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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// This file contains the implementation of a Github Action. Github uses// Node.js v12.x to run actions, so this is Node code and not Deno code.
const { spawn } = require("child_process");const { dirname, resolve } = require("path");const { StringDecoder } = require("string_decoder");const { promisify } = require("util");
const fs = require("fs");const utimes = promisify(fs.utimes);const mkdir = promisify(fs.mkdir);const readFile = promisify(fs.readFile);const writeFile = promisify(fs.writeFile);
process.on("unhandledRejection", abort);main().catch(abort);
async function main() {  const startTime = getTime();
  const checkCleanPromise = checkClean();
  const cacheFile = getCacheFile();  const oldCache = await loadCache(cacheFile);  const newCache = Object.create(null);
  await checkCleanPromise;
  const counters = {    restored: 0,    added: 0,    stale: 0,    invalid: 0,  };
  for await (const { key, path } of ls()) {    let mtime = oldCache[key];    if (mtime === undefined) {      mtime = startTime;      counters.added++;    } else if (!mtime || mtime > startTime) {      mtime = startTime;      counters.invalid++;    } else {      counters.restored++;    }
    await utimes(path, startTime, mtime);    newCache[key] = mtime;  }
  for (const key of Object.keys(oldCache)) {    if (!(key in newCache)) counters.stale++;  }
  await saveCache(cacheFile, newCache);
  const stats = {    ...counters,    "cache file": cacheFile,    "time spent": (getTime() - startTime).toFixed(3) + "s",  };  console.log(    [      "mtime cache statistics",      ...Object.entries(stats).map(([k, v]) => `* ${k}: ${v}`),    ].join("\n"),  );}
function abort(err) {  console.error(err);  process.exit(1);}
function getTime() {  return Date.now() / 1000;}
function getCacheFile() {  const cachePath = process.env["INPUT_CACHE-PATH"];  if (cachePath == null) {    throw new Error("required input 'cache_path' not provided");  }
  const cacheFile = resolve(cachePath, ".mtime-cache-db.json");  return cacheFile;}
async function loadCache(cacheFile) {  try {    const json = await readFile(cacheFile, { encoding: "utf8" });    return JSON.parse(json);  } catch (err) {    if (err.code !== "ENOENT") {      console.warn(`failed to load mtime cache from '${cacheFile}': ${err}`);    }    return Object.create(null);  }}
async function saveCache(cacheFile, cacheData) {  const cacheDir = dirname(cacheFile);  await mkdir(cacheDir, { recursive: true });
  const json = JSON.stringify(cacheData, null, 2);  await writeFile(cacheFile, json, { encoding: "utf8" });}
async function checkClean() {  let output = run(    "git",    [      "status",      "--porcelain=v1",      "--ignore-submodules=untracked",      "--untracked-files=no",    ],    { stdio: ["ignore", "pipe", "inherit"] },  );  output = decode(output, "utf8");  output = split(output, "\n");  output = filter(output, Boolean);  output = await collect(output);
  if (output.length > 0) {    throw new Error(      ["git work dir dirty", ...output.map((f) => `  ${f}`)].join("\n"),    );  }}
async function* ls(dir = "") {  let output = run(    "git",    ["-C", dir || ".", "ls-files", "--stage", "--eol", "--full-name", "-z"],    { stdio: ["ignore", "pipe", "inherit"] },  );  output = decode(output, "utf8");  output = split(output, "\0");  output = filter(output, Boolean);
  for await (const entry of output) {    const pat =      /^(?<mode>\d{6}) (?<hash>[0-9a-f]{40}) 0\t(?<eol>[^\t]*?)[ ]*\t(?<name>.*)$/;    const { mode, hash, eol, name } = pat.exec(entry).groups;    const path = dir ? `${dir}/${name}` : name;
    switch (mode) {      case "120000": // Symbolic link.        break;      case "160000": // Git submodule.        yield* ls(path);        break;      default: {        // Regular file.        const key = [mode, hash, eol, path].join("\0");        yield { key, path };      }    }  }}
async function* run(cmd, args, options) {  const child = spawn(cmd, args, options);
  const promise = new Promise((resolve, reject) => {    child.on("close", (code, signal) => {      if (code === 0 && signal === null) {        resolve();      } else {        const command = [cmd, ...args].join(" ");        const how = signal === null ? `exit code ${code}` : `signal ${signal}`;        const error = new Error(`Command '${command}' failed: ${how}`);        reject(error);      }    });    child.on("error", reject);  });
  yield* child.stdout;  await promise;}
async function collect(stream) {  const array = [];  for await (const item of stream) {    array.push(item);  }  return array;}
async function* decode(stream, encoding) {  const decoder = new StringDecoder(encoding);  for await (const chunk of stream) {    yield decoder.write(chunk);  }  yield decoder.end();}
async function* filter(stream, fn) {  for await (const item of stream) {    if (fn(item)) yield item;  }}
async function* split(stream, separator) {  let buf = "";  for await (const chunk of stream) {    const parts = (buf + chunk).split(separator);    buf = parts.pop();    yield* parts.values();  }  yield buf;}