fix: add error report for invalid file path when importing or exporting virtools file.

- add error report for invalid file path when importing or exporting virtools to avoid BMapException was thrown. Reported by SongRui

assets/jsons/1x1.json5

@@ -84,6 +84,7 @@
         "identifier": "floor_normal_1x1",
         "showcase": {
             "title": "Normal 1x1",
+            "category": "1x1 Blocks",
             "icon": "Normal1x1",
             "type": "floor",
             "cfgs": [
@@ -134,6 +135,7 @@
         "identifier": "floor_sink_1x1",
         "showcase": {
             "title": "Sink 1x1",
+            "category": "1x1 Blocks",
             "icon": "Sink1x1",
             "type": "floor",
             "cfgs": [

assets/jsons/borders.json5

@@ -49,6 +49,7 @@
         "identifier": "floor_normal_border",
         "showcase": {
             "title": "Normal Border",
+            "category": "Borders",
             "icon": "NormalBorder",
             "type": "floor",
             "cfgs": [
@@ -112,6 +113,7 @@
         "identifier": "floor_sink_border",
         "showcase": {
             "title": "Sink Border",
+            "category": "Borders",
             "icon": "SinkBorder",
             "type": "floor",
             "cfgs": [
@@ -175,6 +177,7 @@
         "identifier": "floor_ribbon_border",
         "showcase": {
             "title": "Ribbon Border",
+            "category": "Borders",
             "icon": "RibbonBorder",
             "type": "floor",
             "cfgs": [

assets/jsons/corners.json5

@@ -149,6 +149,7 @@
         "identifier": "floor_normal_inner_corner",
         "showcase": {
             "title": "Normal Inner Corner",
+            "category": "Half Block Corners",
             "icon": "NormalInnerCorner",
             "type": "floor",
             "cfgs": [
@@ -201,6 +202,7 @@
         "identifier": "floor_sink_inner_corner",
         "showcase": {
             "title": "Sink Inner Corner",
+            "category": "Half Block Corners",
             "icon": "SinkInnerCorner",
             "type": "floor",
             "cfgs": [
@@ -253,6 +255,7 @@
         "identifier": "floor_ribbon_inner_corner",
         "showcase": {
             "title": "Ribbon Inner Corner",
+            "category": "Half Block Corners",
             "icon": "RibbonInnerCorner",
             "type": "floor",
             "cfgs": [
@@ -305,6 +308,7 @@
         "identifier": "floor_normal_outter_corner",
         "showcase": {
             "title": "Normal Outter Corner",
+            "category": "Half Block Corners",
             "icon": "NormalOutterCorner",
             "type": "floor",
             "cfgs": [
@@ -357,6 +361,7 @@
         "identifier": "floor_sink_outter_corner",
         "showcase": {
             "title": "Sink Outter Corner",
+            "category": "Half Block Corners",
             "icon": "SinkOutterCorner",
             "type": "floor",
             "cfgs": [
@@ -409,6 +414,7 @@
         "identifier": "floor_ribbon_outter_corner",
         "showcase": {
             "title": "Ribbon Outter Corner",
+            "category": "Half Block Corners",
             "icon": "RibbonOutterCorner",
             "type": "floor",
             "cfgs": [

assets/jsons/crossings.json5

@@ -228,6 +228,7 @@
         "identifier": "floor_normal_l_crossing",
         "showcase": {
             "title": "Normal L Crossing",
+            "category": "Floor Crossings",
             "icon": "NormalLCrossing",
             "type": "floor",
             "cfgs": [
@@ -278,6 +279,7 @@
         "identifier": "floor_sink_l_crossing",
         "showcase": {
             "title": "Sink L Crossing",
+            "category": "Floor Crossings",
             "icon": "SinkLCrossing",
             "type": "floor",
             "cfgs": [
@@ -328,6 +330,7 @@
         "identifier": "floor_normal_t_crossing",
         "showcase": {
             "title": "Normal T Crossing",
+            "category": "Floor Crossings",
             "icon": "NormalTCrossing",
             "type": "floor",
             "cfgs": [
@@ -378,6 +381,7 @@
         "identifier": "floor_sink_t_crossing",
         "showcase": {
             "title": "Sink T Crossing",
+            "category": "Floor Crossings",
             "icon": "SinkTCrossing",
             "type": "floor",
             "cfgs": [
@@ -428,6 +432,7 @@
         "identifier": "floor_normal_x_crossing",
         "showcase": {
             "title": "Normal X Crossing",
+            "category": "Floor Crossings",
             "icon": "NormalXCrossing",
             "type": "floor",
             "cfgs": [
@@ -478,6 +483,7 @@
         "identifier": "floor_sink_x_crossing",
         "showcase": {
             "title": "Sink X Crossing",
+            "category": "Floor Crossings",
             "icon": "SinkXCrossing",
             "type": "floor",
             "cfgs": [

