Creating methods with a macro based on the names of an enum

Question

Having a struct with the following enum:

struct Payment
  enum Status
    Open
    Paid
    Failed

    def to_s
      super.downcase
    end
  end

  getter status : String
end

How can I access the enum names in a macro to create methods like open?, paid? and failed??

SOLUTION

Based on @Jonne Haß' proposal, this is what I wanted to achieve:

{% for value in Status.constants %}
  {% downcased = value.stringify.downcase %}
  def {{ downcased.id }}?
    {{ downcased }} == status
  end
{% end %}

Answer 1

With TypeNode#constants:

struct Payment
  enum Status
    Open
    Paid
    Failed
  end

  getter status : Status = Status::Open

  {% begin %}
    delegate({{Status.constants.map {|value| value.stringify.downcase + "?" }.join(", ").id}}, to: status)
  {% end %}
end