cssnextgen

#!/usr/bin/env node
/*! 
 * CSS: The Next Generation
 * 
 * Copyright (c) 2017 Atelier Disko. All rights reserved. This source 
 * code is distributed under the terms of the BSD 3-Clause License.
 */

const fs = require('fs');
const postcss = require('postcss');
const atImport = require('postcss-import');
const autoprefixer = require('autoprefixer');
const customProperties = require('postcss-custom-properties');
const flexbugs = require('postcss-flexbugs-fixes');
const url = require('postcss-url');
const matches = require('postcss-selector-matches');

const source = process.argv.pop();

fs.readFile(source, (err, css) => {
  postcss([
    atImport,
    url,
    matches,
    customProperties({preserve: false, warnings: true}),
    flexbugs,
    autoprefixer()
  ])
    .process(css, {
	    from: source
    })
    .then(result => {
      process.stdout.write(result.css);

      result.warnings().forEach(function (warn) {
          console.warn(warn.toString());
      });
    })
    .catch(error => {
	  console.error(error);
	  process.exit(1);
    });
});