assets/jsons/flat.json5

@@ -3,6 +3,7 @@
         "identifier": "floor_flat",
         "showcase": {
             "title": "Flat",
+            "category": "Miscellaneous",
             "icon": "Flat",
             "type": "floor",
             "cfgs": [

assets/jsons/platforms.json5

@@ -116,6 +116,7 @@
         "identifier": "floor_normal_platform",
         "showcase": {
             "title": "Normal Platform",
+            "category": "Platforms",
             "icon": "NormalPlatform",
             "type": "floor",
             "cfgs": [
@@ -191,6 +192,7 @@
         "identifier": "floor_sink_platform",
         "showcase": {
             "title": "Sink Platform",
+            "category": "Platforms",
             "icon": "SinkPlatform",
             "type": "floor",
             "cfgs": [
@@ -266,6 +268,7 @@
         "identifier": "floor_ribbon_platform",
         "showcase": {
             "title": "Ribbon Platform",
+            "category": "Platforms",
             "icon": "RibbonPlatform",
             "type": "floor",
             "cfgs": [

assets/jsons/streets.json5

@@ -3,6 +3,7 @@
         "identifier": "floor_normal_straight",
         "showcase": {
             "title": "Normal Floor",
+            "category": "Floors",
             "icon": "NormalFloor",
             "type": "floor",
             "cfgs": [
@@ -142,6 +143,7 @@
         "identifier": "floor_sink_straight",
         "showcase": {
             "title": "Sink Floor",
+            "category": "Floors",
             "icon": "SinkFloor",
             "type": "floor",
             "cfgs": [

assets/jsons/terminals.json5

@@ -77,6 +77,7 @@
         "identifier": "floor_normal_terminal",
         "showcase": {
             "title": "Normal Floor Terminal",
+            "category": "Floors",
             "icon": "NormalFloorTerminal",
             "type": "floor",
             "cfgs": [
@@ -127,6 +128,7 @@
         "identifier": "floor_sink_terminal",
         "showcase": {
             "title": "Sink Floor Terminal",
+            "category": "Floors",
             "icon": "SinkFloorTerminal",
             "type": "floor",
             "cfgs": [

assets/jsons/trafos.json5

@@ -137,6 +137,7 @@
         "identifier": "wood_trafo",
         "showcase": {
             "title": "Wood Trafo",
+            "category": "Trafo",
             "icon": "WoodTrafo",
             "type": "floor",
             "cfgs": [
@@ -187,6 +188,7 @@
         "identifier": "stone_trafo",
         "showcase": {
             "title": "Stone Trafo",
+            "category": "Trafo",
             "icon": "StoneTrafo",
             "type": "floor",
             "cfgs": [
@@ -237,6 +239,7 @@
         "identifier": "paper_trafo",
         "showcase": {
             "title": "Paper Trafo",
+            "category": "Trafo",
             "icon": "PaperTrafo",
             "type": "floor",
             "cfgs": [

assets/jsons/transitions.json5

@@ -111,6 +111,7 @@
         "identifier": "floor_transition",
         "showcase": {
             "title": "Transition",
+            "category": "Miscellaneous",
             "icon": "Transition",
             "type": "floor",
             "cfgs": [
@@ -191,6 +192,7 @@
         "identifier": "floor_narrow_transition",
         "showcase": {
             "title": "Narrow Transition",
+            "category": "Miscellaneous",
             "icon": "NarrowTransition",
             "type": "floor",
             "cfgs": [

assets/jsons/wide_floors.json5

@@ -3,6 +3,7 @@
         "identifier": "floor_wide_straight",
         "showcase": {
             "title": "Wide Floor",
+            "category": "Wide Floors",
             "icon": "WideFloor",
             "type": "floor",
             "cfgs": [
@@ -106,6 +107,7 @@
         "identifier": "floor_wide_terminal",
         "showcase": {
             "title": "Wide Floor Terminal",
+            "category": "Wide Floors",
             "icon": "WideFloorTerminal",
             "type": "floor",
             "cfgs": [
@@ -220,6 +222,7 @@
         "identifier": "floor_wide_l_crossing",
         "showcase": {
             "title": "Wide Floor L Crossing",
+            "category": "Wide Floors",
             "icon": "WideLCrossing",
             "type": "floor",
             "cfgs": [
@@ -352,6 +355,7 @@
         "identifier": "floor_wide_t_crossing",
         "showcase": {
             "title": "Wide Floor T Crossing",
+            "category": "Wide Floors",
             "icon": "WideTCrossing",
             "type": "floor",
             "cfgs": [
@@ -475,6 +479,7 @@
         "identifier": "floor_wide_x_crossing",
         "showcase": {
             "title": "Wide Floor X Crossing",
+            "category": "Wide Floors",
             "icon": "WideXCrossing",
             "type": "floor",
             "cfgs": [

bbp_ng/OP_ADDS_bme.py

@@ -280,16 +280,24 @@ class BBP_OT_add_bme_struct(bpy.types.Operator):
 
