path: root/shell/e-shell.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-shell.c
 *
 * Copyright (C) 2000, 2001, 2002, 2003 Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * Author: Ettore Perazzoli
 */

#include <config.h>

#include <string.h>
#include <sys/types.h>

#include <glib.h>
#include <glib/gstdio.h>

#include <gtk/gtkmain.h>
#include <gtk/gtksignal.h>

#ifdef GDK_WINDOWING_X11
#include <gdk/gdkprivate.h>
#include <gdk/gdkx.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#elif defined (GDK_WINDOWING_WIN32)
/* gdkwin32.h includes <windows.h> which stomps over the namespace */
#undef DATADIR
#define interface windows_interface
#include <gdk/gdkwin32.h>
#undef interface
#endif

#include <glib/gi18n.h>
#include <libgnome/gnome-util.h>

#include <gconf/gconf-client.h>

#include <bonobo-activation/bonobo-activation.h>
#include <bonobo/bonobo-exception.h>
#include <bonobo/bonobo-moniker-util.h>

#include <libedataserver/e-xml-utils.h>
#include <libedataserverui/e-passwords.h>

#include "e-util/e-bconf-map.h"
#include "e-util/e-dialog-utils.h"
#include "e-util/e-error.h"
#include "e-util/e-fsutils.h"
#include "e-util/e-util.h"

#include "Evolution.h"
#include "e-shell-constants.h"
#include "e-shell-marshal.h"
#include "e-shell-settings-dialog.h"
#include "e-shell.h"
#include "e-shell-view.h"
#include "es-event.h"
#include "evolution-listener.h"
#include "evolution-shell-component-utils.h"

static void set_line_status_complete(EvolutionListener *el, void *data);

#define PARENT_TYPE bonobo_object_get_type ()
static BonoboObjectClass *parent_class = NULL;
static gboolean session_started = FALSE;

struct _EShellPrivate {
    /* IID for registering the object on OAF.  */
    char *iid;

    GList *windows;

    /* EUriSchemaRegistry *uri_schema_registry; FIXME */
    EComponentRegistry *component_registry;

    /* Names for the types of the folders that have maybe crashed.  */
    /* FIXME TODO */
    GList *crash_type_names; /* char * */

    /* Line status and controllers  */
    EShellLineStatus line_status;
    int line_status_pending;
    EShellLineStatus line_status_working;
    EvolutionListener *line_status_listener;

    /* Settings Dialog */
    union {
        GtkWidget *settings_dialog;
        gpointer settings_dialog_pointer;
    };

    /* If we're quitting and things are still busy, a timeout handler */
    guint quit_timeout;

    /* Whether the shell is succesfully initialized.  This is needed during
       the start-up sequence, to avoid CORBA calls to do make wrong things
       to happen while the shell is initializing.  */
    unsigned int is_initialized : 1;

    /* Wether the shell is working in "interactive" mode or not.
       (Currently, it's interactive IIF there is at least one active
       view.)  */
    unsigned int is_interactive : 1;

    /* Whether quit has been requested, and the shell is now waiting for
       permissions from all the components to quit.  */
    unsigned int preparing_to_quit : 1;
};


/* Signals.  */

enum {
    NO_WINDOWS_LEFT,
    LINE_STATUS_CHANGED,
    NEW_WINDOW_CREATED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };


/* Utility functions.  */

static gboolean
get_config_start_offline (void)
{
    GConfClient *client;
    gboolean value;

    client = gconf_client_get_default ();

    value = gconf_client_get_bool (client, "/apps/evolution/shell/start_offline", NULL);

    g_object_unref (client);

    return value;
}


/* Interactivity handling.  */

static void
set_interactive (EShell *shell,
         gboolean interactive)
{
    GSList *component_list;
    GSList *p;
    GList *first_element;
    int num_windows;
    GtkWidget *view;

    g_return_if_fail (E_IS_SHELL (shell));
    
    shell->priv->is_interactive = interactive;

    num_windows = g_list_length (shell->priv->windows);
    
    /* We want to send the "interactive" message only when the first
    window is created */
    if (num_windows != 1)
        return;

    first_element = g_list_first (shell->priv->windows);
    view = GTK_WIDGET (first_element->data);

    component_list = e_component_registry_peek_list (shell->priv->component_registry);

    for (p = component_list; p != NULL; p = p->next) {
        EComponentInfo *info = p->data;
        CORBA_Environment ev;

        CORBA_exception_init (&ev);

#ifdef GDK_WINDOWING_X11
        GNOME_Evolution_Component_interactive (info->iface, interactive,GPOINTER_TO_INT (GDK_WINDOW_XWINDOW (view->window)), &ev);
#elif defined (GDK_WINDOWING_WIN32)
        GNOME_Evolution_Component_interactive (info->iface, interactive,GPOINTER_TO_INT (GDK_WINDOW_HWND (view->window)), &ev);
#else
#error Port this to your windowing system
#endif

        /* Ignore errors, the components can decide to not implement
           this interface. */
        
