build: Added "uglify-js" as optional compressor

build/build.py

@@ -32,6 +32,13 @@ def build(config_file = None, output_file = None, options = None):
     except ImportError:
         print "No minimize"
 
+    try:
+        import uglify_js
+        uglify_js.check_available()
+        have_compressor.append("uglify-js")
+    except Exception, E:
+        print "No uglify-js (%s)" % E
+
     use_compressor = None
     if options.compressor and options.compressor in have_compressor:
         use_compressor = options.compressor
@@ -52,7 +59,7 @@ def build(config_file = None, output_file = None, options = None):
 
     print "Merging libraries."
     try:
-        if use_compressor == "closure":
+        if use_compressor == "closure" or use_compressor == 'uglify-js':
             sourceFiles = mergejs.getNames(sourceDirectory, configFilename)
         else:
             merged = mergejs.run(sourceDirectory, None, configFilename)
@@ -107,6 +114,14 @@ def build(config_file = None, output_file = None, options = None):
             print "\nAbnormal termination due to compilation errors." 
             sys.exit("ERROR: Closure Compilation failed! See compilation errors.") 
         print "Closure Compilation has completed successfully."
+    elif use_compressor == "uglify-js":
+        minimized = uglify_js.compile(sourceFiles)
+        if minimized is None:
+            print "\nAbnormal termination due to compilation errors."
+            sys.exit("ERROR: Uglify JS compilation failed! See compilation errors.")
+
+        print "Uglify JS compilation has completed successfully."
+
     else: # fallback
         minimized = merged 
 

tools/uglify_js.py

@@ -0,0 +1,35 @@
+"""Utility to use the Uglify JS Compiler CLI from Python."""
+
+import logging
+import subprocess
+
+
+def check_available():
+    """ Returns whether the uglify-js tool is available. """
+    subprocess.check_output(['which', 'uglifyjs'])
+
+
+def compile(source_paths, flags=None):
+    """
+    Prepares command-line call to uglify-js compiler.
+
+    Args:
+      source_paths: Source paths to build, in order.
+      flags: A list of additional flags to pass on to uglify-js.
+
+    Returns:
+      The compiled source, as a string, or None if compilation failed.
+    """
+
+    args = ['uglifyjs']
+    args.extend(source_paths)
+    args.extend(['-c', '-m'])
+    if flags:
+        args += flags
+
+    logging.info('Compiling with the following command: %s', ' '.join(args))
+
+    try:
+        return subprocess.check_output(args)
+    except subprocess.CalledProcessError:
+        return