Extract code from signal handlers into methods

This will allow building other mechanisms to interact with Guard, for
example on JRuby, where signal handling tends to be unreliable.

lib/guard/interactor.rb

@@ -1,29 +1,41 @@
 module Guard
   module Interactor
+    extend self
 
-    def self.init_signal_traps
-      # Run all (Ctrl-\)
-      Signal.trap('QUIT') do
+    def run_all
       ::Guard.run do
         ::Guard.guards.each { |guard| ::Guard.supervised_task(guard, :run_all) }
       end
     end
 
-      # Stop (Ctrl-C)
-      Signal.trap('INT') do
+    def stop
       UI.info "Bye bye...", :reset => true
       ::Guard.listener.stop
       ::Guard.guards.each { |guard| ::Guard.supervised_task(guard, :stop) }
       abort("\n")
     end
 
-      # Reload (Ctrl-Z)
-      Signal.trap('TSTP') do
+    def reload
       ::Guard.run do
         ::Guard.guards.each { |guard| ::Guard.supervised_task(guard, :reload) }
       end
     end
+
+    def self.init_signal_traps
+      # Run all (Ctrl-\)
+      Signal.trap('QUIT') do
+        run_all
       end
 
+      # Stop (Ctrl-C)
+      Signal.trap('INT') do
+        stop
+      end
+
+      # Reload (Ctrl-Z)
+      Signal.trap('TSTP') do
+        reload
+      end
+    end
   end
 end

spec/guard/interactor_spec.rb

@@ -0,0 +1,25 @@
+require 'spec_helper'
+
+describe Guard::Interactor do
+  subject { Guard::Interactor }
+  let(:guard) { mock "guard" }
+  before :each do
+    Guard.stub!(:guards).and_return([guard])
+    Guard.stub!(:listener).and_return(mock(:start => nil, :stop => nil))
+  end
+
+  it ".run_all should send :run_all to all guards" do
+    guard.should_receive(:run_all)
+    subject.run_all
+  end
+
+  it ".stop should send :stop to all guards" do
+    guard.should_receive(:stop)
+    lambda { subject.stop }.should raise_error(SystemExit)
+  end
+
+  it ".reload should send :reload to all guards" do
+    guard.should_receive(:reload)
+    subject.reload
+  end
+end