path: root/shell/e-shell.c

/*
 * e-shell.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-shell.h"

#include <glib/gi18n.h>
#include <libedataserverui/e-passwords.h>

#include "e-util/e-util.h"
#include "widgets/misc/e-preferences-window.h"

#include "e-shell-migrate.h"
#include "e-shell-module.h"
#include "e-shell-window.h"

#define SHUTDOWN_TIMEOUT    500  /* milliseconds */

#define E_SHELL_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_SHELL, EShellPrivate))

struct _EShellPrivate {
    GList *watched_windows;
    EShellSettings *settings;
    GConfClient *gconf_client;
    GtkWidget *preferences_window;

    /* Shell Modules */
    GList *loaded_modules;
    GHashTable *modules_by_name;
    GHashTable *modules_by_scheme;

    gpointer preparing_for_line_change;  /* weak pointer */

    guint auto_reconnect    : 1;
    guint network_available : 1;
    guint online        : 1;
    guint safe_mode     : 1;
};

enum {
    PROP_0,
    PROP_NETWORK_AVAILABLE,
    PROP_ONLINE,
    PROP_SHELL_SETTINGS
};

enum {
    EVENT,
    HANDLE_URI,
    PREPARE_FOR_OFFLINE,
    PREPARE_FOR_ONLINE,
    SEND_RECEIVE,
    WINDOW_CREATED,
    WINDOW_DESTROYED,
    LAST_SIGNAL
};

enum {
    DEBUG_KEY_SETTINGS = 1 << 0
};

static GDebugKey debug_keys[] = {
    { "settings",   DEBUG_KEY_SETTINGS }
};

EShell *default_shell = NULL;
static gpointer parent_class;
static guint signals[LAST_SIGNAL];

#if NM_SUPPORT
void e_shell_dbus_initialize (EShell *shell);
#endif

static void
shell_parse_debug_string (EShell *shell)
{
    guint flags;

    flags = g_parse_debug_string (
        g_getenv ("EVOLUTION_DEBUG"),
        debug_keys, G_N_ELEMENTS (debug_keys));

    if (flags & DEBUG_KEY_SETTINGS)
        e_shell_settings_enable_debug (shell->priv->settings);
}

static void
shell_notify_online_cb (EShell *shell)
{
    gboolean online;

    online = e_shell_get_online (shell);
    e_passwords_set_online (online);
}

static gboolean
shell_window_delete_event_cb (EShell *shell,
                              GtkWindow *window)
{
    /* If other windows are open we can safely close this one. */
    if (g_list_length (shell->priv->watched_windows) > 1)
        return FALSE;

    /* Otherwise we initiate application shutdown. */
    return !e_shell_quit (shell);
}

static gboolean
shell_window_focus_in_event_cb (EShell *shell,
                                GdkEventFocus *event,
                                GtkWindow *window)
{
    GList *list, *link;

    /* Keep the watched windows list sorted by most recently focused,
     * so the first item in the list should always be the currently
     * focused window. */

    list = shell->priv->watched_windows;
    link = g_list_find (list, window);
    g_return_val_if_fail (link != NULL, FALSE);

    if (link != list) {
        list = g_list_remove_link (list, link);
        list = g_list_concat (link, list);
    }

    shell->priv->watched_windows = list;

    return FALSE;
}

static void
shell_window_weak_notify_cb (EShell *shell,
                             GObject *where_the_object_was)
{
    GList *list;

    list = shell->priv->watched_windows;
    list = g_list_remove (list, where_the_object_was);
    shell->priv->watched_windows = list;

    g_signal_emit (shell, signals[WINDOW_DESTROYED], 0);
}

static void
shell_ready_for_offline (EShell *shell,
                         EActivity *activity,
                         gboolean is_last_ref)
{
    if (!is_last_ref)
        return;

    e_activity_complete (activity);

    g_object_remove_toggle_ref (
        G_OBJECT (activity), (GToggleNotify)
        shell_ready_for_offline, shell);

    shell->priv->online = FALSE;
    g_object_notify (G_OBJECT (shell), "online");

    g_message ("Offline preparations complete.");
}

static void
shell_prepare_for_offline (EShell *shell)
{
    /* Are preparations already in progress? */
    if (shell->priv->preparing_for_line_change != NULL)
        return;

    g_message ("Preparing for offline mode...");

    shell->priv->preparing_for_line_change =
        e_activity_new (_("Preparing to go offline..."));

