# -------------------------------------------------------------------------
# walkUp
# -------------------------------------------------------------------------
def walkUp(inPath, dirTag='foo'):
    '''
    Mimic something like os.walk, but walks up the directory tree
    Walks Up from the inPath looking for a dir with the name dirTag

        inPath: the path to start in
        dirTag: the name of diretory above us we are looking for

    returns None if the directory named dirTag is not found
    '''
    import os
    path = os.path.abspath(__file__)
    while 1:
        # hmmm, will this break on unix paths?
        # what about case sensitivity?
        dirBasename = os.path.basename(os.path.normcase(path))
        if ( dirBasename ==  dirTag):
            break
        path, tail = os.path.split(path)
        if (len(tail)==0):
            return None
    return path
#--------------------------------------------------------------------------