add-designer: validate name

bin/gftools-add-designer.py

@@ -90,6 +90,19 @@ def gen_hrefs(urls):
     return " | ".join(f"<a href={k}>{v}</a>" for k,v in res.items())
 
 
+def designer_name(name):
+    """Google Fonts only accepts designer names which use the Latin script"""
+    # Check all characters are within range U+0000 - U+024F (Basic Latin - Latin Ex-B)
+    # https://www.compart.com/en/unicode/plane/U+0000
+    invalid_chars = [c for c in name if ord(c) > 0x024F]
+    if invalid_chars:
+        raise argparse.ArgumentTypeError(
+            f"'{name}' has the following illegal characters {invalid_chars}. "
+            "Please Latinize names."
+        )
+    return name
+
+
 def make_designer(
     designer_directory,
     name,
@@ -149,7 +162,7 @@ def make_designer(
 def main():
     parser = argparse.ArgumentParser(usage=__doc__)
     parser.add_argument("designers_directory", help="path to google/fonts designer dir")
-    parser.add_argument("name", help="Designer name e.g 'Steve Matteson'")
+    parser.add_argument("name", help="Designer name e.g 'Steve Matteson'", type=designer_name)
     parser.add_argument("--img_path", help="Optional path to profile image", default=None)
     parser.add_argument(
         "--spreadsheet", help="Optional path to the Google Drive spreadsheet"