    g_object_add_toggle_ref (
        G_OBJECT (shell->priv->preparing_for_line_change),
        (GToggleNotify) shell_ready_for_offline, shell);

    g_object_add_weak_pointer (
        G_OBJECT (shell->priv->preparing_for_line_change),
        &shell->priv->preparing_for_line_change);

    g_signal_emit (
        shell, signals[PREPARE_FOR_OFFLINE], 0,
        shell->priv->preparing_for_line_change);

    g_object_unref (shell->priv->preparing_for_line_change);
}

static void
shell_ready_for_online (EShell *shell,
                        EActivity *activity,
                        gboolean is_last_ref)
{
    if (!is_last_ref)
        return;

    e_activity_complete (activity);

    g_object_remove_toggle_ref (
        G_OBJECT (activity), (GToggleNotify)
        shell_ready_for_online, shell);

    shell->priv->online = TRUE;
    g_object_notify (G_OBJECT (shell), "online");

    g_message ("Online preparations complete.");
}

static void
shell_prepare_for_online (EShell *shell)
{
    /* Are preparations already in progress? */
    if (shell->priv->preparing_for_line_change != NULL)
        return;

    g_message ("Preparing for online mode...");

    shell->priv->preparing_for_line_change =
        e_activity_new (_("Preparing to go online..."));

    g_object_add_toggle_ref (
        G_OBJECT (shell->priv->preparing_for_line_change),
        (GToggleNotify) shell_ready_for_online, shell);

    g_object_add_weak_pointer (
        G_OBJECT (shell->priv->preparing_for_line_change),
        &shell->priv->preparing_for_line_change);

    g_signal_emit (
        shell, signals[PREPARE_FOR_ONLINE], 0,
        shell->priv->preparing_for_line_change);

    g_object_unref (shell->priv->preparing_for_line_change);
}

/* Helper for shell_query_module() */
static void
shell_split_and_insert_items (GHashTable *hash_table,
                              const gchar *items,
                              EShellModule *shell_module)
{
    gpointer key;
    gchar **strv;
    gint ii;

    strv = g_strsplit_set (items, ":", -1);

    for (ii = 0; strv[ii] != NULL; ii++) {
        key = (gpointer) g_intern_string (strv[ii]);
        g_hash_table_insert (hash_table, key, shell_module);
    }

    g_strfreev (strv);
}

static void
shell_query_module (EShell *shell,
                    const gchar *filename)
{
    EShellModule *shell_module;
    EShellModuleInfo *info;
    GHashTable *modules_by_name;
    GHashTable *modules_by_scheme;
    const gchar *string;

    shell_module = e_shell_module_new (shell, filename);

    if (!g_type_module_use (G_TYPE_MODULE (shell_module))) {
        g_critical ("Failed to load module: %s", filename);
        g_object_unref (shell_module);
        return;
    }

    shell->priv->loaded_modules = g_list_insert_sorted (
        shell->priv->loaded_modules, shell_module,
        (GCompareFunc) e_shell_module_compare);

    /* Bookkeeping */

    info = (EShellModuleInfo *) shell_module->priv;
    modules_by_name = shell->priv->modules_by_name;
    modules_by_scheme = shell->priv->modules_by_scheme;

    if ((string = info->name) != NULL)
        g_hash_table_insert (
            modules_by_name, (gpointer)
            g_intern_string (string), shell_module);

    if ((string = info->aliases) != NULL)
        shell_split_and_insert_items (
            modules_by_name, string, shell_module);

    if ((string = info->schemes) != NULL)
        shell_split_and_insert_items (
            modules_by_scheme, string, shell_module);
}

static void
shell_load_modules (EShell *shell)
{
    GDir *dir;
    const gchar *dirname;
    const gchar *basename;
    GError *error = NULL;

    dirname = EVOLUTION_MODULEDIR;

    dir = g_dir_open (dirname, 0, &error);
    if (dir == NULL) {
        g_critical ("%s", error->message);
        g_error_free (error);
        return;
    }

    while ((basename = g_dir_read_name (dir)) != NULL) {
        gchar *filename;

        if (!g_str_has_suffix (basename, "." G_MODULE_SUFFIX))
            continue;

        filename = g_build_filename (dirname, basename, NULL);
        shell_query_module (shell, filename);
        g_free (filename);
    }

    g_dir_close (dir);
}

static gboolean
shell_shutdown_timeout (EShell *shell)
{
    GList *list, *iter;
    gboolean proceed = TRUE;
    static guint source_id = 0;
    static guint message_timer = 1;

