Cursor can be re-positioned with the mouse

spec/atom/editor-spec.coffee

@@ -262,6 +262,21 @@ describe "Editor", ->
 
             expect(editor.getCursorPosition()).toEqual(lastPosition)
 
+    describe "when a click event occurs in the editor", ->
+      it "re-positions the cursor to the clicked row / column", ->
+        editor.attachToDom()
+        editor.css(position: 'absolute', top: 10, left: 10)
+        pageX = editor.offset().left + 10 * editor.charWidth + 3
+        pageY = editor.offset().top + 4 * editor.lineHeight - 2
+
+        expect(editor.getCursorPosition()).toEqual(row: 0, column: 0)
+
+        editor.lines.trigger clickEvent({pageX, pageY})
+
+        expect(editor.getCursorPosition()).toEqual(row: 3, column: 10)
+
+
+
   describe "selection bindings", ->
     selection = null
 

spec/spec-helper.coffee

@@ -28,6 +28,9 @@ eventPropertiesFromPattern = (pattern) ->
 window.keydownEvent = (pattern, properties={}) ->
   $.Event "keydown", _.extend(eventPropertiesFromPattern(pattern), properties)
 
+window.clickEvent = (properties={}) ->
+  $.Event "click", properties
+
 window.waitsForPromise = (fn) ->
   window.waitsFor (moveOn) ->
     fn().done(moveOn)

src/atom/editor.coffee

@@ -67,6 +67,12 @@ class Editor extends Template
         @hiddenInput.focus()
         false
 
+      @on 'click', (e) =>
+        { pageX, pageY } = e
+        left = pageX - @lines.offset().left
+        top = pageY - @lines.offset().top
+        @setCursorPosition(@pointFromPixelPosition({left, top}))
+
       @hiddenInput.on "textInput", (e) =>
         @insertText(e.originalEvent.data)
 
@@ -127,6 +133,9 @@ class Editor extends Template
     pixelPositionFromPoint: ({row, column}) ->
       { top: row * @lineHeight, left: column * @charWidth }
 
+    pointFromPixelPosition: ({top, left}) ->
+      { row: Math.floor(top / @lineHeight), column: Math.floor(left / @charWidth) }
+
     calculateDimensions: ->
       fragment = $('<pre style="position: absolute; visibility: hidden;">x</pre>')
       @lines.append(fragment)