[gnome-builder] libide/gui: add hooks to save session state from addins

[Christian Hergert <chergert src gnome org>]

commit 158e148721188a1725a4694cc0fba33b50280b6d
Author: Christian Hergert <chergert redhat com>
Date:   Wed Sep 14 16:58:00 2022 -0700

    libide/gui: add hooks to save session state from addins
    
    We don't actually do anything with this object yet, but the goal here is
    for it to be saved to the project state directory eventually.

 src/libide/gui/ide-workbench.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
---
diff --git a/src/libide/gui/ide-workbench.c b/src/libide/gui/ide-workbench.c
index 66581fbaa..84d110f73 100644
--- a/src/libide/gui/ide-workbench.c
+++ b/src/libide/gui/ide-workbench.c
@@ -1650,6 +1650,25 @@ ide_workbench_unload_project_cb (GObject      *object,
   IDE_EXIT;
 }
 
+static void
+ide_workbench_addin_save_state_cb (PeasExtensionSet *set,
+                                   PeasPluginInfo   *plugin_info,
+                                   PeasExtension    *exten,
+                                   gpointer          user_data)
+{
+  IdeWorkbenchAddin *addin = (IdeWorkbenchAddin *)exten;
+  IdeSession *session = user_data;
+
+  g_assert (PEAS_IS_EXTENSION_SET (set));
+  g_assert (plugin_info != NULL);
+  g_assert (PEAS_IS_EXTENSION (exten));
+  g_assert (IDE_IS_SESSION (session));
+
+  g_debug ("Requesting session state from %s", G_OBJECT_TYPE_NAME (addin));
+
+  ide_workbench_addin_save_session (addin, session);
+}
+
 /**
  * ide_workbench_unload_async:
  * @self: an #IdeWorkbench
@@ -1670,6 +1689,7 @@ ide_workbench_unload_async (IdeWorkbench        *self,
 {
   g_autoptr(IdeTask) task = NULL;
   g_autoptr(GPtrArray) addins = NULL;
+  g_autoptr(IdeSession) session = NULL;
   GApplication *app;
 
   IDE_ENTRY;
@@ -1697,6 +1717,18 @@ ide_workbench_unload_async (IdeWorkbench        *self,
                            G_CONNECT_SWAPPED);
   g_application_hold (app);
 
+  /* If we have a project open, we want to save session state that
+   * can be restored the next time Builder is started.
+   */
+  if (self->project_info != NULL)
+    {
+      session = ide_session_new ();
+
+      peas_extension_set_foreach (self->addins,
+                                  ide_workbench_addin_save_state_cb,
+                                  session);
+    }
+
   /* Release the search engine early to help it cleanup */
   ide_clear_and_destroy_object (&self->search_engine);