[NaCl SDK] Generate NOTICE file automatically.

native_client_sdk/src/build_tools/generate_notice.py

Index: native_client_sdk/src/build_tools/generate_notice.py
diff --git a/native_client_sdk/src/build_tools/generate_notice.py b/native_client_sdk/src/build_tools/generate_notice.py
new file mode 100755
index 0000000000000000000000000000000000000000..ffc376bcc8093495eede49c5225b9f5cd98c2d68
--- /dev/null
+++ b/native_client_sdk/src/build_tools/generate_notice.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+"""Build the NOTICE file distributed with the NaCl SDK from a set of given
+license files."""
+
+import optparse
+import os
+import sys
+
+
+def Trace(msg):
+  if Trace.verbose:
+    print msg
+
+Trace.verbose = False
+
+
+def FindFiles(files):
+  found = [f for f in files if os.path.exists(f)]
+
+  if Trace.verbose:
+    for f in sorted(set(files) - set(found)):
+      Trace('Skipping %s. File doesn\'t exist.\n' % (f,))
+
+  return found
+
+
+def CreateLicenseDict(files):
+  # Many of the license files are duplicates. Create a map of license text to
+  # filename.
+  license_dict = {}
+  for filename in files:
+    license_text = open(filename).read()
+    license_dict.setdefault(license_text, []).append(filename)
+
+  # Flip the dictionary (map tuple of filenames -> license text).
+  return dict((tuple(value), key) for key, value in license_dict.iteritems())
+
+
+def WriteLicense(output_file, root, license_text, license_filenames):
+  Trace('Writing license for files:\n' + '\n'.join(license_filenames))
+  output_file.write('=' * 70 + '\n')
+  for filename in sorted(license_filenames):
+    filename = os.path.relpath(filename, root)
+    license_dir = os.path.dirname(filename)
+    if not license_dir:
+      license_dir = 'native_client_sdk'
+
+    output_file.write('%s is licensed as follows\n' % (license_dir,))
+    output_file.write('  (Cf. %s):\n' % (filename,))
+  output_file.write('=' * 70 + '\n')
+  output_file.write(license_text)
+  output_file.write('\n\n\n')
+
+
+def Generate(output_filename, root, files):
+  found_files = FindFiles(files)
+  license_dict = CreateLicenseDict(found_files)
+  with open(output_filename, 'w') as output_file:
+    for license_filenames in sorted(license_dict.iterkeys()):
+      license_text = license_dict[license_filenames]
+      WriteLicense(output_file, root, license_text, license_filenames)
+
+
+def main(args):
+  parser = optparse.OptionParser()
+  parser.add_option('-v', '--verbose', help='Verbose output.',
+      action='store_true')
+  parser.add_option('-o', '--output', help='Output file')
+  parser.add_option('--root', help='Root for all paths')
+
+  options, args = parser.parse_args(args)
+  Trace.verbose = options.verbose
+
+  if not options.output:
+    parser.error('No output file given. See -o.')
+  if not options.root:
+    parser.error('No root directory given. See --root.')
+
+  Generate(options.output, options.root, args)
+  Trace('Done.')
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))