Provide script/gypi support for manifest generation

chrome/browser/resources/chromeos/chromevox/tools/generate_manifest.py

+#!/usr/bin/env python
+
+# Copyright 2014 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.
+
+import json
+import io
+import optparse
+import os
+import sys
+
+jinja2_path = os.path.normpath(os.path.join(os.path.abspath(__file__),
+                           *[os.path.pardir] * 7 + ['third_party']))
+nom_path = os.path.normpath(os.path.join(os.path.abspath(__file__),
+    *[os.path.pardir] * 7 + ['tools/json_comment_eater']))
+sys.path.insert(0, jinja2_path)
+sys.path.insert(0, nom_path)
+import jinja2
+from json_comment_eater import Nom
+
+
+'''Generate an extension manifest based on a template.'''
+
+
+def processJinjaTemplate(input_file, output_file, context):
+  (template_path, template_name) = os.path.split(input_file)
+  env = jinja2.Environment(loader=jinja2.FileSystemLoader(template_path))
+  template = env.get_template(template_name)
+  rendered = template.render(context)
+  rendered_without_comments = Nom(rendered)
+  # Simply for validation.
+  json.loads(rendered_without_comments)
+  with io.open(output_file, 'w', encoding='utf-8') as manifest_file:
+    manifest_file.write(rendered_without_comments)
+
+
+def main():
+  parser = optparse.OptionParser(description=__doc__)
+  parser.usage = '%prog [options] <template_manifest_path>'
+  parser.add_option(
+      '-o', '--output_manifest', action='store', metavar='OUTPUT_MANIFEST',
+      help='File to place generated manifest')
+  parser.add_option(
+      '-g', '--is_guest_manifest', action='store', metavar='GUEST_MANIFEST',
+      help='Generate a guest mode capable manifest')
+
+  options, args = parser.parse_args()
+  if len(args) != 1:
+    print >>sys.stderr, 'Expected exactly one argument'
+    sys.exit(1)
+  processJinjaTemplate(args[0], options.output_manifest, parser.values.__dict__)
+
+if __name__ == '__main__':
+  main()