Initial yardoc for the DSL class.
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Michael Kessler
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commit
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268
lib/guard/dsl.rb
268
lib/guard/dsl.rb
@ -1,62 +1,158 @@
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module Guard
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# The DSL class provides the methods that are used in each `Guardfile` to describe
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# the behaviour of Guard.
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#
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# The main keywords of the DSL are `guard` and `watch`, which are necessary to define
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# which Guards are used a what file changes they are watching.
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#
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# Optionally you can group the Guards with the `group` keyword and ignore certain paths
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# with the `ignore_paths` keyword.
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#
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# A more advanced DSL use is the `callback` keyword, that allows you to execute arbitrary
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# code before or after any of the `start`, `stop`, `reload`, `run_all` and `run_on_change`
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# guards' method. You can even insert more hooks inside these methods.
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# Please [checkout the Wiki page](https://github.com/guard/guard/wiki/Hooks-and-callbacks) for more details.
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#
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# The DSL will also evaluate normal Ruby code.
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#
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# There are two possible locations for the `Guardfile`:
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# - The `Guardfile` in the current directory where Guard has been started
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# - The `.Guardfile` in your home directory.
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#
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# In addition, if a user configuration `.guard.rb` in your home directory is found, it will
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# be appended to the current project `Guardfile`.
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#
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# @example A sample of a complex Guardfile
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# group 'frontend' do
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# guard 'passenger', :ping => true do
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# watch('config/application.rb')
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# watch('config/environment.rb')
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# watch(%r{^config/environments/.+\.rb})
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# watch(%r{^config/initializers/.+\.rb})
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# end
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#
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# guard 'livereload', :apply_js_live => false do
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# watch(%r{^app/.+\.(erb|haml)})
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# watch(%r{^app/helpers/.+\.rb})
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# watch(%r{^public/javascripts/.+\.js})
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# watch(%r{^public/stylesheets/.+\.css})
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# watch(%r{^public/.+\.html})
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# watch(%r{^config/locales/.+\.yml})
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# end
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# end
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#
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# group 'backend' do
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# # Reload the bundle when the Gemfile is modified
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# guard 'bundler' do
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# watch('Gemfile')
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# end
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#
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# # for big project you can fine tune the "timeout" before Spork's launch is considered failed
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# guard 'spork', :wait => 40 do
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# watch('Gemfile')
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# watch('config/application.rb')
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# watch('config/environment.rb')
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# watch(%r{^config/environments/.+\.rb})
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# watch(%r{^config/initializers/.+\.rb})
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# watch('spec/spec_helper.rb')
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# end
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#
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# # use RSpec 2, from the system's gem and with some direct RSpec CLI options
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# guard 'rspec', :version => 2, :cli => "--color --drb -f doc", :bundler => false do
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# watch('spec/spec_helper.rb') { "spec" }
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# watch('app/controllers/application_controller.rb') { "spec/controllers" }
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# watch('config/routes.rb') { "spec/routing" }
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# watch(%r{^spec/support/(controllers|acceptance)_helpers\.rb}) { |m| "spec/#{m[1]}" }
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# watch(%r{^spec/.+_spec\.rb})
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#
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# 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"] }
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#
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# watch(%r{^app/(.+)\.rb}) { |m| "spec/#{m[1]}_spec.rb" }
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# watch(%r{^lib/(.+)\.rb}) { |m| "spec/lib/#{m[1]}_spec.rb" }
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# end
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# end
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#
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class Dsl
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class << self
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@@options = nil
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def evaluate_guardfile(options = {})
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options.is_a?(Hash) or raise ArgumentError.new("evaluate_guardfile not passed a Hash!")
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# Evaluate the DSL methods in the `Guardfile`.
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#
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# @param [Hash] options the Guard options
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# @raise [ArgumentError] when options are not a Hash
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#
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def evaluate_guardfile(options = { })
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raise ArgumentError.new('No option hash passed to evaluate_guardfile!') unless options.is_a?(Hash)
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@@options = options.dup
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fetch_guardfile_contents
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instance_eval_guardfile(guardfile_contents_with_user_config)
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UI.error "No guards found in Guardfile, please add at least one." if !::Guard.guards.nil? && ::Guard.guards.empty?
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UI.error 'No guards found in Guardfile, please add at least one.' if !::Guard.guards.nil? && ::Guard.guards.empty?
