path.py

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#!/usr/bin/env python
# -*- Python -*-
# -*- coding: utf-8 -*-

'''rtshell

Copyright (C) 2009-2014
    Geoffrey Biggs
    RT-Synthesis Research Group
    Intelligent Systems Research Institute,
    National Institute of Advanced Industrial Science and Technology (AIST),
    Japan
    All rights reserved.
Licensed under the Eclipse Public License -v 1.0 (EPL)
http://www.opensource.org/licenses/eclipse-1.0.txt

Functions for dealing with input paths.

'''


import os


ENV_VAR='RTCSH_CWD'


def cmd_path_to_full_path(cmd_path):
    '''Given a path from the user, returns a suitable full path based on the
    value of the environment variable specified in ENV_VAR.

    '''
    if cmd_path.startswith('/'):
        return cmd_path
    if ENV_VAR in os.environ and os.environ[ENV_VAR]:
        if os.environ[ENV_VAR].endswith('/') or cmd_path.startswith('/'):
            return os.environ[ENV_VAR] + cmd_path
        else:
            return os.environ[ENV_VAR] + '/' + cmd_path
    # If ENV_VAR is not set, assume the current working dir is the root dir
    return '/' + cmd_path


# vim: tw=79