menu.js
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menu.js
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	import { MenuItem } from "prosemirror-menu";
	import { buildMenuItems } from "prosemirror-example-setup";

	import { writeFreelySchema } from "./schema";

	function canInsert(state, nodeType, attrs) {
	let $from = state.selection.$from;
	for (let d = $from.depth; d >= 0; d--) {
	let index = $from.index(d);
	if ($from.node(d).canReplaceWith(index, index, nodeType, attrs))
	return true;
	}
	return false;
	}

	const ReadMoreItem = new MenuItem({
	label: "Read more",
	select: (state) => canInsert(state, writeFreelySchema.nodes.readmore),
	run(state, dispatch) {
	dispatch(
	state.tr.replaceSelectionWith(writeFreelySchema.nodes.readmore.create())
	);
	},
	});

	export const getMenu = () => {
	const menuContent = [
	...buildMenuItems(writeFreelySchema).fullMenu,
	[ReadMoreItem],
	];
	return menuContent;
	};