#!/usr/bin/env python3

""" Converts an UTF-8 text file to an ASCII file with hexadecimal
Numeric Character References (like œ). """

import sys
import re

extension = re.compile("^(.*)\.([a-z0-9_-]+)$", re.IGNORECASE)

def convert(thematch):
    codepoint = int(thematch.group(1), 16)
    return chr(codepoint)

for ifilename in sys.argv[1:]:
    print("Converting %s..." % ifilename)
    match = extension.search (ifilename)
    if match:
        ext_ifile = match.group(2)
        ofilename = match.group(1) + "-ncr." + ext_ifile
    else:
        ofilename = ifilename + "-ncr"
    ifile = open(ifilename, "r")
    ofile = open(ofilename, "w")
    data = ifile.read()
    for ch in data:
        if ord(ch) > 127:
            ch = "&#x%x;" % ord(ch)
        ofile.write(ch)
    ifile.close()
    ofile.close()