[gnome-text-editor] page: export language name as a property

[Christian Hergert <chergert src gnome org>]

commit 8ffc0b43475fc9173dc1f58852c646d89dbe495b
Author: Christian Hergert <chergert redhat com>
Date:   Tue Nov 30 11:05:34 2021 -0800

    page: export language name as a property
    
    This makes it easier to track to update UI as we can just notify on the
    property.

 src/editor-page.c | 31 +++++++++++++++++++++++++++++++
 src/editor-page.h |  1 +
 2 files changed, 32 insertions(+)
---
diff --git a/src/editor-page.c b/src/editor-page.c
index 64fb1e6..9a0f1bc 100644
--- a/src/editor-page.c
+++ b/src/editor-page.c
@@ -39,6 +39,7 @@ enum {
   PROP_CAN_SAVE,
   PROP_DOCUMENT,
   PROP_IS_MODIFIED,
+  PROP_LANGUAGE_NAME,
   PROP_POSITION_LABEL,
   PROP_SETTINGS,
   PROP_SUBTITLE,
@@ -154,6 +155,8 @@ editor_page_document_notify_language_cb (EditorPage     *self,
 
   settings = editor_page_settings_new_for_document (document);
   editor_page_set_settings (self, settings);
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_LANGUAGE_NAME]);
 }
 
 static void
@@ -465,6 +468,23 @@ font_scale_changed_cb (EditorPage       *self,
   g_object_notify_by_pspec (G_OBJECT (self), properties [PROP_ZOOM_LABEL]);
 }
 
+const char *
+editor_page_get_language_name (EditorPage *self)
+{
+  GtkSourceLanguage *language;
+  EditorDocument *document;
+
+  g_return_val_if_fail (EDITOR_IS_PAGE (self), NULL);
+
+  document = editor_page_get_document (self);
+  language = gtk_source_buffer_get_language (GTK_SOURCE_BUFFER (document));
+
+  if (language != NULL)
+    return gtk_source_language_get_name (language);
+
+  return NULL;
+}
+
 static void
 editor_page_dispose (GObject *object)
 {
@@ -516,6 +536,10 @@ editor_page_get_property (GObject    *object,
       g_value_set_boolean (value, editor_page_get_is_modified (self));
       break;
 
+    case PROP_LANGUAGE_NAME:
+      g_value_set_string (value, editor_page_get_language_name (self));
+      break;
+
     case PROP_TITLE:
       g_value_take_string (value, editor_page_dup_title (self));
       break;
@@ -593,6 +617,13 @@ editor_page_class_init (EditorPageClass *klass)
                          EDITOR_TYPE_DOCUMENT,
                          (G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
 
+  properties [PROP_LANGUAGE_NAME] =
+    g_param_spec_string ("language-name",
+                         "Language Name",
+                         "Language Name",
+                         NULL,
+                         (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
+
   properties [PROP_TITLE] =
     g_param_spec_string ("title",
                          "Title",
diff --git a/src/editor-page.h b/src/editor-page.h
index c3b8c28..52912a2 100644
--- a/src/editor-page.h
+++ b/src/editor-page.h
@@ -43,5 +43,6 @@ gchar          *editor_page_dup_position_label  (EditorPage     *self);
 void            editor_page_get_visual_position (EditorPage     *self,
                                                  guint          *line,
                                                  guint          *column);
+const char     *editor_page_get_language_name   (EditorPage     *self);
 
 G_END_DECLS