Idea: Writing Tailwind CSS with ruby's method chain.

example.slim

body(class=tw.text.px_4.py_2.hover__text_gray_200)
  button(class=tw.btn.btn_primary) CLICK!

tailwind_styles.rb

class TailwindStyles
  def text
    'dark:text-white text-black'
  end
  def btn
    'p-4 rounded-full inline'
  end
  def btn_primary
    'text-white dark:bg-blue-800'
  end
end

tailwindcss_helper.rb

module TailwindcssHelper
  class TailwindStylesChainable
    def initialize
      @classes = []
      @tailwind_styles = TailwindStyles.new
    end
    attr_reader :classes

    def to_s
      classes.join(' ')
    end

    def method_missing(symbol, *args)
      if @tailwind_styles.respond_to?(symbol)
        self.class.class_eval do
          define_method symbol do |*args|
            @classes << @tailwind_styles.send(symbol, *args)
            self
          end
        end
        __send__(symbol, *args)
      elsif symbol.to_s =~ /^[a-z][a-z\d_]+$/
        self.class.class_eval do
          k = symbol.to_s.gsub('__', ':').gsub('_', '-')
          define_method symbol do
            @classes << k
            self
          end
        end
        __send__(symbol, *args)
      else
        super
      end
    end
  end

  def tw
    TailwindStylesChainable.new
  end
end