add horizontal rule extension

packages/extension-horizontal-rule/index.ts

@@ -0,0 +1,28 @@
+import { Node, nodeInputRule } from '@tiptap/core'
+
+declare module '@tiptap/core/src/Editor' {
+  interface Editor {
+    horizontalRule(): Editor,
+  }
+}
+
+export default new Node()
+  .name('horizontalRule')
+  .schema(() => ({
+    group: 'block',
+    parseDOM: [{ tag: 'hr' }],
+    toDOM: () => ['hr'],
+  }))
+  .commands(({ editor, type }) => ({
+    horizontalRule: next => () => {
+      const { state, view } = editor
+      const { dispatch } = view
+
+      dispatch(state.tr.replaceSelectionWith(type.create()))
+      next()
+    },
+  }))
+  .inputRules(({ type }) => [
+    nodeInputRule(/^(?:---|___\s|\*\*\*\s)$/, type),
+  ])
+  .create()