Monkey-patch Rake::Task to show all task invocations

rake-task-monkey-patch.rb

# In your Rakefile (after Rails.application.load_tasks, in a Rails project):

module TaskExtensions
  def invoke
    (@logger ||= Logger.new($stderr)).tap do |logger|
      logger.info("invoke #{self.name}") # note: you can also dump environment variables etc. here
    end
    super
  end
end

module Rake
  class Task
    prepend TaskExtensions
  end
end