        CORBA_exception_free (&ev);
    }
}


/* CORBA interface implementation.  */

static gboolean
raise_exception_if_not_ready (PortableServer_Servant servant,
                  CORBA_Environment *ev)
{
    EShell *shell;

    shell = E_SHELL (bonobo_object_from_servant (servant));

    if (! shell->priv->is_initialized) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Shell_NotReady, NULL);
        return TRUE;
    }

    return FALSE;
}

static GNOME_Evolution_ShellView
impl_Shell_createNewWindow (PortableServer_Servant servant,
                const CORBA_char *component_id,
                CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EShell *shell;
    EShellWindow *shell_window;
    EShellView *shell_view;

    if (raise_exception_if_not_ready (servant, ev))
        return CORBA_OBJECT_NIL;

    bonobo_object = bonobo_object_from_servant (servant);
    shell = E_SHELL (bonobo_object);

    if (component_id[0] == '\0')
        component_id = NULL;

    shell_window = e_shell_create_window (shell, component_id, NULL);
    if (shell_window == NULL) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION,
                     ex_GNOME_Evolution_Shell_ComponentNotFound, NULL);
        return CORBA_OBJECT_NIL;
    }

    /* refs?? */
    shell_view = e_shell_view_new(shell_window);
    
    return BONOBO_OBJREF(shell_view);

}

static void
impl_Shell_handleURI (PortableServer_Servant servant,
              const CORBA_char *uri,
              CORBA_Environment *ev)
{
    EShell *shell = E_SHELL (bonobo_object_from_servant (servant));
    EComponentInfo *component_info;
    char *schema, *p;
    int show = FALSE;

    schema = g_alloca(strlen(uri)+1);
    strcpy(schema, uri);
    p = strchr(schema, ':');
    if (p)
        *p = 0;

    component_info = e_component_registry_peek_info(shell->priv->component_registry, ECR_FIELD_SCHEMA, schema);
    if (component_info == NULL) {
        show = TRUE;
        component_info = e_component_registry_peek_info(shell->priv->component_registry, ECR_FIELD_ALIAS, schema);
    }

    if (component_info == NULL) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION, ex_GNOME_Evolution_Shell_UnsupportedSchema, NULL);
        return;
    }

    if (show) {
        GtkWidget *shell_window;
        
        shell_window = (GtkWidget *)e_shell_create_window (shell, component_info->id, NULL);
        if (shell_window == NULL) {
            CORBA_exception_set (ev, CORBA_USER_EXCEPTION, ex_GNOME_Evolution_Shell_ComponentNotFound, NULL);
            return;
        }
    }
    
    GNOME_Evolution_Component_handleURI (component_info->iface, uri, ev);
    /* not an error not to implement it */
    if (ev->_id != NULL && strcmp(ev->_id, ex_CORBA_NO_IMPLEMENT) == 0)
        memset(ev, 0, sizeof(*ev));
}

static void
impl_Shell_setLineStatus (PortableServer_Servant servant,
              CORBA_boolean online,
              CORBA_Environment *ev)
{
    BonoboObject *bonobo_object;
    EShell *shell;

    if (raise_exception_if_not_ready (servant, ev))
        return;

    bonobo_object = bonobo_object_from_servant (servant);
    shell = E_SHELL (bonobo_object);

    /* let the password manager know out online status */
    e_passwords_set_online(online);

    if (online)
        e_shell_go_online (shell, NULL, GNOME_Evolution_USER_ONLINE);
    else
        e_shell_go_offline (shell, NULL, GNOME_Evolution_USER_OFFLINE);
}
/*
static GNOME_Evolution_Component
impl_Shell_findComponent(PortableServer_Servant servant,
             const CORBA_char *id,
             CORBA_Environment *ev)
{
    EShell *shell;
    EComponentInfo *ci;

    if (raise_exception_if_not_ready (servant, ev))
        return CORBA_OBJECT_NIL;

    shell = (EShell *)bonobo_object_from_servant (servant);
    ci = e_component_registry_peek_info(shell->priv->component_registry, ECR_FIELD_ALIAS, id);
    if (ci == NULL) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION, ex_GNOME_Evolution_Shell_ComponentNotFound, NULL);
        return CORBA_OBJECT_NIL;
    } else if (ci->iface == NULL) {
        CORBA_exception_set (ev, CORBA_USER_EXCEPTION, ex_GNOME_Evolution_Shell_NotReady, NULL);
        return CORBA_OBJECT_NIL;
    } else {
        return ci->iface;
    }
}
*/

/* EShellWindow handling and bookkeeping.  */

static int
window_delete_event_cb (GtkWidget *widget,
              GdkEventAny *ev,
              void *data)
{
    EShell *shell;

    g_return_val_if_fail (E_IS_SHELL_WINDOW (widget), TRUE);
    shell = E_SHELL (data);

    return ! e_shell_request_close_window (shell, E_SHELL_WINDOW (widget));
}

static gboolean
notify_no_windows_left_idle_cb (void *data)
{
    EShell *shell;
    EShellPrivate *priv;

    shell = E_SHELL (data);
    priv = shell->priv;

    set_interactive (shell, FALSE);

    g_signal_emit (shell, signals [NO_WINDOWS_LEFT], 0);

    if (priv->iid != NULL)
        bonobo_activation_active_server_unregister (priv->iid,
                                bonobo_object_corba_objref (BONOBO_OBJECT (shell)));
    bonobo_object_unref (BONOBO_OBJECT (shell));

    return FALSE;
}

static void
window_weak_notify (void *data,
            GObject *where_the_object_was)
{
    EShell *shell;
    int num_windows;

    shell = E_SHELL (data);

    num_windows = g_list_length (shell->priv->windows);

