path: root/e-util/e-mail-signature-editor.c

/*
 * e-mail-signature-editor.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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "e-mail-signature-editor.h"

#include <config.h>
#include <string.h>
#include <glib/gi18n.h>

#include "e-alert-dialog.h"
#include "e-alert-sink.h"
#include "e-alert-bar.h"

#define E_MAIL_SIGNATURE_EDITOR_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_SIGNATURE_EDITOR, EMailSignatureEditorPrivate))

typedef struct _AsyncContext AsyncContext;

struct _EMailSignatureEditorPrivate {
    EHTMLEditor *editor;
    GtkActionGroup *action_group;
    EFocusTracker *focus_tracker;
    GCancellable *cancellable;
    ESourceRegistry *registry;
    ESource *source;
    gchar *original_name;

    GtkWidget *entry;       /* not referenced */
};

struct _AsyncContext {
    ESource *source;
    GCancellable *cancellable;
    gchar *contents;
    gsize length;
};

enum {
    PROP_0,
    PROP_EDITOR,
    PROP_FOCUS_TRACKER,
    PROP_REGISTRY,
    PROP_SOURCE
};

static const gchar *ui =
"<ui>\n"
"  <menubar name='main-menu'>\n"
"    <placeholder name='pre-edit-menu'>\n"
"      <menu action='file-menu'>\n"
"        <menuitem action='save-and-close'/>\n"
"        <separator/>"
"        <menuitem action='close'/>\n"
"      </menu>\n"
"    </placeholder>\n"
"  </menubar>\n"
"  <toolbar name='main-toolbar'>\n"
"    <placeholder name='pre-main-toolbar'>\n"
"      <toolitem action='save-and-close'/>\n"
"    </placeholder>\n"
"  </toolbar>\n"
"</ui>";

G_DEFINE_TYPE (
    EMailSignatureEditor,
    e_mail_signature_editor,
    GTK_TYPE_WINDOW)

static void
async_context_free (AsyncContext *async_context)
{
    if (async_context->source != NULL)
        g_object_unref (async_context->source);

    if (async_context->cancellable != NULL)
        g_object_unref (async_context->cancellable);

    g_free (async_context->contents);

    g_slice_free (AsyncContext, async_context);
}

static void
mail_signature_editor_loaded_cb (GObject *object,
                                 GAsyncResult *result,
                                 gpointer user_data)
{
    EHTMLEditor *editor;
    EHTMLEditorView *view;
    ESource *source;
    EMailSignatureEditor *window;
    ESourceMailSignature *extension;
    const gchar *extension_name;
    const gchar *mime_type;
    gchar *contents = NULL;
    gboolean is_html;
    GError *error = NULL;

    source = E_SOURCE (object);
    window = E_MAIL_SIGNATURE_EDITOR (user_data);

    e_source_mail_signature_load_finish (
        source, result, &contents, NULL, &error);

    /* Ignore cancellations. */
    if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
        g_warn_if_fail (contents == NULL);
        g_object_unref (window);
        g_error_free (error);
        return;

    } else if (error != NULL) {
        g_warn_if_fail (contents == NULL);
        e_alert_submit (
            E_ALERT_SINK (window),
            "widgets:no-load-signature",
            error->message, NULL);
        g_object_unref (window);
        g_error_free (error);
        return;
    }

    g_return_if_fail (contents != NULL);

