#!/usr/bin/env python
import sys, os.path, re, urllib
if len(sys.argv) <= 1:
    print "https://hack.esolangs.org/repo/"
else:
    f = os.path.abspath(sys.argv[1])
    f = re.sub(r"^/+hackenv/", "", f)
    if re.match(r"/|(?:\.hg|tmp)(?:/|$)",f):
        sys.exit("File is outside web-viewable filesystem repository.")
    else:
        print ("https://hack.esolangs.org/repo/log/tip/" +
            urllib.quote(f))