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# Copyright (c) 2017-2019 David Steele <dsteele@gmail.com>
#
# SPDX-License-Identifier: GPL-2.0-or-later
# License-Filename: LICENSE
#
# Copyright 2016-2017 David Steele <steele@debian.org>
# This file is part of comitup
# Available under the terms of the GNU General Public License version 2
# or later
#
import os
import json
from functools import wraps
class persist(dict):
"""A JSON-file backed persistent dictionary"""
def __init__(self, path, *args, **kwargs):
"""Initialize with backing file path, and optional dict defaults"""
super(persist, self).__init__(*args, **kwargs)
self.__dict__['path'] = path
if os.path.exists(self.path):
self.load()
self.save()
def save(self):
with open(self.path, 'w') as fp:
json.dump(self, fp, indent=2)
def load(self):
with open(self.path, 'r') as fp:
dict = json.load(fp)
self.update(dict)
def addsave(fn):
@wraps(fn)
def wrapper(inst, *args, **kwargs):
# give wrapped function a chance to validate arguments
fn(inst, *args, **kwargs)
super_method = getattr(inst.__class__.__bases__[0], fn.__name__)
retval = super_method(inst, *args, **kwargs)
inst.save()
return retval
return wrapper
@addsave
def __setitem__(self, key, value, super_ret=None):
pass
@addsave
def update(self, *args, **kwargs):
pass
@addsave
def setdefault(self, *args, **kwargs):
pass
def __setattr__(self, name, value):
if name in self.__dict__:
self.__dict__[name] = value
else:
self.__setitem__(name, value)
def __getattr__(self, name):
if name in self.__dict__:
return self.__dict__[name]
else:
return self.__getitem__(name)
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