     @classmethod
     def draw_blc_menu(cls, layout: bpy.types.UILayout):
-        for ident in _g_EnumHelper_BmeStructType.get_bme_identifiers():
+        for category, idents in _g_EnumHelper_BmeStructType.get_bme_categories().items():
-            # draw operator
+            # draw category label
-            cop = layout.operator(
+            layout.label(text=category, text_ctxt=UTIL_translation.build_prototype_showcase_category_context())
-                cls.bl_idname,
+
-                text = _g_EnumHelper_BmeStructType.get_bme_showcase_title(ident),
+            # draw prototypes list
-                icon_value = _g_EnumHelper_BmeStructType.get_bme_showcase_icon(ident),
+            for ident in idents:
-                text_ctxt = UTIL_translation.build_prototype_showcase_context(ident),
+                # draw operator
-            )
+                cop = layout.operator(
-            # and assign its init type value
+                    cls.bl_idname,
-            cop.bme_struct_type = _g_EnumHelper_BmeStructType.to_selection(ident)
+                    text = _g_EnumHelper_BmeStructType.get_bme_showcase_title(ident),
+                    icon_value = _g_EnumHelper_BmeStructType.get_bme_showcase_icon(ident),
+                    text_ctxt = UTIL_translation.build_prototype_showcase_title_context(ident),
+                )
+                # and assign its init type value
+                cop.bme_struct_type = _g_EnumHelper_BmeStructType.to_selection(ident)
+
+            # draw separator
+            layout.separator()
 
 #endregion
 

bbp_ng/OP_ADDS_rail.py

@@ -1,6 +1,6 @@
 import bpy, mathutils, math
 import typing
-from . import UTIL_rail_creator
+from . import UTIL_rail_creator, PROP_preferences
 
 ## Const Value Hint:
 #  Default Rail Radius: 0.35 (in measure)
@@ -233,6 +233,10 @@ class BBP_OT_add_rail_section(SharedRailSectionInputProperty, bpy.types.Operator
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_rail_section'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_rail_section(
@@ -254,6 +258,10 @@ class BBP_OT_add_transition_section(bpy.types.Operator):
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_transition_section'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_transition_section(bm, c_DefaultRailRadius, c_DefaultRailSpan),
@@ -272,6 +280,10 @@ class BBP_OT_add_straight_rail(SharedExtraTransform, SharedRailSectionInputPrope
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_straight_rail'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_straight_rail(
@@ -301,6 +313,10 @@ class BBP_OT_add_transition_rail(SharedExtraTransform, SharedRailCapInputPropert
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_transition_rail'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_transition_rail(
@@ -340,6 +356,10 @@ class BBP_OT_add_side_rail(SharedExtraTransform, SharedRailCapInputProperty, Sha
         translation_context = 'BBP_OT_add_side_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_straight_rail(
@@ -379,6 +399,10 @@ class BBP_OT_add_arc_rail(SharedExtraTransform, SharedRailSectionInputProperty,
         translation_context = 'BBP_OT_add_arc_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_screw_rail(
@@ -430,6 +454,10 @@ class BBP_OT_add_spiral_rail(SharedExtraTransform, SharedRailCapInputProperty, S
         translation_context = 'BBP_OT_add_spiral_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_screw_rail(
@@ -474,6 +502,10 @@ class BBP_OT_add_side_spiral_rail(SharedExtraTransform, SharedRailSectionInputPr
         translation_context = 'BBP_OT_add_side_spiral_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_screw_rail(

bbp_ng/OP_EXPORT_virtools.py

@@ -18,10 +18,16 @@ class BBP_OT_export_virtools(bpy.types.Operator, UTIL_file_browser.ExportVirtool
         return (
             PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
             and bmap.is_bmap_available())
+
+    def invoke(self, context, event):
+        # preset virtools encoding if possible
+        self.preset_vt_encodings_if_possible(context)
+        # call parent invoke function (same reason written in IMPORT module)
+        return super().invoke(context, event)
     
     def execute(self, context):
         # check selecting first
-        objls: tuple[bpy.types.Object] | None = self.general_get_export_objects(context)
+        objls: tuple[bpy.types.Object, ...] | None = self.general_get_export_objects(context)
         if objls is None:
             self.report({'ERROR'}, 'No selected target!')
             return {'CANCELLED'}
@@ -38,10 +44,16 @@ class BBP_OT_export_virtools(bpy.types.Operator, UTIL_file_browser.ExportVirtool
             self.report({'ERROR'}, 'You must specify at least one encoding for file saving (e.g. cp1252, gbk)!')
             return {'CANCELLED'}
 