    /* The load operation should have set the MIME type. */
    extension_name = E_SOURCE_EXTENSION_MAIL_SIGNATURE;
    extension = e_source_get_extension (source, extension_name);
    mime_type = e_source_mail_signature_get_mime_type (extension);
    is_html = (g_strcmp0 (mime_type, "text/html") == 0);

    editor = e_mail_signature_editor_get_editor (window);
    view = e_html_editor_get_view (editor);
    e_html_editor_view_set_html_mode (view, is_html);

    if (is_html)
        e_html_editor_view_set_text_html (view, contents);
    else
        e_html_editor_view_set_text_plain (view, contents);

    g_free (contents);

    g_object_unref (window);
}

static gboolean
mail_signature_editor_delete_event_cb (EMailSignatureEditor *editor,
                                       GdkEvent *event)
{
    GtkActionGroup *action_group;
    GtkAction *action;

    action_group = editor->priv->action_group;
    action = gtk_action_group_get_action (action_group, "close");
    gtk_action_activate (action);

    return TRUE;
}

static void
action_close_cb (GtkAction *action,
                 EMailSignatureEditor *window)
{
    EHTMLEditor *editor;
    EHTMLEditorView *view;
    gboolean something_changed = FALSE;
    const gchar *original_name;
    const gchar *signature_name;

    original_name = window->priv->original_name;
    signature_name = gtk_entry_get_text (GTK_ENTRY (window->priv->entry));

    editor = e_mail_signature_editor_get_editor (window);
    view = e_html_editor_get_view (editor);

    something_changed |= webkit_web_view_can_undo (WEBKIT_WEB_VIEW (view));
    something_changed |= (strcmp (signature_name, original_name) != 0);

    if (something_changed) {
        gint response;

        response = e_alert_run_dialog_for_args (
            GTK_WINDOW (window),
            "widgets:ask-signature-changed", NULL);
        if (response == GTK_RESPONSE_YES) {
            GtkActionGroup *action_group;

            action_group = window->priv->action_group;
            action = gtk_action_group_get_action (
                action_group, "save-and-close");
            gtk_action_activate (action);
            return;
        } else if (response == GTK_RESPONSE_CANCEL)
            return;
    }

    gtk_widget_destroy (GTK_WIDGET (window));
}

static void
action_save_and_close_cb (GtkAction *action,
                          EMailSignatureEditor *editor)
{
    GtkEntry *entry;
    EAsyncClosure *closure;
    GAsyncResult *result;
    ESource *source;
    gchar *display_name;
    GError *error = NULL;

    entry = GTK_ENTRY (editor->priv->entry);
    source = e_mail_signature_editor_get_source (editor);

    display_name = g_strstrip (g_strdup (gtk_entry_get_text (entry)));

    /* Make sure the signature name is not blank. */
    if (*display_name == '\0') {
        e_alert_submit (
            E_ALERT_SINK (editor),
            "widgets:blank-signature", NULL);
        gtk_widget_grab_focus (GTK_WIDGET (entry));
        g_free (display_name);
        return;
    }

    e_source_set_display_name (source, display_name);

    g_free (display_name);

    /* Cancel any ongoing load or save operations. */
    if (editor->priv->cancellable != NULL) {
        g_cancellable_cancel (editor->priv->cancellable);
        g_object_unref (editor->priv->cancellable);
    }

    editor->priv->cancellable = g_cancellable_new ();

    closure = e_async_closure_new ();

    e_mail_signature_editor_commit (
        editor, editor->priv->cancellable,
        e_async_closure_callback, closure);

    result = e_async_closure_wait (closure);

    e_mail_signature_editor_commit_finish (editor, result, &error);

    e_async_closure_free (closure);

    /* Ignore cancellations. */
    if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
        g_error_free (error);

    } else if (error != NULL) {
        e_alert_submit (
            E_ALERT_SINK (editor),
            "widgets:no-save-signature",
            error->message, NULL);
        g_error_free (error);

    /* Only destroy the editor if the save was successful. */
    } else {
        ESourceRegistry *registry;

        registry = e_mail_signature_editor_get_registry (editor);

        /* Only make sure that the 'source-changed' is called,
         * thus the preview of the signature is updated on save.
         * It is not called when only signature body is changed
         * (and ESource properties are left unchanged). */
        g_signal_emit_by_name (registry, "source-changed", source);

        gtk_widget_destroy (GTK_WIDGET (editor));
    }
}

static GtkActionEntry entries[] = {

    { "close",
      "window-close",
      N_("_Close"),
      "<Control>w",
      N_("Close"),
      G_CALLBACK (action_close_cb) },

