r"""Combine all sheets referred to a given CSS *proxy* sheet
into a single new sheet.

- no ``url()`` values are adjusted so currently when using relative references
  for e.g. images it is best to have all sheets in a single folder
- in @import rules only relative paths do work for now but should be used
  anyway
- messages are send to stderr
- output to stdout.

Example::

    csscombine sheets\csscombine-proxy.css -m -t ascii -s utf-8
        1>combined.css 2>log.txt

results in log.txt::

    COMBINING sheets/csscombine-proxy.css
    USING SOURCE ENCODING: css
    * PROCESSING @import sheets\csscombine-1.css
    * PROCESSING @import sheets\csscombine-2.css
    INFO    Nested @imports are not combined: @import "1.css";
    SETTING TARGET ENCODING: ascii

and combined.css::

    @charset "ascii";@import"1.css";@namespaces2"uri";s2|sheet-1\
    {top:1px}s2|sheet-2{top:2px}proxy{top:3px}

or without option -m::

    @charset "ascii";
    @import "1.css";
    @namespace s2 "uri";
    @namespace other "other";
    /* proxy sheet were imported sheets should be combined */
    /* non-ascii chars: \F6 \E4 \FC  */
    /* @import "csscombine-1.css"; */
    /* combined sheet 1 */
    s2|sheet-1 {
        top: 1px
        }
    /* @import url(csscombine-2.css); */
    /* combined sheet 2 */
    s2|sheet-2 {
        top: 2px
        }
    proxy {
        top: 3px
        }

"""

__all__ = ['csscombine']

import optparse
import sys

from cssutils.script import csscombine


def main(args=None):
    usage = "usage: %prog [options] [path]"
    parser = optparse.OptionParser(usage=usage)
    parser.add_option(
        '-u',
        '--url',
        action='store',
        dest='url',
        help='URL to parse (path is ignored if URL given)',
    )
    parser.add_option(
        '-s',
        '--sourceencoding',
        action='store',
        dest='sourceencoding',
        help='encoding of input, defaulting to "css". '
        'If given overwrites other encoding information like @charset declarations',
    )
    parser.add_option(
        '-t',
        '--targetencoding',
        action='store',
        dest='targetencoding',
        help='encoding of output, defaulting to "UTF-8"',
        default='utf-8',
    )
    parser.add_option(
        '-m',
        '--minify',
        action='store_true',
        dest='minify',
        default=False,
        help='saves minified version of combined files, defaults to False',
    )
    options, path = parser.parse_args()

    if options.url:
        print(
            csscombine(
                url=options.url,
                sourceencoding=options.sourceencoding,
                targetencoding=options.targetencoding,
                minify=options.minify,
            )
        )
    elif path:
        print(
            csscombine(
                path=path[0],
                sourceencoding=options.sourceencoding,
                targetencoding=options.targetencoding,
                minify=options.minify,
            )
        )
    else:
        parser.error('no path or URL (-u) given')


if __name__ == '__main__':
    sys.exit(main())