children);
}

/**
 * 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)
{
    guint16 red;
    guint16 green;
    guint16 blue;

    g_return_val_if_fail (color != NULL, 0);

    red = color->red >> 8;
    green = color->green >> 8;
    blue = color->blue >> 8;

    return (guint32) (((red << 16) | (green << 8) | blue) & 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];
}

/**
 * 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;
}

/* 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;
}

/* XXX: Should e-util/ really depend on filter/ ?? */
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_util_set_source_combo_box_list:
 * @source_combo_box: an #ESourceComboBox
 * @source_gconf_path: GConf path with sources to use in an #ESourceList
 *
 * Sets an #ESourceList of a given GConf path to an #ESourceComboBox.
 **/
void
e_util_set_source_combo_box_list (GtkWidget *source_combo_box,
                                  const gchar *source_gconf_path)
{
    ESourceList *source_list;
    GConfClient *gconf_client;

    g_return_if_fail (source_combo_box != NULL);
    g_return_if_fail (source_gconf_path != NULL);

    gconf_client = gconf_client_get_default ();
    source_list = e_source_list_new_for_gconf (
        gconf_client, source_gconf_path);
    g_object_set (source_combo_box, "source-list", source_list, NULL);
    g_object_unref (source_list);
    g_object_unref (gconf_client);
}

/**
 * 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);
    string = gdk_color_to_string (color);
    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_enum_value_to_nick:
 * @binding: a #GBinding
 * @source_value: a #GValue whose type is derived from #G_TYPE_ENUM
 * @target_value: a #GValue of type #G_TYPE_STRING
 * @not_used: not used
 *
 * Transforms an enumeration value to its corresponding nickname.
 *
 * Returns: %TRUE if the enum value has a corresponding nickname
 **/
gboolean
e_binding_transform_enum_value_to_nick (GBinding *binding,
                                        const GValue *source_value,
                                        GValue *target_value,
                                        gpointer not_used)
{
    GEnumClass *enum_class;
    GEnumValue *enum_value;
    gint value;
    gboolean success = FALSE;

    g_return_val_if_fail (G_IS_BINDING (binding), FALSE);

    enum_class = g_type_class_peek (G_VALUE_TYPE (source_value));
    g_return_val_if_fail (G_IS_ENUM_CLASS (enum_class), FALSE);

    value = g_value_get_enum (source_value);
    enum_value = g_enum_get_value (enum_class, value);
    if (enum_value != NULL) {
        g_value_set_string (target_value, enum_value->value_nick);
        success = TRUE;
    }

    return success;
}

/**
 * e_binding_transform_enum_nick_to_value:
 * @binding: a #GBinding
 * @source_value: a #GValue of type #G_TYPE_STRING
 * @target_value: a #GValue whose type is derived from #G_TYPE_ENUM
 * @not_used: not_used
 *
 * Transforms an enumeration nickname to its corresponding value.
 *
 * Returns: %TRUE if the enum nickname has a corresponding value
 **/
gboolean
e_binding_transform_enum_nick_to_value (GBinding *binding,
                                        const GValue *source_value,
                                        GValue *target_value,
                                        gpointer not_used)
{
    GEnumClass *enum_class;
    GEnumValue *enum_value;
    const gchar *string;
    gboolean success = FALSE;

    g_return_val_if_fail (G_IS_BINDING (binding), FALSE);

    enum_class = g_type_class_peek (G_VALUE_TYPE (target_value));
    g_return_val_if_fail (G_IS_ENUM_CLASS (enum_class), FALSE);

    string = g_value_get_string (source_value);
    enum_value = g_enum_get_value_by_nick (enum_class, string);
    if (enum_value != NULL) {
        g_value_set_enum (target_value, enum_value->value);
        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
 * @source_list: an #ESourceList
 *
 * 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,
                                   ESourceList *source_list)
{
    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_LIST (source_list), FALSE);

    source = g_value_get_object (source_value);
    if (E_IS_SOURCE (source)) {
        string = e_source_peek_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
 * @source_list: an #ESourceList
 *
 * Transforms an #ESource UID string to the corresponding #ESource object
 * in @source_list.
 *
 * Returns: %TRUE if @source_list 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,
                                   ESourceList *source_list)
{
    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_LIST (source_list), FALSE);

    string = g_value_get_string (source_value);
    if (string == NULL || *string == '\0')
        return FALSE;

    source = e_source_list_peek_source_by_uid (source_list, string);
    if (source != NULL) {
        g_value_set_object (target_value, source);
        success = TRUE;
    }

    return success;
}