path: root/modules/mail/e-mail-shell-backend.c

/*
 * e-mail-shell-backend.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/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include "e-mail-shell-backend.h"

#include <glib/gi18n.h>

#include <shell/e-shell.h>
#include <shell/e-shell-window.h>

#include <composer/e-msg-composer.h>

#include <libemail-engine/e-mail-folder-utils.h>
#include <libemail-engine/e-mail-session.h>
#include <libemail-engine/mail-config.h>
#include <libemail-engine/mail-ops.h>

#include <mail/e-mail-browser.h>
#include <mail/e-mail-config-assistant.h>
#include <mail/e-mail-config-window.h>
#include <mail/e-mail-reader.h>
#include <mail/em-composer-utils.h>
#include <mail/em-folder-utils.h>
#include <mail/em-utils.h>
#include <mail/mail-send-recv.h>
#include <mail/mail-vfolder-ui.h>
#include <mail/importers/mail-importer.h>
#include <mail/e-mail-ui-session.h>

#include <em-format/e-mail-parser.h>
#include <em-format/e-mail-formatter.h>
#include <em-format/e-mail-part-utils.h>

#include "e-mail-shell-sidebar.h"
#include "e-mail-shell-view.h"
#include "em-account-prefs.h"
#include "em-composer-prefs.h"
#include "em-mailer-prefs.h"
#include "em-network-prefs.h"

#define E_MAIL_SHELL_BACKEND_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_SHELL_BACKEND, EMailShellBackendPrivate))

#define E_MAIL_SHELL_BACKEND_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_SHELL_BACKEND, EMailShellBackendPrivate))

#define BACKEND_NAME "mail"

struct _EMailShellBackendPrivate {
    gint mail_sync_in_progress;
    guint mail_sync_source_id;
    gpointer assistant; /* weak pointer, when adding new mail account */
    gpointer editor;    /* weak pointer, when editing a mail account */
};

static void mbox_create_preview_cb (GObject *preview, GtkWidget **preview_widget);
static void mbox_fill_preview_cb (GObject *preview, CamelMimeMessage *msg);

G_DEFINE_DYNAMIC_TYPE (
    EMailShellBackend,
    e_mail_shell_backend,
    E_TYPE_MAIL_BACKEND)

static void
mail_shell_backend_init_importers (void)
{
    EImportClass *import_class;
    EImportImporter *importer;

    import_class = g_type_class_ref (e_import_get_type ());

    importer = mbox_importer_peek ();
    e_import_class_add_importer (import_class, importer, NULL, NULL);
    mbox_importer_set_preview_funcs (
        mbox_create_preview_cb, mbox_fill_preview_cb);

    importer = elm_importer_peek ();
    e_import_class_add_importer (import_class, importer, NULL, NULL);

    importer = pine_importer_peek ();
    e_import_class_add_importer (import_class, importer, NULL, NULL);
}

static void
mail_shell_backend_mail_icon_cb (EShellWindow *shell_window,
                                 const gchar *icon_name)
{
    GtkAction *action;

    action = e_shell_window_get_shell_view_action (
        shell_window, BACKEND_NAME);
    gtk_action_set_icon_name (action, icon_name);
}

static void
action_mail_folder_new_cb (GtkAction *action,
                           EShellWindow *shell_window)
{
    EMFolderTree *folder_tree = NULL;
    EMailShellSidebar *mail_shell_sidebar;
    EMailSession *session;
    EShellSidebar *shell_sidebar;
    EShellView *shell_view;
    const gchar *view_name;

    /* Take care not to unnecessarily load the mail shell view. */
    view_name = e_shell_window_get_active_view (shell_window);
    if (g_strcmp0 (view_name, BACKEND_NAME) != 0) {
        EShell *shell;
        EShellBackend *shell_backend;
        EMailBackend *backend;

        shell = e_shell_window_get_shell (shell_window);

        shell_backend =
            e_shell_get_backend_by_name (shell, BACKEND_NAME);
        g_return_if_fail (E_IS_MAIL_BACKEND (shell_backend));

        backend = E_MAIL_BACKEND (shell_backend);
        session = e_mail_backend_get_session (backend);

