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"""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
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