A pod wrapper script which uses 'bundle exec' if a Gemfile is found.

pod

#!/usr/bin/env python

# A wrapper for 'pod' which detects if it should run 'bundle exec pod' or
# use the system 'pod' command, based on the presence of a 'Gemfile'.

# If a Gemfile exists in any directory above pwd, 'bundle exec pod' should
# be used.  Otherwise, the system 'pod' is used.

# Expected behavior:
#    $ pwd
#    /Users/foo/github/some_repo
#    $ pod --version
#    1.4.0
#    $ cd /tmp
#    $ pod --version
#    1.5.3

import os
import sys

def gemfile_exists():
    # Ascend up the directory tree looking for a Gemfile.
    gempath = 'Gemfile'
    while True:
        if os.path.exists(gempath):
            return True
        else:
            if os.path.abspath(gempath) == '/Gemfile':
                return False
            else:
                gempath = '../' + gempath
                continue

if __name__ == "__main__":
    if gemfile_exists():
        cmd = ['bundle', 'exec', 'pod'] + sys.argv[1:]
    else:
        scriptdir = os.path.dirname(__file__)
        pathchunks = os.environ["PATH"].split(':')
        if scriptdir in pathchunks:
            os.environ["PATH"] = ':'.join(
                filter(lambda x: x != scriptdir, pathchunks)
            )
        else:
            # We can't find an exact match in $PATH, so fall back to the
            # alternate strategy of chopping one leading component from $PATH
            # and recursing.
            # (To instead chop a trailing component, change '[1:]' to '[:1]')
            os.environ["PATH"] = ':'.join(pathchunks[1:])
        cmd = ['pod'] + sys.argv[1:]

    os.execvp(cmd[0], cmd)