meta-{ goes to previous buffer

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'