[gnome-builder] app: add helper to print type counts

[Christian Hergert <chergert src gnome org>]

commit 761aad71fde515ff27472d3b55a379dfba5c667a
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jun 10 20:12:28 2018 -0700

    app: add helper to print type counts
    
    Using the statistics page of the inspector requires loading lots of types
    that skew what we want to debug. So this allows us to get at that info
    without having to do too much extra work.

 src/libide/application/ide-application-actions.c | 39 ++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
---
diff --git a/src/libide/application/ide-application-actions.c 
b/src/libide/application/ide-application-actions.c
index 1058e581d..2698cece5 100644
--- a/src/libide/application/ide-application-actions.c
+++ b/src/libide/application/ide-application-actions.c
@@ -423,7 +423,46 @@ ide_application_actions_load_flatpak (GSimpleAction *action,
   ide_application_actions_load_workbench_view (self, "GbpFlatpakGenesisAddin", manifest);
 }
 
+static gint
+type_compare (gconstpointer a,
+              gconstpointer b)
+{
+  GType *ta = (GType *)a;
+  GType *tb = (GType *)b;
+
+  return g_type_get_instance_count (*ta) - g_type_get_instance_count (*tb);
+}
+
+static void
+ide_application_actions_stats (GSimpleAction *action,
+                               GVariant *args,
+                               gpointer user_data)
+{
+  guint n_types = 0;
+  g_autofree GType *types = g_type_children (G_TYPE_OBJECT, &n_types);
+  gboolean found = FALSE;
+
+  g_printerr ("Type Counts\n");
+
+  qsort (types, n_types, sizeof (GType), type_compare);
+
+  for (guint i = 0; i < n_types; i++)
+    {
+      gint count = g_type_get_instance_count (types[i]);
+
+      if (count)
+        {
+          found = TRUE;
+          g_printerr ("  %60s : %d\n", g_type_name (types[i]), g_type_get_instance_count (types[i]));
+        }
+    }
+
+  if (!found)
+    g_printerr ("No stats were found, was GOBJECT_DEBUG=instance-count set?\n");
+}
+
 static const GActionEntry IdeApplicationActions[] = {
+  { "about:types",  ide_application_actions_stats },
   { "about",        ide_application_actions_about },
   { "clone",        ide_application_actions_clone },
   { "dayhack",      ide_application_actions_dayhack },