resize.js

const sharp = require('sharp');
const path = require('path');
const fs = require('fs');
const readdirp = require('readdirp');
const imagemin = require('imagemin');
const imageminPngquant = require('imagemin-pngquant');
const yaml = require('yaml');

async function resize(file, size) {
  const newFile = file.replace('.png', `-${size}.png`);

  // skip files that are up to date
  if (fs.existsSync(newFile) && fs.statSync(newFile).mtime > fs.statSync(file).mtime) {
    return Promise.resolve(null);
  }

  return sharp(fs.readFileSync(file))
    .resize(size, size, { fit: 'inside' })
    .toFormat('png')
    .toBuffer()
    .then((buf) => imagemin.buffer(buf))
    .then((buf) => imagemin.buffer(buf, { use: [imageminPngquant()] }))
    .then((buf) => fs.writeFileSync(newFile, buf));
}

async function main() {
  const icons = [];
  for await (const entry of readdirp(path.join(__dirname, '../apps'))) {
    if (entry.basename.match(/icon\.png/)) {
      icons.push(entry.fullPath);
    }
  }

  console.log(`Resizing ${icons.length} icons...`);
  const resizes = icons.reduce((acc, icon) => {
    const iconName = path.basename(icon);

    // skip disabled app
    const yamlFile = path.join(icon.replace('-icon.png', '.yml'));
    const { disabled } = yaml.parse(fs.readFileSync(yamlFile, 'utf-8'));
    if (disabled) {
      return acc;
    }

    return {
      ...acc,
      [iconName]: [resize(icon, 32), resize(icon, 64), resize(icon, 128), resize(icon, 256)],
    };
  }, {});

  for (const icon in resizes) {
    const promises = await Promise.allSettled(Object.values(resizes[icon]));
    const failed = promises.filter((p) => p.status === 'rejected');

    if (failed.length > 0) {
      console.error(`🔴 Failed to resize icons for icon "${icon}"!`);
      for (const { reason } of failed) {
        console.log(reason);
      }
      process.exit(1);
    }
  }
}

main();