changes-from-deb

#!/usr/bin/python

from debian.changelog import Changelog, ChangelogParseError
import re
import sys


def gen_changelog(infile, outfile):
    date_re = re.compile(r'(?P<dayname>\w\w\w), (?P<day>\d\d)'
                         r' (?P<monthname>\w\w\w) (?P<year>\d+)')
    try:
        chlog = Changelog(infile)
    except ChangelogParseError, exc:
        sys.stderr.write("%s: %s\n" % (infile.name, str(exc)))
        sys.exit(1)

    for entry in chlog:
        match = date_re.match(entry.date)
        date = u'%(dayname)s %(monthname)s %(day)s %(year)s' % match.groupdict()
        changes = []
        author = u""
        # Some versions of debian.changelog.Changelog return str objects,
        # other (later) versions return unicode objects.
        for line in entry.changes():
            if not line.strip():
                continue
            if isinstance(line, str):
                line = line.decode('utf-8')
            if line.startswith(u"  * "):
                changes.append(u"- %s%s" % (author, line[4:].strip()))
                author = u""
            elif line.startswith(u"  [" ):
                author = u"%s " % line.strip()
            else:
                changes.append(u"  " + line.strip())
        if isinstance(entry.author, str):
            entry.author = entry.author.decode('utf-8')
        rpm_entry = u"* %s %s - %s\n%s\n\n" \
            % (date, entry.author, entry.version, u'\n'.join(changes))
        outfile.write(rpm_entry.encode('utf-8'))


def gen_changelog_file(input_filename, output_filename):
    try:
        infile = open(input_filename)
    except IOError, exc:
        sys.stderr.write("Could not open %s: %s\n" % (input_filename, exc))
        sys.exit(1)

    try:
        outfile = open(output_filename, 'w')
    except IOError, exc:
        sys.stderr.write("Could not open %s for writing: %s\n"
                         % (output_filename, exc))
        sys.exit(1)

    with infile:
        with outfile:
            gen_changelog(infile, outfile)


if __name__ == "__main__":
    if len(sys.argv) != 3:
        sys.stderr.write("Usage: %s INFILE OUTFILE\n" % sys.argv[0])
        sys.exit(2)

    gen_changelog_file(sys.argv[1], sys.argv[2])