example arg pasing in rake

Rakefile

desc 'shortcut to do:dev'
task :do => 'do:dev'

namespace :do do
  FileList["#{CONFIG_DIR}/*.json"].each do |f|
    target = File.basename(f, '.*')

    desc "do stuff for #{target}"
    task target do
      Rake::Task['do:stuff'].invoke(target)
    end
  end

  task :junk, :target do |t, args|
    puts "doing junk first"
    puts args.inspect
  end

  task :otherstuff, :target do |t, args|
    puts "doing otherstuff"
    puts args.inspect
  end

  task :stuff, [:target] => [:junk] do |t, args|
    target = args.target
    puts "doing stuff"
    puts args.inspect
    Rake::Task['do:otherstuff'].invoke(target)
  end
end