Meta-a selects everything

src/app/composite-selection.coffee

@@ -127,6 +127,9 @@ class CompositeSeleciton
   selectToTop: ->
     @expandSelectionsBackward (selection) => selection.selectToTop()
 
+  selectAll: ->
+    @expandSelectionsForward (selection) => selection.selectAll()
+
   selectToBottom: ->
     @expandSelectionsForward (selection) => selection.selectToBottom()
 

src/app/editor.coffee

@@ -140,6 +140,7 @@ class Editor extends View
       'select-to-beginning-of-line': @selectToBeginningOfLine
       'select-to-end-of-word': @selectToEndOfWord
       'select-to-beginning-of-word': @selectToBeginningOfWord
+      'select-all': @selectAll
 
     for name, method of editorBindings
       do (name, method) =>
@@ -588,6 +589,7 @@ class Editor extends View
   selectDown: -> @compositeSelection.selectDown()
   selectToTop: -> @compositeSelection.selectToTop()
   selectToBottom: -> @compositeSelection.selectToBottom()
+  selectAll: -> @compositeSelection.selectAll()
   selectToBeginningOfLine: -> @compositeSelection.selectToBeginningOfLine()
   selectToEndOfLine: -> @compositeSelection.selectToEndOfLine()
   selectToBeginningOfWord: -> @compositeSelection.selectToBeginningOfWord()

src/app/keymaps/editor.coffee

@@ -16,6 +16,7 @@ window.keymap.bindKeys '.editor',
   'shift-left': 'select-left'
   'shift-up': 'select-up'
   'shift-down': 'select-down'
+  'meta-a': 'select-all'
   enter: 'newline'
   tab: 'tab'
   backspace: 'backspace'

src/app/selection.coffee

@@ -206,6 +206,9 @@ class Selection extends View
   selectToBottom: ->
     @modifySelection => @cursor.moveToBottom()
 
+  selectAll: ->
+    @setBufferRange(@editor.buffer.getRange())
+
   selectToBeginningOfLine: ->
     @modifySelection => @cursor.moveToBeginningOfLine()