command.cr

module DockerProjectManager
  abstract class Command
    def self.commands : Hash(String, self.class)
      @@commands ||= Hash(String, self.class).new
    end

    macro inherited
      command_class = {{ @type.name.id }}
      command_name = "{{ @type.name.id }}".split("::").last.downcase
      self.commands[command_name] = command_class
    end
  end
end

class DockerProjectManager::Bootstrap < DockerProjectManager::Command end

log

Error in x.cr:15: expanding macro

class DockerProjectManager::Bootstrap < DockerProjectManager::Command end
^

in macro 'inherited' /root/docker-project-manager/x.cr:7, line 3:

   1.       command_class = DockerProjectManager::Bootstrap
   2.       command_name = "DockerProjectManager::Bootstrap".split("::").last.downcase
>  3.       self.commands[command_name] = command_class
   4.     

instantiating 'DockerProjectManager::Bootstrap.class#commands()'
in x.cr:3: type must be Hash(String, DockerProjectManager::Bootstrap.class), not (Hash(String, DockerProjectManager::Bootstrap.class) | Hash(String, DockerProjectManager::Command.class))

    def self.commands : Hash(String, self.class)
             ^~~~~~~~

Rerun with --error-trace to show a complete error trace.