Add DisplayBuffer.findMarker[s]

spec/app/display-buffer-spec.coffee

@@ -726,6 +726,16 @@ describe "DisplayBuffer", ->
         expect(changeHandler).toHaveBeenCalled()
         expect(observeHandler).toHaveBeenCalled()
 
+    describe ".findMarkers(attributes)", ->
+      it "allows the startBufferRow and endBufferRow to be specified", ->
+        marker1 = displayBuffer.markBufferRange([[0, 0], [3, 0]], class: 'a')
+        marker2 = displayBuffer.markBufferRange([[0, 0], [5, 0]], class: 'a')
+        marker3 = displayBuffer.markBufferRange([[9, 0], [10, 0]], class: 'b')
+
+        expect(displayBuffer.findMarkers(class: 'a', startBufferRow: 0)).toEqual [marker2, marker1]
+        expect(displayBuffer.findMarkers(class: 'a', startBufferRow: 0, endBufferRow: 3)).toEqual [marker1]
+        expect(displayBuffer.findMarkers(endBufferRow: 10)).toEqual [marker3]
+
     describe "marker destruction", ->
       it "allows markers to be destroyed", ->
         marker = displayBuffer.markScreenRange([[5, 4], [5, 10]])

src/app/display-buffer.coffee

@@ -673,6 +673,16 @@ class DisplayBuffer
   observeMarker: (id, callback) ->
     @getMarker(id).observe(callback)
 
+  findMarker: (attributes) ->
+    @findMarkers(attributes)[0]
+
+  findMarkers: (attributes) ->
+    { startBufferRow, endBufferRow } = attributes
+    attributes.startRow = startBufferRow if startBufferRow?
+    attributes.endRow = endBufferRow if endBufferRow?
+    attributes = _.omit(attributes, ['startBufferRow', 'endBufferRow'])
+    @buffer.findMarkers(attributes)
+
   ###
   # Internal #
   ###