refactor_rule_example.rb

class ShorthandProcCallMacro < Refactor::Rule
  matches do |node|
    node in [:block, receiver,
      [[:arg, arg_name]], [:send, [:lvar, ^arg_name], method_name]
    ]
  end

  replace do |_node, match_data|
    "#{match_data[:receiver].source}(&:#{match_data[:method_name]})"
  end
end

# Should translate into something like:
class ShorthandProcCallMacro < Refactor::Rule
  def on_block(node)
    return false unless node in [:block, receiver,
      [[:arg, arg_name]], [:send, [:lvar, ^arg_name], method_name]
    ]
    
    rewrite("#{receiver.source}(&:#{method_name})")
  end
end