Fetch and compile zh_CN po files of Etoys

#!/usr/bin/env python2

import os.path
import subprocess


PO_DIR = "po-files"

def checkout():
    subprocess.call([ "svn",
                      "checkout",
                      "http://etoys.squeak.org/svn/trunk/po/zh_CN/",
                      PO_DIR ])

def update():
    subprocess.call([ "svn", "update", PO_DIR ])


def compile_po():
    for fname in os.listdir(PO_DIR):
        if not fname.endswith(".po"):
            continue

        po = os.path.join(PO_DIR, fname)
        mo = fname.replace(".po", ".mo")
        subprocess.call([ "msgfmt", "-o", mo, po ])


if __name__ == '__main__':
    if os.path.exists(PO_DIR):
        update()
    else:
        checkout()

    compile_po()