+        # check file name
+        filename = self.general_get_filename()
+        if not os.path.isfile(filename):
+            self.report({'ERROR'}, 'No file was selected!')
+            return {'CANCELLED'}
+
         # start exporting
         with UTIL_ioport_shared.ExportEditModeBackup() as editmode_guard:
             _export_virtools(
-                self.general_get_filename(),
+                filename,
                 encodings,
                 texture_save_opt,
                 self.general_get_use_compress(),
@@ -68,7 +80,7 @@ _TTexturePair = tuple[bpy.types.Image, bmap.BMTexture]
 
 def _export_virtools(
         file_name_: str, 
-        encodings_: tuple[str], 
+        encodings_: tuple[str, ...], 
         texture_save_opt_: UTIL_virtools_types.CK_TEXTURE_SAVEOPTIONS,
         use_compress_: bool,
         compress_level_: int, 

bbp_ng/OP_IMPORT_virtools.py

@@ -18,6 +18,12 @@ class BBP_OT_import_virtools(bpy.types.Operator, UTIL_file_browser.ImportVirtool
         return (
             PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
             and bmap.is_bmap_available())
+
+    def invoke(self, context, event):
+        # preset virtools encoding if possible
+        self.preset_vt_encodings_if_possible(context)
+        # call parent invoke function (do no call self "execute", because we need show a modal window)
+        return super().invoke(context, event)
     
     def execute(self, context):
         # check whether encoding list is empty to avoid real stupid user.
@@ -26,8 +32,14 @@ class BBP_OT_import_virtools(bpy.types.Operator, UTIL_file_browser.ImportVirtool
             self.report({'ERROR'}, 'You must specify at least one encoding for file loading (e.g. cp1252, gbk)!')
             return {'CANCELLED'}
 
+        # check file name
+        filename = self.general_get_filename()
+        if not os.path.isfile(filename):
+            self.report({'ERROR'}, 'No file was selected!')
+            return {'CANCELLED'}
+
         _import_virtools(
-            self.general_get_filename(),
+            filename,
             encodings,
             self.general_get_conflict_resolver()
         )
@@ -40,7 +52,7 @@ class BBP_OT_import_virtools(bpy.types.Operator, UTIL_file_browser.ImportVirtool
         self.draw_virtools_params(context, layout, True)
         self.draw_ballance_params(layout, True)
 
-def _import_virtools(file_name_: str, encodings_: tuple[str], resolver: UTIL_ioport_shared.ConflictResolver) -> None:
+def _import_virtools(file_name_: str, encodings_: tuple[str, ...], resolver: UTIL_ioport_shared.ConflictResolver) -> None:
     # create temp folder
     with tempfile.TemporaryDirectory() as vt_temp_folder:
         tr_text: str = bpy.app.translations.pgettext_rpt(

bbp_ng/PROP_ptrprop_resolver.py

@@ -195,6 +195,16 @@ class PropsVisitor():
     def get_ioport_encodings(self) -> tuple[str, ...]:
         encodings = get_ioport_encodings(self.__mAssocScene)
         return tuple(i.encoding for i in encodings)
+    def preset_ioport_encodings(self) -> None:
+        """
+        Set IOPort used encodings list as preset encoding list.
+        Please note that all old values will be overwritten.
+        """
+        encodings = get_ioport_encodings(self.__mAssocScene)
+        encodings.clear()
+        for default_enc in UTIL_virtools_types.g_PyBMapDefaultEncodings:
+            item = encodings.add()
+            item.encoding = default_enc
     def draw_ioport_encodings(self, layout: bpy.types.UILayout) -> None:
         target = get_ptrprop_resolver(self.__mAssocScene)
         row = layout.row()
@@ -218,24 +228,11 @@ class PropsVisitor():
         col.separator()
         col.operator(BBP_OT_clear_ioport_encodings.bl_idname, icon='TRASH', text='')
 
-@bpy.app.handlers.persistent
-def _ioport_encodings_initializer(file_path: str):
-    # if we can fetch property, and it is empty after loading file
-    # we fill it with default value
-    encodings = get_ioport_encodings(bpy.context.scene)
-    if len(encodings) == 0:
-        for default_enc in UTIL_virtools_types.g_PyBMapDefaultEncodings:
-            item = encodings.add()
-            item.encoding = default_enc
-
 def register() -> None:
     bpy.utils.register_class(BBP_PG_bmap_encoding)
     bpy.utils.register_class(BBP_UL_bmap_encoding)
     bpy.utils.register_class(BBP_PG_ptrprop_resolver)
 
