Rake output customization

Rakefile

# Rake output customization example
#
# Rake has two sources of output:
# * Rake::FileUtilsExt::rake_output_message
# * FileUtils::fu_output_message
#
# We can customize Rake output by monkey patching these methods.  This example
# monkey patches these methods to pass the message to our transform_message
# method then passing the output to the original output method.

def transform_message(*args)
  prefix = 'rake: '
  "\e[%dm%s%s\e[0m" % [1, prefix, args.join(' ')]
end

module Rake
  module FileUtilsExt
    alias :real_rake_output_message :rake_output_message
    def rake_output_message(*args, &block)
      real_rake_output_message(transform_message(*args), &block)
    end
  end
end

module FileUtils
  alias :real_fu_output_message :fu_output_message
  def fu_output_message(msg)
    real_fu_output_message transform_message(msg)
  end
end

task :default do
  touch 'file'
  sh 'echo hello world'
end