        goto exit;
    }

    shell_view = e_shell_window_get_shell_view (shell_window, view_name);
    shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);

    mail_shell_sidebar = E_MAIL_SHELL_SIDEBAR (shell_sidebar);
    folder_tree = e_mail_shell_sidebar_get_folder_tree (mail_shell_sidebar);
    session = em_folder_tree_get_session (folder_tree);

exit:
    em_folder_utils_create_folder (
        GTK_WINDOW (shell_window), session, folder_tree, NULL);
}

static void
action_mail_account_new_cb (GtkAction *action,
                            EShellWindow *shell_window)
{
    EShell *shell;
    EShellBackend *shell_backend;

    g_return_if_fail (shell_window != NULL);

    shell = e_shell_window_get_shell (shell_window);
    shell_backend = e_shell_get_backend_by_name (shell, BACKEND_NAME);
    g_return_if_fail (E_IS_MAIL_SHELL_BACKEND (shell_backend));

    e_mail_shell_backend_new_account (
        E_MAIL_SHELL_BACKEND (shell_backend),
        GTK_WINDOW (shell_window));
}

static void
action_mail_message_new_cb (GtkAction *action,
                            EShellWindow *shell_window)
{
    EMailShellSidebar *mail_shell_sidebar;
    EShellSidebar *shell_sidebar;
    EShellView *shell_view;
    EShell *shell;
    ESourceRegistry *registry;
    EMFolderTree *folder_tree;
    CamelFolder *folder = NULL;
    CamelStore *store;
    GList *list;
    const gchar *extension_name;
    const gchar *view_name;
    gboolean no_transport_defined;
    gchar *folder_name;

    shell = e_shell_window_get_shell (shell_window);
    registry = e_shell_get_registry (shell);

    extension_name = E_SOURCE_EXTENSION_MAIL_TRANSPORT;
    list = e_source_registry_list_sources (registry, extension_name);
    no_transport_defined = (list == NULL);
    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    if (no_transport_defined)
        return;

    /* Take care not to unnecessarily load the mail shell view. */
    view_name = e_shell_window_get_active_view (shell_window);
    if (g_strcmp0 (view_name, BACKEND_NAME) != 0)
        goto exit;

    shell_view = e_shell_window_get_shell_view (shell_window, view_name);
    shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);

    mail_shell_sidebar = E_MAIL_SHELL_SIDEBAR (shell_sidebar);
    folder_tree = e_mail_shell_sidebar_get_folder_tree (mail_shell_sidebar);

    if (em_folder_tree_get_selected (folder_tree, &store, &folder_name)) {

        /* FIXME This blocks and is not cancellable. */
        folder = camel_store_get_folder_sync (
            store, folder_name, 0, NULL, NULL);

        g_object_unref (store);
        g_free (folder_name);
    }

exit:
    em_utils_compose_new_message (shell, folder);
}

static GtkActionEntry item_entries[] = {

    { "mail-message-new",
      "mail-message-new",
      NC_("New", "_Mail Message"),
      "<Shift><Control>m",
      N_("Compose a new mail message"),
      G_CALLBACK (action_mail_message_new_cb) }
};

static GtkActionEntry source_entries[] = {

    { "mail-account-new",
      "evolution-mail",
      NC_("New", "Mail Acco_unt"),
      NULL,
      N_("Create a new mail account"),
      G_CALLBACK (action_mail_account_new_cb) },

    { "mail-folder-new",
      "folder-new",
      NC_("New", "Mail _Folder"),
      NULL,
      N_("Create a new mail folder"),
      G_CALLBACK (action_mail_folder_new_cb) }
};

static void
mail_shell_backend_sync_store_done_cb (CamelStore *store,
                                       gpointer user_data)
{
    EMailShellBackend *mail_shell_backend = user_data;

    mail_shell_backend->priv->mail_sync_in_progress--;
}

static gboolean
mail_shell_backend_mail_sync (EMailShellBackend *mail_shell_backend)
{
    EShell *shell;
    EShellBackend *shell_backend;
    EMailBackend *backend;
    EMailSession *session;
    GList *list, *link;

    shell_backend = E_SHELL_BACKEND (mail_shell_backend);
    shell = e_shell_backend_get_shell (shell_backend);