-    # register ioport encodings default value
-    bpy.app.handlers.load_post.append(_ioport_encodings_initializer)
-
     bpy.utils.register_class(BBP_OT_add_ioport_encodings)
     bpy.utils.register_class(BBP_OT_rm_ioport_encodings)
     bpy.utils.register_class(BBP_OT_up_ioport_encodings)
@@ -253,9 +250,6 @@ def unregister() -> None:
     bpy.utils.unregister_class(BBP_OT_rm_ioport_encodings)
     bpy.utils.unregister_class(BBP_OT_add_ioport_encodings)
 
-    # unregister ioport encodings default value
-    bpy.app.handlers.load_post.remove(_ioport_encodings_initializer)
-
     bpy.utils.unregister_class(BBP_PG_ptrprop_resolver)
     bpy.utils.unregister_class(BBP_UL_bmap_encoding)
     bpy.utils.unregister_class(BBP_PG_bmap_encoding)

bbp_ng/UTIL_bme.py

@@ -24,6 +24,7 @@ TOKEN_IDENTIFIER: str = 'identifier'
 
 TOKEN_SHOWCASE: str = 'showcase'
 TOKEN_SHOWCASE_TITLE: str = 'title'
+TOKEN_SHOWCASE_CATEGORY: str = 'category'
 TOKEN_SHOWCASE_ICON: str = 'icon'
 TOKEN_SHOWCASE_TYPE: str = 'type'
 TOKEN_SHOWCASE_CFGS: str = 'cfgs'
@@ -64,10 +65,10 @@ TOKEN_INSTANCES_TRANSFORM: str = 'transform'
 
 #region Prototype Loader
 
-## The list storing BME prototype.
 _g_BMEPrototypes: list[dict[str, typing.Any]] = []
-## The dict. Key is prototype identifier. value is the index of prototype in prototype list.
+"""The list storing BME prototype."""
 _g_BMEPrototypeIndexMap: dict[str, int] = {}
+"""The dict. Key is prototype identifier. Value is the index of prototype in prototype list."""
 
 # the core loader
 for walk_root, walk_dirs, walk_files in os.walk(os.path.join(os.path.dirname(__file__), 'jsons')):
@@ -99,7 +100,7 @@ def _env_fct_angle(x1: float, y1: float, x2: float, y2: float) -> float:
     # second, its direction (clockwise is positive) is opposite with blender rotation direction (counter-clockwise is positive).
     diff = mathutils.Vector((x2, y2)) - mathutils.Vector((x1, y1))
     bld_angle = math.degrees(mathutils.Vector((1,0)).angle_signed(diff, 0))
-
+    
     # flip it first
     bld_angle = -bld_angle
     # process positove number and negative number respectively
@@ -141,7 +142,7 @@ _g_ProgFieldGlobals: dict[str, typing.Any] = {
     'rot': lambda x, y, z: mathutils.Matrix.LocRotScale(None, mathutils.Euler((math.radians(x), math.radians(y), math.radians(z)), 'XYZ'), None),
     'scale': lambda x, y, z: mathutils.Matrix.LocRotScale(None, None, (x, y, z)),
     'ident': lambda: mathutils.Matrix.Identity(4),
-
+    
     # my misc custom functions
     'distance': _env_fct_distance,
     'angle': _env_fct_angle,
@@ -191,8 +192,32 @@ class EnumPropHelper(UTIL_functions.EnumPropHelper[str]):
     """
     The BME specialized Blender EnumProperty helper.
     """
+
+    showcase_identifiers: tuple[str, ...]
+    showcase_categories: dict[str, tuple[str, ...]]
     
