Experiment using browserify with django-compressor

compress.py

import logging
import subprocess

from compressor.exceptions import FilterError
from compressor.filters import CompilerFilter
from django.conf import settings

logger = logging.getLogger("coconut.helpers.compressor")


def npm_install():
    '''run npm install in cwd'''
    logger.info('running `npm install`')

    command = '/usr/bin/npm install'
    if settings.PRODUCTION:
        command = 'sudo ' + command
    try:
        proc = subprocess.Popen(
            command,
            shell=True, cwd=settings.BROWSERIFY_DIR, stdout=subprocess.PIPE,
            stdin=subprocess.PIPE, stderr=subprocess.PIPE)

        filtered, err = proc.communicate()
    except (IOError, OSError) as e:
        raise FilterError('Running `npm install` failed: %s' % str(e))
    else:
        if proc.wait() != 0:
            raise FilterError(err)

# run on import
npm_install()


class BrowserifyFilter(CompilerFilter):
    command = 'node_modules/.bin/browserify {infile} -o {outfile}'

    def __init__(self, *args, **kwargs):
        super(BrowserifyFilter, self).__init__(*args, **kwargs)
        self.cwd = settings.BROWSERIFY_DIR

    def input(self, **kwargs):
        # if compress_offline=True, run here too. Seems to be necessary.
        if settings.COMPRESS_OFFLINE:
            npm_install()

        return super(BrowserifyFilter, self).input(**kwargs)