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)
 *
 */

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

#include <glib/gi18n.h>
#include <camel/camel-disco-store.h>
#include <camel/camel-offline-store.h>
#include <camel/camel-session.h>
#include <camel/camel-url.h>

#include "e-util/e-account-utils.h"
#include "e-util/e-binding.h"
#include "e-util/e-error.h"
#include "e-util/e-import.h"
#include "e-util/e-util.h"
#include "shell/e-shell.h"
#include "shell/e-shell-window.h"
#include "composer/e-msg-composer.h"
#include "widgets/misc/e-preferences-window.h"

#include "e-mail-shell-migrate.h"
#include "e-mail-shell-settings.h"
#include "e-mail-shell-sidebar.h"
#include "e-mail-shell-view.h"

#include "e-mail-browser.h"
#include "e-mail-local.h"
#include "e-mail-reader.h"
#include "e-mail-store.h"
#include "em-account-editor.h"
#include "em-account-prefs.h"
#include "em-composer-prefs.h"
#include "em-composer-utils.h"
#include "em-folder-utils.h"
#include "em-format-hook.h"
#include "em-format-html-display.h"
#include "em-mailer-prefs.h"
#include "em-network-prefs.h"
#include "em-utils.h"
#include "mail-config.h"
#include "mail-ops.h"
#include "mail-send-recv.h"
#include "mail-session.h"
#include "mail-vfolder.h"
#include "importers/mail-importer.h"

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

#define BACKEND_NAME "mail"
#define QUIT_POLL_INTERVAL 1  /* seconds */

struct _EMailShellBackendPrivate {
    gint mail_sync_in_progress;
    guint mail_sync_timeout_source_id;
};

static gpointer parent_class;
static GType mail_shell_backend_type;

extern gint camel_application_is_exiting;

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);

    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);
    g_object_set (action, "icon-name", icon_name, NULL);
}

static void
action_mail_folder_new_cb (GtkAction *action,
                           EShellWindow *shell_window)
{
    EMFolderTree *folder_tree = NULL;
    EMailShellSidebar *mail_shell_sidebar;
    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)
        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);

exit:
    em_folder_utils_create_folder (
        NULL, folder_tree, 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;
    EMFolderTree *folder_tree;
    const gchar *view_name;
    gchar *uri = NULL;

    if (!em_utils_check_user_can_send_mail ())
        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);
    uri = em_folder_tree_get_selected_uri (folder_tree);

exit:
    em_utils_compose_new_message (uri);

    g_free (uri);
}

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

static gboolean
mail_shell_backend_init_preferences (EShell *shell)
{
    EAccountList *account_list;
    GtkWidget *preferences_window;

    /* This is a main loop idle callback. */

    account_list = e_get_account_list ();
    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"),
        em_account_prefs_new (account_list),
        100);

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

    e_preferences_window_add_page (
        E_PREFERENCES_WINDOW (preferences_window),
        "composer",
        "preferences-composer",
        _("Composer Preferences"),
        em_composer_prefs_new (shell),
        400);

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

    return FALSE;
}

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 void
mail_shell_backend_sync_store_cb (CamelStore *store,
                                  EMailShellBackend *mail_shell_backend)
{
    if (!camel_application_is_exiting) {
        mail_shell_backend->priv->mail_sync_in_progress++;
        mail_sync_store (
            store, FALSE,
            mail_shell_backend_sync_store_done_cb,
            mail_shell_backend);
    }
}

static gboolean
mail_shell_backend_mail_sync (EMailShellBackend *mail_shell_backend)
{
    if (camel_application_is_exiting)
        return FALSE;

    if (mail_shell_backend->priv->mail_sync_in_progress)
        goto exit;

    if (session == NULL || !camel_session_is_online (session))
        goto exit;

    e_mail_store_foreach (
        (GHFunc) mail_shell_backend_sync_store_cb,
        mail_shell_backend);

exit:
    return !camel_application_is_exiting;
}

static void
mail_shell_backend_notify_online_cb (EShell *shell,
                                    GParamSpec *pspec,
                                    EShellBackend *shell_backend)
{
    gboolean online;

    online = e_shell_get_online (shell);
    camel_session_set_online (session, online);
}

static void
mail_shell_backend_handle_email_uri_cb (gchar *folder_uri,
                                        CamelFolder *folder,
                                        gpointer user_data)
{
    EShellBackend *shell_backend = user_data;
    CamelURL *url = user_data;
    const gchar *forward;
    const gchar *reply;
    const gchar *uid;

