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# Copyright (C) 2015-2019 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Python library for lorry-controller yarns.
import os
import json
DATADIR = os.environ['DATADIR']
def matches():
'''Returns a generator of MATCH_n environment variables.'''
matches = {}
prefix = "MATCH_"
for key, value in os.environ.items():
if key.startswith(prefix):
stripped_key = key[len(prefix):]
if stripped_key.isdigit() and stripped_key != "0":
matches[int(stripped_key)] = value
for key in sorted(matches):
if key != 1 and key-1 not in matches:
break
yield matches[key]
def load_json_from_file(filename):
'''Deserialise json file.'''
with open(filename, "r") as f:
return json.load(f)
def dump_json_to_file(j, filename):
'''Write serialised object to file.'''
with open(filename, "w") as f:
return json.dump(j, f, indent=4)
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