asciinema.org/Guardfile

guard 'rspec', :cli => '--fail-fast --tag ~js --tag ~slow' do
  watch(%r{^spec/.+_spec\.rb$})
  watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
  watch('spec/spec_helper.rb')  { "spec" }

  # Rails example
  watch(%r{^app/(.+)\.rb$})                           { |m| "spec/#{m[1]}_spec.rb" }
  watch(%r{^app/(.*)(\.erb|\.haml)$})                 { |m| "spec/#{m[1]}#{m[2]}_spec.rb" }
  watch(%r{^app/controllers/(.+)_(controller)\.rb$})  { |m| ["spec/routing/#{m[1]}_routing_spec.rb", "spec/#{m[2]}s/#{m[1]}_#{m[2]}_spec.rb", "spec/acceptance/#{m[1]}_spec.rb"] }
  watch(%r{^spec/support/(.+)\.rb$})                  { "spec" }
  watch('config/routes.rb')                           { "spec/routing" }
  watch('app/controllers/application_controller.rb')  { "spec/controllers" }

  # Capybara features specs
  watch(%r{^app/views/(.+)/.*\.(erb|haml)$})          { |m| "spec/requests/#{m[1]}_spec.rb" }
  watch(%r{^app/controllers/(.+)_(controller)\.rb$})  { |m| "spec/features/#{m[1]}/*_spec.rb" }
  watch(%r{^spec/features/(.+)\.rb$})

  # Turnip features and steps
  watch(%r{^spec/acceptance/(.+)\.feature$})
  watch(%r{^spec/acceptance/steps/(.+)_steps\.rb$})   { |m| Dir[File.join("**/#{m[1]}.feature")][0] || 'spec/acceptance' }
end

group 'javascript' do
  js_spec_location = "spec/javascripts/%s_spec"

  guard 'jasmine-headless-webkit' do
    watch(%r{^app/views/.*\.jst$})
    watch(%r{^public/javascripts/(.*)\.js$}) { |m| newest_js_file(js_spec_location % m[1]) }
    watch(%r{^app/assets/javascripts/(.*)\.(js|coffee)$}) { |m| newest_js_file(js_spec_location % m[1]) }
    watch(%r{^spec/javascripts/(.*)_spec\..*}) { |m| newest_js_file(js_spec_location % m[1]) }
  end
end