    /* If this is our last window, save settings now because in the callback
       for no_windows_left shell->priv->windows will be NULL and settings won't
       be saved because of that.  */
    if (num_windows == 1)
        e_shell_save_settings (shell);

    shell->priv->windows = g_list_remove (shell->priv->windows, where_the_object_was);

    if (shell->priv->windows == NULL) {
        bonobo_object_ref (BONOBO_OBJECT (shell));
        g_idle_add (notify_no_windows_left_idle_cb, shell);
    }
}

/* GObject methods.  */

static void
impl_dispose (GObject *object)
{
    EShell *shell;
    EShellPrivate *priv;
    GList *p;

    shell = E_SHELL (object);
    priv = shell->priv;

    priv->is_initialized = FALSE;

#if 0               /* FIXME */
    if (priv->uri_schema_registry != NULL) {
        g_object_unref (priv->uri_schema_registry);
        priv->uri_schema_registry = NULL;
    }
#endif

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

    if (priv->quit_timeout) {
        g_source_remove(priv->quit_timeout);
        priv->quit_timeout = 0;
    }

    for (p = priv->windows; p != NULL; p = p->next) {
        EShellWindow *window;

        window = E_SHELL_WINDOW (p->data);

        g_signal_handlers_disconnect_by_func (window, G_CALLBACK (window_delete_event_cb), shell);
        g_object_weak_unref (G_OBJECT (window), window_weak_notify, shell);

        gtk_object_destroy (GTK_OBJECT (window));
    }

    g_list_free (priv->windows);
    priv->windows = NULL;

    /* No unreffing for these as they are aggregate.  */
    /* bonobo_object_unref (BONOBO_OBJECT (priv->corba_storage_registry)); */

    if (priv->settings_dialog != NULL) {
        gtk_widget_destroy (priv->settings_dialog);
        priv->settings_dialog = NULL;
    }

    if (priv->line_status_listener) {
        priv->line_status_listener->complete = NULL;
        bonobo_object_unref(BONOBO_OBJECT(priv->line_status_listener));
        priv->line_status_listener = NULL;
    }

    g_free (priv->iid);
    (* G_OBJECT_CLASS (parent_class)->dispose) (object);
}

static void
impl_finalize (GObject *object)
{
    EShell *shell;
    EShellPrivate *priv;

    shell = E_SHELL (object);
    priv = shell->priv;

    g_list_foreach (priv->crash_type_names, (GFunc) g_free, NULL);
    g_list_free (priv->crash_type_names);

    g_free (priv);

    (* G_OBJECT_CLASS (parent_class)->finalize) (object);
}


/* Initialization.  */

static void
e_shell_class_init (EShellClass *klass)
{
    GObjectClass *object_class;
    POA_GNOME_Evolution_Shell__epv *epv;

    parent_class = g_type_class_ref(PARENT_TYPE);

    object_class = G_OBJECT_CLASS (klass);
    object_class->dispose  = impl_dispose;
    object_class->finalize = impl_finalize;

    signals[NO_WINDOWS_LEFT] =
        g_signal_new ("no_windows_left",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EShellClass, no_windows_left),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    signals[LINE_STATUS_CHANGED] =
        g_signal_new ("line_status_changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EShellClass, line_status_changed),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__INT,
                  G_TYPE_NONE, 1,
                  G_TYPE_INT);

    signals[NEW_WINDOW_CREATED] =
        g_signal_new ("new_window_created",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (EShellClass, new_window_created),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__POINTER,
                  G_TYPE_NONE, 1,
                  G_TYPE_POINTER);

    epv = & klass->epv;
    epv->createNewWindow = impl_Shell_createNewWindow;
    epv->handleURI       = impl_Shell_handleURI;
    epv->setLineStatus   = impl_Shell_setLineStatus;
/*  epv->findComponent   = impl_Shell_findComponent;*/
}

static void
e_shell_init (EShell *shell)
{
    EShellPrivate *priv;

    priv = g_new0 (EShellPrivate, 1);
    priv->line_status                  = E_SHELL_LINE_STATUS_OFFLINE;
    priv->component_registry           = e_component_registry_new ();

    shell->priv = priv;

    priv->line_status_listener = evolution_listener_new(set_line_status_complete, shell);
}

static void
detect_version (GConfClient *gconf, int *major, int *minor, int *revision)
{
    char *val, *evolution_dir;
    struct stat st;
    
    evolution_dir = g_build_filename (g_get_home_dir (), "evolution", NULL);
    
    val = gconf_client_get_string(gconf, "/apps/evolution/version", NULL);  
    if (val) {
        /* Since 1.4.0 We've been keeping the version key in gconf */
        sscanf(val, "%d.%d.%d", major, minor, revision);
        g_free(val);
    } else if (g_lstat (evolution_dir, &st) != 0 || !S_ISDIR (st.st_mode)) {
        /* If ~/evolution does not exit or is not a directory it must be a new installation */
        *major = 0;
        *minor = 0;
        *revision = 0;
    } else {
        xmlDocPtr config_doc;
        xmlNodePtr source;
        char *tmp;

