Add fold gutters

browser/components/CodeEditor.js

@@ -109,8 +109,13 @@ export default class CodeEditor extends React.Component {
       scrollPastEnd: this.props.scrollPastEnd,
       inputStyle: 'textarea',
       dragDrop: false,
+      foldGutter: true,
+      gutters: ['CodeMirror-linenumbers', 'CodeMirror-foldgutter'],
       autoCloseBrackets: true,
       extraKeys: {
+        'Ctrl-G': function (cm) {
+          cm.foldCode(cm.getCursor())
+        },
         Tab: function (cm) {
           const cursor = cm.getCursor()
           const line = cm.getLine(cursor.line)

browser/main/global.styl

@@ -108,6 +108,22 @@ body[data-theme="dark"]
   background #B1D7FE
 ::selection
   background #B1D7FE
+.CodeMirror-foldmarker
+  font-family: arial
+
+.CodeMirror-foldgutter
+  width: .7em
+
+//.CodeMirror-foldgutter-open,
+//.CodeMirror-foldgutter-folded
+//  color: #555
+//  cursor: pointer
+
+.CodeMirror-foldgutter-open:after
+  content: "\25BE"
+
+.CodeMirror-foldgutter-folded:after
+  content: "\25B8"
 
 .sortableItemHelper
   z-index modalZIndex + 5

lib/main.html

@@ -92,6 +92,11 @@
   <script src="../node_modules/codemirror/addon/scroll/scrollpastend.js"></script>
   <script src="../node_modules/codemirror/addon/search/matchesonscrollbar.js"></script>
   <script src="../node_modules/codemirror/addon/search/jump-to-line.js"></script>
+
+  <script src="../node_modules/codemirror/addon/fold/brace-fold.js"></script>
+  <script src="../node_modules/codemirror/addon/fold/foldgutter.js"></script>
+  <script src="../node_modules/codemirror/addon/fold/foldcode.js"></script>
+
   <script src="../node_modules/codemirror/addon/dialog/dialog.js"></script>
   <script src="../node_modules/codemirror/addon/display/rulers.js"></script>