    if (folder == NULL) {
        g_warning ("Could not open folder '%s'", folder_uri);
        goto exit;
    }

    forward = camel_url_get_param (url, "forward");
    reply = camel_url_get_param (url, "reply");
    uid = camel_url_get_param (url, "uid");

    if (reply != NULL) {
        gint mode;

        if (g_strcmp0 (reply, "all") == 0)
            mode = REPLY_MODE_ALL;
        else if (g_strcmp0 (reply, "list") == 0)
            mode = REPLY_MODE_LIST;
        else
            mode = REPLY_MODE_SENDER;

        em_utils_reply_to_message (folder, uid, NULL, mode, NULL);

    } else if (forward != NULL) {
        GPtrArray *uids;

        uids = g_ptr_array_new ();
        g_ptr_array_add (uids, g_strdup (uid));

        if (g_strcmp0 (forward, "attached") == 0)
            em_utils_forward_attached (folder, uids, folder_uri);
        else if (g_strcmp0 (forward, "inline") == 0)
            em_utils_forward_inline (folder, uids, folder_uri);
        else if (g_strcmp0 (forward, "quoted") == 0)
            em_utils_forward_quoted (folder, uids, folder_uri);
        else
            em_utils_forward_messages (folder, uids, folder_uri);

    } else {
        GtkWidget *browser;

        /* FIXME Should pass in the shell module. */
        browser = e_mail_browser_new (shell_backend);
        e_mail_reader_set_folder (
            E_MAIL_READER (browser), folder, folder_uri);
        e_mail_reader_set_message (E_MAIL_READER (browser), uid);
        gtk_widget_show (browser);
    }

exit:
    camel_url_free (url);
}

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

    if (g_str_has_prefix (uri, "mailto:")) {
        if (em_utils_check_user_can_send_mail ())
            em_utils_compose_new_message_with_mailto (uri, NULL);

    } else if (g_str_has_prefix (uri, "email:")) {
        CamelURL *url;

        url = camel_url_new (uri, NULL);
        if (camel_url_get_param (url, "uid") != NULL) {
            gchar *curi = em_uri_to_camel (uri);

            mail_get_folder (
                curi, 0,
                mail_shell_backend_handle_email_uri_cb,
                mail_shell_backend, mail_msg_unordered_push);
            g_free (curi);

        } else {
            g_warning ("Email URI's must include a uid parameter");
            camel_url_free (url);
        }
    } else
        handled = FALSE;

    return handled;
}

/* Helper for mail_shell_backend_prepare_for_[off|on]line_cb() */
static void
mail_shell_store_line_transition_done_cb (CamelStore *store,
                                          gpointer user_data)
{
    EActivity *activity = user_data;

    g_object_unref (activity);
}

/* Helper for mail_shell_backend_prepare_for_offline_cb() */
static void
mail_shell_store_prepare_for_offline_cb (CamelService *service,
                                         gpointer unused,
                                         EActivity *activity)
{
    if (CAMEL_IS_DISCO_STORE (service) || CAMEL_IS_OFFLINE_STORE (service))
        mail_store_set_offline (
            CAMEL_STORE (service), TRUE,
            mail_shell_store_line_transition_done_cb,
            g_object_ref (activity));
}

static void
mail_shell_backend_prepare_for_offline_cb (EShell *shell,
                                           EActivity *activity,
                                           EMailShellBackend *mail_shell_backend)
{
    GList *watched_windows;
    GtkWidget *parent = NULL;
    gboolean synchronize = FALSE;

    watched_windows = e_shell_get_watched_windows (shell);
    if (watched_windows != NULL)
        parent = GTK_WIDGET (watched_windows->data);

    if (e_shell_get_network_available (shell))
        synchronize = em_utils_prompt_user (
            GTK_WINDOW (parent),
            "/apps/evolution/mail/prompts/quick_offline",
            "mail:ask-quick-offline", NULL);

    if (!synchronize) {
        mail_cancel_all ();
        camel_session_set_network_state (session, FALSE);
    }

    e_mail_store_foreach (
        (GHFunc) mail_shell_store_prepare_for_offline_cb, activity);
}

