InkscapeExtensionUpgrade.py

import re
import os
import sys
import shutil
from tempfile import mkstemp
import subprocess

# *************************************************************
# The inkscape extension
# *************************************************************
class UpgradeExtension():
    def __init__(self):
        self.searchReplace = [
        ["^([\\b]*)str[\\s]","type=\\1str"],
        ["OptionParser.add_option","arg_parser.add_argument"],
        ["action=\"store\"[\\b]*[,]?[\\s]*",""],
        [",[\\b]*,",","],
        ["type=\"inkbool\"","type=inkex.Boolean"],
        ["^([\\b]*)print (.+)","\\1print\\(\\2\\)"],
        ["type=\"(.*)\"","type=\\1"],
        ["type=string","type=str"],
        ["isinstance\\((.*)\\.tag, basestring\\)","isinstance\\(\\1\\.tag, str\\)"],
        ["isinstance\\((.*)\\.tag, unicode\\)","isinstance\\(\\1\\.tag, str\\)"],
        ["isinstance\\((.*)\\.tag, stdout\\)","isinstance\\(\\1\\.tag, sys.stdout.buffer\\)"]]

    #TODO: Get rid of dest and intead create a bakup and just replace the origional,
    # or just replace the oriugional and assume that the user already has a source copy.
    # probably a good idea to have a warn prompt first.
    def upgrade(self, source):
        """Upgrades a Inkscape 4.x extension to a 1.x one

        Args:
            source  (str): input filename, source will be over written.
        """
        subprocess.call(["2to3","-w","-f","all","-f","buffer","-f","idioms","-f","set_literal","-f","ws_comma", source])

        with open(source, 'r') as fin:

            fd, name = mkstemp()

            with open(name, 'w') as fout:

                for line in fin:
                    out = line
                    for pattern, replace in self.searchReplace:
                        out = re.sub(pattern, replace, out)
                    fout.write(out)
                    fout.writelines(fin.readlines())

            os.close(fd)

        shutil.move(name, source)


upgrader = UpgradeExtension()
if len(sys.argv) == 2:
    upgrader.upgrade(sys.argv[1])
quit()