    /* Obviously we can only sync in online mode. */
    if (!e_shell_get_online (shell))
        goto exit;

    /* If a sync is still in progress, skip this round. */
    if (mail_shell_backend->priv->mail_sync_in_progress)
        goto exit;

    backend = E_MAIL_BACKEND (mail_shell_backend);
    session = e_mail_backend_get_session (backend);

    list = camel_session_list_services (CAMEL_SESSION (session));

    for (link = list; link != NULL; link = g_list_next (link)) {
        CamelService *service;

        service = CAMEL_SERVICE (link->data);

        if (!CAMEL_IS_STORE (service))
            continue;

        mail_shell_backend->priv->mail_sync_in_progress++;

        mail_sync_store (
            CAMEL_STORE (service), FALSE,
            mail_shell_backend_sync_store_done_cb,
            mail_shell_backend);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

exit:
    return TRUE;
}

static gboolean
mail_shell_backend_handle_uri_cb (EShell *shell,
                                  const gchar *uri,
                                  EMailShellBackend *mail_shell_backend)
{
    gboolean handled = FALSE;

    if (g_str_has_prefix (uri, "mailto:")) {
        em_utils_compose_new_message_with_mailto (shell, uri, NULL);
        handled = TRUE;
    }

    return handled;
}

static void
mail_shell_backend_prepare_for_quit_cb (EShell *shell,
                                        EActivity *activity,
                                        EShellBackend *shell_backend)
{
    EMailShellBackendPrivate *priv;

    priv = E_MAIL_SHELL_BACKEND_GET_PRIVATE (shell_backend);

    /* Prevent a sync from starting while trying to shutdown. */
    if (priv->mail_sync_source_id > 0) {
        g_source_remove (priv->mail_sync_source_id);
        priv->mail_sync_source_id = 0;
    }
}

static void
mail_shell_backend_window_weak_notify_cb (EShell *shell,
                                          GObject *where_the_object_was)
{
    g_signal_handlers_disconnect_by_func (
        shell, mail_shell_backend_mail_icon_cb,
        where_the_object_was);
}

static void
mail_shell_backend_window_added_cb (GtkApplication *application,
                                    GtkWindow *window,
                                    EShellBackend *shell_backend)
{
    EShell *shell = E_SHELL (application);
    EMailBackend *backend;
    EMailSession *session;
    const gchar *backend_name;

    backend = E_MAIL_BACKEND (shell_backend);
    session = e_mail_backend_get_session (backend);

    /* This applies to both the composer and signature editor. */
    if (GTKHTML_IS_EDITOR (window)) {
        GSettings *settings;
        GList *spell_languages;
        gboolean active = TRUE;

        spell_languages = e_load_spell_languages ();
        gtkhtml_editor_set_spell_languages (
            GTKHTML_EDITOR (window), spell_languages);
        g_list_free (spell_languages);

        settings = g_settings_new ("org.gnome.evolution.mail");

        /* Express mode does not honor this setting. */
        if (!e_shell_get_express_mode (shell))
            active = g_settings_get_boolean (
                settings, "composer-send-html");

        g_object_unref (settings);

        gtkhtml_editor_set_html_mode (GTKHTML_EDITOR (window), active);
    }

    if (E_IS_MSG_COMPOSER (window)) {
        /* Start the mail backend if it isn't already.  This
         * may be necessary when opening a new composer window
         * from a shell view other than mail. */
        e_shell_backend_start (shell_backend);

        /* Integrate the new composer into the mail module. */
        em_configure_new_composer (
            E_MSG_COMPOSER (window), session);
        return;
    }

    if (!E_IS_SHELL_WINDOW (window))
        return;

    backend_name = E_SHELL_BACKEND_GET_CLASS (shell_backend)->name;

    e_shell_window_register_new_item_actions (
        E_SHELL_WINDOW (window), backend_name,
        item_entries, G_N_ELEMENTS (item_entries));

    e_shell_window_register_new_source_actions (
        E_SHELL_WINDOW (window), backend_name,
        source_entries, G_N_ELEMENTS (source_entries));

    g_signal_connect_swapped (
        shell, "event::mail-icon",
        G_CALLBACK (mail_shell_backend_mail_icon_cb), window);

