Add fold-all event to editor

spec/app/editor-spec.coffee

@@ -2457,6 +2457,14 @@ describe "Editor", ->
         editor.trigger "toggle-fold"
         expect(editor.screenLineForRow(1).fold).toBeUndefined()
 
+    describe "when a fold-all event is triggered", ->
+      it "creates folds on every line that can be folded", ->
+        editor.setCursorBufferPosition([5,13])
+
+        editor.trigger "fold-all"
+        expect(editor.screenLineForRow(0).fold).toBeDefined()
+        expect(editor.screenLineForRow(1)).toBeUndefined()
+
   describe "primitive folding", ->
     beforeEach ->
       editor.setBuffer(new Buffer(require.resolve('fixtures/two-hundred.txt')))

spec/app/renderer-spec.coffee

@@ -157,6 +157,25 @@ describe "Renderer", ->
           expect(renderer.lineForRow(2).foldable).toBeTruthy()
           expect(renderer.lineForRow(3).foldable).toBeFalsy()
 
+    describe ".foldAll()", ->
+      it "folds every foldable line", ->
+        renderer.foldAll()
+        fold = renderer.lineForRow(0).fold
+        expect(fold).toBeDefined()
+        expect([fold.startRow, fold.endRow]).toEqual [0,12]
+
+        expect(Object.keys(renderer.activeFolds).length).toBe(3)
+        expect(renderer.activeFolds[1].length).toBe(1)
+        expect(renderer.activeFolds[4].length).toBe(1)
+
+      it "doesn't fold lines that are already folded", ->
+        renderer.toggleFoldAtBufferRow(4)
+        renderer.foldAll()
+        expect(Object.keys(renderer.activeFolds).length).toBe(3)
+        expect(renderer.activeFolds[0].length).toBe(1)
+        expect(renderer.activeFolds[1].length).toBe(1)
+        expect(renderer.activeFolds[4].length).toBe(1)
+
     describe ".toggleFoldAtBufferRow(bufferRow)", ->
       describe "when bufferRow can be folded", ->
         it "creates/destroys a fold based on the syntactic region starting at the given row", ->