DevTools: Get rid of module initializers in the source tree

Source/devtools/scripts/concatenate_module_scripts.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.
+
+"""
+Concatenates module scripts based on the module.json descriptor.
+Optionally, minifies the result using rjsmin.
+"""
+
+from cStringIO import StringIO
+from os import path
+import os
+import re
+import sys
+
+try:
+    import simplejson as json
+except ImportError:
+    import json
+
+rjsmin_path = path.abspath(path.join(
+        path.dirname(__file__),
+        '..',
+        '..',
+        'build',
+        'scripts'))
+sys.path.append(rjsmin_path)
+import rjsmin
+
+
+def read_file(filename):
+    with open(path.normpath(filename), 'rt') as file:
+        return file.read()
+
+
+def write_file(filename, content):
+    # This is here to avoid overwriting source tree files due to hard links.
+    if path.exists(filename):
+        os.remove(filename)
+    with open(filename, 'wt') as file:
+        file.write(content)
+
+
+def concatenate_scripts(file_names, module_dir, output_dir, output):
+    for file_name in file_names:
+        output.write('/* %s */\n' % file_name)
+        file_path = path.join(module_dir, file_name)
+
+        # This allows to also concatenate generated files found in output_dir.
+        if not path.isfile(file_path):
+            file_path = path.join(output_dir, path.basename(module_dir), file_name)
+        output.write(read_file(file_path))
+        output.write(';')
+
+
+def main(argv):
+    if len(argv) < 3:
+        print('Usage: %s module_json output_file no_minify' % argv[0])
+        return 1
+
+    module_json_file_name = argv[1]
+    output_file_name = argv[2]
+    no_minify = len(argv) > 3 and argv[3]
+    module_dir = path.dirname(module_json_file_name)
+
+    output = StringIO()
+    descriptor = None
+    try:
+        descriptor = json.loads(read_file(module_json_file_name))
+    except:
+        print 'ERROR: Failed to load JSON from ' + module_json_file_name
+        raise
+
+    # pylint: disable=E1103
+    scripts = descriptor.get('scripts')
+    assert(scripts)
+    output_root_dir = path.join(path.dirname(output_file_name), '..')
+    concatenate_scripts(scripts, module_dir, output_root_dir, output)
+
+    output_script = output.getvalue()
+    output.close()
+    write_file(output_file_name, output_script if no_minify else rjsmin.jsmin(output_script))
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))