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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { type Reader } from "../types.d.ts";import { BufReader } from "./buf_reader.ts";import { concat } from "../bytes/concat.ts";
/** * Read strings line-by-line from a Reader. * *  @example * ```ts * import { readLines } from "https://deno.land/std@$STD_VERSION/io/read_lines.ts"; * import * as path from "https://deno.land/std@$STD_VERSION/path/mod.ts"; * * const filename = path.join(Deno.cwd(), "std/io/README.md"); * let fileReader = await Deno.open(filename); * * for await (let line of readLines(fileReader)) { *   console.log(line); * } * ``` */export async function* readLines(  reader: Reader,  decoderOpts?: {    encoding?: string;    fatal?: boolean;    ignoreBOM?: boolean;  },): AsyncIterableIterator<string> {  const bufReader = new BufReader(reader);  let chunks: Uint8Array[] = [];  const decoder = new TextDecoder(decoderOpts?.encoding, decoderOpts);  while (true) {    const res = await bufReader.readLine();    if (!res) {      if (chunks.length > 0) {        yield decoder.decode(concat(...chunks));      }      break;    }    chunks.push(res.line);    if (!res.more) {      yield decoder.decode(concat(...chunks));      chunks = [];    }  }}