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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Copyright:: Copyright (c) 2008 OpsCode, Inc.
# License:: Apache License, Version 2.0
#
# 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.
#
require 'ohai/mixin/from_file'
# Ohai::Config[:variable]
# @config = Ohai::Config.new()
# Ohai::Config.from_file(foo)
# Ohai::Config[:cookbook_path]
# Ohai::Config.cookbook_path
# Ohai::Config.cookbook_path "one", "two"
module Ohai
class Config
@configuration = {
:log_level => :info,
:log_location => STDOUT,
:plugin_path => [ File.expand_path(File.join(File.dirname(__FILE__), 'plugins')) ]
}
class << self
include Ohai::Mixin::FromFile
# Pass Ohai::Config.configure() a block, and it will yield @configuration.
#
# === Parameters
# <block>:: A block that takes @configure as it's argument
def configure(&block)
yield @configuration
end
# Get the value of a configuration option
#
# === Parameters
# config_option<Symbol>:: The configuration option to return
#
# === Returns
# value:: The value of the configuration option
#
# === Raises
# <ArgumentError>:: If the configuration option does not exist
def [](config_option)
if @configuration.has_key?(config_option.to_sym)
@configuration[config_option.to_sym]
else
raise ArgumentError, "Cannot find configuration option #{config_option.to_s}"
end
end
# Set the value of a configuration option
#
# === Parameters
# config_option<Symbol>:: The configuration option to set (within the [])
# value:: The value for the configuration option
#
# === Returns
# value:: The new value of the configuration option
def []=(config_option, value)
@configuration[config_option.to_sym] = value
end
# Check if Ohai::Config has a configuration option.
#
# === Parameters
# key<Symbol>:: The configuration option to check for
#
# === Returns
# <True>:: If the configuration option exists
# <False>:: If the configuration option does not exist
def has_key?(key)
@configuration.has_key?(key.to_sym)
end
# Allows for simple lookups and setting of configuration options via method calls
# on Ohai::Config. If there any arguments to the method, they are used to set
# the value of the configuration option. Otherwise, it's a simple get operation.
#
# === Parameters
# method_symbol<Symbol>:: The method called. Must match a configuration option.
# *args:: Any arguments passed to the method
#
# === Returns
# value:: The value of the configuration option.
#
# === Raises
# <ArgumentError>:: If the method_symbol does not match a configuration option.
def method_missing(method_symbol, *args)
if @configuration.has_key?(method_symbol)
if args.length == 1
@configuration[method_symbol] = args[0]
elsif args.length > 1
@configuration[method_symbol] = args
end
return @configuration[method_symbol]
else
raise ArgumentError, "Cannot find configuration option #{method_symbol.to_s}"
end
end
end # class << self
end
end
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