stabilizing, user experience

use class for glyph availability
use isinstance instead of type
better user experience when export directory does not exist

__init__.py

@@ -35,7 +35,6 @@ if "Font" in locals():
     importlib.reload(bimport)
     importlib.reload(addon_updater_ops)
 
-
 def getPreferences(context):
     preferences = context.preferences
     return preferences.addons[__name__].preferences
@@ -398,51 +397,51 @@ class ABC3D_PT_FontList(bpy.types.Panel):
             available_font = abc3d_data.available_fonts[abc3d_data.active_font_index]
             font_name = available_font.font_name
             face_name = available_font.face_name
-            available_glyphs = sorted(
+            face : Font.FontFace = Font.get_font_face(font_name, face_name)
-                Font.fonts[font_name].faces[face_name].glyphs_in_fontfile
+            if face is not None:
-            )
+                available_glyphs = face.glyphs_in_fontfile
-            loaded_glyphs = sorted(Font.fonts[font_name].faces[face_name].loaded_glyphs)
+                loaded_glyphs = sorted(face.loaded_glyphs)
-            box = layout.box()
+                box = layout.box()
-            box.row().label(text=f"Font Name: {font_name}")
+                box.row().label(text=f"Font Name: {font_name}")
-            box.row().label(text=f"Face Name: {face_name}")
+                box.row().label(text=f"Face Name: {face_name}")
-            n = 16
+                n = 16
-            n_rows = int(len(available_glyphs) / n)
+                n_rows = int(len(available_glyphs) / n)
-            box.row().label(text="Glyphs:")
+                box.row().label(text="Glyphs:")
-            subbox = box.box()
+                subbox = box.box()
-            for i in range(0, n_rows + 1):
+                for i in range(0, n_rows + 1):
-                text = "".join(
+                    text = "".join(
-                    [
+                        [
-                        f"{u}"
+                            f"{u}"
-                        for ui, u in enumerate(available_glyphs)
+                            for ui, u in enumerate(available_glyphs)
-                        if ui < (i + 1) * n and ui >= i * n
+                            if ui < (i + 1) * n and ui >= i * n
-                    ]
+                        ]
+                    )
+                    scale_y = 0.5
+                    row = subbox.row()
+                    row.scale_y = scale_y
+                    row.alignment = "CENTER"
+                    row.label(text=text)
+                n_rows = int(len(loaded_glyphs) / n)
+                box.row().label(text="Loaded/Used Glyphs:")
+                subbox = box.box()
+                for i in range(0, n_rows + 1):
+                    text = "".join(
+                        [
+                            f"{u}"
+                            for ui, u in enumerate(loaded_glyphs)
+                            if ui < (i + 1) * n and ui >= i * n
+                        ]
+                    )
+                    scale_y = 0.5
+                    row = subbox.row()
+                    row.scale_y = scale_y
+                    row.label(text=text)
+                row = layout.row()
+                oper_lf = row.operator(
+                    f"{__name__}.load_font", text="Load all glyphs in memory"
                 )
-                scale_y = 0.5
+                oper_lf.font_name = font_name
-                row = subbox.row()
+                oper_lf.face_name = face_name
-                row.scale_y = scale_y
-                row.alignment = "CENTER"
-                row.label(text=text)
-            n_rows = int(len(loaded_glyphs) / n)
-            box.row().label(text="Loaded/Used Glyphs:")
-            subbox = box.box()
-            for i in range(0, n_rows + 1):
-                text = "".join(
-                    [
-                        f"{u}"
-                        for ui, u in enumerate(loaded_glyphs)
-                        if ui < (i + 1) * n and ui >= i * n
-                    ]
-                )
-                scale_y = 0.5
-                row = subbox.row()
-                row.scale_y = scale_y
-                row.label(text=text)
-            row = layout.row()
-            oper_lf = row.operator(
-                f"{__name__}.load_font", text="Load all glyphs in memory"
-            )
-            oper_lf.font_name = font_name
-            oper_lf.face_name = face_name
 
 
 class ABC3D_PT_TextPlacement(bpy.types.Panel):
@@ -754,7 +753,6 @@ class ABC3D_PT_TextPropertiesPanel(bpy.types.Panel):
                         return t
         return None
 