    { "save-and-close",
      "document-save",
      N_("_Save and Close"),
      "<Control>Return",
      N_("Save and Close"),
      G_CALLBACK (action_save_and_close_cb) },

    { "file-menu",
      NULL,
      N_("_File"),
      NULL,
      NULL,
      NULL }
};

static void
mail_signature_editor_set_registry (EMailSignatureEditor *editor,
                                    ESourceRegistry *registry)
{
    g_return_if_fail (E_IS_SOURCE_REGISTRY (registry));
    g_return_if_fail (editor->priv->registry == NULL);

    editor->priv->registry = g_object_ref (registry);
}

static void
mail_signature_editor_set_source (EMailSignatureEditor *editor,
                                  ESource *source)
{
    GDBusObject *dbus_object = NULL;
    const gchar *extension_name;
    GError *error = NULL;

    g_return_if_fail (source == NULL || E_IS_SOURCE (source));
    g_return_if_fail (editor->priv->source == NULL);

    if (source != NULL)
        dbus_object = e_source_ref_dbus_object (source);

    /* Clone the source so we can make changes to it freely. */
    editor->priv->source = e_source_new (dbus_object, NULL, &error);

    if (dbus_object != NULL)
        g_object_unref (dbus_object);

    /* This should rarely fail.  If the file was loaded successfully
     * once then it should load successfully here as well, unless an
     * I/O error occurs. */
    if (error != NULL) {
        g_warning ("%s: %s", G_STRFUNC, error->message);
        g_error_free (error);
    }

    /* Make sure the source has a mail signature extension. */
    extension_name = E_SOURCE_EXTENSION_MAIL_SIGNATURE;
    e_source_get_extension (editor->priv->source, extension_name);
}

static void
mail_signature_editor_set_property (GObject *object,
                                    guint property_id,
                                    const GValue *value,
                                    GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_REGISTRY:
            mail_signature_editor_set_registry (
                E_MAIL_SIGNATURE_EDITOR (object),
                g_value_get_object (value));
            return;

        case PROP_SOURCE:
            mail_signature_editor_set_source (
                E_MAIL_SIGNATURE_EDITOR (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_signature_editor_get_property (GObject *object,
                                    guint property_id,
                                    GValue *value,
                                    GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_EDITOR:
            g_value_set_object (
                value,
                e_mail_signature_editor_get_editor (
                E_MAIL_SIGNATURE_EDITOR (object)));
            return;

        case PROP_FOCUS_TRACKER:
            g_value_set_object (
                value,
                e_mail_signature_editor_get_focus_tracker (
                E_MAIL_SIGNATURE_EDITOR (object)));
            return;

        case PROP_REGISTRY:
            g_value_set_object (
                value,
                e_mail_signature_editor_get_registry (
                E_MAIL_SIGNATURE_EDITOR (object)));
            return;

        case PROP_SOURCE:
            g_value_set_object (
                value,
                e_mail_signature_editor_get_source (
                E_MAIL_SIGNATURE_EDITOR (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_signature_editor_dispose (GObject *object)
{
    EMailSignatureEditorPrivate *priv;

    priv = E_MAIL_SIGNATURE_EDITOR_GET_PRIVATE (object);

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

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

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

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

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

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

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

static void
mail_signature_editor_finalize (GObject *object)
{
    EMailSignatureEditorPrivate *priv;

    priv = E_MAIL_SIGNATURE_EDITOR_GET_PRIVATE (object);

    g_free (priv->original_name);

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

static void
mail_signature_editor_constructed (GObject *object)
{
    EMailSignatureEditor *window;
    GtkActionGroup *action_group;
    EFocusTracker *focus_tracker;
    EHTMLEditor *editor;
    EHTMLEditorView *view;
    GtkUIManager *ui_manager;
    GDBusObject *dbus_object;
    ESource *source;
    GtkAction *action;
    GtkWidget *container;
    GtkWidget *widget;
    GtkWidget *hbox;
    const gchar *display_name;
    GError *error = NULL;

