import { createFilter } from "@rollup/pluginutils";
import { Minifier } from "minify-html-stream";
import { Readable } from "stream";

function htmlMinifier(options) {
  const filter = createFilter(["**/*.svelte"], options.exclude);

  return {
    name: "htmlMinifier",
    async transform(code, id) {
      if (!filter(id)) return code;

      let stream = new Readable();
      stream.push(code);
      stream.push(null);
      stream = stream.pipe(new Minifier(options.options));

      const chunks = [];

      for await (let chunk of stream) {
        chunks.push(chunk);
      }

      const buffer = Buffer.concat(chunks);

      return buffer.toString("utf-8");
    },
  };
}

export default htmlMinifier;