    /* Module list is read-only; do not free. */
    list = e_shell_get_shell_modules (shell);

    /* Any module can defer shutdown if it's still busy. */
    for (iter = list; proceed && iter != NULL; iter = iter->next) {
        EShellModule *shell_module = iter->data;
        proceed = e_shell_module_shutdown (shell_module);

        /* Emit a message every few seconds to indicate
         * which module(s) we're still waiting on. */
        if (proceed || message_timer == 0)
            continue;

        g_message (
            _("Waiting for the \"%s\" module to finish..."),
            G_TYPE_MODULE (shell_module)->name);
    }

    message_timer = (message_timer + 1) % 10;

    /* If we're go for shutdown, destroy all shell windows.  Note,
     * we iterate over a /copy/ of the active windows list because
     * the act of destroying a shell window will modify the active
     * windows list, which would otherwise derail the iteration. */
    if (proceed) {
        list = g_list_copy (shell->priv->watched_windows);
        g_list_foreach (list, (GFunc) gtk_widget_destroy, NULL);
        g_list_free (list);

    /* If a module is still busy, try again after a short delay. */
    } else if (source_id == 0)
        source_id = g_timeout_add (
            SHUTDOWN_TIMEOUT, (GSourceFunc)
            shell_shutdown_timeout, shell);

    /* Return TRUE to repeat the timeout, FALSE to stop it.  This
     * may seem backwards if the function was called directly. */
    return !proceed;
}

static void
shell_set_property (GObject *object,
                    guint property_id,
                    const GValue *value,
                    GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_NETWORK_AVAILABLE:
            e_shell_set_network_available (
                E_SHELL (object),
                g_value_get_boolean (value));
            return;

        case PROP_ONLINE:
            e_shell_set_online (
                E_SHELL (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_get_property (GObject *object,
                    guint property_id,
                    GValue *value,
                    GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_NETWORK_AVAILABLE:
            g_value_set_boolean (
                value, e_shell_get_network_available (
                E_SHELL (object)));
            return;

        case PROP_ONLINE:
            g_value_set_boolean (
                value, e_shell_get_online (
                E_SHELL (object)));
            return;

        case PROP_SHELL_SETTINGS:
            g_value_set_object (
                value, e_shell_get_shell_settings (
                E_SHELL (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_dispose (GObject *object)
{
    EShellPrivate *priv;

    priv = E_SHELL_GET_PRIVATE (object);

    if (priv->settings != NULL) {
        g_object_unref (priv->settings);
        priv->settings = NULL;
    }

    if (priv->gconf_client != NULL) {
        g_object_unref (priv->gconf_client);
        priv->gconf_client = NULL;
    }

    if (priv->preferences_window != NULL) {
        g_object_unref (priv->preferences_window);
        priv->preferences_window = NULL;
    }

    g_list_foreach (
        priv->loaded_modules,
        (GFunc) g_type_module_unuse, NULL);
    g_list_free (priv->loaded_modules);
    priv->loaded_modules = NULL;

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

static void
shell_finalize (GObject *object)
{
    EShellPrivate *priv;

    priv = E_SHELL_GET_PRIVATE (object);

    g_hash_table_destroy (priv->modules_by_name);
    g_hash_table_destroy (priv->modules_by_scheme);

    /* Indicates a clean shut down to the next session. */
    if (!unique_app_is_running (UNIQUE_APP (object)))
        e_file_lock_destroy ();

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

static void
shell_constructed (GObject *object)
{
    /* UniqueApp will have by this point determined whether we're
     * the only Evolution process running.  If so, proceed normally.
     * Otherwise we just issue commands to the other process. */
    if (unique_app_is_running (UNIQUE_APP (object)))
        return;

    e_file_lock_create ();

    shell_load_modules (E_SHELL (object));
    e_shell_migrate_attempt (E_SHELL (object));
}

static gboolean
shell_message_handle_new (EShell *shell,
                          UniqueMessageData *data)
{
    gchar *view_name;

    view_name = unique_message_data_get_text (data);
    e_shell_create_shell_window (shell, view_name);
    g_free (view_name);

    return TRUE;
}

static gboolean
shell_message_handle_open (EShell *shell,
                           UniqueMessageData *data)
{
    gchar **uris;

