config.py
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	#!/usr/bin/env python3
	# -- coding: utf-8 --
	import getpass
	from os.path import isfile, isdir, exists
	import re

	KNORA_BASE = 'http://www.knora.org/ontology/knora-base#'

	PROJECT_NAME = 'tln'
	PROJECT_URL = 'http://www.knora.org/ontology/0068/nietzsche'

	ONTOLOGY_DIR = './ontologies' if getpass.getuser() == 'knister0' else './ontologies' # local onotology dir, script will read only
	SHARED_ONTOLOGIES_DIR = '{}/Ontologies-shared'.format(ONTOLOGY_DIR)
	PROJECT_ONTOLOGY_FILE = '{}/project-ontologies/nietzsche-ontology.ttl'.format(ONTOLOGY_DIR)

	DATATYPES_DIR = './svgscripts/datatypes' # optional in config file, can be overwritten by passing a <dir> to py2ttl/py2ttl.py

	def check_config_files_exist():
	"""Checks whether all files exist that are specified in this file by uppercase variables ending in 'DIR' or 'FILE'.

	:return: exit code (int)
	"""
	for key in [ key for key in globals().keys() if re.match(r'^[A-Z_-]+(DIR\|FILE)$', key) ]:
	if not exists(globals().get(key)):
	raise FileNotFoundError('Key {} does not specify an existing file or directory'.format(key))
	if key.endswith('DIR') and not isdir(globals().get(key)):
	raise NotADirectoryError('Key {} does not specify an existing directory'.format(key))
	return 0

	def get_datatypes_dir():
	"""Returns value of DATATYPES_DIR if set, else None.
	"""
	if 'DATATYPES_DIR' in globals().keys():
	return DATATYPES_DIR.replace('./','')
	else:
	None