    g_object_weak_ref (
        G_OBJECT (window), (GWeakNotify)
        mail_shell_backend_window_weak_notify_cb, shell);
}

static void
mail_shell_backend_disconnect_done_cb (GObject *source_object,
                                       GAsyncResult *result,
                                       gpointer user_data)
{
    CamelService *service;
    EActivity *activity;
    EAlertSink *alert_sink;
    GError *error = NULL;

    service = CAMEL_SERVICE (source_object);
    activity = E_ACTIVITY (user_data);

    alert_sink = e_activity_get_alert_sink (activity);

    camel_service_disconnect_finish (service, result, &error);

    if (e_activity_handle_cancellation (activity, error)) {
        g_error_free (error);

    } else if (error != NULL) {
        e_alert_submit (
            alert_sink,
            "mail:disconnect",
            camel_service_get_display_name (service),
            error->message, NULL);
        g_error_free (error);

    } else {
        e_activity_set_state (activity, E_ACTIVITY_COMPLETED);
    }

    g_object_unref (activity);
}

static void
mail_shell_backend_changes_committed_cb (EMailConfigWindow *window,
                                         EMailShellBackend *mail_shell_backend)
{
    EMailSession *session;
    EShell *shell;
    EShellBackend *shell_backend;
    ESource *original_source;
    CamelService *service;
    EActivity *activity;
    GCancellable *cancellable;
    GList *list, *link;
    const gchar *uid;

    session = e_mail_config_window_get_session (window);
    original_source = e_mail_config_window_get_original_source (window);

    uid = e_source_get_uid (original_source);
    service = camel_session_ref_service (CAMEL_SESSION (session), uid);
    g_return_if_fail (service != NULL);

    shell_backend = E_SHELL_BACKEND (mail_shell_backend);

    shell = e_shell_backend_get_shell (shell_backend);
    list = gtk_application_get_windows (GTK_APPLICATION (shell));

    activity = e_activity_new ();

    /* Find an EShellWindow to serve as an EAlertSink. */
    for (link = list; link != NULL; link = g_list_next (link)) {
        GtkWindow *window = GTK_WINDOW (link->data);

        if (E_IS_SHELL_WINDOW (window)) {
            EAlertSink *alert_sink = E_ALERT_SINK (window);
            e_activity_set_alert_sink (activity, alert_sink);
        }
    }

    cancellable = camel_operation_new ();
    e_activity_set_cancellable (activity, cancellable);

    e_shell_backend_add_activity (shell_backend, activity);

    camel_service_disconnect (
        service, TRUE, G_PRIORITY_DEFAULT, cancellable,
        mail_shell_backend_disconnect_done_cb, activity);

    g_object_unref (cancellable);

    g_object_unref (service);
}

static void
mail_shell_backend_constructed (GObject *object)
{
    EShell *shell;
    EShellBackend *shell_backend;
    EMailSession *mail_session;
    CamelService *vstore;
    GtkWidget *preferences_window;
    GSettings *settings;

    shell_backend = E_SHELL_BACKEND (object);
    shell = e_shell_backend_get_shell (shell_backend);

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_mail_shell_backend_parent_class)->constructed (object);

    mail_shell_backend_init_importers ();

    g_signal_connect (
        shell, "handle-uri",
        G_CALLBACK (mail_shell_backend_handle_uri_cb),
        shell_backend);

    g_signal_connect (
        shell, "prepare-for-quit",
        G_CALLBACK (mail_shell_backend_prepare_for_quit_cb),
        shell_backend);

    g_signal_connect (
        shell, "window-added",
        G_CALLBACK (mail_shell_backend_window_added_cb),
        shell_backend);