        tmp = g_build_filename (evolution_dir, "config.xmldb", NULL);
        config_doc = e_xml_parse_file (tmp);
        g_free (tmp);
        tmp = NULL;

        if (config_doc
            && (source = e_bconf_get_path (config_doc, "/Shell"))
            && (tmp = e_bconf_get_value (source, "upgrade_from_1_0_to_1_2_performed"))
            && tmp[0] == '1' ) {
            *major = 1;
            *minor = 2;
            *revision = 0;
        } else {
            *major = 1;
            *minor = 0;
            *revision = 0;
        }
        g_free (tmp);
        if (config_doc)
            xmlFreeDoc (config_doc);        
    }

    g_free (evolution_dir);
}

/* calls components to perform upgrade */
static gboolean
attempt_upgrade (EShell *shell, int major, int minor, int revision)
{
    GSList *component_infos, *p;
    gboolean success;
    int res;

    success = TRUE;

    component_infos = e_component_registry_peek_list (shell->priv->component_registry);
    for (p = component_infos; success && p != NULL; p = p->next) {
        const EComponentInfo *info = p->data;
        CORBA_Environment ev;

        CORBA_exception_init (&ev);
        
        GNOME_Evolution_Component_upgradeFromVersion (info->iface, major, minor, revision, &ev);
        
        if (BONOBO_EX (&ev)) {
            char *exception_text;
            CORBA_char *id = CORBA_exception_id(&ev);

            if (strcmp (id, ex_CORBA_NO_IMPLEMENT) == 0) {
                /* Ignore components that do not implement this version, it
                   might just mean that they don't need an upgrade path. */
            } else if (strcmp (id,  ex_GNOME_Evolution_Component_UpgradeFailed) == 0) {
                GNOME_Evolution_Component_UpgradeFailed *ex = CORBA_exception_value(&ev);

                res = e_error_run(NULL, "shell:upgrade-failed", ex->what, ex->why, NULL);
                if (res == GTK_RESPONSE_CANCEL)
                    success = FALSE;
            } else if (strcmp (id,  ex_GNOME_Evolution_Component_UnsupportedVersion) == 0) {
                /* This is non-fatal */
                /* DO WE CARE??? */
                printf("Upgrade of component failed, unsupported prior version\n");
            } else {
                exception_text = bonobo_exception_get_text (&ev);
                res = e_error_run(NULL, "shell:upgrade-failed", exception_text, _("Uknown system error."), NULL);
                g_free (exception_text);
                if (res == GTK_RESPONSE_CANCEL)
                    success = FALSE;
            }
        }
        CORBA_exception_free (&ev);
    }

    return success;
}

/**
 * e_shell_construct:
 * @shell: An EShell object to construct
 * @iid: OAFIID for registering the shell into the name server
 * @startup_line_mode: How to set up the line mode (online or offline) initally.
 * 
 * Construct @shell so that it uses the specified @corba_object.
 *
 * Return value: The result of the operation.
 **/
EShellConstructResult
e_shell_construct (EShell *shell,
           const char *iid,
           EShellStartupLineMode startup_line_mode)
{
    EShellPrivate *priv;
    CORBA_Object corba_object;
    gboolean start_online;
    GSList *component;
    
    g_return_val_if_fail (E_IS_SHELL (shell), E_SHELL_CONSTRUCT_RESULT_INVALIDARG);
    g_return_val_if_fail (startup_line_mode == E_SHELL_STARTUP_LINE_MODE_CONFIG
                  || startup_line_mode == E_SHELL_STARTUP_LINE_MODE_ONLINE
                  || startup_line_mode == E_SHELL_STARTUP_LINE_MODE_OFFLINE,
                  E_SHELL_CONSTRUCT_RESULT_INVALIDARG);
    
    priv = shell->priv;
    priv->iid = g_strdup (iid);

    /* Now we can register into OAF.  Notice that we shouldn't be
       registering into OAF until we are sure we can complete.  */
    
    /* FIXME: Multi-display stuff.  */
    corba_object = bonobo_object_corba_objref (BONOBO_OBJECT (shell));
    if (bonobo_activation_active_server_register (iid, corba_object) != Bonobo_ACTIVATION_REG_SUCCESS)
        return E_SHELL_CONSTRUCT_RESULT_CANNOTREGISTER;

    while (gtk_events_pending ())
        gtk_main_iteration ();  
    
    /* activate all the components (peek list does this implictly) */
    /* Do we really need to assign the result of this to the list? */
    component = e_component_registry_peek_list (shell->priv->component_registry);
    
    e_shell_attempt_upgrade(shell);

    priv->is_initialized = TRUE;

    switch (startup_line_mode) {
    case E_SHELL_STARTUP_LINE_MODE_CONFIG:
        start_online = ! get_config_start_offline ();
        break;
    case E_SHELL_STARTUP_LINE_MODE_ONLINE:
        start_online = TRUE;
        break;
    case E_SHELL_STARTUP_LINE_MODE_OFFLINE:
        start_online = FALSE;
        break;
    default:
        start_online = FALSE; /* Make compiler happy.  */
        g_return_val_if_reached(E_SHELL_CONSTRUCT_RESULT_OK);
    }

    e_passwords_set_online(start_online);

    if (start_online)
        e_shell_go_online (shell, NULL, GNOME_Evolution_USER_ONLINE);