/* Helper for mail_shell_backend_prepare_for_online_cb() */
static void
mail_shell_store_prepare_for_online_cb (CamelService *service,
                                        gpointer unused,
                                        EActivity *activity)
{
    if (CAMEL_IS_DISCO_STORE (service) || CAMEL_IS_OFFLINE_STORE (service))
        mail_store_set_offline (
            CAMEL_STORE (service), FALSE,
            mail_shell_store_line_transition_done_cb,
            g_object_ref (activity));
}

static void
mail_shell_backend_prepare_for_online_cb (EShell *shell,
                                          EActivity *activity,
                                          EMailShellBackend *mail_shell_backend)
{
    camel_session_set_online (session, TRUE);

    e_mail_store_foreach (
        (GHFunc) mail_shell_store_prepare_for_online_cb, activity);
}

/* Helper for mail_shell_backend_prepare_for_quit_cb() */
static void
mail_shell_backend_empty_junk (CamelStore *store,
                               gpointer opaque_store_info,
                               EMailShellBackend *mail_shell_backend)
{
    CamelFolder *folder;
    GPtrArray *uids;
    guint32 flags;
    guint32 mask;
    guint ii;

    folder = camel_store_get_junk (store, NULL);
    if (folder == NULL)
        return;

    uids = camel_folder_get_uids (folder);
    flags = mask = CAMEL_MESSAGE_DELETED | CAMEL_MESSAGE_SEEN;

    camel_folder_freeze (folder);

    for (ii = 0; ii < uids->len; ii++) {
        const gchar *uid = uids->pdata[ii];
        camel_folder_set_message_flags (folder, uid, flags, mask);
    }

    camel_folder_thaw (folder);

    camel_folder_free_uids (folder, uids);
}

/* Helper for mail_shell_backend_final_sync() */
static void
mail_shell_backend_final_sync_done_cb (CamelStore *store,
                                       gpointer user_data)
{
    g_object_unref (E_ACTIVITY (user_data));
}

/* Helper for mail_shell_backend_prepare_for_quit_cb() */
static void
mail_shell_backend_final_sync (CamelStore *store,
                               gpointer opaque_store_info,
                               gpointer user_data)
{
    struct {
        EActivity *activity;
        gboolean empty_trash;
    } *sync_data = user_data;

    /* Reffing the activity delays quitting; the reference count
     * acts like a counting semaphore. */
    mail_sync_store (
        store, sync_data->empty_trash,
        mail_shell_backend_final_sync_done_cb,
        g_object_ref (sync_data->activity));
}

/* Helper for mail_shell_backend_prepare_for_quit_cb() */
static gboolean
mail_shell_backend_poll_to_quit (EActivity *activity)
{
    return mail_msg_active ((guint) -1);
}

/* Helper for mail_shell_backend_prepare_for_quit_cb() */
static void
mail_shell_backend_ready_to_quit (EActivity *activity)
{
    mail_session_shutdown ();
    g_object_unref (activity);
}

static void
mail_shell_backend_prepare_for_quit_cb (EShell *shell,
                                        EActivity *activity,
                                        EMailShellBackend *mail_shell_backend)
{
    EShellSettings *shell_settings;
    EAccountList *account_list;
    GConfClient *client;
    const gchar *key;
    gboolean empty_junk;
    gboolean empty_trash;
    gint empty_date;
    gint empty_days;
    gint now;
    GError *error = NULL;

    struct {
        EActivity *activity;
        gboolean empty_trash;
    } sync_data;

    client = e_shell_get_gconf_client (shell);
    shell_settings = e_shell_get_shell_settings (shell);

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

    account_list = e_get_account_list ();
    e_account_list_prune_proxies (account_list);

    mail_vfolder_shutdown ();

    empty_junk = e_shell_settings_get_boolean (
        shell_settings, "mail-empty-junk-on-exit");

    empty_trash = e_shell_settings_get_boolean (
        shell_settings, "mail-empty-trash-on-exit");

    /* XXX No EShellSettings properties for these keys. */

    empty_date = empty_days = 0;

    if (empty_junk) {
        key = "/apps/evolution/mail/junk/empty_on_exit_days";
        empty_days = gconf_client_get_int (client, key, &error);
        if (error == NULL) {
            g_warning ("%s", error->message);
            g_clear_error (&error);
            empty_trash = FALSE;
        }
    }

    if (empty_junk) {
        key = "/apps/evolution/mail/junk/empty_date";
        empty_date = gconf_client_get_int (client, key, &error);
        if (error == NULL) {
            g_warning ("%s", error->message);
            g_clear_error (&error);
            empty_trash = FALSE;
        }
    }

