"""
"""

import sys, os, re
import distutils.sysconfig
if sys.platform == 'win32':
   try:
       import subprocess
   except:
        sys.exit( '' )

svnBranch='trunk'


def findCipresSource( branchToCheckout='trunk' ):
    cipresTop = None
    hadCIPRES = os.path.exists( 'cipres' )
    if hadCIPRES:
        cipresTop = 'cipres'
    else:
        cipresTop = findHighestVersionedDir( 'cipres' )
    return cipresTop    

def findHighestVersionedDir( prefix ):
    '''Looks for prefix-#.#.# pattern in current directory using the regex ^prefix-?[0-9.]*$
    Returns the directory with the highest version numer (or None if there are no matches)'''
    dirTuples = findAllVersionedDir( prefix )
    if not dirTuples:
        return None
    currHighest = dirTuples[0]
    for d in dirTuples[1:]:
        if versionTupleCmp( currHighest[1], d[1] ) < 0:
            currHighest = d
    return currHighest[0]

def findAllVersionedDir( prefix ):
    '''Looks for prefix-#.#.# pattern in current directory using the regex ^prefix-?[0-9.]*$
    Returns list tuples:
        [(dir-name, tuple of version numbers), ]
    of all version-numbered directories found.'''
    p = re.compile( '^%s' % prefix + r'-([0-9.]+)$' )
    children = os.listdir( os.path.curdir )
    matches = []
    for c in children:
        m = p.match( c )
        if m:
            matches.append( ( c, m.group( 1 ).split( '.' ) ) )
    return matches

def versionTupleCmp( f, s ):
    """__cmp__ function for version tuples.
    cannot use lexigraphic cmp because:
        1.1 < 1.04
    can't convert the whole thing to a decimal because
        1.10 > 1.1.11"""
    if len( f ) == 0:
        return len( s ) != 0 and -1 or 0
    for ind, v in enumerate( f ):
        if ind+1 > len( s ):
            return 1
        r = cmp( v, s[ind] )
        if r != 0:
            return r
    if len( s ) > len( f ):
        return -1
    return 0

if __name__ == '__main__':
    cipresTop = findCipresSource( svnBranch )
    if cipresTop:
        print cipresTop