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require 'yaml'
module Configurate; module Provider
# This provider tries to open a YAML file and does nested lookups
# in it.
class YAML < Base
# @param file [String] the path to the file
# @param opts [Hash]
# @option opts [String] :namespace optionally set this as the root
# @option opts [Boolean] :required wheter or not to raise an error if
# the file or the namespace, if given, is not found. Defaults to +true+.
# @raise [ArgumentError] if the namespace isn't found in the file
# @raise [Errno:ENOENT] if the file isn't found
def initialize(file, opts = {})
@settings = {}
required = opts.delete(:required) { true }
@settings = ::YAML.load_file(file)
namespace = opts.delete(:namespace)
unless namespace.nil?
@settings = lookup_in_hash(SettingPath.new(namespace), @settings) do
raise ArgumentError, "Namespace #{namespace} not found in #{file}" if required
$stderr.puts "WARNING: Namespace #{namespace} not found in #{file}"
end
end
rescue Errno::ENOENT => e
$stderr.puts "WARNING: Configuration file #{file} not found, ensure it's present"
raise e if required
end
def lookup_path(setting_path, *)
lookup_in_hash(setting_path, @settings)
end
private
def lookup_in_hash(setting_path, hash, &fallback)
fallback ||= proc { nil }
while hash.is_a?(Hash) && hash.has_key?(setting_path.first) && !setting_path.empty?
hash = hash[setting_path.shift]
end
return fallback.call unless setting_path.empty?
hash
end
end
end; end
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