910 Bonus: Rake [0.75d]

Research

• What is rake good for?
• Take a look at some of the Rake tasks that Rails gives you (rake -T within a Rails project)
• Find the code that defines the rake stats task in the Rails gems
• What are some ways how a Rake task can execute another task?
• What does it mean if a Rake task "depends" on another task? E.g. understand what it means for a Rake task within a Rails app to depend on :environment.
• Understand that Capistrano tasks are also defined using the Rake DSL, but a Capistrano task is not automatically a Rake task and vice versa.

Exercises

• Write a Rake task rake list_app_files that lists all Ruby files and their file size within the app directory.
  • Hint: Use globbing to find those files (Dir.glob(File.join('root_directory', '**', '*.rb')))
  • Hint: You could use the number_to_human_size Show archive.org snapshot helper for better file size formatting
  • Hint: For better testability, write a service class with the functionality and only call it in your rake task
• Use a namespace to rename your task to rake app:list_files
• Give your task a nice description and notice how it appears in rake -T