    uris = unique_message_data_get_uris (data);
    e_shell_handle_uris (shell, uris);
    g_strfreev (uris);

    return TRUE;
}

static gboolean
shell_message_handle_close (EShell *shell,
                            UniqueMessageData *data)
{
    e_shell_quit (shell);

    return TRUE;
}

static UniqueResponse
shell_message_received (UniqueApp *app,
                        gint command,
                        UniqueMessageData *data,
                        guint time_)
{
    EShell *shell = E_SHELL (app);

    switch (command) {
        case UNIQUE_ACTIVATE:
            break;  /* use the default behavior */

        case UNIQUE_NEW:
            if (shell_message_handle_new (shell, data))
                return UNIQUE_RESPONSE_OK;
            break;

        case UNIQUE_OPEN:
            if (shell_message_handle_open (shell, data))
                return UNIQUE_RESPONSE_OK;
            break;

        case UNIQUE_CLOSE:
            if (shell_message_handle_close (shell, data))
                return UNIQUE_RESPONSE_OK;
            break;

        default:
            break;
    }

    /* Chain up to parent's message_received() method. */
    return UNIQUE_APP_CLASS (parent_class)->
        message_received (app, command, data, time_);
}

static void
shell_class_init (EShellClass *class)
{
    GObjectClass *object_class;
    UniqueAppClass *unique_app_class;

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

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = shell_set_property;
    object_class->get_property = shell_get_property;
    object_class->dispose = shell_dispose;
    object_class->finalize = shell_finalize;
    object_class->constructed = shell_constructed;

    unique_app_class = UNIQUE_APP_CLASS (class);
    unique_app_class->message_received = shell_message_received;

    /**
     * EShell:network-available
     *
     * Whether the network is available.
     **/
    g_object_class_install_property (
        object_class,
        PROP_NETWORK_AVAILABLE,
        g_param_spec_boolean (
            "network-available",
            _("Network Available"),
            _("Whether the network is available"),
            TRUE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    /**
     * EShell:online
     *
     * Whether the shell is online.
     **/
    g_object_class_install_property (
        object_class,
        PROP_ONLINE,
        g_param_spec_boolean (
            "online",
            _("Online"),
            _("Whether the shell is online"),
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    /**
     * EShell:settings
     *
     * The #EShellSettings object stores application settings.
     **/
    g_object_class_install_property (
        object_class,
        PROP_SHELL_SETTINGS,
        g_param_spec_object (
            "shell-settings",
            _("Shell Settings"),
            _("Application-wide settings"),
            E_TYPE_SHELL_SETTINGS,
            G_PARAM_READABLE));

    /**
     * EShell::event
     * @shell: the #EShell which emitted the signal
     * @event_data: data associated with the event
     *
     * This signal is used to broadcast custom events to the entire
     * application.  The nature of @event_data depends on the event
     * being broadcast.  The signal's detail denotes the event.
     **/
    signals[EVENT] = g_signal_new (
        "event",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST | G_SIGNAL_DETAILED | G_SIGNAL_ACTION,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__POINTER,
        G_TYPE_NONE, 1,
        G_TYPE_POINTER);

    /**
     * EShell::handle-uri
     * @shell: the #EShell which emitted the signal
     * @uri: the URI to be handled
     *
     * Emitted when @shell receives a URI to be handled, usually by
     * way of a command-line argument.  An #EShellModule should listen
     * for this signal and try to handle the URI, usually by opening an
     * editor window for the identified resource.
     *
     * Returns: %TRUE if the URI could be handled, %FALSE otherwise
     **/
    signals[HANDLE_URI] = g_signal_new (
        "handle-uri",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
        0, g_signal_accumulator_true_handled, NULL,
        e_marshal_BOOLEAN__STRING,
        G_TYPE_BOOLEAN, 1,
        G_TYPE_STRING);

    /**
     * EShell::prepare-for-offline
     * @shell: the #EShell which emitted the signal
     * @activity: the #EActivity for offline preparations
     *
     * Emitted when the user elects to work offline.  An #EShellModule
     * should listen for this signal and make preparations for working
     * in offline mode.
     *
     * If preparations for working offline cannot immediately be
     * completed (such as when synchronizing with a remote server),
     * the #EShellModule should reference the @activity until
     * preparations are complete, and then unreference the @activity.
     * This will delay Evolution from actually going to offline mode
     * until all modules have unreferenced @activity.
     **/
    signals[PREPARE_FOR_OFFLINE] = g_signal_new (
        "prepare-for-offline",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_ACTIVITY);

