load installed fonts, fix some minor loading issues

__init__.py

@@ -262,11 +262,16 @@ class ABC3D_PT_Panel(bpy.types.Panel):
     def draw(self, context):
         layout = self.layout
 
-        layout.label(text=f"{__name__} panel")
+        icon = 'NONE'
+        if len(context.scene.abc3d_data.available_fonts) == 0:
+            icon = 'ERROR'
+            layout.row().label(text='no fonts loaded yet')
+
+        layout.operator(f"{__name__}.load_installed_fonts", text="load installed fonts", icon=icon)
 
 
 class ABC3D_PT_LoadFontPanel(bpy.types.Panel):
-    bl_label = "Load a new font"
+    bl_label = "Install a new font"
     bl_parent_id = "ABC3D_PT_Panel"
     bl_category = "ABC3D"
     bl_space_type = "VIEW_3D"
@@ -281,9 +286,9 @@ class ABC3D_PT_LoadFontPanel(bpy.types.Panel):
         abc3d = scene.abc3d
         abc3d_data = scene.abc3d_data
 
-        layout.label(text="Load FontFile:")
+        layout.label(text="Install FontFile:")
         layout.row().prop(abc3d, "font_path")
-        layout.row().operator('abc3d.loadfont', text='Load Font')
+        layout.row().operator(f"{__name__}.loadfont", text='Load Font')
 
 
 class ABC3D_PT_FontList(bpy.types.Panel):
@@ -497,13 +502,6 @@ class ABC3D_OT_LoadFont(bpy.types.Operator):
     def execute(self, context):
         scene = bpy.context.scene
 
-        butils.ShowMessageBox(
-            title=f"{__name__} Warning",
-            icon="ERROR",
-            message=f"We believe this functionality is currently not available.",
-            )
-        return {'CANCELLED'}
-
         if not os.path.exists(scene.abc3d.font_path):
             butils.ShowMessageBox(
                 title=f"{__name__} Warning",
@@ -516,6 +514,27 @@ class ABC3D_OT_LoadFont(bpy.types.Operator):
 
         return {'FINISHED'}
 
+class ABC3D_OT_LoadInstalledFonts(bpy.types.Operator):
+    """Load installed fontfiles from datapath."""
+    bl_idname = f"{__name__}.load_installed_fonts"
+    bl_label = "Loading installed Fonts."
+    bl_options = {'REGISTER', 'UNDO'}
+
+    def draw(self, context):
+        layout = self.layout
+        layout.label(text="Loading font files can take a long time.")
+
+    def invoke(self, context, event):
+        return context.window_manager.invoke_props_dialog(self)
+
+    def execute(self, context):
+        scene = bpy.context.scene
+
+        butils.load_installed_fonts()
+        butils.update_available_fonts()
+
+        return {'FINISHED'}
+
 class ABC3D_OT_AddDefaultMetrics(bpy.types.Operator):
     """Add default metrics to selected objects"""
     bl_idname = f"{__name__}.add_default_metrics"
@@ -735,9 +754,12 @@ class ABC3D_OT_SaveFontToFile(bpy.types.Operator):
         for obj in fontcollection.objects:
             if obj["font_name"] == selected_font.font_name:
                 if not butils.is_metrics_object(obj):
-                    # butils.add_faces_to_metrics(obj)
                     obj.select_set(True)
                     export_objects.append(obj)
+                else:
+                    obj.select_set(True)
+                    butils.add_faces_to_metrics(obj)
+                    export_objects.append(obj)
 
         context_override = bpy.context.copy()
         context_override["selected_objects"] = list(export_objects)
@@ -1019,6 +1041,7 @@ classes = (
             ABC3D_PT_TextManagement,
             ABC3D_PT_FontCreation,
             ABC3D_PT_TextPropertiesPanel,
+            ABC3D_OT_LoadInstalledFonts,
             ABC3D_OT_AddDefaultMetrics,
             ABC3D_OT_RemoveMetrics,
             ABC3D_OT_AlignMetricsToActiveObject,
@@ -1038,6 +1061,7 @@ def load_handler(self, dummy):
     if not bpy.app.timers.is_registered(butils.execute_queued_functions):
         bpy.app.timers.register(butils.execute_queued_functions)
         butils.run_in_main_thread(butils.update_available_fonts)
+        # butils.run_in_main_thread(bpy.ops.abc3d.load_installed_fonts)
 
 def load_handler_unload():
     if bpy.app.timers.is_registered(butils.execute_queued_functions):
@@ -1071,9 +1095,11 @@ def register():
         bpy.app.handlers.frame_change_post.append(on_frame_changed)
 
     butils.run_in_main_thread(butils.clear_available_fonts)
-    butils.run_in_main_thread(butils.load_available_fonts)
+    # butils.run_in_main_thread(butils.load_installed_fonts)
     butils.run_in_main_thread(butils.update_available_fonts)
 
+    # bpy.ops.abc3d.load_installed_fonts()
+
     Font.name_to_glyph_d = Font.generate_name_to_glyph_d()
 
 def unregister():