    /* Setup preference widget factories */
    preferences_window = e_shell_get_preferences_window (shell);

    e_preferences_window_add_page (
        E_PREFERENCES_WINDOW (preferences_window),
        "mail-accounts",
        "preferences-mail-accounts",
        _("Mail Accounts"),
        "mail-account-management",
        em_account_prefs_new,
        100);

    e_preferences_window_add_page (
        E_PREFERENCES_WINDOW (preferences_window),
        "mail",
        "preferences-mail",
        _("Mail Preferences"),
        "index#mail-basic",
        em_mailer_prefs_new,
        300);

    e_preferences_window_add_page (
        E_PREFERENCES_WINDOW (preferences_window),
        "composer",
        "preferences-composer",
        _("Composer Preferences"),
        "index#mail-composing",
        em_composer_prefs_new,
        400);

    e_preferences_window_add_page (
        E_PREFERENCES_WINDOW (preferences_window),
        "system-network-proxy",
        "preferences-system-network-proxy",
        _("Network Preferences"),
        NULL,
        em_network_prefs_new,
        500);

    mail_session = e_mail_backend_get_session (E_MAIL_BACKEND (object));
    vstore = camel_session_ref_service (
        CAMEL_SESSION (mail_session), E_MAIL_SESSION_VFOLDER_UID);
    g_return_if_fail (vstore != NULL);

    settings = g_settings_new ("org.gnome.evolution.mail");

    g_settings_bind (
        settings, "enable-unmatched",
        vstore, "unmatched-enabled",
        G_SETTINGS_BIND_DEFAULT);

    g_object_unref (settings);

    g_object_unref (vstore);
}

static void
mail_shell_backend_start (EShellBackend *shell_backend)
{
    EMailShellBackendPrivate *priv;
    EMailBackend *backend;
    EMailSession *session;
    EMailAccountStore *account_store;
    GError *error = NULL;

    priv = E_MAIL_SHELL_BACKEND_GET_PRIVATE (shell_backend);

    backend = E_MAIL_BACKEND (shell_backend);
    session = e_mail_backend_get_session (backend);
    account_store = e_mail_ui_session_get_account_store (E_MAIL_UI_SESSION (session));

    /* XXX Should we be calling this unconditionally? */
    vfolder_load_storage (session);

    if (!e_mail_account_store_load_sort_order (account_store, &error)) {
        g_warning ("%s: %s", G_STRFUNC, error->message);
        g_error_free (error);
    }

    if (g_getenv ("CAMEL_FLUSH_CHANGES") != NULL)
        priv->mail_sync_source_id = g_timeout_add_seconds (
            mail_config_get_sync_timeout (),
            (GSourceFunc) mail_shell_backend_mail_sync,
            shell_backend);
}

static gboolean
mail_shell_backend_delete_junk_policy_decision (EMailBackend *backend)
{
    GSettings *settings;
    gboolean delete_junk;
    gint empty_date = 0;
    gint empty_days = 0;
    gint now;

    settings = g_settings_new ("org.gnome.evolution.mail");

    now = time (NULL) / 60 / 60 / 24;

    delete_junk = g_settings_get_boolean (settings, "junk-empty-on-exit");

    if (delete_junk) {
        empty_days = g_settings_get_int (
            settings, "junk-empty-on-exit-days");
        empty_date = g_settings_get_int (
            settings, "junk-empty-date");
    }

    delete_junk = delete_junk && (
        (empty_days == 0) ||
        (empty_days > 0 && empty_date + empty_days <= now));

    if (delete_junk)
        g_settings_set_int (settings, "junk-empty-date", now);

    g_object_unref (settings);

    return delete_junk;
}

static gboolean
mail_shell_backend_empty_trash_policy_decision (EMailBackend *backend)
{
    GSettings *settings;
    gboolean empty_trash;
    gint empty_date = 0;
    gint empty_days = 0;
    gint now;

    settings = g_settings_new ("org.gnome.evolution.mail");

    now = time (NULL) / 60 / 60 / 24;

    empty_trash = g_settings_get_boolean (settings, "trash-empty-on-exit");

    if (empty_trash) {
        empty_days = g_settings_get_int (
            settings, "trash-empty-on-exit-days");
        empty_date = g_settings_get_int (
            settings, "trash-empty-date");
    }

    empty_trash = empty_trash && (
        (empty_days == 0) ||
        (empty_days > 0 && empty_date + empty_days <= now));

    if (empty_trash)
        g_settings_set_int (settings, "trash-empty-date", now);

    g_object_unref (settings);

    return empty_trash;
}

static void
mail_shell_backend_dispose (GObject *object)
{
    EMailShellBackendPrivate *priv;

    priv = E_MAIL_SHELL_BACKEND (object)->priv;

