#! /usr/bin/python

from os.path import exists
from subprocess import call
from sys import argv
from re import compile

OLD = '/usr/share/python/dh_python2'
NEW = '/usr/share/dh-python/dh_python2'
has_dhpython = compile(r'(^|:|\s|,)dh-python($|\s|,|\()').search

binary = OLD
if exists(NEW) and exists('debian/control'):
with open('debian/control', 'r') as fp:
inside = False
for line in fp:
if not line:
break
line_lower = line.lower()
if inside:
if line.startswith((' ', "\t")):
if has_dhpython(line):
binary = NEW
break
continue
elif line.startswith('#'):
continue
inside = False
if line_lower.startswith(('build-depends:', 'build-depends-indep:')):
if has_dhpython(line):
binary = NEW
break
inside = True

argv[0] = binary
exit(call(argv))