Fix bug that occurred when pattern was a string and no action was associated.

lib/guard/watcher.rb

@@ -46,7 +46,7 @@ module Guard
       if @pattern.is_a?(Regexp)
         file.match(@pattern)
       else
-        file == @pattern
+        file == @pattern ? [file] : nil
       end
     end
     

spec/guard/watcher_spec.rb

@@ -41,6 +41,7 @@ describe Guard::Watcher do
     before(:all) { @guard = Guard::Guard.new }
     
     describe "a watcher's with no action" do
+      context "regex pattern" do
         before(:all) { @guard.watchers = [Guard::Watcher.new(/.*_spec\.rb/)] }
         
         it "should return paths as they came" do
@@ -48,6 +49,15 @@ describe Guard::Watcher do
         end
       end
       
+      context "string pattern" do
+        before(:all) { @guard.watchers = [Guard::Watcher.new('guard_rocks_spec.rb')] }
+        
+        it "should return paths as they came" do
+          Guard::Watcher.match_files(@guard, ['guard_rocks_spec.rb']).should == ['guard_rocks_spec.rb']
+        end
+      end
+    end
+    
     describe "a watcher's action with an arity equal to 0" do
       before(:all) do
         @guard.watchers = [
@@ -56,7 +66,7 @@ describe Guard::Watcher do
           Guard::Watcher.new('hash.rb',        lambda { Hash[:foo, 'bar'] }),
           Guard::Watcher.new('array.rb',       lambda { ['foo', 'bar'] }),
           Guard::Watcher.new('blank.rb',       lambda { '' }),
-          Guard::Watcher.new('uptime.rb',      lambda { `uptime > /dev/null` })
+          Guard::Watcher.new(/^uptime\.rb/,    lambda { `uptime > /dev/null` })
         ]
       end