Switch from jinja to mustache templates

chrome/android/webapk/shell_apk/manifest_processor.py

+#!/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.
+
+"""Expands the ShellApk's AndroidManifest.xml using Mustache template engine."""
+
+import codecs
+import argparse
+import os
+import sys
+
+# Import motemplate from third_party/motemplate
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir,
+                             os.pardir, os.pardir, 'third_party', 'motemplate'))
+import motemplate
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir,
+                             os.pardir, os.pardir, 'build', 'android', 'gyp',
+                             'util'))
+import build_utils
+
+
+def _ParseVariables(variables_arg, error_func):
+  variables = {}
+  for v in build_utils.ParseGnList(variables_arg):
+    if '=' not in v:
+      error_func('--variables argument must contain "=": ' + v)
+    name, _, value = v.partition('=')
+    if value == 'True':
+      # The python implementation of Mustache doesn't consider True to be a
+      # truthy value. Wrap it up as a list to enable us to specify a boolean to
+      # expand a template section.
+      variables[name] = ['True']
+    else:
+      variables[name] = value
+  return variables
+
+
+def main():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--template', required=True,
+                      help='The template file to process.')
+  parser.add_argument('--output', required=True,
+                      help='The output file to generate.')
+  parser.add_argument('--variables', help='Variables to be made available in '
+                      'the template processing environment, as a GN list '
+                      '(e.g. --variables "channel=beta mstone=39")', default='')
+  options = parser.parse_args()
+
+  variables = _ParseVariables(options.variables, parser.error)
+  with open(options.template, 'r') as f:
+    template = motemplate.Motemplate(f.read())
+    render = template.render(variables)
+    with codecs.open(options.output, 'w', 'utf-8') as output_file:
+      output_file.write(render.text)
+
+
+if __name__ == '__main__':
+  main()