#!/usr/bin/env python

'''Basic XSLT previewer'''

__author__ = 'Ryan Blunden'
__copyright__ = 'Copyright 2010, Ryan Blunden'
__license__ = 'GPL'
__email__ = 'ryan.blunden@gmail.com'
__status__ = 'Development'

from lxml import etree
import subprocess, sys

def xslt_preview(xml_file, xslt_file, output_file_path):
    '''
    Perform an XSLT using the supplied XML and XSL file paths,
    saving it to the supplied output file path.
    '''

    xml_root = etree.XML(open(xml_file, 'r').read())
    xslt_root = etree.XML(open(xslt_file, 'r').read())
    transform = etree.XSLT(xslt_root)
    output_file = open(output_file_path, 'w')

    result = etree.tostring(transform(xml_root))
    output_file.write(result)
    output_file.close()


if __name__ == '__main__':
    if len(sys.argv) < 4:
        print 'Usage: %s xml_file xslt_file output_file' % sys.argv[0]
        print 'Example: python xslt.py test-store.xml test-store.xsl test.html'
        sys.exit(1)

    xml_file = sys.argv[1]
    xslt_file = sys.argv[2]
    output_file_path = sys.argv[3]

    xslt_preview(xml_file, xslt_file, output_file_path)