sysprof/greeter: load/save recording template for persistence

This sets things up to save the state to disk if the greeter suceeded at
creating a profiler instance so that it may be used again on the next
run. Additionally, when loading the greeter it attempts to load from disk
the saved state.

We may want to extend this in the future to allow using sysprof-cli with
a recording template instead of command line options.

src/sysprof/sysprof-greeter.c

@@ -41,6 +41,7 @@ struct _SysprofGreeter
   AdwWindow                 parent_instance;
 
   GtkStringList            *envvars;
+  SysprofRecordingTemplate *recording_template;
 
   AdwViewStack             *view_stack;
   GtkListBox               *sidebar_list_box;
@@ -60,10 +61,35 @@ struct _SysprofGreeter
   AdwComboRow              *sample_user_stack_size;
   AdwExpanderRow           *user_stacks;
   GtkLabel                 *user_stacks_caption;
-  SysprofRecordingTemplate *recording_template;
 };
 
-G_DEFINE_FINAL_TYPE (SysprofGreeter, sysprof_greeter, ADW_TYPE_WINDOW)
+static GFile *
+get_state_file (void)
+{
+  return g_file_new_build_filename (g_get_user_data_dir (), APP_ID_S, "recording-template.json", NULL);
+}
+
+static GObject *
+sysprof_greeter_get_internal_child (GtkBuildable *buildable,
+                                    GtkBuilder   *builder,
+                                    const char   *name)
+{
+  SysprofGreeter *self = SYSPROF_GREETER (buildable);
+
+  if (g_strcmp0 (name, "template") == 0)
+    return G_OBJECT (self->recording_template);
+
+  return NULL;
+}
+
+static void
+buildable_iface_init (GtkBuildableIface *iface)
+{
+  iface->get_internal_child = sysprof_greeter_get_internal_child;
+}
+
+G_DEFINE_FINAL_TYPE_WITH_CODE (SysprofGreeter, sysprof_greeter, ADW_TYPE_WINDOW,
+                               G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, buildable_iface_init))
 
 #define STRV_INIT(...) (const char * const[]){__VA_ARGS__,NULL}
 
@@ -179,6 +205,8 @@ sysprof_greeter_create_profiler (SysprofGreeter  *self,
                                  GError         **error)
 {
   g_autoptr(SysprofProfiler) profiler = NULL;
+  g_autoptr(GFile) state_file = NULL;
+  g_autoptr(GFile) dir = NULL;
   GtkStringObject *strobj;
   const char *str;
 
@@ -193,6 +221,17 @@ sysprof_greeter_create_profiler (SysprofGreeter  *self,
   if (!(profiler = sysprof_recording_template_apply (self->recording_template, error)))
     return NULL;
 
+  state_file = get_state_file ();
+  dir = g_file_get_parent (state_file);
+
+  if (!g_file_query_exists (dir, NULL))
+    {
+      const char *path = g_file_peek_path (dir);
+      g_mkdir_with_parents (path, 0750);
+    }
+
+  sysprof_recording_template_save (self->recording_template, state_file, NULL);
+
   return g_steal_pointer (&profiler);
 }
 
@@ -487,6 +526,7 @@ sysprof_greeter_dispose (GObject *object)
   gtk_widget_dispose_template (GTK_WIDGET (self), SYSPROF_TYPE_GREETER);
 
   g_clear_object (&self->envvars);
+  g_clear_object (&self->recording_template);
 
   G_OBJECT_CLASS (sysprof_greeter_parent_class)->dispose (object);
 }
@@ -513,7 +553,6 @@ sysprof_greeter_class_init (SysprofGreeterClass *klass)
   gtk_widget_class_bind_template_child (widget_class, SysprofGreeter, record_system_bus);
   gtk_widget_class_bind_template_child (widget_class, SysprofGreeter, record_system_logs);
   gtk_widget_class_bind_template_child (widget_class, SysprofGreeter, record_to_memory);
-  gtk_widget_class_bind_template_child (widget_class, SysprofGreeter, recording_template);
   gtk_widget_class_bind_template_child (widget_class, SysprofGreeter, sample_javascript_stacks);
   gtk_widget_class_bind_template_child (widget_class, SysprofGreeter, sample_native_stacks);
   gtk_widget_class_bind_template_child (widget_class, SysprofGreeter, sample_user_stack_size);
@@ -541,8 +580,12 @@ static void
 sysprof_greeter_init (SysprofGreeter *self)
 {
   g_autoptr(GListModel) power_profiles = sysprof_power_profiles_new ();
+  g_autoptr(GFile) state_file = get_state_file ();
   GtkListBoxRow *row;
 
+  if (!(self->recording_template = sysprof_recording_template_new_from_file (state_file, NULL)))
+    self->recording_template = sysprof_recording_template_new ();
+
   gtk_widget_init_template (GTK_WIDGET (self));
 
   adw_combo_row_set_model (self->power_combo, power_profiles);

src/sysprof/sysprof-greeter.ui

@@ -666,6 +666,10 @@
         </child>
       </object>
     </property>
+    <child internal-child="template">
+      <object class="SysprofRecordingTemplate" id="recording_template">
+      </object>
+    </child>
   </template>
   <menu id="primary_menu">
     <section>
@@ -695,8 +699,6 @@
       </item>
     </section>
   </menu>
-  <object class="SysprofRecordingTemplate" id="recording_template">
-  </object>
   <object class="GtkStringList" id="envvars">
   </object>
   <object class="GListStore" id="stack_sizes">