#!/usr/bin/env python
import os
import sys

# assemble a keyphrase out of all params passed to the script
keyphrase = ' '.join(sys.argv[1:])
cheat_dir = os.path.expanduser('~') + '/.cheat/'

# verify that the ~/.cheat directory exists
if not os.path.isdir(cheat_dir):
    print >> sys.stderr, 'The ~/.cheat directory does not exist.'
    exit()

# list the files in the ~/.cheat directory
cheatsheets = os.listdir(cheat_dir)
cheatsheets.sort()

# print help if requested
if keyphrase in ['', 'help', '--help', '-h']:
    print "Usage: cheat [keyphrase]\n"
    print "Available keyphrases:"
    print "\n".join(cheatsheets)
    exit()

# print the cheatsheet if it exists
if keyphrase in cheatsheets:
    with open (cheat_dir + keyphrase, 'r') as cheatsheet:
        print cheatsheet.read()

# if it does not, say so
else:
    print 'No cheatsheet found.'