-    # NOTE: HERE
     def get_active_glyph_properties(self):
         a_o = bpy.context.active_object
         if a_o is not None:
@@ -1026,7 +1024,11 @@ class ABC3D_OT_LoadFont(bpy.types.Operator):
     face_name: bpy.props.StringProperty()
 
     def execute(self, context):
-        filepaths = Font.fonts[self.font_name].faces[self.face_name].filepaths
+        face : Font.FontFace = Font.get_font_face(self.font_name, self.face_name)
+        if face is None:
+            butils.ShowMessageBox(f"{utils.prefix()} Load Font", icon="ERROR", message=["Could not load font, sorry!", f"{self.font_name=} {self.face_name=}"])
+            return {"CANCELLED"}
+        filepaths = face.filepaths
         for f in filepaths:
             butils.load_font_from_filepath(f)
         return {"FINISHED"}
@@ -1402,6 +1404,9 @@ class ABC3D_OT_SaveFontToFile(bpy.types.Operator):
     bl_label = "Save Font"
     bl_options = {"REGISTER", "UNDO"}
 
+    can_execute : bpy.props.BoolProperty(default=True)
+    create_output_directory : bpy.props.BoolProperty(default=False)
+
     def invoke(self, context, event):
         wm = context.window_manager
         preferences = getPreferences(context)
@@ -1425,30 +1430,95 @@ class ABC3D_OT_SaveFontToFile(bpy.types.Operator):
         available_font = abc3d_data.available_fonts[abc3d_data.active_font_index]
         font_name = available_font.font_name
         face_name = available_font.face_name
-        loaded_glyphs = sorted(Font.fonts[font_name].faces[face_name].loaded_glyphs)
+        face : Font.FontFace = Font.get_font_face(font_name, face_name)
-        n = 16
+        if face is not None:
-        n_rows = int(len(loaded_glyphs) / n)
+            loaded_glyphs = sorted(face.loaded_glyphs)
-        box = layout.box()
+            n = 16
-        box.row().label(text="Glyphs to be exported:")
+            n_rows = int(len(loaded_glyphs) / n)
-        subbox = box.box()
+            box = layout.box()
-        for i in range(0, n_rows + 1):
+            box.row().label(text="Glyphs to be exported:")
-            text = "".join(
+            subbox = box.box()
-                [
+            for i in range(0, n_rows + 1):
-                    f"{u}"
+                text = "".join(
-                    for ui, u in enumerate(loaded_glyphs)
+                    [
-                    if ui < (i + 1) * n and ui >= i * n
+                        f"{u}"
-                ]
+                        for ui, u in enumerate(loaded_glyphs)
-            )
+                        if ui < (i + 1) * n and ui >= i * n
-            scale_y = 0.5
+                    ]
-            row = subbox.row()
+                )
-            row.scale_y = scale_y
+                scale_y = 0.5
-            row.label(text=text)
+                row = subbox.row()
-        layout.prop(abc3d_data, "export_dir")
+                row.scale_y = scale_y
+                row.label(text=text)
+            row = layout.row()
+            export_dir = butils.bpy_to_abspath(abc3d_data.export_dir) 
+            if os.access(export_dir, os.W_OK):
+                self.can_execute = True
+            elif os.path.exists(export_dir):
+                self.can_execute = False
+                row.alert = True
+                row.label(text="Export directory exists but is not writable")
+                row = layout.row()
+                row.alert = True
+                row.label(text="Please select another directory")
+                row = layout.row()
+                row.alert = True
+            elif not utils.can_create_path(export_dir): # does not exist and cannot be created
+                self.can_execute = False
+                row.alert = True
+                row.label(text="Directory does not exist and cannot be created")
+                row = layout.row()
+                row.alert = True
+                row.label(text="Please select another directory")
+                row = layout.row()
+                row.alert = True
+            elif utils.can_create_path(export_dir): # does not exist and can be created
+                self.can_execute = True
+                row.label(text="Directory does not exist")
+                row = layout.row()
+                row.label(text="But can and will be created on export")
+                row = layout.row()
+            else:
+                self.can_execute = False
+                row.alert = True
+                row.label(text="Please select another directory")
+                row = layout.row()
+                row.alert = True
+
+            row.prop(abc3d_data, "export_dir")
+        else:
+            print(f"{utils.prefix()}::save_font_to_file ERROR {face=} {font_name=} {face_name=}")
+            print(f"{utils.prefix()}                          {Font.fonts=}")
 