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end
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# Reevaluate the Guardfile to update the current Guard configuration
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# when the `Guardfile` has been changed after Guard is started.
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#
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def reevaluate_guardfile
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::Guard.guards.clear
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@@options.delete(:guardfile_contents)
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Dsl.evaluate_guardfile(@@options)
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msg = "Guardfile has been re-evaluated."
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msg = 'Guardfile has been re-evaluated.'
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UI.info(msg)
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Notifier.notify(msg)
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end
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# Evaluate the content of the `Guardfile`.
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#
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# @param [String] contents the content to evaluate.
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#
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def instance_eval_guardfile(contents)
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begin
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new.instance_eval(contents, @@options[:guardfile_path], 1)
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rescue
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UI.error "Invalid Guardfile, original error is:\n#{$!}"
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exit 1
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end
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new.instance_eval(contents, @@options[:guardfile_path], 1)
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rescue
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UI.error "Invalid Guardfile, original error is:\n#{ $! }"
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exit 1
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end
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# Test if the current `Guardfile` contains a specific Guard.
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#
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# @param [String] guard_name the name of the Guard
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# @return [Boolean] whether the Guard has been declared
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#
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def guardfile_include?(guard_name)
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guardfile_contents.match(/^guard\s*\(?\s*['":]#{guard_name}['"]?/)
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guardfile_contents.match(/^guard\s*\(?\s*['":]#{ guard_name }['"]?/)
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end
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# Read the current `Guardfile` content.
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#
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# @param [String] the path to the Guardfile
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#
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def read_guardfile(guardfile_path)
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begin
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@@options[:guardfile_path] = guardfile_path
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@@options[:guardfile_contents] = File.read(guardfile_path)
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rescue
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UI.error("Error reading file #{guardfile_path}")
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exit 1
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end
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@@options[:guardfile_path] = guardfile_path
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@@options[:guardfile_contents] = File.read(guardfile_path)
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rescue
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UI.error("Error reading file #{ guardfile_path }")
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exit 1
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end
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# Get the content to evaluate.
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#
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# @return [String] the content of the Guardfile.
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#
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def fetch_guardfile_contents
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# TODO: do we need .rc file interaction?
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if @@options[:guardfile_contents]
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UI.info "Using inline Guardfile."
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UI.info 'Using inline Guardfile.'
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@@options[:guardfile_path] = 'Inline Guardfile'
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elsif @@options[:guardfile]
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if File.exist?(@@options[:guardfile])
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read_guardfile(@@options[:guardfile])
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UI.info "Using Guardfile at #{@@options[:guardfile]}."
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UI.info "Using Guardfile at #{ @@options[:guardfile] }."
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else
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UI.error "No Guardfile exists at #{@@options[:guardfile]}."
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UI.error "No Guardfile exists at #{ @@options[:guardfile] }."
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exit 1
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end
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@ -64,57 +160,115 @@ module Guard
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if File.exist?(guardfile_default_path)
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read_guardfile(guardfile_default_path)
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else
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UI.error "No Guardfile found, please create one with `guard init`."
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UI.error 'No Guardfile found, please create one with `guard init`.'
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exit 1
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end
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end
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unless guardfile_contents_usable?
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UI.error "The command file(#{@@options[:guardfile]}) seems to be empty."
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UI.error "The command file(#{ @@options[:guardfile] }) seems to be empty."
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exit 1
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end
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end
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# Get the content of the `Guardfile`.
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#
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# @return [String] the Guardfile content
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#
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def guardfile_contents
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@@options ? @@options[:guardfile_contents] : ""
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@@options ? @@options[:guardfile_contents] : ''
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end
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# Get the content of the `Guardfile` and the global
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# user configuration file.
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#
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# @see #user_config_path
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#
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# @return [String] the Guardfile content
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#
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def guardfile_contents_with_user_config
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config = File.read(user_config_path) if File.exist?(user_config_path)
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[guardfile_contents, config].join("\n")
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end
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# Get the file path to the project `Guardfile`.
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#
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# @return [String] the path to the Guardfile
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#
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def guardfile_path
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@@options ? @@options[:guardfile_path] : ""
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@@options ? @@options[:guardfile_path] : ''
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end
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# Tests if the current `Guardfile` content is usable.
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#
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# @return [Boolean] if the Guardfile is usable
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#
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def guardfile_contents_usable?
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guardfile_contents && guardfile_contents.size >= 'guard :a'.size # smallest guard-definition
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end
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# Gets the default path of the `Guardfile`.
