prettier/scripts/build/build.js

"use strict";

const chalk = require("chalk");
const execa = require("execa");
const minimist = require("minimist");
const path = require("path");
const stringWidth = require("string-width");

const bundler = require("./bundler");
const bundleConfigs = require("./config");
const util = require("./util");
const Cache = require("./cache");

// Errors in promises should be fatal.
const loggedErrors = new Set();
process.on("unhandledRejection", err => {
  // No need to print it twice.
  if (!loggedErrors.has(err)) {
    console.error(err);
  }
  process.exit(1);
});

const CACHED = chalk.bgYellow.black(" CACHED ");
const OK = chalk.bgGreen.black("  DONE  ");
const FAIL = chalk.bgRed.black("  FAIL  ");

function fitTerminal(input) {
  const columns = Math.min(process.stdout.columns || 40, 80);
  const WIDTH = columns - stringWidth(OK) + 1;
  if (input.length < WIDTH) {
    input += Array(WIDTH - input.length).join(chalk.dim("."));
  }
  return input;
}

async function createBundle(bundleConfig, cache) {
  const { output } = bundleConfig;
  process.stdout.write(fitTerminal(output));

  return bundler(bundleConfig, cache)
    .catch(error => {
      console.log(FAIL + "\n");
      handleError(error);
    })
    .then(result => {
      if (result.cached) {
        console.log(CACHED);
      } else {
        console.log(OK);
      }
    });
}

function handleError(error) {
  loggedErrors.add(error);
  console.error(error);
  throw error;
}

async function cacheFiles() {
  // Copy built files to .cache
  try {
    await execa("rm", ["-rf", path.join(".cache", "files")]);
    await execa("mkdir", ["-p", path.join(".cache", "files")]);
    for (const bundleConfig of bundleConfigs) {
      await execa("cp", [
        path.join("dist", bundleConfig.output),
        path.join(".cache", "files")
      ]);
    }
  } catch (err) {
    // Don't fail the build
  }
}

async function preparePackage() {
  const pkg = await util.readJson("package.json");
  pkg.bin = "./bin-prettier.js";
  pkg.engines.node = ">=4";
  delete pkg.dependencies;
  delete pkg.devDependencies;
  pkg.scripts = {
    prepublishOnly:
      "node -e \"assert.equal(require('.').version, require('..').version)\""
  };
  pkg.files = ["*.js"];
  await util.writeJson("dist/package.json", pkg);

  await util.copyFile("./README.md", "./dist/README.md");
  await util.copyFile("./LICENSE", "./dist/LICENSE");
}

async function run(params) {
  await execa("rm", ["-rf", "dist"]);
  await execa("mkdir", ["-p", "dist"]);

  if (params["purge-cache"]) {
    await execa("rm", ["-rf", ".cache"]);
  }

  const bundleCache = new Cache(".cache/", "v16");
  await bundleCache.load();

  console.log(chalk.inverse(" Building packages "));
  for (const bundleConfig of bundleConfigs) {
    await createBundle(bundleConfig, bundleCache);
  }

  await bundleCache.save();
  await cacheFiles();

  await preparePackage();
}

run(
  minimist(process.argv.slice(2), {
    boolean: ["purge-cache"]
  })
);