    return E_SHELL_CONSTRUCT_RESULT_OK;
}

/**
 * e_shell_new:
 * @start_online: Whether to start in on-line mode or not.
 * @construct_result_return: A pointer to an EShellConstructResult variable into
 * which the result of the operation will be stored.
 * 
 * Create a new EShell.
 * 
 * Return value: 
 **/
EShell *
e_shell_new (EShellStartupLineMode startup_line_mode,
         EShellConstructResult *construct_result_return)
{
    EShell *new;
    EShellConstructResult construct_result;

    new = g_object_new (e_shell_get_type (), NULL);

    construct_result = e_shell_construct (new, E_SHELL_OAFIID, startup_line_mode);

    if (construct_result != E_SHELL_CONSTRUCT_RESULT_OK) {
        *construct_result_return = construct_result;
        bonobo_object_unref (BONOBO_OBJECT (new));
        return NULL;
    }

    *construct_result_return = E_SHELL_CONSTRUCT_RESULT_OK;
    return new;
}

static int
remove_dir(const char *root, const char *path)
{
    GDir *dir;
    const char *dname;
    int res = -1;
    char *new = NULL;
    struct stat st;

    dir = g_dir_open(path, 0, NULL);
    if (dir == NULL)
        return -1;

    while ( (dname = g_dir_read_name(dir)) ) {
        new = g_build_filename(path, dname, NULL);
        if (g_stat(new, &st) == -1)
            goto fail;

        /* make sure we're really removing something from evolution dir */
        g_return_val_if_fail (strlen(path) >= strlen(root)
             && strncmp(root, path, strlen(root)) == 0, -1);

        if (S_ISDIR(st.st_mode)) {
            if (remove_dir(root, new) == -1)
                goto fail;
        } else {
            if (g_unlink(new) == -1)
                goto fail;
        }
        g_free(new);
        new = NULL;
    }

    res = g_rmdir(path);
fail:
    g_free(new);
    g_dir_close(dir);
    return res;
}

/**
 * e_shell_attempt_upgrade:
 * @shell: 
 * 
 * Upgrade config and components from the currently installed version.
 * 
 * Return value: %TRUE If it works.  If it fails the application will exit.
 **/
gboolean
e_shell_attempt_upgrade (EShell *shell)
{
    GConfClient *gconf_client;
    int major = 0, minor = 0, revision = 0;
    int lmajor, lminor, lrevision;
    int cmajor, cminor, crevision;
    char *version_string, *last_version = NULL;
    int done_upgrade = FALSE;
    char *oldpath;
    struct stat st;
    ESEvent *ese;

    gconf_client = gconf_client_get_default();

    oldpath = g_build_filename(g_get_home_dir(), "evolution", NULL);

    g_return_val_if_fail (sscanf(BASE_VERSION, "%u.%u", &cmajor, &cminor) == 2, TRUE);
    crevision = atoi(UPGRADE_REVISION);

    detect_version (gconf_client, &major, &minor, &revision);

    if (!(cmajor > major
          || (cmajor == major && cminor > minor)
          || (cminor == minor && crevision > revision)))
        goto check_old;

    /* if upgrading from < 1.5, we need to copy most data from ~/evolution to ~/.evolution */
    if (major == 1 && minor < 5) {
        long size, space;

        size = e_fsutils_usage(oldpath);
        space = e_fsutils_avail(g_get_home_dir());
        if (size != -1 && space != -1 && space < size) {
            char *required = g_strdup_printf(_("%ld KB"), size);
            char *have = g_strdup_printf(_("%ld KB"), space);

            e_error_run(NULL, "shell:upgrade-nospace", required, have, NULL);
            g_free(required);
            g_free(have);
            _exit(0);
        }
    }

    if (!attempt_upgrade (shell, major, minor, revision))
        _exit(0);

    /* mark as upgraded */
    version_string = g_strdup_printf ("%s.%s", BASE_VERSION, UPGRADE_REVISION);
    gconf_client_set_string (gconf_client, "/apps/evolution/version", version_string, NULL);
    done_upgrade = TRUE;

check_old:
    /* if the last upgraded version was old, check for stuff to remove */
    if (done_upgrade
        ||  (last_version = gconf_client_get_string (gconf_client, "/apps/evolution/last_version", NULL)) == NULL
        ||  sscanf(last_version, "%d.%d.%d", &lmajor, &lminor, &lrevision) != 3) {
        lmajor = major;
        lminor = minor;
        lrevision = revision;
    }
    g_free(last_version);

    if (lmajor == 1 && lminor < 5
        && g_stat(oldpath, &st) == 0
        && S_ISDIR(st.st_mode)) {
        int res;

        last_version = g_strdup_printf("%d.%d.%d", lmajor, lminor, lrevision);
        res = e_error_run(NULL, "shell:upgrade-remove-1-4", last_version, NULL);
        g_free(last_version);

        switch (res) {
        case GTK_RESPONSE_OK: /* 'delete' */
            if (e_error_run(NULL, "shell:upgrade-remove-1-4-confirm", NULL) == GTK_RESPONSE_OK)
                remove_dir(oldpath, oldpath);
            else
                break;
            /* falls through */
        case GTK_RESPONSE_ACCEPT: /* 'keep' */
            lmajor = cmajor;
            lminor = cminor;
            lrevision = crevision;
            break;
        default:
            /* cancel - noop */
            break;
        }
    } else {
        /* otherwise 'last version' is now the same as current */
        lmajor = cmajor;
        lminor = cminor;
        lrevision = crevision;
    }

    last_version = g_strdup_printf("%d.%d.%d", lmajor, lminor, lrevision);
    gconf_client_set_string (gconf_client, "/apps/evolution/last_version", last_version, NULL);
    g_free(last_version);

    g_free(oldpath);
    g_object_unref (gconf_client);