    if (priv->assistant != NULL) {
        g_object_remove_weak_pointer (
            G_OBJECT (priv->assistant), &priv->assistant);
        priv->assistant = NULL;
    }

    if (priv->editor != NULL) {
        g_object_remove_weak_pointer (
            G_OBJECT (priv->editor), &priv->editor);
        priv->editor = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_mail_shell_backend_parent_class)->dispose (object);
}

static void
e_mail_shell_backend_class_init (EMailShellBackendClass *class)
{
    GObjectClass *object_class;
    EShellBackendClass *shell_backend_class;
    EMailBackendClass *mail_backend_class;

    g_type_class_add_private (class, sizeof (EMailShellBackendPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->constructed = mail_shell_backend_constructed;
    object_class->dispose = mail_shell_backend_dispose;

    shell_backend_class = E_SHELL_BACKEND_CLASS (class);
    shell_backend_class->shell_view_type = E_TYPE_MAIL_SHELL_VIEW;
    shell_backend_class->name = BACKEND_NAME;
    shell_backend_class->aliases = "";
    shell_backend_class->schemes = "mailto:email";
    shell_backend_class->sort_order = 200;
    shell_backend_class->preferences_page = "mail-accounts";
    shell_backend_class->start = mail_shell_backend_start;

    mail_backend_class = E_MAIL_BACKEND_CLASS (class);
    mail_backend_class->delete_junk_policy_decision =
        mail_shell_backend_delete_junk_policy_decision;
    mail_backend_class->empty_trash_policy_decision =
        mail_shell_backend_empty_trash_policy_decision;
}

static void
e_mail_shell_backend_class_finalize (EMailShellBackendClass *class)
{
}

static void
e_mail_shell_backend_init (EMailShellBackend *mail_shell_backend)
{
    mail_shell_backend->priv =
        E_MAIL_SHELL_BACKEND_GET_PRIVATE (mail_shell_backend);
}

void
e_mail_shell_backend_type_register (GTypeModule *type_module)
{
    /* XXX G_DEFINE_DYNAMIC_TYPE declares a static type registration
     *     function, so we have to wrap it with a public function in
     *     order to register types from a separate compilation unit. */
    e_mail_shell_backend_register_type (type_module);
}

void
e_mail_shell_backend_new_account (EMailShellBackend *mail_shell_backend,
                                  GtkWindow *parent)
{
    GtkWidget *assistant;
    EMailBackend *backend;
    EMailSession *session;

    g_return_if_fail (mail_shell_backend != NULL);
    g_return_if_fail (E_IS_MAIL_SHELL_BACKEND (mail_shell_backend));

    assistant = mail_shell_backend->priv->assistant;

    if (assistant != NULL) {
        gtk_window_present (GTK_WINDOW (assistant));
        return;
    }

    backend = E_MAIL_BACKEND (mail_shell_backend);
    session = e_mail_backend_get_session (backend);

    if (assistant == NULL)
        assistant = e_mail_config_assistant_new (session);

    gtk_window_set_transient_for (GTK_WINDOW (assistant), parent);
    gtk_widget_show (assistant);

    mail_shell_backend->priv->assistant = assistant;

    g_object_add_weak_pointer (
        G_OBJECT (mail_shell_backend->priv->assistant),
        &mail_shell_backend->priv->assistant);
}

void
e_mail_shell_backend_edit_account (EMailShellBackend *mail_shell_backend,
                                   GtkWindow *parent,
                                   ESource *mail_account)
{
    EMailShellBackendPrivate *priv;
    EMailBackend *backend;
    EMailSession *session;

    g_return_if_fail (E_IS_MAIL_SHELL_BACKEND (mail_shell_backend));
    g_return_if_fail (E_IS_SOURCE (mail_account));

    priv = mail_shell_backend->priv;

    backend = E_MAIL_BACKEND (mail_shell_backend);
    session = e_mail_backend_get_session (backend);

    if (priv->editor != NULL) {
        gtk_window_present (GTK_WINDOW (priv->editor));
        return;
    }

    priv->editor = e_mail_config_window_new (session, mail_account);
    gtk_window_set_transient_for (GTK_WINDOW (priv->editor), parent);
    g_object_add_weak_pointer (G_OBJECT (priv->editor), &priv->editor);

