#
#  Name:    MpBuildPyc.pyx
#
#  Purpose: This module is used to help create .pyc compiled bytecode files
#           from the .py source code.
#
#           The primary thing this script does is make sure that the
#           directory containing the libMx shared C library is included
#           in the shared library path.  This is LD_LIBRARY_PATH on
#           many platforms.
#
#           It turns out that Python ignores any changes to LD_LIBRARY_PATH
#           that are made after the interpreter starts up.  That means that
#           we cannot modify LD_LIBRARY_PATH and then do an import using
#           the modified path using a single process.  In order to get the
#           effect we want, it is necessary to change LD_LIBRARY_PATH in
#           one process and then invoke a second process which will inherit
#           the modified LD_LIBRARY_PATH.
#
#           Note: This script has the extension .pyx so that 'make install'
#           will not copy it to the installation directory.
#
#  Author:  William Lavender
#
#-----------------------------------------------------------------------
#
#  Copyright 2002, 2009 Illinois Institute of Technology
#
#  See the file "LICENSE" for information on usage and redistribution
#  of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#

import os, sys

### Get the module name from argv. ###

module_name = sys.argv[1]

### Find the MX installation directory. ###

try:
	mxdir = os.environ["MXDIR"]
except:
	if ( sys.platform == "win32" ):
		mxdir = "c:\\opt\\mx"
	else:
		mxdir = "/opt/mx"

### Find the default shared library path. ###

if ( sys.platform == "win32" ):
	path_name = "PATH"
elif ( sys.platform == "darwin" ):
	path_name = "DYLD_LIBRARY_PATH"
else:
	path_name = "LD_LIBRARY_PATH"

try:
	library_path = os.environ[path_name]
except:
	library_path = ""

### Add the directories most likely to contain libMx and libMp to the path. ###

if ( sys.platform == "win32" ):
	dirlist = [ "..\\..\\mp\\libMp", "..\\..\\mx\libMx", mxdir + "\\lib", "." ]
else:
	dirlist = [ "../../mp/libMp", "../../mx/libMx", mxdir + "/lib", "." ]

for dir in dirlist:

	dir = os.path.normpath( dir )

	library_path = dir + os.pathsep + library_path

### Replace the shared library search path. ###

os.environ[path_name] = library_path

### Build the .pyc file using the modified shared library search path. ###

command = '%s -c "import %s"' % ( sys.executable, module_name )

os.system( command )