Ferramenta para minificar arquivos javascript e css usando o YUI Compressor

minify.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-
"""
Tool for minifing static files with yui compressor
"""

import os
from subprocess import call
from optparse import OptionParser


def main():
    """
    Main execution of tool
    """
    parser = OptionParser(
        usage="Usage: %prog [options] --dir=SOURCE_DIR",
        version="%prog 0.1"
    )

    parser.set_defaults(
        compressor="/home/hugo/tools/yuicompressor-2.4.7.jar"
    )

    parser.add_option(
        "--dir",
        "-d",
        dest="dir",
        help="directory to search for javascript or css files"
    )

    parser.add_option(
        "--compressor",
        "-c",
        dest="compressor",
        help="path to the yui compressor jar file"
    )

    options = parser.parse_args()[0]

    if not options.dir:
        parser.error("You have to specify a directory.")

    if not os.path.isfile(options.compressor):
        parser.error("YUI compressor not found.")

    options.dir = os.path.abspath(options.dir)

    minify_files(options)


def minify_files(options):
    """
    Minifing files based on the parsed options
    """
    for filename in [filename
                     for filename
                     in os.listdir(options.dir)
                     if file_not_minified(filename)]:

        print "Minifing file: %s" % os.path.join(options.dir, filename)

        file_input = os.path.join(options.dir, filename)
        file_output = os.path.join(options.dir,
                                   os.path.splitext(filename)[0]
                                   + ".min%s" % os.path.splitext(filename)[1])

        call(["java",
              "-jar",
              options.compressor,
              file_input,
              "-o",
              file_output])

        os.remove(file_input)


def file_not_minified(filename):
    """
    Check if the file hasn't been minified
    """
    filename_pieces = filename.split(".")
    return len(filename_pieces) == 2 and filename_pieces[1] in ["js", "css"]


if __name__ == "__main__":
    main()