385 lines
12 KiB
Ruby
385 lines
12 KiB
Ruby
# Guard is the main module for all Guard related modules and classes.
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# Also other Guard implementation should use this namespace.
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#
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module Guard
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autoload :UI, 'guard/ui'
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autoload :Dsl, 'guard/dsl'
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autoload :DslDescriber, 'guard/dsl_describer'
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autoload :Group, 'guard/group'
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autoload :Interactor, 'guard/interactor'
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autoload :Listener, 'guard/listener'
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autoload :Watcher, 'guard/watcher'
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autoload :Notifier, 'guard/notifier'
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autoload :Hook, 'guard/hook'
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class << self
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attr_accessor :options, :interactor, :listener
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# Initialize the Guard singleton.
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#
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# @option options [Boolean] clear if auto clear the UI should be done
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# @option options [Boolean] notify if system notifications should be shown
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# @option options [Boolean] debug if debug output should be shown
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# @option options [Array<String>] group the list of groups to start
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# @option options [String] watchdir the director to watch
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# @option options [String] guardfile the path to the Guardfile
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# @option options [Boolean] watch_all_modifications watches all file modifications if true
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#
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def setup(options = {})
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@options = options
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@guards = []
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@groups = [Group.new(:default)]
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@interactor = Interactor.new
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@listener = Listener.select_and_init(@options[:watchdir] ? File.expand_path(@options[:watchdir]) : Dir.pwd, options)
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@options[:notify] && ENV['GUARD_NOTIFY'] != 'false' ? Notifier.turn_on : Notifier.turn_off
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UI.clear if @options[:clear]
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debug_command_execution if @options[:debug]
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self
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end
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# Smart accessor for retrieving a specific guard or several guards at once.
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#
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# @param [String, Symbol] filter return the guard with the given name, or nil if not found
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# @param [Regexp] filter returns all guards matching the Regexp, or [] if no guard found
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# @param [Hash] filter returns all guards matching the given Hash.
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# Example: `{ :name => 'rspec', :group => 'backend' }`, or [] if no guard found
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# @param [NilClass] filter returns all guards
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#
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# @see Guard.groups
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#
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def guards(filter = nil)
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case filter
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when String, Symbol
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@guards.find { |guard| guard.class.to_s.downcase.sub('guard::', '') == filter.to_s.downcase.gsub('-', '') }
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when Regexp
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@guards.find_all { |guard| guard.class.to_s.downcase.sub('guard::', '') =~ filter }
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when Hash
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filter.inject(@guards) do |matches, (k, v)|
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if k.to_sym == :name
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matches.find_all { |guard| guard.class.to_s.downcase.sub('guard::', '') == v.to_s.downcase.gsub('-', '') }
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else
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matches.find_all { |guard| guard.send(k).to_sym == v.to_sym }
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end
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end
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else
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@guards
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end
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end
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# Smart accessor for retrieving a specific group or several groups at once.
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#
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# @param [NilClass] filter returns all groups
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# @param [String, Symbol] filter return the group with the given name, or nil if not found
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# @param [Regexp] filter returns all groups matching the Regexp, or [] if no group found
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#
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# @see Guard.guards
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#
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def groups(filter = nil)
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case filter
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when String, Symbol
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@groups.find { |group| group.name == filter.to_sym }
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when Regexp
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@groups.find_all { |group| group.name.to_s =~ filter }
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else
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@groups
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end
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end
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# Start Guard by evaluate the `Guardfile`, initialize the declared Guards
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# and start the available file change listener.
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#
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# @option options [Boolean] clear if auto clear the UI should be done
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# @option options [Boolean] notify if system notifications should be shown
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# @option options [Boolean] debug if debug output should be shown
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# @option options [Array<String>] group the list of groups to start
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# @option options [String] watchdir the director to watch
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# @option options [String] guardfile the path to the Guardfile
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#
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def start(options = {})
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setup(options)
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Dsl.evaluate_guardfile(options)
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listener.on_change do |files|
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Dsl.reevaluate_guardfile if Watcher.match_guardfile?(files)
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listener.changed_files += files if Watcher.match_files?(guards, files)
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end
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UI.info "Guard is now watching at '#{ listener.directory }'"
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run_guard_task(:start)
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interactor.start
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listener.start
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end
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# Stop Guard listening to file changes
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#
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def stop
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UI.info 'Bye bye...', :reset => true
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listener.stop
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run_guard_task(:stop)
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abort
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end
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# Reload all Guards currently enabled.
