#!/usr/bin/python
# vi: ts=4 expandtab

import os
import sys
import re


def parse_requires(fn):
    requires = []
    with open(fn, 'r') as fh:
        lines = fh.read().splitlines()
    for line in lines:
        line = line.strip()
        if not line or line[0] == '#':
            continue
        else:
            requires.append(line)
    return requires


def find_requires(args):
    p_files = []
    if args:
        p_files.append(args[0])
    p_files.append(os.path.join(os.pardir, "Requires"))
    p_files.append(os.path.join(os.getcwd(), 'Requires'))
    found = None
    for fn in p_files:
        if os.path.isfile(fn):
            found = fn
            break
    return found


if __name__ == '__main__':
    run_args = sys.argv[1:]
    fn = find_requires(run_args)
    if not fn:
        sys.stderr.write("'Requires' file not found!\n")
        sys.exit(1)
    else:
        deps = parse_requires(fn)
        for entry in deps:
            print entry