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

    window = E_MAIL_SIGNATURE_EDITOR (object);
    editor = e_mail_signature_editor_get_editor (window);
    view = e_html_editor_get_view (editor);

    ui_manager = e_html_editor_get_ui_manager (editor);

    /* Because we are loading from a hard-coded string, there is
     * no chance of I/O errors.  Failure here implies a malformed
     * UI definition.  Full stop. */
    gtk_ui_manager_add_ui_from_string (ui_manager, ui, -1, &error);
    if (error != NULL)
        g_error ("%s", error->message);

    action_group = gtk_action_group_new ("signature");
    gtk_action_group_set_translation_domain (
        action_group, GETTEXT_PACKAGE);
    gtk_action_group_add_actions (
        action_group, entries,
        G_N_ELEMENTS (entries), window);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    window->priv->action_group = g_object_ref (action_group);

    /* Hide page properties because it is not inherited in the mail. */
    action = e_html_editor_get_action (editor, "properties-page");
    gtk_action_set_visible (action, FALSE);

    action = e_html_editor_get_action (editor, "context-properties-page");
    gtk_action_set_visible (action, FALSE);

    gtk_ui_manager_ensure_update (ui_manager);

    gtk_window_set_title (GTK_WINDOW (window), _("Edit Signature"));
    gtk_window_set_default_size (GTK_WINDOW (window), 600, 440);

    widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
    gtk_container_add (GTK_CONTAINER (window), widget);
    gtk_widget_show (widget);

    container = widget;

    /* Construct the main menu and toolbar. */

    widget = e_html_editor_get_managed_widget (editor, "/main-menu");
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = e_html_editor_get_managed_widget (editor, "/main-toolbar");
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    /* Construct the signature name entry. */

    widget = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
    gtk_container_set_border_width (GTK_CONTAINER (widget), 6);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    hbox = widget;

    widget = gtk_entry_new ();
    gtk_box_pack_end (GTK_BOX (hbox), widget, TRUE, TRUE, 0);
    window->priv->entry = widget;  /* not referenced */
    gtk_widget_show (widget);

    widget = gtk_label_new_with_mnemonic (_("_Signature Name:"));
    gtk_label_set_mnemonic_widget (GTK_LABEL (widget), window->priv->entry);
    gtk_box_pack_end (GTK_BOX (hbox), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    /* Construct the main editing area. */

    widget = GTK_WIDGET (editor);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    gtk_widget_show (widget);

    g_signal_connect (
        window, "delete-event",
        G_CALLBACK (mail_signature_editor_delete_event_cb), NULL);

    /* Configure an EFocusTracker to manage selection actions. */
    focus_tracker = e_focus_tracker_new (GTK_WINDOW (window));

    action = e_html_editor_get_action (editor, "cut");
    e_focus_tracker_set_cut_clipboard_action (focus_tracker, action);

    action = e_html_editor_get_action (editor, "copy");
    e_focus_tracker_set_copy_clipboard_action (focus_tracker, action);

    action = e_html_editor_get_action (editor, "paste");
    e_focus_tracker_set_paste_clipboard_action (focus_tracker, action);

    action = e_html_editor_get_action (editor, "select-all");
    e_focus_tracker_set_select_all_action (focus_tracker, action);

    window->priv->focus_tracker = focus_tracker;

    source = e_mail_signature_editor_get_source (window);

    display_name = e_source_get_display_name (source);
    if (display_name == NULL || *display_name == '\0')
        display_name = _("Unnamed");

    /* Set the entry text before we grab focus. */
    g_free (window->priv->original_name);
    window->priv->original_name = g_strdup (display_name);
    gtk_entry_set_text (GTK_ENTRY (window->priv->entry), display_name);

