command.rb

#!/usr/bin/env ruby

require 'thor'

class Command < Thor
  class Example < Thor
    ::Command.register(self, :example, 'example [COMMAND]', 'example namespace')

    class App < Thor
      Example.register(self, :app, 'app [COMMAND]', 'app namespace')

      desc :install, 'install something'
      def install
        puts 'run example app install'
      end
    end
  end
end

Command.start

gistfile1.txt

$ ./command.rb example app install
run example app install
$ ./command.rb help
Commands:
  command.rb app [COMMAND]      # app namespace
  command.rb example [COMMAND]  # example namespace
  command.rb example [COMMAND]  # example namespace
  command.rb help [COMMAND]  # Describe subcommands or one specific subcommand
  command.rb help [COMMAND]  # Describe available commands or one specific command
# ヘルプの表示がおかしいし実際 Command には example と help タスクしかない