    g_signal_connect (
        priv->editor, "changes-committed",
        G_CALLBACK (mail_shell_backend_changes_committed_cb),
        mail_shell_backend);

    gtk_widget_show (priv->editor);
}

/******************* Code below here belongs elsewhere. *******************/

static GSList *
mail_labels_get_filter_options (gboolean include_none)
{
    EShell *shell;
    EShellBackend *shell_backend;
    EMailBackend *backend;
    EMailSession *session;
    EMailLabelListStore *label_store;
    GtkTreeModel *model;
    GtkTreeIter iter;
    GSList *list = NULL;
    gboolean valid;

    shell = e_shell_get_default ();
    shell_backend = e_shell_get_backend_by_name (shell, "mail");

    backend = E_MAIL_BACKEND (shell_backend);
    session = e_mail_backend_get_session (backend);
    label_store = e_mail_ui_session_get_label_store (
        E_MAIL_UI_SESSION (session));

    if (include_none) {
        struct _filter_option *option;

        option = g_new0 (struct _filter_option, 1);
        /* Translators: The first item in the list, to be able to set rule: [Label] [is/is-not] [None] */
        option->title = g_strdup (C_("label", "None"));
        option->value = g_strdup ("");
        list = g_slist_prepend (list, option);
    }

    model = GTK_TREE_MODEL (label_store);
    valid = gtk_tree_model_get_iter_first (model, &iter);

    while (valid) {
        struct _filter_option *option;
        gchar *name, *tag;

        name = e_mail_label_list_store_get_name (label_store, &iter);
        tag = e_mail_label_list_store_get_tag (label_store, &iter);

        if (g_str_has_prefix (tag, "$Label")) {
            gchar *tmp = tag;

            tag = g_strdup (tag + 6);

            g_free (tmp);
        }

        option = g_new0 (struct _filter_option, 1);
        option->title = e_str_without_underscores (name);
        option->value = tag;  /* takes ownership */
        list = g_slist_prepend (list, option);

        g_free (name);

        valid = gtk_tree_model_iter_next (model, &iter);
    }

    return g_slist_reverse (list);
}

GSList *
e_mail_labels_get_filter_options (void)
{
    return mail_labels_get_filter_options (TRUE);
}

GSList *
e_mail_labels_get_filter_options_without_none (void)
{
    return mail_labels_get_filter_options (FALSE);
}

static const gchar *
get_filter_option_value (EFilterPart *part,
                         const gchar *name)
{
    EFilterElement *elem;
    EFilterOption *opt;

    g_return_val_if_fail (part != NULL, NULL);
    g_return_val_if_fail (name != NULL, NULL);

    elem = e_filter_part_find_element (part, name);
    g_return_val_if_fail (elem != NULL, NULL);
    g_return_val_if_fail (E_IS_FILTER_OPTION (elem), NULL);

    opt = E_FILTER_OPTION (elem);
    return e_filter_option_get_current (opt);
}

static void
append_one_label_expr (GString *out,
                       const gchar *versus)
{
    GString *encoded;

    g_return_if_fail (out != NULL);
    g_return_if_fail (versus != NULL);

    encoded = g_string_new ("");
    camel_sexp_encode_string (encoded, versus);

    g_string_append_printf (
        out,
        " (= (user-tag \"label\") %s) (user-flag (+ \"$Label\" %s)) (user-flag %s)",
        encoded->str, encoded->str, encoded->str);

    g_string_free (encoded, TRUE);
}

void
e_mail_labels_get_filter_code (EFilterElement *element,
                               GString *out,
                               EFilterPart *part)
{
    const gchar *label_type, *versus;
    gboolean is_not;

    label_type = get_filter_option_value (part, "label-type");
    versus = get_filter_option_value (part, "versus");

    g_return_if_fail (label_type != NULL);
    g_return_if_fail (versus != NULL);

    is_not = g_str_equal (label_type, "is-not");

    if (!g_str_equal (label_type, "is") && !is_not) {
        g_warning ("%s: Unknown label-type: '%s'", G_STRFUNC, label_type);
        return;
    }