     def __init__(self):
+        # build cache for showcase identifiers and categories
+        # prepare cache value
+        identifiers: list[str] = []
+        categories: dict[str, list[str]] = {}
+        # iterate showcase prototypes
+        for x in filter(lambda x: x[TOKEN_SHOWCASE] is not None, _g_BMEPrototypes):
+            # fetch identifier and category
+            identifier = typing.cast(str, x[TOKEN_IDENTIFIER])
+            category = typing.cast(str, x[TOKEN_SHOWCASE][TOKEN_SHOWCASE_CATEGORY])
+            # add into identifier list
+            identifiers.append(identifier)
+            # add into categories
+            categories_inner = categories.get(category, None)
+            if categories_inner is None:
+                categories_inner = []
+                categories[category] = categories_inner
+            categories_inner.append(identifier)
+        # tuple the result
+        self.showcase_identifiers = tuple(identifiers)
+        self.showcase_categories = {k: tuple(v) for k, v in categories.items()}
+
         # init parent class
         super().__init__(
             self.get_bme_identifiers(),
@@ -202,17 +227,20 @@ class EnumPropHelper(UTIL_functions.EnumPropHelper[str]):
             lambda _: '',
             lambda x: self.get_bme_showcase_icon(x)
         )
-    
+
     def get_bme_identifiers(self) -> tuple[str, ...]:
         """
         Get the identifier of prototype which need to be exposed to user.
-        Template prototype is not included.
+        In other words, template prototype is not included.
         """
-        return tuple(
+        return self.showcase_identifiers
-            x[TOKEN_IDENTIFIER] # get identifier
-            for x in filter(lambda x: x[TOKEN_SHOWCASE] is not None, _g_BMEPrototypes)  # filter() to filter no showcase template.
-        )
     
+    def get_bme_categories(self) -> dict[str, tuple[str, ...]]:
+        """
+        Get user-oriented identifier list grouped by category.
+        """
+        return self.showcase_categories
+
     def get_bme_showcase_title(self, ident: str) -> str:
         """
         Get BME display title by prototype identifier.
@@ -326,14 +354,14 @@ def create_bme_struct(
     # create mtl slot remap to help following mesh adding
     # because mesh writer do not accept string format mtl slot visiting,
     # it only accept int based mtl slot index.
-    # 
+    #
     # Also we build face used mtl slot index at the same time.
     # So we do not analyse texture field again when providing face data.
     # The result is in `prebuild_face_mtl_idx` and please note it will store all face's mtl index.
     # For example: if face 0 is skipped and face 1 is used, the first entry in `prebuild_face_mtl_idx`
     # will be the mtl slot index used by face 0, not 1. And its length is equal to the face count.
     # However, because face 0 is skipped, so the entry is not used and default set to 0.
-    # 
+    #
     # NOTE: since Python 3.6, the item of builtin dict is ordered by inserting order.
     # we rely on this to implement following features.
     mtl_remap: dict[str, int] = {}
@@ -351,7 +379,7 @@ def create_bme_struct(
             # if existing, no need to add into remap
             # but we need get its index from remap
             prebuild_face_mtl_idx[face_idx] = mtl_remap.get(mtl_name, 0)
-
+    
     # pre-compute vertices data because we may need used later.
     # Because if face normal data is null, it mean that we need to compute it
     # by given vertices.
@@ -366,7 +394,7 @@ def create_bme_struct(
         cache_bv = typing.cast(mathutils.Vector, transform @ cache_bv)
         # get result
         prebuild_vec_data.append((cache_bv.x, cache_bv.y, cache_bv.z))
-
+    
     # Check whether given transform is mirror matrix
     # because mirror matrix will reverse triangle indice order.
     # If matrix is mirror matrix, we need reverse it again in following procession,

bbp_ng/UTIL_ioport_shared.py

@@ -340,6 +340,14 @@ class VirtoolsParams():
         translation_context = 'BBP/UTIL_ioport_shared.VirtoolsParams/property'
     ) # type: ignore
 
+    def preset_vt_encodings_if_possible(self, context: bpy.types.Context):
+        """
+        Set preset value for Virtools Encoding list if there is no value inside it.
+        """
+        ptrprops = PROP_ptrprop_resolver.PropsVisitor(context.scene)
+        if len(ptrprops.get_ioport_encodings()) == 0:
+            ptrprops.preset_ioport_encodings()
+
     def draw_virtools_params(self, context: bpy.types.Context, layout: bpy.types.UILayout, is_importer: bool) -> None:
         header: bpy.types.UILayout
         body: bpy.types.UILayout
@@ -364,7 +372,6 @@ class VirtoolsParams():
             if self.use_compress:
                 body.prop(self, 'compress_level')
 
-
     def general_get_vt_encodings(self, context: bpy.types.Context) -> tuple[str, ...]:
         # get from ptrprop resolver then filter empty item
         ptrprops = PROP_ptrprop_resolver.PropsVisitor(context.scene)

bbp_ng/UTIL_translation.py

@@ -55,14 +55,22 @@ import bpy
 CTX_BBP: str = 'BBP'
 