    /** @Event: Shell attempted upgrade
     * @Id: upgrade.done
     * @Target: ESMenuTargetState
     * 
     * This event is emitted whenever the shell successfully attempts an upgrade.
     *
     */
    ese = es_event_peek();
    e_event_emit((EEvent *)ese, "upgrade.done", (EEventTarget *)es_event_target_new_upgrade(ese, cmajor, cminor, crevision));
    
    return TRUE;
}

/**
 * e_shell_create_window:
 * @shell: The shell for which to create a new window.
 * @component_id: Id or alias of the component to display in the new window.
 * @template_window: Window from which to copy the window settings (can be %NULL).
 * 
 * Create a new window for @uri.
 * 
 * Return value: The new window.
 **/
EShellWindow *
e_shell_create_window (EShell *shell,
               const char *component_id,
               EShellWindow *template_window)
{
    EShellWindow *window;

    /* FIXME need to actually copy settings from template_window.  */

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

    window = E_SHELL_WINDOW (e_shell_window_new (shell, component_id));

    g_signal_connect (window, "delete_event", G_CALLBACK (window_delete_event_cb), shell);
    g_object_weak_ref (G_OBJECT (window), window_weak_notify, shell);
    shell->priv->windows = g_list_prepend (shell->priv->windows, window);

    g_signal_emit (shell, signals[NEW_WINDOW_CREATED], 0, window);

    gtk_widget_show (GTK_WIDGET (window));

    e_error_default_parent((GtkWindow *)window);

    set_interactive (shell, TRUE);

    if (!session_started) {
        ESEvent *ese;
        
        session_started = TRUE;
        ese = es_event_peek();
        e_event_emit((EEvent *)ese, "started.done", (EEventTarget *)es_event_target_new_shell(ese, shell));
    }
    return window;
}

gboolean
e_shell_request_close_window (EShell *shell,
                  EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL (shell), FALSE);
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), FALSE);

    e_shell_save_settings (shell);

    if (g_list_length (shell->priv->windows) != 1) {
        /* Not the last window.  */
        return TRUE;
    }

    return e_shell_quit(shell);
}

#if 0               /* FIXME */
/**
 * e_shell_peek_uri_schema_registry:
 * @shell: An EShell object.
 * 
 * Get the schema registry associated to @shell.
 * 
 * Return value: A pointer to the EUriSchemaRegistry associated to @shell.
 **/
EUriSchemaRegistry  *
e_shell_peek_uri_schema_registry (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    return shell->priv->uri_schema_registry;
}
#endif


/**
 * e_shell_peek_component_registry:
 * @shell: 
 * 
 * Get the component registry associated to @shell.
 * 
 * Return value: 
 **/
EComponentRegistry *
e_shell_peek_component_registry (EShell *shell)
{
    g_return_val_if_fail (E_IS_SHELL (shell), NULL);

    return shell->priv->component_registry;
}


/**
 * e_shell_save_settings:
 * @shell: 
 * 
 * Save the settings for this shell.
 * 
 * Return value: %TRUE if it worked, %FALSE otherwise.  Even if %FALSE is
 * returned, it is possible that at least part of the settings for the windows
 * have been saved.
 **/
gboolean
e_shell_save_settings (EShell *shell)
{
    GConfClient *client;
    gboolean is_offline;

    is_offline = ( e_shell_get_line_status (shell) == E_SHELL_LINE_STATUS_OFFLINE );

    client = gconf_client_get_default ();
    gconf_client_set_bool (client, "/apps/evolution/shell/start_offline", is_offline, NULL);
    g_object_unref (client);

    return TRUE;
}

/**
 * e_shell_close_all_windows:
 * @shell: 
 * 
 * Destroy all the windows in @shell.
 **/
void
e_shell_close_all_windows (EShell *shell)
{
    EShellPrivate *priv;
    GList *p, *pnext;

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

    if (shell->priv->windows)
        e_shell_save_settings (shell); 

    priv = shell->priv;
    for (p = priv->windows; p != NULL; p = pnext) {
        pnext = p->next;

        /* Note that this will also remove the window from the list... Hence the
           need for the pnext variable.  */
        gtk_widget_destroy (GTK_WIDGET (p->data));
    }
}

/**
 * e_shell_get_line_status:
 * @shell: A pointer to an EShell object.
 * 
 * Get the line status for @shell.
 * 
 * Return value: The current line status for @shell.
 **/
EShellLineStatus
e_shell_get_line_status (EShell *shell)
{
    g_return_val_if_fail (shell != NULL, E_SHELL_LINE_STATUS_OFFLINE);
    g_return_val_if_fail (E_IS_SHELL (shell), E_SHELL_LINE_STATUS_OFFLINE);

    return shell->priv->line_status;
}


/* Offline/online handling.  */

static void
set_line_status_finished(EShell *shell)
{
    EShellPrivate *priv = shell->priv;
    ESEvent *ese;

    priv->line_status = priv->line_status_working;

    e_passwords_set_online (priv->line_status == E_SHELL_LINE_STATUS_ONLINE);
    g_signal_emit (shell, signals[LINE_STATUS_CHANGED], 0, priv->line_status);

