Add fold-all event to editor

src/app/editor.coffee

@@ -120,6 +120,7 @@ class Editor extends View
       'undo': @undo
       'redo': @redo
       'toggle-soft-wrap': @toggleSoftWrap
+      'fold-all': @foldAll
       'toggle-fold': @toggleFold
       'fold-selection': @foldSelection
       'unfold': => @unfoldRow(@getCursorBufferPosition().row)
@@ -805,6 +806,9 @@ class Editor extends View
     for cursor in @getCursors()
       do (cursor) -> cursor.resetCursorAnimation()
 
+  foldAll: ->
+    @renderer.foldAll()
+
   toggleFold: ->
     @renderer.toggleFoldAtBufferRow(@getCursorBufferPosition().row)
 

src/app/renderer.coffee

@@ -53,6 +53,13 @@ class Renderer
   bufferRowsForScreenRows: (startRow, endRow) ->
     @lineMap.bufferRowsForScreenRows(startRow, endRow)
 
+  foldAll: ->
+    for currentRow in [@buffer.getLastRow()..0]
+      [startRow, endRow] = @foldSuggester.rowRangeForFoldAtBufferRow(currentRow) ? []
+      continue unless startRow?
+
+      @createFold(startRow, endRow)
+
   toggleFoldAtBufferRow: (bufferRow) ->
     for currentRow in [bufferRow..0]
       [startRow, endRow] = @foldSuggester.rowRangeForFoldAtBufferRow(currentRow) ? []
@@ -65,7 +72,12 @@ class Renderer
 
       break
 
+  foldFor: (startRow, endRow) ->
+    _.find @activeFolds[startRow] ? [], (fold) ->
+      fold.startRow == startRow and fold.endRow == endRow
+
   createFold: (startRow, endRow) ->
+    return fold if fold = @foldFor(startRow, endRow)
     fold = new Fold(this, startRow, endRow)
     @registerFold(fold)