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