    /**
     * EShell::prepare-for-online
     * @shell: the #EShell which emitted the signal
     * @activity: the #EActivity for offline preparations
     *
     * Emitted when the user elects to work online.  An #EShellModule
     * should listen for this signal and make preparations for working
     * in online mode.
     *
     * If preparations for working online cannot immediately be
     * completed (such as when re-connecting to a remote server), the
     * #EShellModule should reference the @activity until preparations
     * are complete, and then unreference the @activity.  This will
     * delay Evolution from actually going to online mode until all
     * modules have unreferenced @activity.
     **/
    signals[PREPARE_FOR_ONLINE] = g_signal_new (
        "prepare-for-online",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_FIRST,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_ACTIVITY);

    /**
     * EShell::send-receive
     * @shell: the #EShell which emitted the signal
     * @parent: a parent #GtkWindow
     *
     * Emitted when the user chooses the "Send / Receive" action.
     * The parent window can be used for showing transient windows.
     **/
    signals[SEND_RECEIVE] = g_signal_new (
        "send-receive",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        GTK_TYPE_WINDOW);

    /**
     * EShell::window-created
     * @shell: the #EShell which emitted the signal
     * @window: the newly created #GtkWindow
     *
     * Emitted when @shell begins watching a newly created window.
     **/
    signals[WINDOW_CREATED] = g_signal_new (
        "window-created",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        GTK_TYPE_WINDOW);

    /**
     * EShell::window-destroyed
     * @shell: the #EShell which emitted the signal
     *
     * Emitted when a watched is destroyed.
     **/
    signals[WINDOW_DESTROYED] = g_signal_new (
        "window-destroyed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        0, NULL, NULL,
        g_cclosure_marshal_VOID__VOID,
        G_TYPE_NONE, 0);

    /* Install some desktop-wide settings. */

    e_shell_settings_install_property (
        g_param_spec_boolean (
            "disable-application-handlers",
            NULL,
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    e_shell_settings_install_property (
        g_param_spec_boolean (
            "disable-command-line",
            NULL,
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    e_shell_settings_install_property (
        g_param_spec_boolean (
            "disable-printing",
            NULL,
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    e_shell_settings_install_property (
        g_param_spec_boolean (
            "disable-print-setup",
            NULL,
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    e_shell_settings_install_property (
        g_param_spec_boolean (
            "disable-save-to-disk",
            NULL,
            NULL,
            FALSE,
            G_PARAM_READWRITE));
}

static void
shell_init (EShell *shell)
{
    GHashTable *modules_by_name;
    GHashTable *modules_by_scheme;

    shell->priv = E_SHELL_GET_PRIVATE (shell);

    modules_by_name = g_hash_table_new (g_str_hash, g_str_equal);
    modules_by_scheme = g_hash_table_new (g_str_hash, g_str_equal);

    shell->priv->settings = g_object_new (E_TYPE_SHELL_SETTINGS, NULL);
    shell->priv->gconf_client = gconf_client_get_default ();
    shell->priv->preferences_window = e_preferences_window_new ();
    shell->priv->modules_by_name = modules_by_name;
    shell->priv->modules_by_scheme = modules_by_scheme;
    shell->priv->safe_mode = e_file_lock_exists ();

    g_object_ref_sink (shell->priv->preferences_window);

#if NM_SUPPORT
    e_shell_dbus_initialize (shell);
#endif

    shell_parse_debug_string (shell);

    g_signal_connect (
        shell, "notify::online",
        G_CALLBACK (shell_notify_online_cb), NULL);

    e_shell_settings_bind_to_gconf (
        shell->priv->settings, "disable-application-handlers",
        "/desktop/gnome/lockdown/disable_application_handlers");

    e_shell_settings_bind_to_gconf (
        shell->priv->settings, "disable-command-line",
        "/desktop/gnome/lockdown/disable_command_line");

    e_shell_settings_bind_to_gconf (
        shell->priv->settings, "disable-printing",
        "/desktop/gnome/lockdown/disable_printing");

    e_shell_settings_bind_to_gconf (
        shell->priv->settings, "disable-print-setup",
        "/desktop/gnome/lockdown/disable_print_setup");

    e_shell_settings_bind_to_gconf (
        shell->priv->settings, "disable-save-to-disk",
        "/desktop/gnome/lockdown/disable_save_to_disk");
}

