@microflash/rehype-starry-night/src/rehype-starry-night/plugins/line-ins-plugin.js

rehype plugin to highlight codeblocks with Starry Night

function pluginOptions(globalOptions) {
	return globalOptions?.metadata?.ins || [];
}

function plugin(globalOptions, lines) {
	const ins = pluginOptions(globalOptions);
	if (ins.length > 0) {
		ins.forEach(lineNumber => {
			if (lines.has(lineNumber)) {
				const line = lines.get(lineNumber);
				line.properties["data-line-added"] = "";
			}
		});
		globalOptions["lineMarkerGutterFactor"] = 1;
	}
}

export default {
	type: "line",
	plugin
}