 # The universal translation context prefix for BME module in BBP_NG plugin.
-CTX_BBP_BME: str = CTX_BBP + '/BME'
+CTX_BBP_BME: str = f'{CTX_BBP}/BME'
-def build_prototype_showcase_context(identifier: str) -> str:
+CTX_BBP_BME_CATEGORY: str = f'{CTX_BBP_BME}/Category'
+CTX_BBP_BME_PROTOTYPE: str = f'{CTX_BBP_BME}/Proto'
+def build_prototype_showcase_category_context() -> str:
+    """
+    Build the context for getting the translation for BME prototype showcase category.
+    @return The context for getting translation.
+    """
+    return CTX_BBP_BME_CATEGORY
+def build_prototype_showcase_title_context(identifier: str) -> str:
     """
     Build the context for getting the translation for BME prototype showcase title.
     @param[in] identifier The identifier of this prototype.
     @return The context for getting translation.
     """
-    return CTX_BBP_BME + '/' + identifier
+    return f'{CTX_BBP_BME_PROTOTYPE}/{identifier}'
 def build_prototype_showcase_cfg_context(identifier: str, cfg_index: int) -> str:
     """
     Build the context for getting the translation for BME prototype showcase configuration title or description.
@@ -70,7 +78,7 @@ def build_prototype_showcase_cfg_context(identifier: str, cfg_index: int) -> str
     @param[in] cfg_index The index of this configuration in this prototype showcase.
     @return The context for getting translation.
     """
-    return CTX_BBP_BME + f'/{identifier}/[{cfg_index}]'
+    return f'{CTX_BBP_BME_PROTOTYPE}/{identifier}/[{cfg_index}]'
 
 #endregion
 

scripts/bme.py

@@ -27,6 +27,7 @@ class ShowcaseCfg(BaseModel):
 
 class Showcase(BaseModel):
     title: str = Field(frozen=True, strict=True)
+    category: str = Field(frozen=True, strict=True)
     icon: str = Field(frozen=True, strict=True)
     type: ShowcaseType = Field(frozen=True)
     cfgs: list[ShowcaseCfg] = Field(frozen=True, strict=True)

scripts/extract_jsons.py

@@ -9,80 +9,96 @@ import pydantic, polib, json5
 #  If the context string of translation changed, please synchronize it.
 
 CTX_TRANSLATION: str = 'BBP/BME'
+CTX_PROTOTYPE: str = f'{CTX_TRANSLATION}/Proto'
+CTX_CATEGORY: str = f'{CTX_TRANSLATION}/Category'
 
 
-def _extract_prototype(prototype: bme.Prototype) -> typing.Iterator[polib.POEntry]:
+class JsonsExtractor:
-    identifier = prototype.identifier
-    showcase = prototype.showcase
 
-    # Show message
+    po: polib.POFile
-    logging.info(f'Extracting prototype {identifier}')
+    """Extracted PO file"""
+    categories: set[str]
+    """Set for removing duplicated category names"""
 
-    # Extract showcase
+    def __init__(self) -> None:
-    if showcase is None:
+        # create po file
-        return
+        self.po = polib.POFile()
+        self.po.metadata = {
+            'Project-Id-Version': '1.0',
+            'Report-Msgid-Bugs-To': 'you@example.com',
+            'POT-Creation-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            'PO-Revision-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            'Last-Translator': 'FULL NAME <EMAIL@ADDRESS>',
+            'Language-Team': 'LANGUAGE <LL@li.org>',
+            'MIME-Version': '1.0',
+            'Content-Type': 'text/plain; charset=utf-8',
+            'Content-Transfer-Encoding': '8bit',
+            'X-Generator': 'polib',
+        }
+        # create category set
+        self.categories = set()
 
-    # Extract showcase title
+    def __extract_prototype(self, prototype: bme.Prototype) -> None:
-    yield polib.POEntry(msgid=showcase.title, msgstr='', msgctxt=f'{CTX_TRANSLATION}/{identifier}')
+        identifier = prototype.identifier
-    # Extract showcase entries
+        showcase = prototype.showcase
-    for i, cfg in enumerate(showcase.cfgs):
-        # extract title and description
-        yield polib.POEntry(msgid=cfg.title, msgstr='', msgctxt=f'{CTX_TRANSLATION}/{identifier}/[{i}]')
-        yield polib.POEntry(msgid=cfg.desc, msgstr='', msgctxt=f'{CTX_TRANSLATION}/{identifier}/[{i}]')
 
+        # Show message
+        logging.info(f'Extracting prototype {identifier}')
 
-def _extract_json(json_file: Path) -> typing.Iterator[polib.POEntry]:
+        # Extract showcase
-    # Show message
+        if showcase is None:
-    logging.info(f'Extracting file {json_file}')
+            return
 