GType
e_shell_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0)) {
        const GTypeInfo type_info = {
            sizeof (EShellClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) shell_class_init,
            (GClassFinalizeFunc) NULL,
            NULL,  /* class_data */
            sizeof (EShell),
            0,     /* n_preallocs */
            (GInstanceInitFunc) shell_init,
            NULL   /* value_table */
        };

        type = g_type_register_static (
            UNIQUE_TYPE_APP, "EShell", &type_info, 0);
    }

    return type;
}

/**
 * e_shell_get_default:
 *
 * Returns the #EShell created by <function>main()</function>.
 *
 * Try to obtain the #EShell from elsewhere if you can.  This function
 * is intended as a temporary workaround for when that proves difficult.
 *
 * Returns: the #EShell singleton
 **/
EShell *
e_shell_get_default (void)
{
    /* Emit a warning if we call this too early. */
    g_return_val_if_fail (default_shell != NULL, NULL);

    return default_shell;
}

/**
 * e_shell_get_shell_modules:
 * @shell: an #EShell
 *
 * Returns a list of loaded #EShellModule instances.  The list is
 * owned by @shell and should not be modified or freed.
 *
 * Returns: a list of loaded #EShellModule instances
 **/
GList *
e_shell_get_shell_modules (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    return shell->priv->loaded_modules;
}

/**
 * e_shell_get_canonical_name:
 * @shell: an #EShell
 * @name: the name or alias of an #EShellModule
 *
 * Returns the canonical name for the #EShellModule whose name or alias
 * is @name.
 *
 * Returns: the canonical #EShellModule name
 **/
const gchar *
e_shell_get_canonical_name (EShell *shell,
                            const gchar *name)
{
    EShellModule *shell_module;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    /* Handle NULL name arguments silently. */
    if (name == NULL)
        return NULL;

    shell_module = e_shell_get_module_by_name (shell, name);

    if (shell_module == NULL)
        return NULL;

    return G_TYPE_MODULE (shell_module)->name;
}

/**
 * e_shell_get_module_by_name:
 * @shell: an #EShell
 * @name: the name or alias of an #EShellModule
 *
 * Returns the corresponding #EShellModule for the given name or alias,
 * or %NULL if @name is not recognized.
 *
 * Returns: the #EShellModule named @name, or %NULL
 **/
EShellModule *
e_shell_get_module_by_name (EShell *shell,
                            const gchar *name)
{
    GHashTable *hash_table;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);
    g_return_val_if_fail (name != NULL, NULL);

    hash_table = shell->priv->modules_by_name;

    return g_hash_table_lookup (hash_table, name);
}

/**
 * e_shell_get_module_by_scheme:
 * @shell: an #EShell
 * @scheme: a URI scheme
 *
 * Returns the #EShellModule that implements the given URI scheme,
 * or %NULL if @scheme is not recognized.
 *
 * Returns: the #EShellModule that implements @scheme, or %NULL
 **/
EShellModule *
e_shell_get_module_by_scheme (EShell *shell,
                              const gchar *scheme)
{
    GHashTable *hash_table;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);
    g_return_val_if_fail (scheme != NULL, NULL);

    hash_table = shell->priv->modules_by_scheme;

    return g_hash_table_lookup (hash_table, scheme);
}
/**
 * e_shell_get_shell_settings:
 * @shell: an #EShell
 *
 * Returns the #EShellSettings instance for @shell.
 *
 * Returns: the #EShellSettings instance for @shell
 **/
EShellSettings *
e_shell_get_shell_settings (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    return shell->priv->settings;
}

/**
 * e_shell_get_gconf_client:
 * @shell: an #EShell
 *
 * Returns the default #GConfClient.  This function is purely for
 * convenience.  The @shell owns the reference so you don't have to.
 *
 * Returns: the default #GConfClient
 **/
GConfClient *
e_shell_get_gconf_client (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    return shell->priv->gconf_client;
}

/**
 * e_shell_create_shell_window:
 * @shell: an #EShell
 * @view_name: name of the initial shell view, or %NULL
 *
 * Creates a new #EShellWindow and emits the #EShell::window-created
 * signal.  Use this function instead of e_shell_window_new() so that
 * @shell can track the window.
 *
 * Returns: a new #EShellWindow
 **/
GtkWidget *
e_shell_create_shell_window (EShell *shell,
                             const gchar *view_name)
{
    GtkWidget *shell_window;
    UniqueMessageData *data;
    UniqueApp *app;

