Example Guardfile for Ruby on Rails Applications with the front end inside of Rails

Guardfile

clearing :on

directories %w(app lib config spec) \
 .select{|d| Dir.exists?(d) ? d : UI.warning("Directory #{d} does not exist")}

group :cops do
 guard 'rake', task: 'myapp:test:rubocop' do
   watch(%r{(app|lib|spec)/(.+)\.(rb|rake)$})
   watch(%r{config/(application|routes).rb})
 end
end

group :testing do
  guard :rspec, cmd: 'bin/rspec' do
    require 'guard/rspec/dsl'
    dsl = Guard::RSpec::Dsl.new(self)

    # RSpec files
    rspec = dsl.rspec
    watch(rspec.spec_helper) { rspec.spec_dir }
    watch(rspec.spec_support) { rspec.spec_dir }
    watch(rspec.spec_files)

    # Ruby files
    ruby = dsl.ruby
    dsl.watch_spec_files_for(ruby.lib_files)

    # Rails files
    rails = dsl.rails(view_extensions: %w(erb haml slim))
    dsl.watch_spec_files_for(rails.app_files)
    dsl.watch_spec_files_for(rails.views)

    watch(rails.controllers) do |m|
      [
        rspec.spec.("routing/#{m[1]}_routing"),
        rspec.spec.("controllers/#{m[1]}_controller"),
        rspec.spec.("acceptance/#{m[1]}")
      ]
    end

    # Monitor Factories
    watch(%r{^spec/factories/(.+)\.rb$}) { 'spec/models' }

    # Rails config changes
    watch(rails.spec_helper)     { rspec.spec_dir }
    watch(rails.routes)          { "#{rspec.spec_dir}/routing" }
    watch(rails.app_controller)  { "#{rspec.spec_dir}/controllers" }

    # Capybara features specs
    watch(rails.view_dirs)     { |m| rspec.spec.("features/#{m[1]}") }
    watch(rails.layouts)       { |m| rspec.spec.("features/#{m[1]}") }

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