Display error if no files match word under cursor

src/packages/fuzzy-finder/spec/fuzzy-finder-spec.coffee

@@ -304,6 +304,31 @@ describe 'FuzzyFinder', ->
         expect(finder).not.toBeVisible()
         expect(openedPath).toBe "sample.txt"
 
+    it "displays error when the word under the cursor doesn't match any files", ->
+      editor.setText("moogoogaipan")
+      editor.setCursorBufferPosition([0,5])
+
+      rootView.trigger 'fuzzy-finder:find-under-cursor'
+
+      waitsFor ->
+        finder.is(':visible')
+
+      runs ->
+        expect(finder.find('.error').text().length).toBeGreaterThan 0
+
+    it "displays error when there is no word under the cursor", ->
+      editor.setText("&&&&&&&&&&&&&&& sample")
+      editor.setCursorBufferPosition([0,5])
+
+      rootView.trigger 'fuzzy-finder:find-under-cursor'
+
+      waitsFor ->
+        finder.is(':visible')
+
+      runs ->
+        expect(finder.find('.error').text().length).toBeGreaterThan 0
+
+
   describe "opening a path into a split", ->
     beforeEach ->
       rootView.attachToDom()

src/packages/fuzzy-finder/src/fuzzy-finder.coffee

@@ -105,13 +105,20 @@ class FuzzyFinder extends SelectList
       editor = @rootView.getActiveEditor()
       range = editor.getCursor().getCurrentWordBufferRange(wordRegex: @filenameRegex)
       currentWord = editor.getTextInRange(range)
-      if currentWord?
-        @populateProjectPaths(filter: currentWord, done: (paths) =>
-          if paths?.length == 1
-            @rootView.open(paths[0])
-          else if paths?.length
+
+      if currentWord.length == 0
+        @attach()
+        @setError('The cursor is not over a filename')
+      else
+        @populateProjectPaths filter: currentWord, done: (paths) =>
+          if paths.length == 0
             @attach()
-            @miniEditor.setText('' + currentWord))
+            @setError('No files match \'currentWord\'')
+          else if paths.length == 1
+            @rootView.open(paths[0])
+          else
+            @attach()
+            @miniEditor.setText(currentWord)
 
   populateProjectPaths: (options = {}) ->
     if @projectPaths?.length > 0