Lay groudwork to Closure compile JavaScript

third_party/closure_compiler/runner/build_runner_jar.py

+#!/usr/bin/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 os
+import shutil
+import subprocess
+import sys
+import tempfile
+
+
+def rel_to_abs(rel_path):
+  script_path = os.path.dirname(os.path.abspath(__file__))
+  return os.path.join(script_path, rel_path)
+
+
+java_bin_path = os.getenv('JAVA_HOME', '')
+if java_bin_path:
+  java_bin_path = os.path.join(java_bin_path, 'bin')
+
+main_class = 'org.chromium.closure.compiler.Runner'
+jar_name = 'runner.jar'
+src_dir = 'src'
+closure_jar_relpath = os.path.join('..', 'compiler', 'compiler.jar')
+src_path = rel_to_abs(src_dir)
+
+
+def run_and_communicate(command, error_template):
+  proc = subprocess.Popen(command, stdout=subprocess.PIPE, shell=True)
+  proc.communicate()
+  if proc.returncode:
+    print >> sys.stderr, error_template % proc.returncode
+    sys.exit(proc.returncode)
+
+
+def build_artifacts():
+  print 'Compiling...'
+  java_files = []
+  for root, dirs, files in sorted(os.walk(src_path)):
+    for file_name in files:
+      java_files.append(os.path.join(root, file_name))
+
+  bin_path = tempfile.mkdtemp()
+  manifest_file = tempfile.NamedTemporaryFile(mode='wt', delete=False)
+  try:
+    manifest_file.write('Class-Path: %s\n' % closure_jar_relpath)
+    manifest_file.close()
+    javac_path = os.path.join(java_bin_path, 'javac')
+    javac_command = '%s -d %s -cp %s %s' % (
+        javac_path, bin_path, rel_to_abs(closure_jar_relpath),
+        ' '.join(java_files))
+    run_and_communicate(javac_command, 'Error: javac returned %d')
+
+    print 'Building jar...'
+    artifact_path = rel_to_abs(jar_name)
+    jar_path = os.path.join(java_bin_path, 'jar')
+    jar_command = '%s cvfme %s %s %s -C %s .' % (
+        jar_path, artifact_path, manifest_file.name, main_class, bin_path)
+    run_and_communicate(jar_command, 'Error: jar returned %d')
+  finally:
+    os.remove(manifest_file.name)
+    shutil.rmtree(bin_path, True)
+
+  print 'Done.'
+
+
+def show_usage_and_die():
+  print 'usage: %s' % os.path.basename(__file__)
+  print 'Builds runner.jar from the %s directory contents' % src_dir
+  sys.exit(1)
+
+
+def main():
+  if len(sys.argv) > 1:
+    show_usage_and_die()
+
+  build_artifacts()
+
+
+if __name__ == '__main__':
+  main()