show warning when no browsers are connected

lib/guard/livereload/reactor.rb

@@ -32,7 +32,6 @@ def initialize(options)
         @sockets = Sockets.new
         @options = options
         @thread = Thread.new { _start_reactor }
-        @connections_count = 0
       end
 
       def sockets
@@ -59,6 +58,11 @@ def stop
 
       def reload_browser(paths = [])
         msg = "Reloading browser: #{paths.join(' ')}"
+
+        if sockets.empty?
+          Compat::UI.warning "No browsers connected at this time! Browser won't refresh!"
+        end
+
         Compat::UI.info msg
         if options[:notify]
           Compat::UI.notify(msg, title: 'Reloading browser', image: :success)

lib/guard/livereload/reactor/sockets.rb

@@ -29,6 +29,10 @@ def add(socket)
         def delete(socket)
           @mutex.synchronize { @sockets.delete(socket) }
         end
+
+        def empty?
+          @mutex.synchronize { @sockets.empty? }
+        end
       end
     end
   end

spec/lib/guard/livereload/reactor_spec.rb

@@ -15,6 +15,7 @@
   describe '#reload_browser(paths = [])' do
     before do
       allow(sockets).to receive(:broadcast)
+      allow(sockets).to receive(:empty?).and_return(false)
     end
 
     it 'displays a message' do
@@ -64,6 +65,20 @@
           subject.reload_browser(paths)
         end
       end
+
+    end
+
+    context 'with no connected browsers' do
+      subject { new_live_reactor }
+
+      before do
+        allow(sockets).to receive(:empty?).and_return(true)
+      end
+
+      it 'shows a warning' do
+        expect(Guard::Compat::UI).to receive(:warning).with(/No browsers connected at this time!/)
+        subject.reload_browser(paths)
+      end
     end
   end