    /* the 'None' item has 'is-not' inverted */
    if (!*versus)
        is_not = !is_not;

    g_string_append (out, " (match-all (");
    if (is_not)
        g_string_append (out, " not (");
    g_string_append (out, "or");

    /* the 'None' item; "is None" means "has not set any label" */
    if (!*versus) {
        EShell *shell;
        EShellBackend *shell_backend;
        EMailBackend *backend;
        EMailSession *session;
        EMailLabelListStore *label_store;
        GtkTreeModel *model;
        GtkTreeIter iter;
        gboolean valid;

        shell = e_shell_get_default ();
        shell_backend = e_shell_get_backend_by_name (shell, "mail");

        backend = E_MAIL_BACKEND (shell_backend);
        session = e_mail_backend_get_session (backend);
        label_store = e_mail_ui_session_get_label_store (E_MAIL_UI_SESSION (session));

        model = GTK_TREE_MODEL (label_store);
        valid = gtk_tree_model_get_iter_first (model, &iter);

        while (valid) {
            gchar *tag;

            tag = e_mail_label_list_store_get_tag (label_store, &iter);

            if (g_str_has_prefix (tag, "$Label")) {
                gchar *tmp = tag;

                tag = g_strdup (tag + 6);

                g_free (tmp);
            }

            append_one_label_expr (out, tag);

            g_free (tag);

            valid = gtk_tree_model_iter_next (model, &iter);
        }
    } else {
        append_one_label_expr (out, versus);
    }

    if (is_not)
        g_string_append (out, ")");
    g_string_append (out, " ))");
}

static void
message_parsed_cb (GObject *source_object,
                   GAsyncResult *res,
                   gpointer user_data)
{
    EMailParser *parser = E_MAIL_PARSER (source_object);
    EMailPartList *parts_list;
    GObject *preview = user_data;
    EMailDisplay *display;
    CamelFolder *folder;
    SoupSession *soup_session;
    GHashTable *mails;
    const gchar *message_uid;
    gchar *mail_uri;

    display = g_object_get_data (preview, "mbox-imp-display");

    parts_list = e_mail_parser_parse_finish (parser, res, NULL);

    soup_session = webkit_get_default_session ();
    mails = g_object_get_data (G_OBJECT (soup_session), "mails");
    if (!mails) {
        mails = g_hash_table_new_full (
            g_str_hash, g_str_equal,
            (GDestroyNotify) g_free, NULL);
        g_object_set_data (
            G_OBJECT (soup_session), "mails", mails);
    }

    folder = e_mail_part_list_get_folder (parts_list);
    message_uid = e_mail_part_list_get_message_uid (parts_list);
    mail_uri = e_mail_part_build_uri (folder, message_uid, NULL, NULL);

    g_hash_table_insert (mails, mail_uri, parts_list);

    e_mail_display_set_parts_list (display, parts_list);
    e_mail_display_load (display, NULL);

    g_object_unref (parts_list);
}

/* utility functions for mbox importer */
static void
mbox_create_preview_cb (GObject *preview,
                        GtkWidget **preview_widget)
{
    EMailDisplay *display;

    g_return_if_fail (preview != NULL);
    g_return_if_fail (preview_widget != NULL);

    display = g_object_new (E_TYPE_MAIL_DISPLAY, NULL);
    g_object_set_data_full (
        preview, "mbox-imp-display",
        g_object_ref (display), g_object_unref);

    *preview_widget = GTK_WIDGET (display);
}

static void
mbox_fill_preview_cb (GObject *preview,
                      CamelMimeMessage *msg)
{
    EShell *shell;
    EMailDisplay *display;
    EMailParser *parser;
    EMailSession *mail_session;
    ESourceRegistry *registry;

    g_return_if_fail (preview != NULL);
    g_return_if_fail (msg != NULL);

    display = g_object_get_data (preview, "mbox-imp-display");
    g_return_if_fail (display != NULL);

    shell = e_shell_get_default ();
    registry = e_shell_get_registry (shell);
    mail_session = e_mail_session_new (registry);

    parser = e_mail_parser_new (CAMEL_SESSION (mail_session));
    e_mail_parser_parse (
        parser, NULL, msg->message_id, msg,
        message_parsed_cb, NULL, preview);

    g_object_unref (mail_session);
}