    /* Set the focus appropriately.  If this is a new signature, draw
     * the user's attention to the signature name entry.  Otherwise go
     * straight to the editing area. */
    if (source == NULL) {
        gtk_widget_grab_focus (window->priv->entry);
    } else {
        gtk_widget_grab_focus (GTK_WIDGET (view));
    }

    /* Load file content only for an existing signature.
     * (A new signature will not yet have a GDBusObject.) */
    dbus_object = e_source_ref_dbus_object (source);
    if (dbus_object != NULL) {
        GCancellable *cancellable;

        cancellable = g_cancellable_new ();

        e_source_mail_signature_load (
            source,
            G_PRIORITY_DEFAULT,
            cancellable,
            mail_signature_editor_loaded_cb,
            g_object_ref (window));

        g_warn_if_fail (window->priv->cancellable == NULL);
        window->priv->cancellable = cancellable;

        g_object_unref (dbus_object);
    }
}

static void
e_mail_signature_editor_class_init (EMailSignatureEditorClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (class, sizeof (EMailSignatureEditorPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = mail_signature_editor_set_property;
    object_class->get_property = mail_signature_editor_get_property;
    object_class->dispose = mail_signature_editor_dispose;
    object_class->finalize = mail_signature_editor_finalize;
    object_class->constructed = mail_signature_editor_constructed;

    g_object_class_install_property (
        object_class,
        PROP_EDITOR,
        g_param_spec_object (
            "editor",
            NULL,
            NULL,
            E_TYPE_HTML_EDITOR,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_FOCUS_TRACKER,
        g_param_spec_object (
            "focus-tracker",
            NULL,
            NULL,
            E_TYPE_FOCUS_TRACKER,
            G_PARAM_READABLE |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_REGISTRY,
        g_param_spec_object (
            "registry",
            "Registry",
            "Data source registry",
            E_TYPE_SOURCE_REGISTRY,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));

    g_object_class_install_property (
        object_class,
        PROP_SOURCE,
        g_param_spec_object (
            "source",
            NULL,
            NULL,
            E_TYPE_SOURCE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY |
            G_PARAM_STATIC_STRINGS));
}

static void
e_mail_signature_editor_init (EMailSignatureEditor *editor)
{
    editor->priv = E_MAIL_SIGNATURE_EDITOR_GET_PRIVATE (editor);

    editor->priv->editor = g_object_ref_sink (e_html_editor_new ());
}

GtkWidget *
e_mail_signature_editor_new (ESourceRegistry *registry,
                             ESource *source)
{
    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

    if (source != NULL)
        g_return_val_if_fail (E_IS_SOURCE (source), NULL);

    return g_object_new (
        E_TYPE_MAIL_SIGNATURE_EDITOR,
        "registry", registry,
        "source", source, NULL);
}

EHTMLEditor *
e_mail_signature_editor_get_editor (EMailSignatureEditor *editor)
{
    g_return_val_if_fail (E_IS_MAIL_SIGNATURE_EDITOR (editor), NULL);

    return editor->priv->editor;
}

EFocusTracker *
e_mail_signature_editor_get_focus_tracker (EMailSignatureEditor *editor)
{
    g_return_val_if_fail (E_IS_MAIL_SIGNATURE_EDITOR (editor), NULL);

    return editor->priv->focus_tracker;
}

ESourceRegistry *
e_mail_signature_editor_get_registry (EMailSignatureEditor *editor)
{
    g_return_val_if_fail (E_IS_MAIL_SIGNATURE_EDITOR (editor), NULL);

    return editor->priv->registry;
}

ESource *
e_mail_signature_editor_get_source (EMailSignatureEditor *editor)
{
    g_return_val_if_fail (E_IS_MAIL_SIGNATURE_EDITOR (editor), NULL);