     def execute(self, context):
         global shared
         scene = bpy.context.scene
         abc3d_data = scene.abc3d_data
+        if not self.can_execute:
+            butils.ShowMessageBox(
+                "Cannot export font",
+                "ERROR",
+                [
+                    f"export directory '{abc3d_data.export_dir}' does not exist or is not writable",
+                    "try setting another path"
+                ]
+            )
+            return {'CANCELLED'}
+
+        if not os.path.exists(butils.bpy_to_abspath(abc3d_data.export_dir)):
+            path = butils.bpy_to_abspath(abc3d_data.export_dir)
+            if utils.can_create_path(path):
+                os.makedirs(path, exist_ok=True)
+            else:
+                butils.ShowMessageBox(
+                    "Cannot export font",
+                    "ERROR",
+                    [
+                        f"export directory '{abc3d_data.export_dir}' does not exist and cannot be created",
+                        "try setting another path"
+                    ]
+                )
+                return {'CANCELLED'}
 
         fontcollection = bpy.data.collections.get("ABC3D")
 
@@ -1528,7 +1598,10 @@ class ABC3D_OT_SaveFontToFile(bpy.types.Operator):
                 use_selection=True,
                 use_active_scene=True,
             )
-            bpy.app.timers.register(lambda: bpy.ops.scene.delete(), first_interval=1)
+            def delete_scene():
+                bpy.ops.scene.delete()
+                return None
+            bpy.app.timers.register(lambda: delete_scene(), first_interval=1)
 
             # bpy.ops.scene.delete()
         # restore()
@@ -1669,9 +1742,6 @@ class ABC3D_OT_CreateFontFromObjects(bpy.types.Operator):
         font_name = self.font_name
         face_name = self.face_name
 
-        # TODO: do not clear
-        # abc3d_data.available_fonts.clear()
-        # Font.fonts = {}
         currentObjects = []
         for o in context.selected_objects:
             if o.name not in currentObjects:
@@ -1842,7 +1912,7 @@ def load_used_glyphs():
     abc3d_data = scene.abc3d_data
     for t in abc3d_data.available_texts:
         a = Font.test_availability(t.font_name, t.face_name, t.text)
-        if type(a) == type(int()):
+        if isinstance(a, int):
             if a == Font.MISSING_FONT:
                 butils.ShowMessageBox(
                     "Missing Font",
@@ -1859,9 +1929,9 @@ def load_used_glyphs():
                         "Do you have it installed?",
                     ],
                 )
-        elif len(a["maybe"]) > 0:
+        elif len(a.unloaded) > 0:
-            for fp in a["filepaths"]:
+            for fp in a.filepaths:
-                butils.load_font_from_filepath(fp, a["maybe"])
+                butils.load_font_from_filepath(fp, a.unloaded)
 
 
 @persistent

butils.py

@@ -515,7 +515,11 @@ def load_font_from_filepath(filepath, glyphs="", font_name="", face_name=""):
 
     for mff in modified_font_faces:
         mff_glyphs = []
-        face = Font.fonts[mff["font_name"]].faces[mff["face_name"]]
+        face : Font.FontFace = Font.get_font_face(mff["font_name"], mff["face_name"])
+        if face is None:
+            print(f"{utils.prefix()}::load_font_from_path({filepath=}, {glyphs=}, {font_name=}, {face_name=}) failed")
+            print(f"modified font face {mff=} could not be accessed.")
+            continue
         # iterate glyphs
         for g in face.glyphs:
             # iterate alternates
@@ -543,17 +547,18 @@ def load_font_from_filepath(filepath, glyphs="", font_name="", face_name=""):
 def update_available_fonts():
     abc3d_data = bpy.context.scene.abc3d_data
 
