meta-{ goes to previous buffer

spec/app/editor-spec.coffee

@@ -2097,8 +2097,7 @@ describe "Editor", ->
       editor.buffer.setPath("new.txt")
       expect(eventHandler).toHaveBeenCalled()
 
-
-  fdescribe ".loadNextEditorState()", ->
+  describe ".loadNextEditorState()", ->
     it "loads the next editor state and wraps to beginning when end is reached", ->
       buffer0 = new Buffer("0")
       buffer1 = new Buffer("1")
@@ -2114,3 +2113,20 @@ describe "Editor", ->
       expect(editor.buffer.path).toBe "1"
       editor.loadNextEditorState()
       expect(editor.buffer.path).toBe "2"
+
+  describe ".loadPreviousEditorState()", ->
+    it "loads the next editor state and wraps to beginning when end is reached", ->
+      buffer0 = new Buffer("0")
+      buffer1 = new Buffer("1")
+      buffer2 = new Buffer("2")
+      editor = new Editor {buffer: buffer0}
+      editor.setBuffer(buffer1)
+      editor.setBuffer(buffer2)
+
+      expect(editor.buffer.path).toBe "2"
+      editor.loadPreviousEditorState()
+      expect(editor.buffer.path).toBe "1"
+      editor.loadPreviousEditorState()
+      expect(editor.buffer.path).toBe "0"
+      editor.loadPreviousEditorState()
+      expect(editor.buffer.path).toBe "2"

src/app/editor.coffee

@@ -85,6 +85,7 @@ class Editor extends View
     @on 'split-down', => @splitDown()
     @on 'close', => @remove(); false
     @on 'show-next-buffer', => @loadNextEditorState()
+    @on 'show-previous-buffer', => @loadPreviousEditorState()
 
     @on 'move-to-top', => @moveCursorToTop()
     @on 'move-to-bottom', => @moveCursorToBottom()
@@ -251,6 +252,12 @@ class Editor extends View
       nextIndex = (index + 1) % @editorStates.length
       @setEditorState(@editorStates[nextIndex])
 
+  loadPreviousEditorState: ->
+    index = @indexOfEditorState(@getEditorState())
+    if index?
+      previousIndex = if --index >= 0 then index else @editorStates.length - 1
+      @setEditorState(@editorStates[previousIndex])
+
   setEditorState: (editorState={}) ->
     buffer = editorState.buffer ?= new Buffer
     @setEditorStateForBuffer(buffer, editorState)

src/app/keymaps/editor.coffee

@@ -31,4 +31,5 @@ window.keymap.bindKeys '.editor',
   'alt-meta-down': 'split-down'
   'meta-[': 'outdent-selected-rows'
   'meta-]': 'indent-selected-rows'
+  'meta-{': 'show-previous-buffer'
   'meta-}': 'show-next-buffer'