#!/usr/bin/env python
# CCS Computer Science
#   Layout
#
# Douglas Thrift
#
# $Id$

import admin
import common
import os

if __name__ == '__main__':
	parser = admin.parser(description = 'List CCS CS Lab shell layout')

	parser.add_option('-v', '--verbose', action = 'store_true', help = 'show information about what shell paths were found')

	verbose = parser.parse_args()[0].verbose
	path = os.environ['PATH'].split(os.pathsep)
	_shells = map(lambda shell: shell[0], common.SHELLS[:-1])
	shells = []

	if verbose:
		format = '%%%us: %%s' % ((len(max(_shells, key = len)) + 1) / 2 * 2)

	for shell in _shells:
		found = False

		for directory in path:
			_shell = os.path.join(directory, shell)

			if os.path.exists(_shell) and os.access(_shell, os.R_OK | os.X_OK):
				shells.append(_shell)

				if verbose:
					print format % (shell, _shell)

				found = True

				break

		if not found:
			admin.error('Shell not found: %s.' % shell)

	for system in common.SYSTEMS:
		if shells == map(lambda shell: shell[1][system], common.SHELLS[:-1]):
			print system

			parser.exit()
	
	admin.error('Unknown shell layout.')

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