-    for font_name in Font.fonts.keys():
+    for font_and_face in Font.get_loaded_fonts_and_faces():
-        for face_name in Font.fonts[font_name].faces.keys():
+        found = False
-            found = False
+        font_name = font_and_face[0]
-            for f in abc3d_data.available_fonts.values():
+        face_name = font_and_face[1]
-                if font_name == f.font_name and face_name == f.face_name:
+        for f in abc3d_data.available_fonts.values():
-                    found = True
+            if font_name == f.font_name and face_name == f.face_name:
-            if not found:
+                found = True
-                f = abc3d_data.available_fonts.add()
+        if not found:
-                f.font_name = font_name
+            f = abc3d_data.available_fonts.add()
-                f.face_name = face_name
+            f.font_name = font_name
-                print(f"{__name__} added {font_name} {face_name}")
+            f.face_name = face_name
+            print(f"{__name__} added {font_name} {face_name}")
 
 
 # def update_available_texts():
@@ -754,21 +759,28 @@ def get_glyph_height(glyph_obj):
 
 
 def prepare_text(font_name, face_name, text, allow_replacement=True):
-    loaded, missing, loadable, files = Font.test_glyphs_availability(
+    availability = Font.test_glyphs_availability(
         font_name, face_name, text
     )
+    if isinstance(availability, int):
+        if availability == Font.MISSING_FONT:
+            print(f"{utils.prefix()}::prepare_text({font_name=}, {face_name=}, {text=}) failed with MISSING_FONT")
+        if availability is Font.MISSING_FACE:
+            print(f"{utils.prefix()}::prepare_text({font_name=}, {face_name=}, {text=}) failed with MISSING_FACE")
+        return False
+    loadable = availability.unloaded
     # possibly replace upper and lower case letters with each other
-    if len(missing) > 0 and allow_replacement:
+    if len(availability.missing) > 0 and allow_replacement:
         replacement_search = ""
-        for m in missing:
+        for m in availability.missing:
             if m.isalpha():
                 replacement_search += m.swapcase()
         r = Font.test_availability(font_name, face_name, replacement_search)
-        loadable += r["maybe"]
+        loadable += r.unloaded
         # not update (loaded, missing, files), we only use loadable/maybe later
 
     if len(loadable) > 0:
-        for filepath in files:
+        for filepath in availability.filepaths:
             load_font_from_filepath(filepath, loadable, font_name, face_name)
     return True
 
@@ -776,9 +788,9 @@ def predict_actual_text(text_properties):
     availability = Font.test_availability(text_properties.font_name, text_properties.face_name, text_properties.text)
     AVAILABILITY = Font.test_availability(text_properties.font_name, text_properties.face_name, text_properties.text.swapcase())
     t_text = text_properties.text
-    for c in availability["missing"]:
+    for c in availability.missing:
         t_text = t_text.replace(c, "")
-    for c in AVAILABILITY["missing"]:
+    for c in AVAILABILITY.missing:
         t_text = t_text.replace(c, "")
     return t_text
 
@@ -1016,14 +1028,8 @@ def transfer_text_object_to_text_properties(text_object, text_properties, id_fro
         if text == text_properties.text:
             is_good_text = True
         else:
-            availability = Font.test_availability(text_properties.font_name, text_properties.face_name, text_properties.text)
+            t_text = predict_actual_text(text_properties)
-            AVAILABILITY = Font.test_availability(text_properties.font_name, text_properties.face_name, text_properties.text.swapcase())
+            if t_text == text:
-            t_text = text_properties.text
-            for c in availability["missing"]:
-                t_text = t_text.replace(c, "")
-            for c in AVAILABILITY["missing"]:
-                t_text = t_text.replace(c, "")
-            if len(t_text) == len(text):
                 is_good_text = True
     if is_good_text:
         text_properties.actual_text = text
@@ -1252,7 +1258,7 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4,
 