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#
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def reload
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run do
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run_guard_task(:reload)
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end
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end
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# Trigger `run_all` on all Guards currently enabled.
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#
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def run_all
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run do
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run_guard_task(:run_all)
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end
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end
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# Pause Guard listening to file changes.
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#
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def pause
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if listener.locked
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UI.info 'Un-paused files modification listening', :reset => true
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listener.clear_changed_files
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listener.unlock
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else
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UI.info 'Paused files modification listening', :reset => true
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listener.lock
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end
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end
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# Trigger `run_on_change` on all Guards currently enabled.
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#
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def run_on_change(paths)
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run do
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run_guard_task(:run_on_change, paths)
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end
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end
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# Run a block where the listener and the interactor is
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# blocked.
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#
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# @yield the block to run
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#
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def run
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listener.lock
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interactor.lock
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UI.clear if options[:clear]
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begin
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yield
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rescue Interrupt
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end
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interactor.unlock
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listener.unlock
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end
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# Loop through all groups and run the given task for each Guard.
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#
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# Stop the task run for the all Guards within a group if one Guard
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# throws `:task_has_failed` and the group has its `:halt_on_fail` option to `true`.
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#
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# @param [Symbol] task the task to run
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# @param [Array<String>] files the list of files to pass to the task
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#
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def run_guard_task(task, files = nil)
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groups.each do |group|
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catch group.options[:halt_on_fail] == true ? :task_has_failed : :no_catch do
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guards(:group => group.name).each do |guard|
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if task == :run_on_change
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run_on_change_task(files, guard, task)
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else
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run_supervised_task(guard, task)
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end
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end
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end
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end
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end
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# Run the `:run_on_change` task. When the option `:watch_all_modifications` is set,
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# the task is split to run changed paths on {Guard::Guard#run_on_change}, whereas
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# deleted paths run on {Guard::Guard#run_on_deletion}.
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#
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# @param [Array<String>] files the list of files to pass to the task
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# @param [Guard::Guard] guard the guard to run
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# @param [Symbol] task the task to run
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#
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def run_on_change_task(files, guard, task)
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paths = Watcher.match_files(guard, files)
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changes = changed_paths(paths)
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deletions = deleted_paths(paths)
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unless changes.empty?
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UI.debug "#{ guard.class.name }##{ task } with #{ changes.inspect }"
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run_supervised_task(guard, task, changes)
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end
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unless deletions.empty?
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UI.debug "#{ guard.class.name }#run_on_deletion with #{ deletions.inspect }"
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run_supervised_task(guard, :run_on_deletion, deletions)
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end
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end
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# Detects the paths that have changed.
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#
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# Deleted paths are prefixed by an exclamation point.
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# @see Guard::Listener#modified_files
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#
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# @param [Array<String>] paths the watched paths
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# @return [Array<String>] the changed paths
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#
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def changed_paths(paths)
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paths.select { |f| !f.start_with?('!') }
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end
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# Detects the paths that have been deleted.
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#
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# Deleted paths are prefixed by an exclamation point.
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# @see Guard::Listener#modified_files
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#
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# @param [Array<String>] paths the watched paths
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# @return [Array<String>] the deleted paths
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#
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def deleted_paths(paths)
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paths.select { |f| f.start_with?('!') }.map { |f| f.slice(1..-1) }
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end
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# Run a Guard task, but remove the Guard when his work leads to a system failure.
