Get access to keg-only commands from homebrew

keg

#!/usr/bin/env python

import sys
import os
import os.path
import json
import signal
import subprocess

# process arguments
if len(sys.argv) < 2:
    sys.exit(1)

formula = sys.argv[1]
command = formula if (len(sys.argv) == 2 or sys.argv[2:] == '--') else sys.argv[2]
args = sys.argv[3:]

# get the info
try:
    prefix = subprocess.check_output(['brew', '--prefix']).strip()
    info = json.loads(
        subprocess.check_output(['brew', 'info', '--json=v1', formula])
    )
except subprocess.CalledProcessError:
    sys.exit()

# get highest version if installed
try:
    version = info['installed'][-1]['version']
except IndexError:
    print "Error: Not installed: {0}".format(formula)
    sys.exit(1)

path = os.path.join(prefix, 'Cellar', formula, version, 'bin', command)
if not (os.path.exists(path) and os.access(path, os.X_OK)):
    print "Error: Not executable: {0}".format(path)
    sys.exit(1)

# stop python from processing control-C - it's up to the subprocess
def dummy(signum, frame):
    pass
signal.signal(signal.SIGINT, dummy)

# execute the command
sys.exit(subprocess.call([path] + args))