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

try:
    # check to see if the cheat package is available
    import cheatsheets
    cheat_dir = cheatsheets.cheat_dir
    cheatsheets = [(f, cheat_dir) for f in os.listdir(cheat_dir) if '.' not in f]
except ImportError:
    cheatsheets = []

# construct the path to the cheat directory
user_cheat_dir = os.path.join(os.path.expanduser('~'), '.cheat')

# list the files in the cheat directory
# add the user's cheat files if they have a ~/.cheat directory
if os.path.isdir(user_cheat_dir):
    cheatsheets += [(f, user_cheat_dir) for f in os.listdir(user_cheat_dir)
                    if '.' not in f]

# add the cheat files from the directory specified in $CHEATPATH
if 'CHEATPATH' in os.environ and os.environ['CHEATPATH']:
    path = os.environ['CHEATPATH'].split(os.pathsep)
    if os.path.isdir(path):
        cheatsheets += [(f, path) for f in os.listdir(path) if '.' not in f]

# remove any duplicates
def remove_duplicates(cheats):
    sheets = []
    for i, sheet in enumerate(cheats):
        if sheet[0] not in [c[0] for c in sheets]:
            sheets.append(sheet)
    return sheets

cheatsheets = remove_duplicates(cheatsheets)
cheatsheets.sort()

# assemble a keyphrase out of all params passed to the script
keyphrase  = ' '.join(sys.argv[1:])

# verify that we have at least one cheat directory
if not cheatsheets:
    print >> sys.stderr, 'The ~/.cheat directory does not exist or the CHEATPATH variable is not set.'
    exit()

# assemble a keyphrase out of all params passed to the script
keyphrase = ' '.join(sys.argv[1:])

# print help if requested
if keyphrase.lower() in ['', 'cheat', 'help', '-h', '-help', '--help']:
    print "Usage: cheat [keyphrase]\n"
    print "Available keyphrases:"
    max_command = max([len(sheet[0]) for sheet in cheatsheets]) + 3
    print '\n'.join(sorted([ '%s [%s]' % (sheet[0].ljust(max_command), sheet[1]) for sheet in cheatsheets]))
    exit()

sheet_found = False
# print the cheatsheet if it exists
for sheet in cheatsheets:
    if keyphrase == sheet[0]:
        cheatsheet_filename = os.path.join(sheet[1], keyphrase)
        with open(cheatsheet_filename, 'r') as cheatsheet:
            print cheatsheet.read()
            sheet_found = True

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