Merge branch 'master' of http://github.com/oliamb/guard into oliamb-master

Conflicts:
	lib/guard/guard.rb

README.rdoc

@@ -136,15 +136,16 @@ lib/guard/guard-name.rb inherit from guard/guard and should overwrite at least o
         # = Guard method =
         # ================
         
+        # If one of those methods raise an exception, the Guard instance
+        # will be removed from the active guard.
+        
         # Call once when guard starts
         # Please override initialize method to init stuff
         def start
           true
         end
         
-        # Call with Ctrl-C signal (when Guard quit).
-        # This method must return a true value 
-        # if everything went well or guard will not stop.
+        # Call with Ctrl-C signal (when Guard quit)
         def stop
           true
         end

lib/guard.rb

@@ -12,10 +12,16 @@ module Guard
   class << self
     attr_accessor :options, :guards, :listener
     
-    def start(options = {})
+    # initialize this singleton
+    def init(options = {})
       @options  = options
       @listener = Listener.init
       @guards   = []
+      return self
+    end
+    
+    def start(options = {})
+      init options
       
       Dsl.evaluate_guardfile
       if guards.empty?
@@ -27,13 +33,13 @@ module Guard
           run do
             guards.each do |guard|
               paths = Watcher.match_files(guard, files)
-              guard.run_on_change(paths) unless paths.empty?
+              supervised_task(guard, :run_on_change, paths) unless paths.empty?
             end
           end
         end
         
         UI.info "Guard is now watching at '#{Dir.pwd}'"
-        guards.each { |g| g.start }
+        guards.each { |g| supervised_task(g, :start) }
         listener.start
       end
     end
@@ -54,6 +60,19 @@ module Guard
       UI.error "Could not find gem 'guard-#{name}' in the current Gemfile."
     end
     
+    # Let a guard execute his task but
+    # fire it if his work lead to system failure
+    def supervised_task(guard, task_to_supervise, *args)
+      begin
+        guard.send(task_to_supervise, *args)
+      rescue Exception
+        UI.error("#{guard.class.name} guard failed to achieve its <#{task_to_supervise.to_s}> command: #{$!}")
+        ::Guard.guards.delete guard
+        UI.info("Guard #{guard.class.name} has just been fired")
+        return $!
+      end
+    end
+    
     def locate_guard(name)
       `gem open guard-#{name} --latest --command echo`.chomp
     rescue

lib/guard/guard.rb

@@ -33,7 +33,6 @@ module Guard
     end
     
     # Call once when guard quit
-    # Retrieve a true value if the instance successfuly stopped
     def stop
       true
     end

lib/guard/interactor.rb

@@ -5,25 +5,22 @@ module Guard
       # Run all (Ctrl-\)
       Signal.trap('QUIT') do
         ::Guard.run do
-          ::Guard.guards.each { |g| g.run_all }
+          ::Guard.guards.each { |g| ::Guard.supervised_task g, :run_all }
         end
       end
       
       # Stop (Ctrl-C)
       Signal.trap('INT') do
         ::Guard.listener.stop
-        if ::Guard.guards.all? { |g| g.stop }
+        ::Guard.guards.each { |g| ::Guard.supervised_task g, :stop }
         UI.info "Bye bye...", :reset => true
         abort("\n")
-        else
-          ::Guard.listener.start
-        end
       end
       
       # Reload (Ctrl-Z)
       Signal.trap('TSTP') do
         ::Guard.run do
-          ::Guard.guards.each { |g| g.reload }
+          ::Guard.guards.each { |g| ::Guard.supervised_task g, :reload }
         end
       end
     end

spec/guard_spec.rb

@@ -1,5 +1,19 @@
 require 'spec_helper'
 
+# mute UI
+module Guard::UI
+  class << self
+    def info(message, options = {})
+    end
+    
+    def error(message)
+    end
+    
+    def debug(message)
+    end
+  end
+end
+
 describe Guard do
   
   describe "get_guard_class" do
@@ -20,4 +34,64 @@ describe Guard do
     
   end
   
+  describe "init" do
+    subject { ::Guard.init }
+    
+    it "Should retrieve itself for chaining" do
+      subject.should be_kind_of Module
+    end
+    
+    it "Should init guards array" do
+      ::Guard.guards.should be_kind_of Array
+    end
+    
+    it "Should init options" do
+      opts = {:my_opts => true}
+      ::Guard.init(opts).options.should be_include :my_opts
+    end
+    
+    it "Should init listeners" do
+      ::Guard.listener.should be_kind_of Guard::Listener
+    end
+  end
+  
+  describe "supervised_task" do
+    subject {::Guard.init}
+    
+    before :each do
+      @g = mock(Guard::Guard)
+      @g.stub!(:regular).and_return { true }
+      @g.stub!(:spy).and_return { raise "I break your system" }
+      @g.stub!(:pirate).and_raise Exception.new("I blow your system up")
+      @g.stub!(:regular_arg).with("given_path").and_return { "given_path" }
+      subject.guards.push @g
+    end
+    
+    it "should let it go when nothing special occurs" do
+      subject.guards.should be_include @g
+      subject.supervised_task(@g, :regular).should be_true
+      subject.guards.should be_include @g
+    end
+    
+    it "should let it work with some tools" do
+      subject.guards.should be_include @g
+      subject.supervised_task(@g, :regular).should be_true
+      subject.guards.should be_include @g
+    end
+    
+    it "should fire the guard on spy act discovery" do
+      subject.guards.should be_include @g
+      ::Guard.supervised_task(@g, :spy).should be_kind_of Exception
+      subject.guards.should_not be_include @g
+      ::Guard.supervised_task(@g, :spy).message.should == 'I break your system'
+    end
+    
+    it "should fire the guard on pirate act discovery" do
+      subject.guards.should be_include @g
+      ::Guard.supervised_task(@g, :regular_arg, "given_path").should be_kind_of String
+      subject.guards.should be_include @g
+      ::Guard.supervised_task(@g, :regular_arg, "given_path").should == "given_path"
+    end
+  end
+  
 end