    return editor->priv->source;
}

/********************** e_mail_signature_editor_commit() *********************/

static void
mail_signature_editor_replace_cb (GObject *object,
                                  GAsyncResult *result,
                                  gpointer user_data)
{
    GSimpleAsyncResult *simple;
    GError *error = NULL;

    simple = G_SIMPLE_ASYNC_RESULT (user_data);

    e_source_mail_signature_replace_finish (
        E_SOURCE (object), result, &error);

    if (error != NULL)
        g_simple_async_result_take_error (simple, error);

    g_simple_async_result_complete (simple);

    g_object_unref (simple);
}

static void
mail_signature_editor_commit_cb (GObject *object,
                                 GAsyncResult *result,
                                 gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;
    GError *error = NULL;

    simple = G_SIMPLE_ASYNC_RESULT (user_data);
    async_context = g_simple_async_result_get_op_res_gpointer (simple);

    e_source_registry_commit_source_finish (
        E_SOURCE_REGISTRY (object), result, &error);

    if (error != NULL) {
        g_simple_async_result_take_error (simple, error);
        g_simple_async_result_complete (simple);
        g_object_unref (simple);
        return;
    }

    /* We can call this on our scratch source because only its UID is
     * really needed, which even a new scratch source already knows. */
    e_source_mail_signature_replace (
        async_context->source,
        async_context->contents,
        async_context->length,
        G_PRIORITY_DEFAULT,
        async_context->cancellable,
        mail_signature_editor_replace_cb,
        simple);
}

void
e_mail_signature_editor_commit (EMailSignatureEditor *window,
                                GCancellable *cancellable,
                                GAsyncReadyCallback callback,
                                gpointer user_data)
{
    GSimpleAsyncResult *simple;
    AsyncContext *async_context;
    ESourceMailSignature *extension;
    ESourceRegistry *registry;
    ESource *source;
    const gchar *extension_name;
    const gchar *mime_type;
    gchar *contents;
    EHTMLEditor *editor;
    EHTMLEditorView *view;

    g_return_if_fail (E_IS_MAIL_SIGNATURE_EDITOR (window));

    registry = e_mail_signature_editor_get_registry (window);
    source = e_mail_signature_editor_get_source (window);

    editor = e_mail_signature_editor_get_editor (window);
    view = e_html_editor_get_view (editor);

    if (e_html_editor_view_get_html_mode (view)) {
        mime_type = "text/html";
        contents = e_html_editor_view_get_text_html (view);
    } else {
        mime_type = "text/plain";
        contents = e_html_editor_view_get_text_plain (view);
    }

    extension_name = E_SOURCE_EXTENSION_MAIL_SIGNATURE;
    extension = e_source_get_extension (source, extension_name);
    e_source_mail_signature_set_mime_type (extension, mime_type);

    async_context = g_slice_new0 (AsyncContext);
    async_context->source = g_object_ref (source);
    async_context->contents = contents;  /* takes ownership */
    async_context->length = strlen (contents);

    if (G_IS_CANCELLABLE (cancellable))
        async_context->cancellable = g_object_ref (cancellable);

    simple = g_simple_async_result_new (
        G_OBJECT (window), callback, user_data,
        e_mail_signature_editor_commit);

    g_simple_async_result_set_op_res_gpointer (
        simple, async_context, (GDestroyNotify) async_context_free);

    e_source_registry_commit_source (
        registry, source,
        async_context->cancellable,
        mail_signature_editor_commit_cb,
        simple);
}

gboolean
e_mail_signature_editor_commit_finish (EMailSignatureEditor *editor,
                                       GAsyncResult *result,
                                       GError **error)
{
    GSimpleAsyncResult *simple;

    g_return_val_if_fail (
        g_simple_async_result_is_valid (
        result, G_OBJECT (editor),
        e_mail_signature_editor_commit), FALSE);

    simple = G_SIMPLE_ASYNC_RESULT (result);

    /* Assume success unless a GError is set. */
    return !g_simple_async_result_propagate_error (simple, error);
}