Radically reorganize source code.

- Collect all shell modules into a new top-level 'modules' directory:

      $(top_srcdir)/modules/addressbook
      $(top_srcdir)/modules/calendar
      $(top_srcdir)/modules/mail

  Nothing is allowed to link to these, not plugins nor other modules.

  THIS SOLVES BUG #571275 AND OPENS THE DOOR TO PORTING TO MAC OS X.

- Mimic the libevolution-mail-shared library from master (except drop
  the "shared" suffix) and have libevolution-mail-importers and all
  mail-related plugins link to it.

- Discard the a11y subdirectories and have the files live alongside
  their counterpart widgets.

1 files changed, 787 insertions, 0 deletions

diff --git a/modules/mail/e-mail-shell-backend.c b/modules/mail/e-mail-shell-backend.c
new file mode 100644
index 0000000000..3dcb7b1391
--- /dev/null
+++ b/modules/mail/e-mail-shell-backend.c
@@ -0,0 +1,787 @@
+/*
+ * 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-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-attachment-handler-mail.h"
+#include "e-mail-browser.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-config.h"
+#include "em-event.h"
+#include "em-folder-utils.h"
+#include "em-format-hook.h"
+#include "em-format-html-display.h"
+#include "em-junk-hook.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"
+
+struct _EMailShellBackendPrivate {
+	gint mail_sync_in_progress;
+	guint mail_sync_timeout_source_id;
+};
+
+static gpointer parent_class;
+static GType mail_shell_backend_type;
+
+/* XXX So many things need the shell backend that it's
+ *     just easier for now to make it globally available.
+ *     We should fix this, though. */
+EMailShellBackend *global_mail_shell_backend = NULL;
+
+extern gint camel_application_is_exiting;
+
+static gboolean
+mail_shell_backend_run_account_druid (GtkWindow *parent)
+{
+	EAccountList *account_list;
+	EMAccountEditor *account_editor;
+
+	account_editor = em_account_editor_new (
+		NULL, EMAE_DRUID,
+		"org.gnome.evolution.mail.config.accountDruid");
+	if (GTK_IS_WINDOW (parent))
+		gtk_window_set_transient_for (
+			GTK_WINDOW (account_editor->editor), parent);
+	g_object_weak_ref (
+		G_OBJECT (account_editor->editor),
+		(GWeakNotify) gtk_main_quit, NULL);
+	gtk_widget_show (account_editor->editor);
+	gtk_grab_add (account_editor->editor);
+	gtk_main ();
+
+	account_list = e_get_account_list ();
+
+	return (e_list_length ((EList *) account_list) > 0);
+}
+
+static void
+mail_shell_backend_init_hooks (void)
+{
+	e_plugin_hook_register_type (em_config_hook_get_type ());
+	e_plugin_hook_register_type (em_event_hook_get_type ());
+	e_plugin_hook_register_type (em_junk_hook_get_type ());
+
+	/* EMFormat classes must be registered before 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 ());
+	e_plugin_hook_register_type (em_format_hook_get_type ());
+
+	em_junk_hook_register_type (emj_get_type ());
+}
+
+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 void
+mail_shell_backend_init_preferences (EShell *shell)
+{
+	EAccountList *account_list;
+	GtkWidget *preferences_window;
+
+	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);
+}
+
+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, FALSE);
+		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 TRUE;
+}
+
+/* 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);
+}
+
+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 (
+			G_OBJECT (shell_settings), "composer-inline-spelling",
+			G_OBJECT (window), "inline-spelling");
+
+		e_binding_new (
+			G_OBJECT (shell_settings), "composer-magic-links",
+			G_OBJECT (window), "magic-links");
+
+		e_binding_new (
+			G_OBJECT (shell_settings), "composer-magic-smileys",
+			G_OBJECT (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);
+
+	mail_shell_backend_init_hooks ();
+	mail_shell_backend_init_importers ();
+
+	e_attachment_handler_mail_get_type ();
+
+	/* XXX This never gets unreffed. */
+	global_mail_shell_backend = g_object_ref (shell_backend);
+
+	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, "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);
+
+	/* Initialize settings before initializing preferences,
+	 * since the preferences bind to the shell settings. */
+	e_mail_shell_settings_init (shell);
+	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->is_busy = NULL;
+	shell_backend_class->shutdown = NULL;
+	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;
+}