Add mirroring of "[", "]" and "="

editor/src/index.js

@@ -17,6 +17,10 @@ import '../node_modules/jquery-contextmenu/dist/jquery.contextMenu.css';
 
 moment.locale('nl')
 
+function isMultiline(input) {
+    return input.value.startsWith("```", 0)
+}
+
 function addSaver(editor, saveUrl, page, beforeSave) {
     return {
         save() {
@@ -272,6 +276,24 @@ if (holder) {
                     return false
                 }
 
+                let mirror = {
+                    '[': ']',
+                    '=': '=',
+                }
+
+                if (!isMultiline(input) && mirror.hasOwnProperty(event.key)) {
+                    let input = this
+                    let val = input.value
+                    let prefix = val.substring(0, input.selectionStart)
+                    let selection = val.substring(input.selectionStart, input.selectionEnd)
+                    let suffix = val.substring(input.selectionEnd)
+                    input.value = prefix + event.key + selection + mirror[event.key] + suffix
+                    input.selectionStart = prefix.length + event.key.length
+                    input.selectionEnd = input.selectionStart + selection.length
+                    $(input).trigger('input')
+                    return false;
+                }
+
                 return true
             })