Reland of Deduplicate Monochrome locale .paks

tools/resources/filter_resource_whitelist.py

Index: tools/resources/filter_resource_whitelist.py
diff --git a/tools/resources/filter_resource_whitelist.py b/tools/resources/filter_resource_whitelist.py
new file mode 100755
index 0000000000000000000000000000000000000000..415444e9ee0260b6c48de6cf65e9ee43f45fab12
--- /dev/null
+++ b/tools/resources/filter_resource_whitelist.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# Copyright 2017 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+__doc__ = """filter_resource_whitelist.py [-h] [--input INPUT]

[Dirk Pranke, 2017/07/14 23:01:51]

Nit: you don't need to (and shouldn't) assign to __doc__ here; it's set
automatically.

[F, 2017/07/17 14:35:14]

Done.

+[--filter FILTER] [--output OUTPUT]
+
+INPUT specifies a resource whitelist file containing resource IDs that should
+be whitelisted, where each line of INPUT contains a single resource ID.
+
+FILTER specifies a resource whitelist file containing resource IDs that should
+not be whitelisted, where each line of FILTER contains a single resource ID.
+
+Filters a resource whitelist by removing resource IDs that are contained in a
+another resource whitelist.
+
+This script is used to generate Monochrome's locale paks.
+"""
+
+import argparse
+import sys
+
+
+def main():
+  parser = argparse.ArgumentParser(usage=__doc__)
+  parser.add_argument(
+      '--input', type=argparse.FileType('r'), required=True,
+      help='A resource whitelist where each line contains one resource ID. '
+           'These IDs, excluding the ones in FILTER, are to be included.')
+  parser.add_argument(
+      '--filter', type=argparse.FileType('r'), required=True,
+      help='A resource whitelist where each line contains one resource ID. '
+           'These IDs are to be excluded.')
+  parser.add_argument(
+      '--output', type=argparse.FileType('w'), default=sys.stdout,
+      help='The resource list path to write (default stdout)')
+
+  args = parser.parse_args()
+
+  input_resources = list(int(resource_id) for resource_id in args.input)
+  filter_resources = set(int(resource_id) for resource_id in args.filter)
+  output_resources = [resource_id for resource_id in input_resources
+                      if resource_id not in filter_resources]
+
+  for resource_id in sorted(output_resources):
+    args.output.write('%d\n' % resource_id)
+
+if __name__ == '__main__':
+  main()