Machine Translation of .po files with Google Translate

## translate.py
#### Requires ####
# goslate==1.3.0
# polib==1.0.5
#### / ####

import os, sys
import goslate

import argparse
import polib
import time
import datetime
import pprint
import shutil

# cli example:
# python translate.py --inpath=src/a0.po --outpath=ext/a0.po --lang=ja --whoami=myname@gmail.com

# Designed to don't break original po file (include comments etc)

parser = argparse.ArgumentParser(description="Machine Translation of Django's PO Files")
parser.add_argument('--inpath', help="Path to the INPUT po file", required=True)
parser.add_argument('--outpath', help="Path to the OUTPUT po file", required=True)
parser.add_argument('--lang', help="Destination language ISO-3166-2alpha code", required=True)
parser.add_argument('--whoami', help="Your email address", default="you@example.com")
args = parser.parse_args()

gs = goslate.Goslate()

input_file = polib.pofile(args.inpath)

time.sleep(1)

# build translation
c=0
translated = []
for entry in input_file:
    ##pprint.pprint ([entry.msgid])
    translated.append( [
      str(entry.msgid),
      str(gs.translate(entry.msgid, args.lang))
    ])
    time.sleep(1)
    c += 1

# make output
if os.path.exists(args.outpath):
  os.remove(args.outpath)

# replace output
fr = open(args.inpath,'r')
fw = open(args.outpath,'w')

r = 0
is_body = 0
for row in fr:
    inline = row.strip()
    print (inline)

    if inline == '':
      is_body += 1

    if inline == 'msgstr ""':
      if is_body == 0:
        # write other lines
        fw.write(inline + "\n")
      else:
        # write translation
        fw.write('msgstr "' + translated[r][1].replace('"', '\\"') +  '"' + "\n")
        r += 1
    else:
      # write other lines
      fw.write(inline + "\n")

fr.close()
fw.close()

print ("Done. Translated %s messages" % c)