     actual_text = ""
     for i, c in enumerate(text_properties.text):
-        face = Font.fonts[text_properties.font_name].faces[text_properties.face_name]
+        face = Font.get_font_face(text_properties.font_name, text_properties.face_name)
         scalor = face.unit_factor * text_properties.font_size
         if c == "\\":
             is_command = True

common/Font.py

@@ -1,5 +1,6 @@
 from typing import Dict
 from pathlib import Path
+from typing import NamedTuple
 
 # convenience dictionary for translating names to glyph ids
 # note: overwritten/extended by the content of "glypNamesToUnicode.txt"
@@ -160,6 +161,7 @@ class Font:
         self.faces = faces
 
 
+
 def register_font(font_name, face_name, glyphs_in_fontfile, filepath):
     if not fonts.keys().__contains__(font_name):
         fonts[font_name] = Font({})
@@ -177,6 +179,34 @@ def register_font(font_name, face_name, glyphs_in_fontfile, filepath):
         fonts[font_name].faces[face_name].filepaths.append(filepath)
 
 
+def get_font(font_name):
+    if not fonts.keys().__contains__(font_name):
+        print(f"ABC3D::get_font: font name({font_name}) not found")
+        print(fonts.keys())
+        return None
+    return fonts[font_name]
+
+
+def get_font_face(font_name, face_name):
+    font = get_font(font_name)
+    if font is None:
+        return None
+    if not font.faces.keys().__contains__(face_name):
+        print(
+            f"ABC3D::get_font_face (font: {font_name}): face name({face_name}) not found"
+        )
+        print(font.faces.keys())
+        return None
+    return font.faces[face_name]
+
+
+def get_font_face_filepaths(font_name, face_name):
+    face = get_font_face(font_name, face_name)
+    if not face:
+        return None
+    return face.filepaths
+
+
 def add_glyph(font_name, face_name, glyph_id, glyph_object):
     """add_glyph adds a glyph to a FontFace
     it creates the :class:`Font` and :class:`FontFace` if it does not exist yet
@@ -203,6 +233,38 @@ def add_glyph(font_name, face_name, glyph_id, glyph_object):
         fonts[font_name].faces[face_name].loaded_glyphs.append(glyph_id)
 
 
+def get_glyphs(font_name, face_name, glyph_id):
+    """get_glyphs returns an array of glyphs of a FontFace
+
+    :param font_name: The :class:`Font` you want to get the glyph from
+    :type font_name: str
+    :param face_name: The :class:`FontFace` you want to get the glyph from
+    :type face_name: str
+    :param glyph_id: The ``glyph_id`` from the glyph you want
+    :type glyph_id: str
+    ...
+    :return: returns a list of the glyph objects, or an empty list if none exists
+    :rtype: `List`
+    """
+
+    face = get_font_face(font_name, face_name)
+    if face is None:
+        print(f"ABC3D::get_glyph: font({font_name}) face({face_name}) not found")
+        print(fonts[font_name].faces.keys())
+        return []
+
+    glyphs_for_id = face.glyphs.get(glyph_id)
+    if glyphs_for_id is None:
+        print(
+            f"ABC3D::get_glyph: font({font_name}) face({face_name}) glyph({glyph_id}) not found"
+        )
+        if glyph_id not in fonts[font_name].faces[face_name].missing_glyphs:
+            fonts[font_name].faces[face_name].missing_glyphs.append(glyph_id)
+        return []
+
+    return glyphs_for_id
+
+
 def get_glyph(font_name, face_name, glyph_id, alternate=0):
     """add_glyph adds a glyph to a FontFace
     it creates the :class:`Font` and :class:`FontFace` if it does not exist yet
@@ -218,25 +280,22 @@ def get_glyph(font_name, face_name, glyph_id, alternate=0):
     :rtype: `Object`
     """
 
