Double mouse click selects word

The mousedown event on editor is causing this to fail right now.

spec/atom/editor-spec.coffee

@@ -253,6 +253,14 @@ describe "Editor", ->
         editor.lines.trigger mousedownEvent({pageX, pageY})
         expect(editor.getCursorPosition()).toEqual(row: 3, column: 10)
 
+    describe "when doubleclick occurs in the editor", ->
+      it "selects the word under the cursor", ->
+        editor.attachToDom()
+        expect(editor.getCursorPosition()).toEqual(row: 0, column: 0)
+        [pageX, pageY] = window.pixelPositionForPoint(editor, [0, 8])
+        editor.lines.trigger mouseupEvent({pageX, pageY, originalEvent: {detail: 2}})
+        expect(editor.getSelectedText()).toBe "quicksort"
+
   describe "selection", ->
     selection = null
 

spec/atom/selection-spec.coffee

@@ -158,3 +158,33 @@ describe "Selection", ->
       selection.setRange new Range([0,4], [0,4])
       selection.copy()
       expect(atom.native.readFromPasteboard()).toBe 'first'
+
+  describe ".selectWord()", ->
+     describe "when the cursor is inside a word", ->
+       it "selects the entire word", ->
+         editor.setCursorPosition [0,8]
+         selection.selectWord()
+         expect(selection.getText()).toBe 'quicksort'
+
+     describe "when the cursor is on beginning of a word", ->
+       it "selects the entire word", ->
+         editor.setCursorPosition [0,4]
+         selection.selectWord()
+         expect(selection.getText()).toBe 'quicksort'
+
+     describe "when the cursor is at the end of a word", ->
+       it "selects the entire word", ->
+         editor.setCursorPosition [0,13]
+         selection.selectWord()
+         expect(selection.getText()).toBe 'quicksort'
+
+     describe "when the cursor is not on a word", ->
+       it "selects nothing", ->
+         editor.setCursorPosition [5,2]
+         selection.selectWord()
+         expect(selection.getText()).toBe ''
+
+
+
+
+

spec/spec-helper.coffee

@@ -35,6 +35,9 @@ window.clickEvent = (properties={}) ->
 window.mousedownEvent = (properties={}) ->
   $.Event "mousedown", properties
 
+window.mouseupEvent = (properties={}) ->
+  $.Event "mouseup", properties
+
 window.mousemoveEvent = (properties={}) ->
   $.Event "mousemove", properties
 

src/atom/editor.coffee

@@ -76,11 +76,17 @@ class Editor extends Template
         false
 
       @on 'mousedown', (e) =>
-        @setCursorPosition(@pointFromMouseEvent(e))
+        @setCursorPosition @pointFromMouseEvent(e)
         moveHandler = (e) => @selectToPosition(@pointFromMouseEvent(e))
         @on 'mousemove', moveHandler
         $(document).one 'mouseup', => @off 'mousemove', moveHandler
 
+      @on 'mouseup', (e) =>
+        clickCount = e.originalEvent.detail
+        if clickCount == 2
+          @setCursorPosition @pointFromMouseEvent(e)
+          @selection.selectWord()
+
       @hiddenInput.on "textInput", (e) =>
         @insertText(e.originalEvent.data)
 
@@ -182,6 +188,7 @@ class Editor extends Template
     getSelection: -> @selection
 
     getCurrentLine: -> @buffer.getLine(@getCursorRow())
+    getSelectedText: -> @selection.getText()
     moveCursorUp: -> @cursor.moveUp()
     moveCursorDown: -> @cursor.moveDown()
     moveCursorRight: -> @cursor.moveRight()

src/atom/selection.coffee

@@ -75,6 +75,9 @@ class Selection extends Template
       @modifySelection =>
         @cursor.setPosition(range.end)
 
+    getText: ->
+      @editor.buffer.getTextInRange @getRange()
+
     insertText: (text) ->
       @editor.buffer.change(@getRange(), text)
 
@@ -99,6 +102,21 @@ class Selection extends Template
       cursorPosition = @cursor.getPosition()
       @anchor = { getPosition: -> cursorPosition }
 
+    selectWord: ->
+      row = @cursor.getRow()
+      column = @cursor.getColumn()
+
+      line = @editor.buffer.getLine(row)
+      leftSide = line[0...column].split('').reverse().join('') # reverse left side
+      rightSide = line[column..]
+
+      regex = /^\w*/
+      startOffset = -regex.exec(leftSide)?[0]?.length or 0
+      endOffset = regex.exec(rightSide)?[0]?.length or 0
+
+      range = new Range([row, column + startOffset], [row, column + endOffset])
+      @setRange range
+
     selectRight: ->
       @modifySelection =>
         @cursor.moveRight()