Project.scan scans buffer if the file is modified

Closes #487

spec/project-spec.coffee

@@ -429,3 +429,16 @@ describe "Project", ->
 
         runs ->
           expect(resultHandler).not.toHaveBeenCalled()
+
+      it "scans buffer contents if the buffer is modified", ->
+        editSession = project.openSync("a")
+        editSession.setText("Elephant")
+        results = []
+        waitsForPromise ->
+          project.scan /a|Elephant/, (result) -> results.push result
+
+        runs ->
+          expect(results).toHaveLength 3
+          resultForA = _.find results, ({filePath}) -> path.basename(filePath) == 'a'
+          expect(resultForA.matches).toHaveLength 1
+          expect(resultForA.matches[0].matchText).toBe 'Elephant'

src/project.coffee

@@ -218,6 +218,11 @@ class Project
   getBuffers: ->
     new Array(@buffers...)
 
+  isPathModified: (filePath) ->
+    absoluteFilePath = @resolve(filePath)
+    existingBuffer = _.find @buffers, (buffer) -> buffer.getPath() == absoluteFilePath
+    existingBuffer?.isModified()
+
   # Private: Only to be used in specs
   bufferForPathSync: (filePath, text) ->
     absoluteFilePath = @resolve(filePath)
@@ -315,12 +320,18 @@ class Project
       deferred.resolve()
 
     task.on 'scan:result-found', (result) =>
-      iterator(result)
+      iterator(result) unless @isPathModified(result.filePath)
 
     if _.isFunction(options.onPathsSearched)
       task.on 'scan:paths-searched', (numberOfPathsSearched) ->
         options.onPathsSearched(numberOfPathsSearched)
 
+    for buffer in @buffers when buffer.isModified()
+      filePath = buffer.getPath()
+      matches = []
+      buffer.scan regex, (match) -> matches.push match
+      iterator {filePath, matches} if matches.length > 0
+
     deferred.promise
 
   # Private: