Simple Rake task to use sed to strip trailing whitespace from Ruby source

rake_strip_whitespace.rb

desc "Remove trailing whitespace for source files"
task :strip_whitespace do
  files = %w[ .autotest .rspec .rvmrc Gemfile ]
  globs = %w[ lib/**/*.rb spec/**/*.rb ]
  files_from_globs = globs.map { |glob| Dir[glob] }
  files_to_strip = (files + files_from_globs).flatten

  system "sed -e 's/[ \t]*$//' -i '' #{files_to_strip.join(" ")}"
end