add extendMarkRange command

packages/core/src/commands/extendMarkRange.ts

@@ -0,0 +1,23 @@
+import { TextSelection } from 'prosemirror-state'
+import { MarkType } from 'prosemirror-model'
+import { Command } from '../Editor'
+import getMarkType from '../utils/getMarkType'
+import getMarkRange from '../utils/getMarkRange'
+
+export default (typeOrName: string | MarkType): Command => ({ tr, state, dispatch }) => {
+  const type = getMarkType(typeOrName, state.schema)
+  const { doc, selection } = tr
+  const { $from, empty } = selection
+
+  if (empty && dispatch) {
+    const range = getMarkRange($from, type)
+
+    if (range) {
+      const newSelection = TextSelection.create(doc, range.from, range.to)
+
+      tr.setSelection(newSelection)
+    }
+  }
+
+  return true
+}