    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    app = UNIQUE_APP (shell);

    if (unique_app_is_running (app))
        goto unique;

    view_name = e_shell_get_canonical_name (shell, view_name);

    /* EShellWindow initializes its active view from a GConf key,
     * so set the key ahead of time to control the intial view. */
    if (view_name != NULL) {
        GConfClient *client;
        const gchar *key;
        GError *error = NULL;

        client = e_shell_get_gconf_client (shell);
        key = "/apps/evolution/shell/view_defaults/component_id";
        gconf_client_set_string (client, key, view_name, &error);

        if (error != NULL) {
            g_warning ("%s", error->message);
            g_error_free (error);
        }
    }

    shell_window = e_shell_window_new (shell, shell->priv->safe_mode);

    gtk_widget_show (shell_window);

    return shell_window;

unique:  /* Send a message to the other Evolution process. */

    /* XXX Do something with UniqueResponse? */

    if (view_name != NULL) {
        data = unique_message_data_new ();
        unique_message_data_set_text (data, view_name, -1);
        unique_app_send_message (app, UNIQUE_NEW, data);
        unique_message_data_free (data);
    } else
        unique_app_send_message (app, UNIQUE_ACTIVATE, NULL);

    return NULL;
}

/**
 * e_shell_handle_uris:
 * @shell: an #EShell
 * @uris: %NULL-terminated list of URIs
 *
 * Emits the #EShell::handle-uri signal for each URI.
 *
 * Returns: the number of URIs successfully handled
 **/
guint
e_shell_handle_uris (EShell *shell,
                     gchar **uris)
{
    UniqueApp *app;
    UniqueMessageData *data;
    guint n_handled = 0;
    gint ii;

    g_return_val_if_fail (E_IS_SHELL (shell), FALSE);
    g_return_val_if_fail (uris != NULL, FALSE);

    app = UNIQUE_APP (shell);

    if (unique_app_is_running (app))
        goto unique;

    for (ii = 0; uris[ii] != NULL; ii++) {
        gboolean handled;

        g_signal_emit (
            shell, signals[HANDLE_URI],
            0, uris[ii], &handled);
        n_handled += handled ? 1 : 0;
    }

    return n_handled;

unique:  /* Send a message to the other Evolution process. */

    /* XXX Do something with UniqueResponse? */

    data = unique_message_data_new ();
    unique_message_data_set_uris (data, uris);
    unique_app_send_message (app, UNIQUE_OPEN, data);
    unique_message_data_free (data);

    return 0;
}

/**
 * e_shell_watch_window:
 * @shell: an #EShell
 * @window: a #GtkWindow
 *
 * Makes @shell "watch" a newly created toplevel window, and emits the
 * #EShell::window-created signal.  All #EShellWindow<!-- -->s should be
 * watched, along with any editor or viewer windows that may be shown in
 * response to e_shell_handle_uris().  When the last watched window is
 * closed, Evolution terminates.
 **/
void
e_shell_watch_window (EShell *shell,
                      GtkWindow *window)
{
    GList *list;

    g_return_if_fail (E_IS_SHELL (shell));
    g_return_if_fail (GTK_IS_WINDOW (window));

    list = shell->priv->watched_windows;

    /* Ignore duplicates. */
    if (g_list_find (list, window) != NULL)
        return;

    list = g_list_prepend (list, window);
    shell->priv->watched_windows = list;

    unique_app_watch_window (UNIQUE_APP (shell), window);

    g_signal_connect_swapped (
        window, "delete-event",
        G_CALLBACK (shell_window_delete_event_cb), shell);

    g_signal_connect_swapped (
        window, "focus-in-event",
        G_CALLBACK (shell_window_focus_in_event_cb), shell);

    g_object_weak_ref (
        G_OBJECT (window), (GWeakNotify)
        shell_window_weak_notify_cb, shell);

    g_signal_emit (shell, signals[WINDOW_CREATED], 0, window);
}

/**
 * e_shell_get_watched_windows:
 * @shell: an #EShell
 *
 * Returns a list of windows being watched by @shell.  The list is sorted
 * by the most recently focused window, such that the first instance is the
 * currently focused window.  (Useful for choosing a parent for a transient
 * window.)  The list is owned by @shell and should not be modified or freed.
 *
 * Returns: a list of watched windows
 **/
GList *
e_shell_get_watched_windows (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    return shell->priv->watched_windows;
}

