Support clicking line numbers in gutter

Clicking moves the cursor to the start of the
row and shift-clicking selects to the start of
the row

spec/app/editor-spec.coffee

@@ -1990,3 +1990,15 @@ describe "Editor", ->
 
       runs ->
         expect(editor.getText()).toBe(originalPathText)
+
+  describe "when clicking a gutter line", ->
+    it "moves the cursor to the start of the selected line", ->
+      rootView.attachToDom()
+      expect(editor.getCursorScreenPosition()).toEqual [0,0]
+      editor.gutter.find(".line-number:eq(1)").trigger 'click'
+      expect(editor.getCursorScreenPosition()).toEqual [1,0]
+
+    it "selects to the start of the selected line when shift is pressed", ->
+      expect(editor.getSelection().getScreenRange()).toEqual [0,0], [0,0]
+      editor.gutter.find(".line-number:eq(1)").trigger 'click', {shiftKey: true}
+      expect(editor.getSelection().getScreenRange()).toEqual [0,0], [1,0]

src/app/gutter.coffee

@@ -3,6 +3,7 @@
 $ = require 'jquery'
 _ = require 'underscore'
 Range = require 'range'
+Point = require 'point'
 
 module.exports =
 class Gutter extends View
@@ -22,6 +23,14 @@ class Gutter extends View
     highlightLines = => @highlightLines()
     editor.on 'cursor-move', highlightLines
     editor.on 'selection-change', highlightLines
+    @on 'click', '.line-number', (e) =>
+      row = parseInt($(e.target).text()) - 1
+      position = new Point(row, 0)
+      if e.shiftKey
+        @editor().selectToScreenPosition(position)
+      else
+        @editor().setCursorScreenPosition(position)
+
     @calculateWidth()
 
   editor: ->