undo on delete

Author: VladaHarbour

packages/super-editor/src/core/commands/index.js

@@ -32,6 +32,7 @@ export * from './selectTextblockStart.js';
 export * from './selectTextblockEnd.js';
 export * from './insertContent.js';
 export * from './insertContentAt.js';
+export * from './undoInputRule.js';
 
 // Lists
 export * from './wrapInList.js';

packages/super-editor/src/core/commands/undoInputRule.js

@@ -0,0 +1,32 @@
+export const undoInputRule = () => ({ state, dispatch }) => {
+  const plugins = state.plugins;
+
+  for (let i = 0; i < plugins.length; i += 1) {
+    const plugin = plugins[i];
+    let undoable;
+    
+    // eslint-disable-next-line
+    if (plugin.spec.isInputRules && (undoable = plugin.getState(state))) {
+      if (dispatch) {
+        const tr = state.tr;
+        const toUndo = undoable.transform;
+
+        for (let j = toUndo.steps.length - 1; j >= 0; j -= 1) {
+          tr.step(toUndo.steps[j].invert(toUndo.docs[j]));
+        }
+
+        if (undoable.text) {
+          const marks = tr.doc.resolve(undoable.from).marks();
+
+          tr.replaceWith(undoable.from, undoable.to, state.schema.text(undoable.text, marks));
+        } else {
+          tr.delete(undoable.from, undoable.to);
+        }
+      }
+
+      return true;
+    }
+  }
+
+  return false;
+}

packages/super-editor/src/core/extensions/keymap.js

@@ -20,6 +20,7 @@ export const Keymap = Extension.create({
 
     const handleBackspace = () =>
       this.editor.commands.first(({ commands, tr }) => [
+        () => commands.undoInputRule(),
         () => {
           tr.setMeta('inputType', 'deleteContentBackward');
           return false;