-    try:
+        # Extract showcase title
-        # Read file and convert it into BME struct.
+        self.po.append(polib.POEntry(msgid=showcase.title, msgstr='', msgctxt=f'{CTX_PROTOTYPE}/{identifier}'))
-        with open(json_file, 'r', encoding='utf-8') as f:
+        # extract showcase category
-            document = json5.load(f)
+        if showcase.category not in self.categories:
-        prototypes = bme.Prototypes.model_validate(document)
+            self.po.append(polib.POEntry(msgid=showcase.category, msgstr='', msgctxt=CTX_CATEGORY))
-        # Extract translation
+            self.categories.add(showcase.category)
-        return itertools.chain.from_iterable(_extract_prototype(prototype) for prototype in prototypes.root)
+        # Extract showcase entries
-    except pydantic.ValidationError:
+        for i, cfg in enumerate(showcase.cfgs):
-        logging.error(f'Can not extract translation from {json_file} due to struct error. Please validate it first.')
+            # extract title and description
-    except (ValueError, UnicodeDecodeError):
+            self.po.append(polib.POEntry(msgid=cfg.title, msgstr='', msgctxt=f'{CTX_PROTOTYPE}/{identifier}/[{i}]'))
-        logging.error(f'Can not extract translation from {json_file} due to JSON5 error. Please validate it first.')
+            self.po.append(polib.POEntry(msgid=cfg.desc, msgstr='', msgctxt=f'{CTX_PROTOTYPE}/{identifier}/[{i}]'))
 
-    # Output nothing
+    def __extract_json(self, json_file: Path) -> None:
-    return itertools.chain.from_iterable(())
+        # Show message
+        logging.info(f'Extracting file {json_file}')
 
+        try:
+            # Read file and convert it into BME struct.
+            with open(json_file, 'r', encoding='utf-8') as f:
+                document = json5.load(f)
+            prototypes = bme.Prototypes.model_validate(document)
+            # Extract translation
+            for prototype in prototypes.root:
+                self.__extract_prototype(prototype)
+        except pydantic.ValidationError:
+            logging.error(
+                f'Can not extract translation from {json_file} due to struct error. Please validate it first.')
+        except (ValueError, UnicodeDecodeError):
+            logging.error(f'Can not extract translation from {json_file} due to JSON5 error. Please validate it first.')
 
-def extract_jsons() -> None:
+    def extract_jsons(self) -> None:
-    raw_jsons_dir = common.get_raw_assets_folder(AssetKind.Jsons)
+        raw_jsons_dir = common.get_raw_assets_folder(AssetKind.Jsons)
 
-    # Create POT content
+        # Iterate all prototypes and add into POT
-    po = polib.POFile()
+        for raw_json_file in raw_jsons_dir.glob('*.json5'):
-    po.metadata = {
+            # Skip non-file.
-        'Project-Id-Version': '1.0',
+            if not raw_json_file.is_file():
-        'Report-Msgid-Bugs-To': 'you@example.com',
+                continue
-        'POT-Creation-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            # Extract json
-        'PO-Revision-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            self.__extract_json(raw_json_file)
-        'Last-Translator': 'FULL NAME <EMAIL@ADDRESS>',
-        'Language-Team': 'LANGUAGE <LL@li.org>',
-        'MIME-Version': '1.0',
-        'Content-Type': 'text/plain; charset=utf-8',
-        'Content-Transfer-Encoding': '8bit',
-        'X-Generator': 'polib',
-    }
 
-    # Iterate all prototypes and add into POT
+    def save(self) -> None:
-    for raw_json_file in raw_jsons_dir.glob('*.json5'):
+        """Save extracted POT file into correct path"""
-        # Skip non-file.
+        pot_file = common.get_root_folder() / 'i18n' / 'bme.pot'
-        if not raw_json_file.is_file():
+        logging.info(f'Saving POT into {pot_file}')
-            continue
+        self.po.save(str(pot_file))
-        # Extract json and append it.
-        po.extend(_extract_json(raw_json_file))
-
-    # Write into POT file
-    pot_file = common.get_root_folder() / 'i18n' / 'bme.pot'
-    logging.info(f'Saving POT into {pot_file}')
-    po.save(str(pot_file))
 
 
 if __name__ == '__main__':
     common.setup_logging()
-    extract_jsons()
+    extractor = JsonsExtractor()
+    extractor.extract_jsons()
+    extractor.save()

scripts/validate_jsons.py

@@ -48,6 +48,9 @@ def _validate_showcase(showcase: bme.Showcase, variables: set[str]) -> None:
     # The title of showcase should not be empty
     if len(showcase.title) == 0:
         logging.error('The title of showcase should not be empty.')
+    # Category words should not be empty.
+    if len(showcase.category) == 0:
+        logging.error('The category of showcase should not be empty.')
 
     # Check icon name
     _check_showcase_icon(showcase.icon)