#! /usr/bin/env python
"""This file holds some mundane code that CIPRES-dependent modules 
may want to copy or import.
Currently it tries to import from PIPRes.verify_import and issues a 
    helpful message about how to set the PYTHONPATH if the import fails.
"""
try:
    import PIPRes.verify_import
except ImportError, _x:
    import sys, os
    if 'CIPRES_ROOT' in os.environ:
        _msg = "Make sure that CIPRES_ROOT is set correctly.  " \
              "$CIPRES_ROOT should contain a "\
              "lib/python/site-packages directory!\n"
        try:
            _p = os.path.join('$CIPRES_ROOT', 'lib', 'python', 'site-packages')
            pipresParent = os.path.expandvars(_p)
            if not os.path.exists(pipresParent):
                sys.exit(str(_x) + _msg)
            sys.path.append(pipresParent)
            import PIPRes.verify_import
            del _msg
            del _x
        except ImportError, _y:
            sys.exit(str(_y) + _msg)    
    else:
        _msg = "%s\nMake sure that CIPRES_ROOT and PYTHONPATH variables "\
               "and set correctly.\n"\
               "You will have to add:\n"\
               "     $CIPRES_ROOT/lib/python/site-packages\n" \
               "to your PYTHONPATH environment and their maybe" % str(_x)
        sys.exit(_msg)