[feature] unload glyphs and refresh fonts

__init__.py

@@ -383,7 +383,10 @@ class ABC3D_PT_FontList(bpy.types.Panel):
             abc3d_data,
             "active_font_index",
         )
-        if abc3d_data.active_font_index >= 0:
+        if (
+            abc3d_data.active_font_index >= 0
+            and len(abc3d_data.available_fonts) > abc3d_data.active_font_index
+        ):
             available_font = abc3d_data.available_fonts[abc3d_data.active_font_index]
             font_name = available_font.font_name
             face_name = available_font.face_name
@@ -432,6 +435,15 @@ class ABC3D_PT_FontList(bpy.types.Panel):
                 )
                 oper_lf.font_name = font_name
                 oper_lf.face_name = face_name
+        box = layout.box()
+        row = box.row()
+        row.label(text="File and Memory optimization")
+        row = box.row()
+        row.operator(f"{__name__}.refresh_fonts", text="Refresh Font list from disk")
+        row = box.row()
+        row.operator(
+            f"{__name__}.unload_unused_glyphs", text="Unload unused glyphs from memory"
+        )
 
 
 class ABC3D_PT_TextPlacement(bpy.types.Panel):
@@ -773,33 +785,6 @@ class ABC3D_PT_TextPropertiesPanel(bpy.types.Panel):
                                 return g
         return None
 
-    # def font_items_callback(self, context):
-    # items = []
-    # fonts = Font.get_loaded_fonts_and_faces()
-    # for f in fonts:
-    # items.append((f"{f[0]} {f[1]}", f"{f[0]} {f[1]}", ""))
-    # return items
-
-    # def font_default_callback(self, context):
-    # t = self.get_active_text_properties(self)
-    # if type(t) != type(None):
-    # return f"{t.font_name} {t.face_name}"
-    # else:
-    # return None
-
-    # def font_update_callback(self, context):
-    # font_name, face_name = self.font.split(" ")
-    # t = self.get_active_text_properties(self)
-    # t.font_name = font_name
-    # t.face_name = face_name
-    # butils.set_text_on_curve(t)
-
-    # font: bpy.props.EnumProperty(
-    # items=font_items_callback,
-    # default=font_default_callback,
-    # update=font_update_callback,
-    # )
-
     @classmethod
     def poll(self, context):
         try:
@@ -843,6 +828,33 @@ class ABC3D_PT_TextPropertiesPanel(bpy.types.Panel):
         box.row().prop(glyph_props, "letter_spacing")
 
 
+class ABC3D_OT_RefreshAvailableFonts(bpy.types.Operator):
+    """Refreshes available font list from disk.
+    This also removes all fonts which are not saved in the asset directory.
+    Can be useful when creating fonts or manually installing fonts."""
+
+    bl_idname = f"{__name__}.refresh_fonts"
+    bl_label = "Refresh Available Fonts"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        refresh_fonts()
+        return {"FINISHED"}
+
+
+class ABC3D_OT_UnloadUnusedGlyphs(bpy.types.Operator):
+    """Unload all glyphs which are not actively used in this project from memory.
+    They will still be normally loaded when you use them again."""
+
+    bl_idname = f"{__name__}.unload_unused_glyphs"
+    bl_label = "Unload Unused Glyphs"
+    bl_options = {"REGISTER", "UNDO"}
+
+    def execute(self, context):
+        butils.unload_unused_glyphs()
+        return {"FINISHED"}
+
+
 class ABC3D_OT_InstallFont(bpy.types.Operator):
     """Install or load Fontfile from path above.
     (Format must be *.glb or *.gltf)"""
@@ -1851,6 +1863,8 @@ classes = (
     ABC3D_PT_NamingHelper,
     ABC3D_PT_TextPropertiesPanel,
     ABC3D_OT_OpenAssetDirectory,
+    ABC3D_OT_RefreshAvailableFonts,
+    ABC3D_OT_UnloadUnusedGlyphs,
     ABC3D_OT_LoadInstalledFonts,
     ABC3D_OT_LoadFont,
     ABC3D_OT_AddDefaultMetrics,
@@ -1954,6 +1968,21 @@ def load_used_glyphs():
                 butils.load_font_from_filepath(fp, a.unloaded)
 
 
+def refresh_fonts():
+    fontcollection: bpy_types.Collection = bpy.data.collections.get("ABC3D")
+    if fontcollection is not None:
+        objs = [o for o in fontcollection.objects if o.parent == None]
+        butils.completely_delete_objects(objs)
+    butils.run_in_main_thread(Font.fonts.clear)
+    butils.run_in_main_thread(butils.clear_available_fonts)
+    butils.run_in_main_thread(butils.register_installed_fonts)
+    butils.run_in_main_thread(butils.update_available_fonts)
+    butils.run_in_main_thread(load_used_glyphs)
+    butils.run_in_main_thread(butils.update_types)
+    butils.run_in_main_thread(detect_text)
+    butils.run_in_main_thread(butils.unload_unused_glyphs)
+
+
 @persistent
 def load_handler(self, dummy):
     if not bpy.app.timers.is_registered(butils.execute_queued_functions):