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# -*- coding: utf-8 -*-
# Copyright 2015-2019 Mike Fährmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
"""Global configuration module"""
import sys
import json
import os.path
import logging
from . import util
log = logging.getLogger("config")
# --------------------------------------------------------------------
# internals
_config = {}
if os.name == "nt":
_default_configs = [
r"%USERPROFILE%\gallery-dl\config.json",
r"%USERPROFILE%\gallery-dl.conf",
]
else:
_default_configs = [
"/etc/gallery-dl.conf",
"${HOME}/.config/gallery-dl/config.json",
"${HOME}/.gallery-dl.conf",
]
# --------------------------------------------------------------------
# public interface
def load(files=None, strict=False, fmt="json"):
"""Load JSON configuration files"""
if fmt == "yaml":
try:
import yaml
parsefunc = yaml.safe_load
except ImportError:
log.error("Could not import 'yaml' module")
return
else:
parsefunc = json.load
for path in files or _default_configs:
path = util.expand_path(path)
try:
with open(path, encoding="utf-8") as file:
confdict = parsefunc(file)
except OSError as exc:
if strict:
log.error("%s", exc)
sys.exit(1)
except Exception as exc:
log.warning("Could not parse '%s': %s", path, exc)
if strict:
sys.exit(2)
else:
if not _config:
_config.update(confdict)
else:
util.combine_dict(_config, confdict)
def clear():
"""Reset configuration to an empty state"""
_config.clear()
def get(keys, default=None, conf=_config):
"""Get the value of property 'key' or a default value"""
try:
for k in keys:
conf = conf[k]
return conf
except (KeyError, AttributeError):
return default
def interpolate(keys, default=None, conf=_config):
"""Interpolate the value of 'key'"""
try:
lkey = keys[-1]
if lkey in conf:
return conf[lkey]
for k in keys:
if lkey in conf:
default = conf[lkey]
conf = conf[k]
return conf
except (KeyError, AttributeError):
return default
def set(keys, value, conf=_config):
"""Set the value of property 'key' for this session"""
for k in keys[:-1]:
try:
conf = conf[k]
except KeyError:
temp = {}
conf[k] = temp
conf = temp
conf[keys[-1]] = value
def setdefault(keys, value, conf=_config):
"""Set the value of property 'key' if it doesn't exist"""
for k in keys[:-1]:
try:
conf = conf[k]
except KeyError:
temp = {}
conf[k] = temp
conf = temp
return conf.setdefault(keys[-1], value)
def unset(keys, conf=_config):
"""Unset the value of property 'key'"""
try:
for k in keys[:-1]:
conf = conf[k]
del conf[keys[-1]]
except (KeyError, AttributeError):
pass
class apply():
"""Context Manager: apply a collection of key-value pairs"""
_sentinel = object()
def __init__(self, kvlist):
self.original = []
self.kvlist = kvlist
def __enter__(self):
for key, value in self.kvlist:
self.original.append((key, get(key, self._sentinel)))
set(key, value)
def __exit__(self, etype, value, traceback):
for key, value in self.original:
if value is self._sentinel:
unset(key)
else:
set(key, value)
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