macros.cr

# Here is what I have now
def self.create{% if with_bang %}!{% end %}(
  {% if with_params %}params,{% end %}
  {% for type_declaration in (NEEDS_ON_CREATE + NEEDS_ON_INITIALIZE) %}
    {{ type_declaration }},
  {% end %}
  {% if @type.constant :FIELDS %}
    {% for field in FIELDS %}
      {{ field[:name] }} : {{ field[:type] }} | Nothing{% if field[:nilable] %} | Nil{% end %} = Nothing.new,
    {% end %}
  {% end %}
  {% for field in VIRTUAL_FIELDS %}
    {{ field.var }} : {{ field.type }} | Nothing = Nothing.new,
  {% end %}
)
  
# Here's what I'd *love* to do
def self.create{% if with_bang %}!{% end %}(
  {% if with_params %}params,{% end %}
  {{ args_for_needs() }}
  {{ args_for_fields() }}
  {{ args_for_virtual_fields() }}
  # Or maybe a method like this
  {{ run_macro args_for_fields() }}
)

macro args_for_needs
  {% for type_declaration in (NEEDS_ON_CREATE + NEEDS_ON_INITIALIZE) %}
    {{ type_declaration }},
  {% end %}
end

macro args_for_fields
  {% if @type.constant :FIELDS %}
    {% for field in FIELDS %}
      {{ field[:name] }} : {{ field[:type] }} | Nothing{% if field[:nilable] %} | Nil{% end %} = Nothing.new,
    {% end %}
  {% end %}
end

macro args_for_virtual_fields
  {% for field in VIRTUAL_FIELDS %}
    {{ field.var }} : {{ field.type }} | Nothing = Nothing.new,
  {% end %}
end