Dynaically Setup Rake Tasks

This is probably really old news. I just setup my first rake task tonight though so I thought I'd put it up here. This is more for myself really so if it's not your cup of tea turn away now.

I've been playing with rSpec's text stories in Merb but I couldn't find a way to make a rake task that would take an argument for a particular story to run. e.g.

rake story:run my_story

So I've done the next best thing. I scan my directory for story files and create the rake tasks dynamically. Now I can use:

rake story:run:my_story

As well as

rake story:run:all

The code to make this dream a reality is

# Allows all found stories to be run individually by using
# rake story:run:story_name
namespace :story do
  namespace :run do
    all_stories = []
    Dir.glob('stories/stories/**/*.rb').each do |path|
      story = path.split("/").last[0..-4]
      desc "Run spec story #{story}"
      task "#{story}".to_sym do
        sh %{ruby stories/stories/#{story}.rb}
      end
      all_stories << story
    end
    
    desc 'Run all stories'
    task :all do
      all_stories.each do |story|
        puts 
        sh %{ruby stories/stories/#{story}.rb}
      end
    end
  end
end