/**
 * e_shell_send_receive:
 * @shell: an #EShell
 * @parent: the parent #GtkWindow
 *
 * Emits the #EShell::send-receive signal.
 **/
void
e_shell_send_receive (EShell *shell,
                      GtkWindow *parent)
{
    g_return_if_fail (E_IS_SHELL (shell));
    g_return_if_fail (GTK_IS_WINDOW (parent));

    g_signal_emit (shell, signals[SEND_RECEIVE], 0, parent);
}

/**
 * e_shell_get_network_available:
 * @shell: an #EShell
 *
 * Returns %TRUE if a network is available.
 *
 * Returns: %TRUE if a network is available
 **/
gboolean
e_shell_get_network_available (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), FALSE);

    return shell->priv->network_available;
}

/**
 * e_shell_set_network_available:
 * @shell: an #EShell
 * @network_available: whether a network is available
 *
 * Sets whether a network is available.  This is usually called in
 * response to a status change signal from NetworkManager.  If the
 * network becomes unavailable while #EShell:online is %TRUE, the
 * @shell will force #EShell:online to %FALSE until the network
 * becomes available again.
 **/
void
e_shell_set_network_available (EShell *shell,
                               gboolean network_available)
{
    g_return_if_fail (E_IS_SHELL (shell));

    if (network_available == shell->priv->network_available)
        return;

    shell->priv->network_available = network_available;
    g_object_notify (G_OBJECT (shell), "network-available");

    /* If we're being forced offline, perhaps due to a network outage,
     * reconnect automatically when the network becomes available. */
    if (!network_available && shell->priv->online) {
        g_message ("Network disconnected.  Forced offline.");
        e_shell_set_online (shell, FALSE);
        shell->priv->auto_reconnect = TRUE;
    } else if (network_available && shell->priv->auto_reconnect) {
        g_message ("Connection established.  Going online.");
        e_shell_set_online (shell, TRUE);
        shell->priv->auto_reconnect = FALSE;
    }
}

/**
 * e_shell_get_online:
 * @shell: an #EShell
 *
 * Returns %TRUE if Evolution is online, %FALSE if Evolution is offline.
 * Evolution may be offline because the user elected to work offline, or
 * because the network has become unavailable.
 *
 * Returns: %TRUE if Evolution is online
 **/
gboolean
e_shell_get_online (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), FALSE);

    return shell->priv->online;
}

/**
 * e_shell_set_online:
 * @shell: an #EShell
 * @online: %TRUE to go online, %FALSE to go offline
 *
 * Asynchronously places Evolution in online or offline mode.
 **/
void
e_shell_set_online (EShell *shell,
                    gboolean online)
{
    g_return_if_fail (E_IS_SHELL (shell));

    if (online == shell->priv->online)
        return;

    if (online)
        shell_prepare_for_online (shell);
    else
        shell_prepare_for_offline (shell);
}

/**
 * e_shell_get_preferences_window:
 * @shell: an #EShell
 *
 * Returns the Evolution Preferences window.
 *
 * Returns: the preferences window
 **/
GtkWidget *
e_shell_get_preferences_window (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    return shell->priv->preferences_window;
}

/**
 * e_shell_event:
 * @shell: an #EShell
 * @event_name: the name of the event
 * @event_data: data associated with the event
 *
 * The #EShell::event signal acts as a cheap mechanism for broadcasting
 * events to the rest of the application, such as new mail arriving.  The
 * @event_name is used as the signal detail, and @event_data may point to
 * an object or data structure associated with the event.
 **/
void
e_shell_event (EShell *shell,
               const gchar *event_name,
               gpointer event_data)
{
    GQuark detail;

    g_return_if_fail (E_IS_SHELL (shell));
    g_return_if_fail (event_name != NULL);

    detail = g_quark_from_string (event_name);
    g_signal_emit (shell, signals[EVENT], detail, event_data);
}

gboolean
e_shell_is_busy (EShell *shell)
{
    /* FIXME */
    return FALSE;
}

gboolean
e_shell_do_quit (EShell *shell)
{
    /* FIXME */
    return TRUE;
}

gboolean
e_shell_quit (EShell *shell)
{
    /* FIXME */
    return TRUE;
}