RakeFile.rb

require 'rake'

task :create do
  p 'created'
end

task :create_all do
  Rake::Task['create'].invoke
end


task :create_by, :tool do |task, args|
  p "created by #{args[:tool]}"
end

task :create_by_select do
  Rake::Task['create_by'].invoke("paper") # 引数が順位渡る
end

task :create_by_all do
  [:knife, :pen].each do |tool|
    # executeの引数そのものがargs
    # Invoke the task if it is needed. Prerequites are invoked first.
    Rake::Task['create_by'].execute(:tool => tool)
  end 
end


namespace :hitech do
  task :create_by, :tool do |task, args|
    p "created by #{args[:tool]}"
  end

  task :create_by_all do
    [:pc, :arduino].each do |tool|
      Rake::Task['hitech:create_by'].execute(:tool => tool)
    end 
  end

end