[cantarell-fonts] Add normalization script

[Nikolaus Waxweiler <nwaxweiler src gnome org>]

commit a725d7263691ca66c0e65f4ddc6b8df1ae436b72
Author: Nikolaus Waxweiler <madigens gmail com>
Date:   Tue Dec 22 21:40:39 2020 +0000

    Add normalization script

 scripts/normalize.py | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
---
diff --git a/scripts/normalize.py b/scripts/normalize.py
new file mode 100644
index 00000000..85b96b43
--- /dev/null
+++ b/scripts/normalize.py
@@ -0,0 +1,48 @@
+from pathlib import Path
+
+import ufoLib2
+
+
+source_directory = Path(__file__).parent.parent / "src"
+for ufo_path in source_directory.glob("*.ufo"):
+    ufo = ufoLib2.Font.open(ufo_path)
+
+    layer_names = [l.name for l in ufo.layers]
+    for name in layer_names:
+        if name != "public.default":
+            del ufo.layers[name]
+
+    ufo.layers.defaultLayer.lib = {
+        k: v for k, v in ufo.layers.defaultLayer.lib.items() if k.startswith("public.")
+    }
+
+    for glyph in ufo:
+        glyph.lib = {
+            k: v
+            for k, v in glyph.lib.items()
+            if (
+                k.startswith("public.")
+                or k.startswith("com.schriftgestaltung.Glyphs.")
+                or k == "com.schriftgestaltung.componentsAlignment"
+            )
+            and k != "public.markColor"
+        }
+
+    ufo.lib = {
+        k: v
+        for k, v in ufo.lib.items()
+        if k.startswith("public.")
+        or k.startswith("com.github.googlei18n.ufo2ft.")
+        or (
+            k
+            in {
+                "com.schriftgestaltung.fontMasterID",
+                "com.schriftgestaltung.customParameter.GSFont.disablesLastChange",
+                "com.schriftgestaltung.customParameter.GSFontMaster.paramArea",
+                "com.schriftgestaltung.customParameter.GSFontMaster.paramDepth",
+                "com.schriftgestaltung.customParameter.GSFontMaster.paramOver",
+            }
+        )
+    }
+
+    ufo.save()