    /** @Event: Shell online state changed
     * @Id: state.changed
     * @Target: ESMenuTargetState
     * 
     * This event is emitted whenever the shell online state changes.
     *
     * Only the online and offline states are emitted.
     */
    ese = es_event_peek();
    e_event_emit((EEvent *)ese, "state.changed", (EEventTarget *)es_event_target_new_state(ese, priv->line_status == E_SHELL_LINE_STATUS_ONLINE));
}

static void
set_line_status_complete(EvolutionListener *el, void *data)
{
    EShell *shell = data;
    EShellPrivate *priv = shell->priv;

    if (priv->line_status_pending > 0) {
        priv->line_status_pending--;
        if (priv->line_status_pending == 0)
            set_line_status_finished(shell);
    }
}

static void
set_line_status(EShell *shell, GNOME_Evolution_ShellState shell_state)
{
    EShellPrivate *priv;
    GSList *component_infos;
    GSList *p;
    CORBA_Environment ev;
    GConfClient *client;
    gboolean status;

    priv = shell->priv;
    
    if (shell_state == GNOME_Evolution_FORCED_OFFLINE || shell_state == GNOME_Evolution_USER_OFFLINE)
        status = FALSE;
    else 
        status = TRUE;

    if ((status && priv->line_status == E_SHELL_LINE_STATUS_ONLINE)
        || (!status && priv->line_status != E_SHELL_LINE_STATUS_ONLINE))
        return;

    /* we use 'going offline' to mean 'changing status' now */
    priv->line_status = E_SHELL_LINE_STATUS_GOING_OFFLINE;
    g_signal_emit (shell, signals[LINE_STATUS_CHANGED], 0, priv->line_status);

    client = gconf_client_get_default ();
    gconf_client_set_bool (client, "/apps/evolution/shell/start_offline", !status, NULL);
    g_object_unref (client);

    priv->line_status_working = status?E_SHELL_LINE_STATUS_ONLINE:E_SHELL_LINE_STATUS_OFFLINE;
    /* we start at 2: setLineStatus could recursively call back, we therefore
       `need to not complete till we're really complete */
    priv->line_status_pending += 2;

    component_infos = e_component_registry_peek_list (priv->component_registry);
    for (p = component_infos; p != NULL; p = p->next) {
        EComponentInfo *info = p->data;

        CORBA_exception_init (&ev);

        GNOME_Evolution_Component_setLineStatus(info->iface, shell_state, bonobo_object_corba_objref((BonoboObject *)priv->line_status_listener), &ev);
        if (ev._major == CORBA_NO_EXCEPTION)
            priv->line_status_pending++;
        
        CORBA_exception_free (&ev);
    }

    priv->line_status_pending -= 2;
    if (priv->line_status_pending == 0)
        set_line_status_finished(shell);
}

/**
 * e_shell_go_offline:
 * @shell: 
 * @action_window: Obsolete/unused.
 * 
 * Make the shell go into off-line mode.
 **/
void
e_shell_go_offline (EShell *shell,
            EShellWindow *action_window, GNOME_Evolution_ShellState shell_state)
{
    g_return_if_fail (shell != NULL);
    g_return_if_fail (E_IS_SHELL (shell));
    g_return_if_fail (action_window != NULL);
    g_return_if_fail (action_window == NULL || E_IS_SHELL_WINDOW (action_window));

    set_line_status(shell, shell_state);
}

/**
 * e_shell_go_online:
 * @shell: 
 * @action_window: Obsolete/unused.
 * 
 * Make the shell go into on-line mode.
 **/
void
e_shell_go_online (EShell *shell,
           EShellWindow *action_window, GNOME_Evolution_ShellState shell_state)
{
    g_return_if_fail (shell != NULL);
    g_return_if_fail (E_IS_SHELL (shell));
    g_return_if_fail (action_window == NULL || E_IS_SHELL_WINDOW (action_window));

    set_line_status(shell, shell_state);
}

void
e_shell_send_receive (EShell *shell)
{
    GSList *component_list;
    GSList *p;

    g_return_if_fail (E_IS_SHELL (shell));

    component_list = e_component_registry_peek_list (shell->priv->component_registry);

    for (p = component_list; p != NULL; p = p->next) {
        EComponentInfo *info = p->data;
        CORBA_Environment ev;

        CORBA_exception_init (&ev);

        GNOME_Evolution_Component_sendAndReceive (info->iface, &ev);

        /* Ignore errors, the components can decide to not implement
           this interface. */

