class Middleman::ConfigContext

def helpers(*helper_modules, &block)
  helper_modules ||= []
  if block_given?
    block_module = Module.new
    block_module.module_eval(&block)
    helper_modules << block_module
  end
  helper_modules.each do |mod|
    @template_context_class.send :include, mod
  end
end

def include(mod)
  extend(mod)
end

def include_environment(name)
  path = File.dirname(__FILE__)
  other_config = File.join(path, name.to_s)
  return unless File.exist? other_config
  instance_eval File.read(other_config), other_config, 1
end

def initialize(app, template_context_class)
  @app = app
  @template_context_class = template_context_class
  @callbacks = ::Middleman::CallbackManager.new
  @callbacks.install_methods!(self, [:before_build, :after_build, :configure, :after_configuration, :ready])
  # Trigger internal callbacks when app level are executed.
  app.subscribe_to_callbacks(&method(:execute_callbacks))
end

def mime_type(type, value)
  type = ".#{type}" unless type.to_s[0] == '.'
  ::Rack::Mime::MIME_TYPES[type] = value
end

def set(key, default=nil, &block)
  config.define_setting(key, default) unless config.defines_setting?(key)
  @app.config[key] = block_given? ? block : default
end