Meta rake file that collects tasks in other rake files

Rakefile

require "rubygems"
require "rake"

Rake::TaskManager.record_task_metadata = true

puts "Begin loading tasks"
# Import rake scripts from the following directories:
[
  'build',
  'deploy'
].each do |dir|
  Dir.glob("#{dir}/*.rake").each do |file|
    puts "Loading #{file}"
    import file
  end
end
puts "Done loading tasks"
puts

# Require user to specify an action before doing anything
desc "Show usage info by default"
task :default => [:usage]

desc "Show overview of available tasks"
task :usage do
  # Using heredocs, excuse the weird formatting

  # Overview info
  puts <<INTRO
Rake development tasks
Usage: rake <task> <options>

INTRO

  # List and describe all available tasks
  puts <<TASKS
Available tasks:
====================
TASKS

  Rake.application.tasks.each do |task|
    puts "#{task.name} - #{task.comment}"
  end

end