ViewComonent helper using DSL flavor.

view_component_helper.rb

# usage:
# = render vc.path1.path2(:name, arg1: 'a')
# or
# = render vc('path1/path2/name', arg1: 'a')

module ViewComponentHelper
  class VisualComponentChainer

    def initialize
      @nest = []
    end

    def __view_component__(name, *args)
      name_with_package = (@nest + [name]).join('/')
      component_klass = "#{name_with_package}_component".classify.constantize
      params = args.extract_options!
      if args.size == 0
        component_klass.new **params
      elsif args.size == 1 && args[0].is_a?(Enumerable)
        component_klass.with_collection args[0], **params
      else
        raise "Unacceptable input: args.size=#{args.size}, args=#{args}, params=#{params}"
      end
    end

    def method_missing(symbol, *args)
      if symbol.to_s =~ /^[a-z][a-z\d_]+$/
        self.class.class_eval do
          define_method symbol do |*params|
            @nest << symbol
            if params.size == 0
              self
            else
              name = params.shift
              __view_component__(name, *params)
            end
          end
        end
        __send__(symbol, *args)
      else
        super
      end
    end
  end

  def vc(*args)
    vcc = VisualComponentChainer.new
    if args.size == 0
      vcc
    else
      name = args.shift
      vcc.__view_component__(name, *args)
    end
  end
end