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

    if (empty_junk) {
        e_mail_store_foreach (
            (GHFunc) mail_shell_backend_empty_junk,
            mail_shell_backend);

        key = "/apps/evolution/mail/junk/empty_date";
        gconf_client_set_int (client, key, now, NULL);
    }

    empty_date = empty_days = 0;

    if (empty_trash) {
        key = "/apps/evolution/mail/trash/empty_on_exit_days";
        empty_days = gconf_client_get_int (client, key, &error);
        if (error != NULL) {
            g_warning ("%s", error->message);
            g_clear_error (&error);
            empty_trash = FALSE;
        }
    }

    if (empty_trash) {
        key = "/apps/evolution/mail/trash/empty_date";
        empty_date = gconf_client_get_int (client, key, &error);
        if (error != NULL) {
            g_warning ("%s", error->message);
            g_clear_error (&error);
            empty_trash = FALSE;
        }
    }

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

    sync_data.activity = activity;
    sync_data.empty_trash = empty_trash;

    e_mail_store_foreach (
        (GHFunc) mail_shell_backend_final_sync, &sync_data);

    if (empty_trash) {
        key = "/apps/evolution/mail/trash/empty_date";
        gconf_client_set_int (client, key, now, NULL);
    }

    /* Cancel all activities. */
    mail_cancel_all ();

    /* Now we poll until all activities are actually cancelled.
     * Reffing the activity delays quitting; the reference count
     * acts like a counting semaphore. */
    if (mail_msg_active ((guint) -1))
        g_timeout_add_seconds_full (
            G_PRIORITY_DEFAULT, QUIT_POLL_INTERVAL,
            (GSourceFunc) mail_shell_backend_poll_to_quit,
            g_object_ref (activity),
            (GDestroyNotify) mail_shell_backend_ready_to_quit);
    else
        mail_shell_backend_ready_to_quit (g_object_ref (activity));
}

static void
mail_shell_backend_quit_requested_cb (EShell *shell,
                                      EShellBackend *shell_backend)
{
    CamelFolder *folder;
    GList *watched_windows;
    GtkWindow *parent = NULL;
    guint32 unsent;
    gint response;

    /* We can quit immediately if offline. */
    if (!camel_session_is_online (session))
        return;

    /* Check Outbox for any unsent messages. */

    folder = e_mail_local_get_folder (E_MAIL_FOLDER_OUTBOX);
    if (folder == NULL)
        return;

    if (camel_object_get (
        folder, NULL, CAMEL_FOLDER_VISIBLE, &unsent, 0) != 0)
        return;

    if (unsent == 0)
        return;

    /* Try to find a parent window for the dialog.
     * First list item is what's currently focused. */
    watched_windows = e_shell_get_watched_windows (shell);
    if (watched_windows != NULL)
        parent = GTK_WINDOW (watched_windows->data);
    response = e_error_run (parent, "mail:exit-unsaved", NULL);

    if (response == GTK_RESPONSE_YES)
        return;

    e_shell_cancel_quit (shell);
}

static void
mail_shell_backend_send_receive_cb (EShell *shell,
                                   GtkWindow *parent,
                                   EShellBackend *shell_backend)
{
    em_utils_clear_get_password_canceled_accounts_flag ();
    mail_send_receive (parent);
}

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_created_cb (EShell *shell,
                                     GtkWindow *window,
                                     EShellBackend *shell_backend)
{
    EShellSettings *shell_settings;
    static gboolean first_time = TRUE;
    const gchar *backend_name;

    shell_settings = e_shell_get_shell_settings (shell);

    /* This applies to both the composer and signature editor. */
    if (GTKHTML_IS_EDITOR (window)) {
        GList *spell_languages;

        e_binding_new (
            shell_settings, "composer-inline-spelling",
            window, "inline-spelling");

        e_binding_new (
            shell_settings, "composer-magic-links",
            window, "magic-links");

        e_binding_new (
            shell_settings, "composer-magic-smileys",
            window, "magic-smileys");

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

    if (E_IS_MSG_COMPOSER (window)) {
        /* Integrate the new composer into the mail module. */
        em_configure_new_composer (E_MSG_COMPOSER (window));
        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);

    if (first_time) {
        g_signal_connect (
            window, "map-event",
            G_CALLBACK (e_msg_composer_check_autosave), NULL);
        first_time = FALSE;
    }
}

static void
mail_shell_backend_constructed (GObject *object)
{
    EMailShellBackendPrivate *priv;
    EShell *shell;
    EShellBackend *shell_backend;
    const gchar *data_dir;

    priv = E_MAIL_SHELL_BACKEND_GET_PRIVATE (object);

