don't run on change if paths are empty

Rakefile

@@ -6,3 +6,27 @@ task :push_everywhere do
   system %{git push origin master}
   system %{git push guard master}
 end
+
+namespace :spec do
+  desc "Run on three Rubies"
+  task :platforms do
+    current = %x{rvm-prompt v}
+    
+    fail = false
+    %w{1.8.7 1.9.2 ree}.each do |version|
+      puts "Switching to #{version}"
+      system %{rvm #{version}}
+      system %{bundle exec rspec spec}
+      if $?.exitstatus != 0
+        fail = true
+        break
+      end
+    end
+
+    system %{rvm #{current}}
+
+    exit (fail ? 1 : 0)
+  end
+end
+
+task :default => 'spec:platforms'

lib/guard/jasmine-headless-webkit.rb

@@ -26,7 +26,11 @@ module Guard
       @ran_jammit = false
       if run_before and run_jammit
         @ran_jammit = true
-        run_all if JasmineHeadlessWebkitRunner.run(paths) == 0
+        do_run_all = true
+        if !paths.empty?
+          do_run_all = (JasmineHeadlessWebkitRunner.run(paths) == 0)
+        end
+        run_all if do_run_all
       end
     end
 

spec/lib/guard/jasmine-headless-webkit_spec.rb

@@ -44,6 +44,15 @@ describe Guard::JasmineHeadlessWebkit do
         guard.run_on_change(%w{test})
       end
     end
+
+    context 'no files given, just run all' do
+      it 'should run all but not run once' do
+        Guard::JasmineHeadlessWebkitRunner.expects(:run).never
+        guard.expects(:run_all).once
+
+        guard.run_on_change([])
+      end
+    end
   end
 
   context 'with run_before' do
@@ -97,7 +106,7 @@ describe Guard::JasmineHeadlessWebkit do
       let(:options) { { :jammit => true } }
 
       it "should run jammit only once" do
-        guard.run_on_change([])
+        guard.run_on_change(%w{path.txt})
       end
     end
   end