generate-svg.js

import fastGlob from 'fast-glob';
import {optimize} from 'svgo';
import {resolve, parse, dirname} from 'path';
import fs from 'fs';
import {fileURLToPath} from 'url';

const {readFile, writeFile, mkdir} = fs.promises;
const __dirname = dirname(fileURLToPath(import.meta.url));
const glob = (pattern) => fastGlob.sync(pattern, {cwd: resolve(__dirname), absolute: true});
const outputDir = resolve(__dirname, '../public/img/svg');

function exit(err) {
  if (err) console.error(err);
  process.exit(err ? 1 : 0);
}

async function processFile(file, {prefix, fullName} = {}) {
  let name;

  if (fullName) {
    name = fullName;
  } else {
    name = parse(file).name;
    if (prefix) name = `${prefix}-${name}`;
    if (prefix === 'octicon') name = name.replace(/-[0-9]+$/, ''); // chop of '-16' on octicons
  }

  const {data} = optimize(await readFile(file, 'utf8'), {
    plugins: [
      {name: 'preset-default'},
      {name: 'removeXMLNS'},
      {name: 'removeDimensions'},
      {name: 'prefixIds', params: {prefix: () => name}},
      {name: 'addClassesToSVGElement', params: {classNames: ['svg', name]}},
      {name: 'addAttributesToSVGElement', params: {attributes: [{'width': '16'}, {'height': '16'}, {'aria-hidden': 'true'}]}},
    ],
  });
  await writeFile(resolve(outputDir, `${name}.svg`), data);
}

function processFiles(pattern, opts) {
  return glob(pattern).map((file) => processFile(file, opts));
}

async function main() {
  try {
    await mkdir(outputDir);
  } catch {}

  await Promise.all([
    ...processFiles('../node_modules/@primer/octicons/build/svg/*-16.svg', {prefix: 'octicon'}),
    ...processFiles('../web_src/svg/*.svg'),
    ...processFiles('../public/img/gitea.svg', {fullName: 'gitea-gitea'}),
  ]);
}

main().then(exit).catch(exit);