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require 'nenv/environment/dumper'
require 'nenv/environment/loader'
module Nenv
class Environment
class Error < ArgumentError
end
class MethodError < Error
def initialize(meth)
@meth = meth
end
end
class AlreadyExistsError < MethodError
def message
format('Method %s already exists', @meth.inspect)
end
end
def initialize(namespace = nil)
@namespace = (namespace ? namespace.upcase : nil)
end
def create_method(meth, &block)
self.class._create_env_accessor(singleton_class, meth, &block)
end
private
def _sanitize(meth)
meth.to_s[/^([^=?]*)[=?]?$/, 1].upcase
end
def _namespaced_sanitize(meth)
[@namespace, _sanitize(meth)].compact.join('_')
end
class << self
def create_method(meth, &block)
_create_env_accessor(self, meth, &block)
end
def _create_env_accessor(klass, meth, &block)
_fail_if_accessor_exists(klass, meth)
if meth.to_s.end_with? '='
_create_env_writer(klass, meth, &block)
else
_create_env_reader(klass, meth, &block)
end
end
private
def _create_env_writer(klass, meth, &block)
env_name = nil
dumper = nil
klass.send(:define_method, meth) do |raw_value|
env_name ||= _namespaced_sanitize(meth)
dumper ||= Dumper.setup(&block)
ENV[env_name] = dumper.(raw_value)
end
end
def _create_env_reader(klass, meth, &block)
env_name = nil
loader = nil
klass.send(:define_method, meth) do
env_name ||= _namespaced_sanitize(meth)
loader ||= Loader.setup(meth, &block)
loader.(ENV[env_name])
end
end
def _fail_if_accessor_exists(klass, meth)
fail(AlreadyExistsError, meth) if klass.method_defined?(meth)
end
end
end
end
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