Undo last closed tab

spec/app/editor-spec.coffee

@@ -151,6 +151,13 @@ describe "Editor", ->
       expect(otherEditSession.buffer.subscriptionCount()).toBe 0
 
   describe "when 'close' is triggered", ->
+    it "adds a closed session path to the array", ->
+      editor.edit(rootView.project.buildEditSessionForPath())
+      editSession = editor.activeEditSession
+      expect(editor.closedEditSessions.length).toBe 0
+      editor.trigger "core:close"
+      expect(editor.closedEditSessions.length).toBe 1
+
     it "closes the active edit session and loads next edit session", ->
       editor.edit(rootView.project.buildEditSessionForPath())
       editSession = editor.activeEditSession
@@ -2664,3 +2671,15 @@ describe "Editor", ->
       editor.moveEditSessionToEditor(0, rightEditor, 0)
       expect(rightEditor.editSessions[0].getPath()).toBe jsPath
       expect(rightEditor.editSessions[1].getPath()).toBe txtPath
+
+  describe "when editor:undo-close-session is triggered", ->
+    it "opens the closed session back up", ->
+      rootView.open('sample.txt')
+      expect(editor.getPath()).toBe require.resolve('fixtures/sample.txt')
+      expect(editor.closedEditSessions.length).toBe 0
+      editor.trigger "core:close"
+      expect(editor.getPath()).toBe require.resolve('fixtures/sample.js')
+      expect(editor.closedEditSessions.length).toBe 1
+      editor.trigger 'editor:undo-close-session'
+      expect(editor.getPath()).toBe require.resolve('fixtures/sample.txt')
+      expect(editor.closedEditSessions.length).toBe 0

src/app/editor.coffee

@@ -48,6 +48,7 @@ class Editor extends View
   lineCache: null
   isFocused: false
   activeEditSession: null
+  closedEditSessions: null
   editSessions: null
   attached: false
   lineOverdraw: 10
@@ -74,6 +75,7 @@ class Editor extends View
     @cursorViews = []
     @selectionViews = []
     @editSessions = []
+    @closedEditSessions = []
     @pendingChanges = []
     @newCursors = []
     @newSelections = []
@@ -187,6 +189,7 @@ class Editor extends View
         'editor:move-line-up': @moveLineUp
         'editor:move-line-down': @moveLineDown
         'editor:duplicate-line': @duplicateLine
+        'editor:undo-close-session': @undoDestroySession
 
     documentation = {}
     for name, method of editorBindings
@@ -470,6 +473,9 @@ class Editor extends View
 
   getBuffer: -> @activeEditSession.buffer
 
+  undoDestroySession: ->
+    @rootView().open(@closedEditSessions.pop(), true) unless @closedEditSessions.length == 0
+
   destroyActiveEditSession: ->
     @destroyEditSessionIndex(@getActiveEditSessionIndex())
 
@@ -477,7 +483,9 @@ class Editor extends View
     return if @mini
 
     editSession = @editSessions[index]
-    destroySession = ->
+    destroySession = =>
+      path = editSession.getPath()
+      @closedEditSessions.push(path) unless @closedEditSessions.indexOf(path) > -1
       editSession.destroy()
       callback?(index)
 

src/app/keymaps/editor.cson

@@ -1,3 +1,6 @@
+'#root-view':
+  'meta-T': 'editor:undo-close-session'
+
 '.editor':
   'meta-s': 'editor:save'
   'meta-S': 'editor:save-as'