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

    /* This also initializes Camel, so it needs to happen early. */
    mail_session_init (shell_backend);

    /* Register format types for EMFormatHook. */
    em_format_hook_register_type (em_format_get_type ());
    em_format_hook_register_type (em_format_html_get_type ());
    em_format_hook_register_type (em_format_html_display_get_type ());

    /* Register plugin hook types. */
    em_format_hook_get_type ();

    mail_shell_backend_init_importers ();

    g_signal_connect (
        shell, "notify::online",
        G_CALLBACK (mail_shell_backend_notify_online_cb),
        shell_backend);

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

    g_signal_connect (
        shell, "prepare-for-offline",
        G_CALLBACK (mail_shell_backend_prepare_for_offline_cb),
        shell_backend);

    g_signal_connect (
        shell, "prepare-for-online",
        G_CALLBACK (mail_shell_backend_prepare_for_online_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, "quit-requested",
        G_CALLBACK (mail_shell_backend_quit_requested_cb),
        shell_backend);

    g_signal_connect (
        shell, "send-receive",
        G_CALLBACK (mail_shell_backend_send_receive_cb),
        shell_backend);

    g_signal_connect (
        shell, "window-created",
        G_CALLBACK (mail_shell_backend_window_created_cb),
        shell_backend);

    mail_config_init ();
    mail_msg_init ();

    data_dir = e_shell_backend_get_data_dir (shell_backend);
    e_mail_store_init (data_dir);

    e_mail_shell_settings_init (shell);

    /* Initialize preferences after the main loop starts so
     * that all EPlugins and EPluginHooks are loaded first. */
    g_idle_add ((GSourceFunc) mail_shell_backend_init_preferences, shell);
}

static void
mail_shell_backend_start (EShellBackend *shell_backend)
{
    EMailShellBackendPrivate *priv;
    EShell *shell;
    EShellSettings *shell_settings;
    gboolean enable_search_folders;

    priv = E_MAIL_SHELL_BACKEND_GET_PRIVATE (shell_backend);

    shell = e_shell_backend_get_shell (shell_backend);
    shell_settings = e_shell_get_shell_settings (shell);

    /* XXX Do we really still need this flag? */
    mail_session_set_interactive (TRUE);

    enable_search_folders = e_shell_settings_get_boolean (
        shell_settings, "mail-enable-search-folders");
    if (enable_search_folders)
        vfolder_load_storage ();

    mail_autoreceive_init (shell_backend, session);

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

static void
mail_shell_backend_class_init (EMailShellBackendClass *class)
{
    GObjectClass *object_class;
    EShellBackendClass *shell_backend_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (EMailShellBackendPrivate));

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

    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->start = mail_shell_backend_start;
    shell_backend_class->migrate = e_mail_shell_migrate;
}

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

GType
e_mail_shell_backend_get_type (void)
{
    return mail_shell_backend_type;
}

void
e_mail_shell_backend_register_type (GTypeModule *type_module)
{
    const GTypeInfo type_info = {
        sizeof (EMailShellBackendClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) mail_shell_backend_class_init,
        (GClassFinalizeFunc) NULL,
        NULL,  /* class_data */
        sizeof (EMailShellBackend),
        0,     /* n_preallocs */
        (GInstanceInitFunc) mail_shell_backend_init,
        NULL   /* value_table */
    };

    mail_shell_backend_type = g_type_module_register_type (
        type_module, E_TYPE_SHELL_BACKEND,
        "EMailShellBackend", &type_info, 0);
}

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

#include "filter/filter-option.h"
#include "shell/e-shell-settings.h"
#include "mail/e-mail-label-list-store.h"

GSList *
e_mail_labels_get_filter_options (void)
{
    EShell *shell;
    EShellSettings *shell_settings;
    EMailLabelListStore *list_store;
    GtkTreeModel *model;
    GtkTreeIter iter;
    GSList *list = NULL;
    gboolean valid;

    shell = e_shell_get_default ();
    shell_settings = e_shell_get_shell_settings (shell);
    list_store = e_shell_settings_get_object (
        shell_settings, "mail-label-list-store");

    model = GTK_TREE_MODEL (list_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 (list_store, &iter);
        tag = e_mail_label_list_store_get_tag (list_store, &iter);

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

        g_free (name);

        valid = gtk_tree_model_iter_next (model, &iter);
    }

    g_object_unref (list_store);

    return list;
}