#!/usr/bin/env python3

import sys
import xml.etree.cElementTree as et
from optparse import OptionParser

def main():
    parser = OptionParser()
    parser.add_option('-c', '--changeattributes', dest='change', action="append", nargs=3)
    parser.add_option('-g', '--gentooclasspath', dest="gcp", action="store_true", default=False)
    parser.add_option('-e', '--encoding', dest="encoding")
    (options, args) = parser.parse_args()

    changes = []
    if options.change:
        for c in options.change:
            changes.append((c[0].split(),c[1], c[2]))

    gcp = options.gcp
    gcp_str = '${gentoo.classpath}'
    gcp_sub = et.Element('classpath', path=gcp_str)

    for file in args:
        tree = et.ElementTree(file=file)
        if gcp or options.encoding:
            for javac in tree.getiterator('javac'):
                if gcp:
                    javac.attrib['classpath'] = gcp_str
                        if options.encoding:
                            javac.attrib['encoding'] = options.encoding
                for javadoc in tree.getiterator('javadoc'):
                    if gcp:
                        javadoc.attrib['classpath'] = gcp_str
                        if options.encoding:
                            javadoc.attrib['encoding'] = options.encoding
        for c in changes:
            elems, attr, value = c
                for elem in elems:
                    for e in tree.getiterator(elem):
                        e.attrib[attr] = value
        for junit in tree.getiterator('junit'):
            if gcp:
                junit.append(gcp_sub)
                junit.attrib['haltonfailure'] = 'true'

        with open(file, 'w') as f:
            tree.write(f)

if __name__ == '__main__':
    main()