Make it possibe to have jade style mixins in slim http://jade-lang.com/reference/mixins/

applicaitnhelper.rb

  def mixin(name, &block)
    @mixins ||= {}
    @mixins[name] = block

    method = %{
      def #{name}(*args, &block)
        call_mixin(:#{name}, *args, &block)
      end    
    }
    eval(method)
  end

  def call_mixin(name, *args, &block)
    x = args || []
    x.unshift block
    capture *x, &@mixins[name]
  end

mixins.slim

  - mixin :list do |block, title|
    h1=title
    ul==capture(&block)

  = list "Ferrets" do 
    li Item Tobi
    li Item Loki

or use lambda

- hello = ->(*names) do
  - capture do
    .greet
      p= "Hello #{name}"

div.greetings
  = hello["John"]
  = hello["Steve"]