Translate *.po file to asterisk strings.

postar.py

#!/usr/bin/python
import sys, getopt
import re
from string import maketrans

intab = "mnbvcxzlkjhgfdsapoiuytrewq0987654321MNBVCXZLKJHGFDSAPOIUYTREWQ"
outtab = len(intab) * "*"
trantab = maketrans(intab, outtab)
pattern = re.compile('\${.*}')

def postarify(inputfile, outputfile):
    infile = file(inputfile, 'r')
    outfile = file(outputfile, 'w')

    with infile as lines:
        prev_line = ""
        for line in lines:
            if prev_line.startswith('msgid'):
                current_line = prev_line.translate(trantab)
                # Copy the `${...}` parts. Because we don't want those translated.
                iterator = pattern.finditer(prev_line)
                for match in iterator:
                    start, end = match.span()
                    var = prev_line[start:end]
                    current_line = current_line[:start] + var + current_line[start+len(var):]
                current_line = 'msgstr' + current_line[5:]
                outfile.write(current_line)
            else:
                outfile.write(line)
            prev_line = line
    outfile.close()

def main(argv):
   inputfile = ''
   outputfile = ''
   try:
      opts, args = getopt.getopt(argv,"i:o:",["ifile=","ofile="])
   except getopt.GetoptError:
      print('postar.py -i <inputfile> -o <outputfile>')
      sys.exit(2)
   for opt, arg in opts:
      if opt == '-h':
         print('postar.py -i <inputfile> -o <outputfile>')
         sys.exit()
      elif opt in ("-i", "--infile"):
         inputfile = arg
      elif opt in ("-o", "--outfile"):
         outputfile = arg
   if inputfile and outputfile:
        if inputfile == outputfile:
            print("Input file and output file may not be the same file.")
        else:
            postarify(inputfile, outputfile)

if __name__ == "__main__":
   main(sys.argv[1:])