Util to renamed the waved flags

rename_emoji.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+# Copyright 2020 Google, Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""One-off tool to rename flags to the emoji_u format.
+
+Delete late, use the proper emoji_u naming ongoing.
+"""
+
+
+import os
+from pathlib import Path
+
+
+# Some flags have especially fun RGIs
+_FUN_RGIS = {
+    "GB-ENG": (0x1f3f4, 0xe0067, 0xe0062, 0xe0065, 0xe006e, 0xe0067, 0xe007f),
+    "GB-SCT": (0x1f3f4, 0xe0067, 0xe0062, 0xe0073, 0xe0063, 0xe0074, 0xe007f),
+    "GB-WLS": (0x1f3f4, 0xe0067, 0xe0062, 0xe0077, 0xe006c, 0xe0073, 0xe007f),
+}
+
+
+def _is_legacy_flag(p):
+    return p.stem in _FUN_RGIS or (
+        len(p.stem) == 2 and all('A' <= c <= 'Z' for c in p.stem)
+    )
+
+
+def _flag_rename(f):
+  """Converts a file name from two-letter upper-case ASCII to our expected
+  'emoji_uXXXXX_XXXXX form, mapping each character to the corresponding
+  regional indicator symbol."""
+
+  cp_strs = []
+  name = f.stem
+  ext = f.suffix
+  if name not in _FUN_RGIS:
+    if len(name) != 2:
+      raise ValueError('illegal flag name "%s"' % f)
+    for cp in name:
+      if not ('A' <= cp <= 'Z'):
+        raise ValueError('illegal flag name "%s"' % f)
+      ncp = 0x1f1e6 - 0x41 + ord(cp)
+      cp_strs.append("%04x" % ncp)
+  else:
+    cp_strs = ["%04x" % cp for cp in _FUN_RGIS[name]]
+  return f.parent / ('emoji_u%s%s' % ('_'.join(cp_strs), ext))
+
+
+def main():
+  for file in Path("third_party/waved-flags").glob("**/*.*"):
+    if _is_legacy_flag(file):
+        modern_name = _flag_rename(file)
+        print(file, "=>", modern_name)
+        file.rename(modern_name)
+
+
+if __name__ == '__main__':
+  main()