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# -*- coding: utf-8 -*-
# Copyright 2014 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import argparse
import sys
import os
import yaml
class ConfigError(Exception):
pass
class Config(object):
def __init__(self, args):
pass
@staticmethod
def abspath(file_path):
return os.path.abspath(file_path) if file_path else file_path
@classmethod
def check_file(cls, file_path, config_name):
if file_path is None:
raise ConfigError(
"Missing config for %s."
" Try running again with --generate-config"
% (config_name,)
)
if not os.path.exists(file_path):
raise ConfigError(
"File % config for %s doesn't exist."
" Try running again with --generate-config"
% (config_name,)
)
return cls.abspath(file_path)
@classmethod
def read_file(cls, file_path, config_name):
cls.check_file(file_path, config_name)
with open(file_path) as file_stream:
return file_stream.read()
@staticmethod
def read_config_file(file_path):
with open(file_path) as file_stream:
return yaml.load(file_stream)
@classmethod
def add_arguments(cls, parser):
pass
@classmethod
def generate_config(cls, args, config_dir_path):
pass
@classmethod
def load_config(cls, description, argv, generate_section=None):
config_parser = argparse.ArgumentParser(add_help=False)
config_parser.add_argument(
"-c", "--config-path",
metavar="CONFIG_FILE",
help="Specify config file"
)
config_parser.add_argument(
"--generate-config",
action="store_true",
help="Generate config file"
)
config_args, remaining_args = config_parser.parse_known_args(argv)
if config_args.generate_config:
if not config_args.config_path:
config_parser.error(
"Must specify where to generate the config file"
)
config_dir_path = os.path.dirname(config_args.config_path)
if os.path.exists(config_args.config_path):
defaults = cls.read_config_file(config_args.config_path)
else:
defaults = {}
else:
if config_args.config_path:
defaults = cls.read_config_file(config_args.config_path)
else:
defaults = {}
parser = argparse.ArgumentParser(
parents=[config_parser],
description=description,
formatter_class=argparse.RawDescriptionHelpFormatter,
)
cls.add_arguments(parser)
parser.set_defaults(**defaults)
args = parser.parse_args(remaining_args)
if config_args.generate_config:
config_dir_path = os.path.dirname(config_args.config_path)
config_dir_path = os.path.abspath(config_dir_path)
if not os.path.exists(config_dir_path):
os.makedirs(config_dir_path)
cls.generate_config(args, config_dir_path)
config = {}
for key, value in vars(args).items():
if (key not in set(["config_path", "generate_config"])
and value is not None):
config[key] = value
with open(config_args.config_path, "w") as config_file:
yaml.dump(config, config_file, default_flow_style=False)
sys.exit(0)
return cls(args)
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