        CORBA_exception_free (&ev);
    }
}


void
e_shell_show_settings (EShell *shell,
               const char *type,
               EShellWindow *shell_window)
{
    EShellPrivate *priv;
    
    g_return_if_fail (shell != NULL);
    g_return_if_fail (E_IS_SHELL (shell));

    priv = shell->priv;
    
    if (priv->settings_dialog != NULL) {
        gdk_window_show (priv->settings_dialog->window);
        gtk_widget_grab_focus (priv->settings_dialog);
        return;
    }
    
    priv->settings_dialog = e_shell_settings_dialog_new ();

    if (type != NULL)
        e_shell_settings_dialog_show_type (E_SHELL_SETTINGS_DIALOG (priv->settings_dialog), type);

    g_object_add_weak_pointer (G_OBJECT (priv->settings_dialog), &priv->settings_dialog_pointer);

    gtk_window_set_transient_for (GTK_WINDOW (priv->settings_dialog), GTK_WINDOW (shell_window));
    gtk_widget_show (priv->settings_dialog);
}


const char *
e_shell_construct_result_to_string (EShellConstructResult result)
{
    switch (result) {
    case E_SHELL_CONSTRUCT_RESULT_OK:
        return _("OK");
    case E_SHELL_CONSTRUCT_RESULT_INVALIDARG:
        return _("Invalid arguments");
    case E_SHELL_CONSTRUCT_RESULT_CANNOTREGISTER:
        return _("Cannot register on OAF");
    case E_SHELL_CONSTRUCT_RESULT_NOCONFIGDB:
        return _("Configuration Database not found");
    case E_SHELL_CONSTRUCT_RESULT_GENERICERROR:
        return _("Generic error");
    default:
        return _("Unknown error");
    }
}

/* timeout handler, so returns TRUE if we can't quit yet */
static gboolean
es_run_quit(EShell *shell)
{
    EShellPrivate *priv;
    GSList *component_infos;
    GSList *sp;
    CORBA_boolean done_quit;

    g_return_val_if_fail (E_IS_SHELL (shell), FALSE);

    priv = shell->priv;
    priv->preparing_to_quit = TRUE;

    component_infos = e_component_registry_peek_list (priv->component_registry);
    done_quit = TRUE;
    for (sp = component_infos; sp != NULL; sp = sp->next) {
        EComponentInfo *info = sp->data;
        CORBA_Environment ev;

        CORBA_exception_init (&ev);

        done_quit = GNOME_Evolution_Component_quit(info->iface, &ev);
        if (BONOBO_EX (&ev)) {
            /* The component might not implement the interface, in which case we assume we can quit. */
            done_quit = TRUE;
        }

        CORBA_exception_free (&ev);

        if (!done_quit)
            break;
    }

    if (done_quit) {
        if  (priv->quit_timeout) {
            g_source_remove(priv->quit_timeout);
            priv->quit_timeout = 0;
        }
        e_shell_close_all_windows(shell);
    } else if (priv->quit_timeout == 0) {
        priv->quit_timeout = g_timeout_add(500, (GSourceFunc)es_run_quit, shell);
    }

    return !done_quit;
}

gboolean
e_shell_quit(EShell *shell)
{
    EShellPrivate *priv;
    GSList *component_infos;
    GSList *sp;
    CORBA_boolean can_quit;

    g_return_val_if_fail (E_IS_SHELL (shell), FALSE);

    priv = shell->priv;

    if (priv->preparing_to_quit)
        return FALSE;

    component_infos = e_component_registry_peek_list (priv->component_registry);
    can_quit = TRUE;
    for (sp = component_infos; sp != NULL; sp = sp->next) {
        EComponentInfo *info = sp->data;
        CORBA_Environment ev;

        CORBA_exception_init (&ev);

        can_quit = GNOME_Evolution_Component_requestQuit (info->iface, &ev);
        if (BONOBO_EX (&ev)) {
            /* The component might not implement the interface, in which case we assume we can quit. */
            can_quit = TRUE;
        }

        CORBA_exception_free (&ev);

        if (! can_quit)
            break;
    }

    if (can_quit) {
        GList *p = shell->priv->windows;

        for (; p != NULL; p = p->next) {
            gtk_widget_set_sensitive (GTK_WIDGET (p->data), FALSE);
            if (p == shell->priv->windows)
                e_shell_window_save_defaults (p->data);
        }
        can_quit = !es_run_quit(shell);
    }

    return can_quit;
}

/**
 * gboolean (*EMainShellFunc) (EShell *shell, EShellWindow *window, gpointer user_data);
 * Function used in @ref e_shell_foreach_shell_window.
 * @param shell Pointer to EShell.
 * @param window Pointer to EShellWindow.
 * @param user_data User's data passed to @ref main_shell_foreach_shell_window.
 * @return TRUE if need to go to next window, FALSE when stop looking for next window.
 **/

/**
 * e_shell_foreach_shell_window
 * This will call function callback for all known EShellWindow of main shell.
 * When there is no shell active, then this will do nothing.
 * @param shell EShell instance.
 * @param func Function to be called.
 * @param user_data User data to pass to func.
 **/
void
e_shell_foreach_shell_window (EShell *shell, EMainShellFunc func, gpointer user_data)
{
    EShellPrivate *priv;
    GList *p;

    if (!shell)
        return;

    priv = shell->priv;

    for (p = priv->windows; p != NULL; p = p->next) {
        EShellWindow *window;

        window = E_SHELL_WINDOW (p->data);

        if (window && !func (shell, window, user_data))
            break;
    }
}

BONOBO_TYPE_FUNC_FULL (EShell, GNOME_Evolution_Shell, PARENT_TYPE, e_shell)