expandalias

#!/usr/bin/env python
import sys
import subprocess
import re

cmd = ' '.join(sys.argv[1:])

lines = subprocess.Popen(
    "shopt -s expand_aliases && source ~/.bash_profile && alias",
    shell=True,
    stdout=subprocess.PIPE,
    stderr=subprocess.STDOUT).stdout.readlines()

alias = {}

for line in lines:
    m = re.search('([^=]+)=\'(.*)\'', line)
    if m:
        alias[m.group(1)] = m.group(2)

def value_contains_key(key):
    value = alias[key]
    return key in value.split(' ')

def substitue_value(value):
    return ' '.join([(alias[s] if s in alias else s) for s in value.split(' ')])


def substitute_all(force=False):
    done = True
    for key, value in alias.iteritems():
        new_val = substitue_value(value)
        if new_val != alias[key] and (force or not value_contains_key(key)):
            alias[key] = new_val
            done = False
    return done

done = substitute_all(True)

while not done:
    done = substitute_all()

print substitue_value(cmd)