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#
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# @param [Guard::Guard] guard the Guard to execute
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# @param [Symbol] task the task to run
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# @param [Array] args the arguments for the task
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# @return [Boolean, Exception] the result of the Guard
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#
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def run_supervised_task(guard, task, *args)
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guard.hook("#{ task }_begin", *args)
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result = guard.send(task, *args)
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guard.hook("#{ task }_end", result)
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result
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rescue Exception => ex
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UI.error("#{ guard.class.name } failed to achieve its <#{ task.to_s }>, exception was:" +
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"\n#{ ex.class }: #{ ex.message }\n#{ ex.backtrace.join("\n") }")
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guards.delete guard
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UI.info("\n#{ guard.class.name } has just been fired")
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ex
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end
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# Add a Guard to use.
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#
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# @param [String] name the Guard name
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# @param [Array<Watcher>] watchers the list of declared watchers
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# @param [Array<Hash>] callbacks the list of callbacks
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# @param [Hash] options the Guard options (see the given Guard documentation)
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#
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def add_guard(name, watchers = [], callbacks = [], options = {})
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if name.to_sym == :ego
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UI.deprecation('Guard::Ego is now part of Guard. You can remove it from your Guardfile.')
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else
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guard_class = get_guard_class(name)
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callbacks.each { |callback| Hook.add_callback(callback[:listener], guard_class, callback[:events]) }
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@guards << guard_class.new(watchers, options)
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end
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end
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# Add a Guard group.
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#
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# @param [String] name the group name
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# @option options [Boolean] halt_on_fail if a task execution
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# should be halted for all Guards in this group if one Guard throws `:task_has_failed`
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# @return [Guard::Group] the group added (or retrieved from the `@groups` variable if already present)
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#
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def add_group(name, options = {})
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group = groups(name)
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if group.nil?
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group = Group.new(name, options)
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@groups << group
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end
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group
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end
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# Tries to load the Guard main class.
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#
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# @param [String] name the name of the Guard
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# @return [Class, nil] the loaded class
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#
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def get_guard_class(name)
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name = name.to_s
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try_require = false
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const_name = name.downcase.gsub('-', '')
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begin
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require "guard/#{ name.downcase }" if try_require
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self.const_get(self.constants.find { |c| c.to_s.downcase == const_name })
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rescue TypeError
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unless try_require
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try_require = true
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retry
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else
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UI.error "Could not find class Guard::#{ const_name.capitalize }"
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end
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rescue LoadError => loadError
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UI.error "Could not load 'guard/#{ name.downcase }' or find class Guard::#{ const_name.capitalize }"
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UI.error loadError.to_s
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end
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end
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# Locate a path to a Guard gem.
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#
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# @param [String] name the name of the Guard without the prefix `guard-`
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# @return [String] the full path to the Guard gem
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#
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def locate_guard(name)
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if Gem::Version.create(Gem::VERSION) >= Gem::Version.create('1.8.0')
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Gem::Specification.find_by_name("guard-#{ name }").full_gem_path
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else
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Gem.source_index.find_name("guard-#{ name }").last.full_gem_path
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end
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rescue
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UI.error "Could not find 'guard-#{ name }' gem path."
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end
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# Returns a list of guard Gem names installed locally.
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#
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# @return [Array<String>] a list of guard gem names
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#
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def guard_gem_names
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if Gem::Version.create(Gem::VERSION) >= Gem::Version.create('1.8.0')
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Gem::Specification.find_all.select { |x| x.name =~ /^guard-/ }
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else
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Gem.source_index.find_name(/^guard-/)
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end.map { |x| x.name.sub /^guard-/, '' }
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end
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# Adds a command logger in debug mode. This wraps common command
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# execution functions and logs the executed command before execution.
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#
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def debug_command_execution
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Kernel.send(:alias_method, :original_system, :system)
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Kernel.send(:define_method, :system) do |command, *args|
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::Guard::UI.debug "Command execution: #{ command } #{ args.join(' ') }"
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original_system command, *args
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end
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Kernel.send(:alias_method, :original_backtick, :'`')
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Kernel.send(:define_method, :'`') do |command|
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::Guard::UI.debug "Command execution: #{ command }"
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original_backtick command
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end
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end
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end
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end
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