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# This returns the `Guardfile` from the current directory when existing,
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# or the global `Guardfile` at the home directory.
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#
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# @return [String] the path to the Guardfile
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#
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def guardfile_default_path
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File.exist?(local_guardfile_path) ? local_guardfile_path : home_guardfile_path
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end
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private
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private
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# The path to the `Guardfile` that is located at
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# the directory where Guard has been started from.
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#
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# @param [String] the path to the local Guardfile
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#
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def local_guardfile_path
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File.join(Dir.pwd, "Guardfile")
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File.join(Dir.pwd, 'Guardfile')
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end
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# The path to the `.Guardfile` that is located at
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# the users home directory.
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#
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# @param [String] the path to ~/.Guardfile
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#
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def home_guardfile_path
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File.expand_path(File.join("~", ".Guardfile"))
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File.expand_path(File.join('~', '.Guardfile'))
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end
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# The path to the user configuration `.guard.rb`
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# that is located at the users home directory.
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#
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# @param [String] the path to ~/.guard.rb
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#
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def user_config_path
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File.expand_path(File.join("~", ".guard.rb"))
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File.expand_path(File.join('~', '.guard.rb'))
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end
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end
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# Declares a group of guards to be run with `guard start --group group_name`
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#
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# @example Declare two groups of Guards
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# group 'backend' do
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# guard 'spork'
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# guard 'rspec'
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# end
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#
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# group 'frontend' do
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# guard 'passenger'
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# guard 'livereload'
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# end
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#
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# @param [String] name the group's name called from the CLI
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# @yield a block where you can declare several guards
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#
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# @see Dsl#guard
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#
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def group(name, &guard_definition)
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@groups = @@options[:group] || []
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name = name.to_sym
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name = name.to_sym
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if guard_definition && (@groups.empty? || @groups.map(&:to_sym).include?(name))
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@current_group = name
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@ -123,25 +277,71 @@ module Guard
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end
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end
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def guard(name, options = {}, &watch_and_callback_definition)
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# Declare a guard to be used when running `guard start`.
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#
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# The name parameter is usually the name of the gem without
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# the 'guard-' prefix.
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#
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# The available options are different for each Guard implementation.
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#
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# @example Declare a Guard
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# guard 'rspec' do
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# end
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#
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# @param [String] name the Guard name
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# @param [Hash] options the options accepted by the Guard
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# @yield a block where you can declare several watch patterns and actions
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#
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# @see Dsl#watch
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#
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def guard(name, options = {})
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@watchers = []
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@callbacks = []
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watch_and_callback_definition.call if watch_and_callback_definition
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yield if block_given?
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options.update(:group => (@current_group || :default))
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::Guard.add_guard(name.to_s.downcase.to_sym, @watchers, @callbacks, options)
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end
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# Define a pattern to be watched in order to run actions on file modification.
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#
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# @example Declare watchers for a Guard
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# guard 'rspec' do
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# watch('spec/spec_helper.rb')
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# watch(%r{^.+_spec.rb})
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# watch(%r{^app/controllers/(.+).rb}) { |m| 'spec/acceptance/#{m[1]}s_spec.rb' }
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# end
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#
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# @param [String, Regexp] pattern the pattern to be watched by the guard
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# @yield a block to be run when the pattern is matched
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# @yieldparam [MatchData] m matches of the pattern
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# @yieldreturn a directory, a filename, an array of directories / filenames, or nothing (can be an arbitrary command)
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#
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def watch(pattern, &action)
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@watchers << ::Guard::Watcher.new(pattern, action)
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end
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# Define a callback to execute arbitary code before or after any of
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# the `start`, `stop`, `reload`, `run_all` and `run_on_change` guards' method.
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#
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# @params [Array] args the callback arguments
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# @yield a block with listeners
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#
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def callback(*args, &listener)
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listener, events = args.size > 1 ? args : [listener, args[0]]
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@callbacks << { :events => events, :listener => listener }
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end
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# Ignore certain paths globally.
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#
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# @example Ignore some paths
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# ignore_paths .git, .svn
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#
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# @params [Array] paths the list of paths to ignore
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#
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def ignore_paths(*paths)
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UI.info "Ignoring paths: #{paths.join(', ')}"
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UI.info "Ignoring paths: #{ paths.join(', ') }"
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::Guard.listener.ignore_paths.push(*paths)
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end
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end
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