#!/usr/bin/env python3
"""mkpre.py: Convert ASCII art into something that groff can render to
text, HTML, or postscript/pdf

Copyright (C) 2006 Jeff EpleR
License: GPL V2
"""

def substall(s, r):
    for a, b in r: s = s.replace(a, b)
    return s

def mkpre(s):
    msubst = [('\\', '\\\\'), (' ', '\\ ')]
    hsubst = [('&', '&amp;'), ('<', '&lt;'), ('>', '&gt;'),('  ', ' &nbsp;'), ('\n', '<BR>'), ('\\', '&#92;')]

    h = "".join(s)
    print(".ie '\\*[.T]'html' .HTML <PRE>%s</PRE>" % substall(h, hsubst))
    print(".el \\{\\")
    print(".ft CR")
    for i, line in enumerate(s):
        if i != 0:
            print(r".PP")
        print(substall(line.strip("\n"), msubst))
    print(".ft R")
    print(r"\}")

import sys
mkpre(list(sys.stdin))