-    if not fonts.keys().__contains__(font_name):
+    glyphs = get_glyphs(font_name, face_name, glyph_id)
-        # print(f"ABC3D::get_glyph: font name({font_name}) not found")
+
-        # print(fonts.keys())
+    if len(glyphs) <= alternate or len(glyphs) == 0:
+        print(
+            f"ABC3D::get_glyph: font({font_name}) face({face_name}) glyph({glyph_id})[{alternate}] not found"
+        )
         return None
 
-    face = fonts[font_name].faces.get(face_name)
+    return glyphs[alternate]
-    if face is None:
-        # print(f"ABC3D::get_glyph: font({font_name}) face({face_name}) not found")
-        # print(fonts[font_name].faces.keys())
-        return None
 
-    glyphs_for_id = face.glyphs.get(glyph_id)
-    if glyphs_for_id is None or len(glyphs_for_id) <= alternate:
-        # print(f"ABC3D::get_glyph: font({font_name}) face({face_name}) glyph({glyph_id})[{alternate}] not found")
-        if glyph_id not in fonts[font_name].faces[face_name].missing_glyphs:
-            fonts[font_name].faces[face_name].missing_glyphs.append(glyph_id)
-        return None
 
-    return fonts[font_name].faces[face_name].glyphs.get(glyph_id)[alternate]
+class GlyphsAvailability(NamedTuple):
+    loaded: str
+    missing: str
+    unloaded: str
+    filepaths: list[str]
 
 
 def test_glyphs_availability(font_name, face_name, text):
@@ -245,24 +304,24 @@ def test_glyphs_availability(font_name, face_name, text):
         not fonts.keys().__contains__(font_name)
         or fonts[font_name].faces.get(face_name) is None
     ):
-        return "", "", text  # <loaded>, <missing>, <maybe>
+        return GlyphsAvailability("", "", "", [])
 
     loaded = []
     missing = []
-    maybe = []
+    unloaded = []
     for c in text:
         if c in fonts[font_name].faces[face_name].loaded_glyphs:
             loaded.append(c)
         elif c in fonts[font_name].faces[face_name].glyphs_in_fontfile:
-            maybe.append(c)
+            unloaded.append(c)
         else:
             if c not in fonts[font_name].faces[face_name].missing_glyphs:
                 fonts[font_name].faces[face_name].missing_glyphs.append(c)
             missing.append(c)
-    return (
+    return GlyphsAvailability(
         "".join(loaded),
         "".join(missing),
-        "".join(maybe),
+        "".join(unloaded),
         fonts[font_name].faces[face_name].filepaths,
     )
 
@@ -288,15 +347,10 @@ def test_availability(font_name, face_name, text):
         return MISSING_FONT
     if fonts[font_name].faces.get(face_name) is None:
         return MISSING_FACE
-    loaded, missing, maybe, filepaths = test_glyphs_availability(
+    availability: GlyphsAvailability = test_glyphs_availability(
         font_name, face_name, text
     )
-    return {
+    return availability
-        "loaded": loaded,
-        "missing": missing,
-        "maybe": maybe,
-        "filepaths": filepaths,
-    }
 
 
 # holds all fonts

common/utils.py

@@ -89,6 +89,26 @@ def printerr(*args, **kwargs):
 def removeNonAlphabetic(s):
     return "".join([i for i in s if i.isalpha()])
 
+import pathlib
+import os
+
+def can_create_path(path_str : str):
+    path = pathlib.Path(path_str).absolute().resolve()
+
+    while True: # this looks dangerours, but it actually is not
+        if path.exists():
+            if os.access(path, os.W_OK):
+                return True
+            else:
+                return False
+        elif path == path.parent:
+            # should never be reached, because root exists
+            # but if it doesn't.. well then we can't
+            return False
+
+        path = path.parent
+
+
 
 # # Evaluate a bezier curve for the parameter 0<=t<=1 along its length
 # def evaluateBezierPoint(p1, h1, h2, p2, t):