#! /usr/bin/env python
#
#  Name:    mpscript
#
#  Purpose: This script initializes Mp, loads an MX database, and then runs
#           a user specified script.
#
#  Author:  William Lavender
#
#---------------------------------------------------------------------------
#
#  Copyright 2002, 2006, 2008 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 sys, os, traceback

if ( len(sys.argv) <= 1 ):
	print ""
	print "Usage: %s script_filename script_arg1 script_arg2 ..." \
							% ( sys.argv[0] )
	print ""
	sys.exit(1)

sys.stdout = sys.stderr

#  Figure out where the MX installation directory is.

try:
	mxdir = os.environ["MXDIR"]
except:
	mxdir = "/opt/mx"	# This is the default location.

#  Are we using an installed version of Mp or a test version of Mp?

try:
	test = os.environ["MXTEST"]

	test = int(test)

	if ( test == 1 ):
		use_test_version = 1
	else:
		use_test_version = 0
except:
	use_test_version = 0

#  Construct the name of the Mp modules directory.

if ( use_test_version ):
	mp_modules_dir = os.getcwd()

	mp_modules_dir = os.path.join( mp_modules_dir, "..", "libMp" )

	mp_modules_dir = os.path.normpath( mp_modules_dir )
else:
	mp_modules_dir = os.path.join( mxdir, "lib", "mp" )

	mp_modules_dir = os.path.normpath( mp_modules_dir )

#  Does the Mp modules directory exist?

if ( os.path.isdir( mp_modules_dir ) == 0 ):
	error_message = \
		"The Mp modules directory '%s' does not exist.  Aborting..." \
		% ( mp_modules_dir )

	raise ValueError, error_message
	sys.exit(1)

#  Add the Mp modules directory to the Python module load path.

sys.path[:0] = [ mp_modules_dir ]

#  Import the Mp module.

import Mp

#  Get the name of the requested script file.

script_filename = sys.argv[1]

Mp.__program_name__ = script_filename

#  Try to execute the script file.

try:
	execfile( script_filename )
except:
	print ""
	print "%s: Cannot execute the script '%s'." \
				% ( sys.argv[0], script_filename )
	traceback.print_exc()
	print ""
	sys.exit(1)

#  Figure out which MX database to use.

try:
	# First try to get the name from an environment variable.

	database_filename = os.environ["MXDATABASE"]
except:
	# If the environment variable does not exist, construct
	# the filename for the default MX database.

	database_filename = os.path.join( mxdir, "etc", "motor.dat" )

	database_filename = os.path.normpath( database_filename )

#  Attempt to start up the MX database.

try:
	record_list = Mp.setup_database( database_filename )
except:
	print ""
	print "%s: Error setting up MX database file '%s'." \
				% ( sys.argv[0], database_filename )
	print ""
	sys.exit(1)

#  Set the plot enable flag to 'nowait'.

record_list.set_plot_enable(2)

#  Invoke the main() procedure in the script file.

main( record_list, sys.argv[2:] )