stabilizing, user experience

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

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):