#!/usr/bin/env node
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const fs = require('fs');
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const prefersColorScheme = require('./postcss');
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if (process.argv.length < 3) {
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console.log([
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'Prefers Color Scheme\n',
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' Transforms CSS with @media (prefers-color-scheme) {}\n',
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'Usage:\n',
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' css-prefers-color-scheme source.css transformed.css',
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' css-prefers-color-scheme --in=source.css --out=transformed.css --opts={}',
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' echo "@media (prefers-color-scheme: dark) {}" | css-prefers-color-scheme\n'
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].join('\n'));
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process.exit(0);
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}
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// get process and plugin options from the command line
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const fileRegExp = /^[\w\/.]+$/;
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const argRegExp = /^--(\w+)=("|')?(.+)\2$/;
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const relaxedJsonRegExp = /(['"])?([a-z0-9A-Z_]+)(['"])?:/g;
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const argo = process.argv.slice(2).reduce(
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(object, arg) => {
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const argMatch = arg.match(argRegExp);
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const fileMatch = arg.match(fileRegExp);
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if (argMatch) {
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object[argMatch[1]] = argMatch[3];
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} else if (fileMatch) {
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if (object.from === '<stdin>') {
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object.from = arg;
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} else if (object.to === '<stdout>') {
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object.to = arg;
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}
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}
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return object;
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},
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{ from: '<stdin>', to: '<stdout>', opts: 'null' }
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);
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// get css from command line arguments or stdin
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(argo.from === '<stdin>' ? getStdin() : readFile(argo.from))
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.then(css => {
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const pluginOpts = JSON.parse(argo.opts.replace(relaxedJsonRegExp, '"$2": '));
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const processOptions = Object.assign({ from: argo.from, to: argo.to || argo.from }, argo.map ? { map: JSON.parse(argo.map) } : {});
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const result = prefersColorScheme.process(css, processOptions, pluginOpts);
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if (argo.to === '<stdout>') {
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return result.css;
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} else {
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return writeFile(argo.to, result.css).then(
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() => `CSS was written to "${argo.to}"`
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)
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}
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}).then(
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result => {
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console.log(result);
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process.exit(0);
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},
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error => {
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console.error(error);
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process.exit(1);
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}
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);
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function readFile(pathname) {
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return new Promise((resolve, reject) => {
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fs.readFile(pathname, 'utf8', (error, data) => {
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if (error) {
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reject(error);
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} else {
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resolve(data);
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}
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});
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});
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}
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function writeFile(pathname, data) {
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return new Promise((resolve, reject) => {
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fs.writeFile(pathname, data, (error, content) => {
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if (error) {
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reject(error);
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} else {
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resolve(content);
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}
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});
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});
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}
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function getStdin() {
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return new Promise(resolve => {
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let data = '';
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if (process.stdin.isTTY) {
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resolve(data);
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} else {
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process.stdin.setEncoding('utf8');
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process.stdin.on('readable', () => {
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let chunk;
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while (chunk = process.stdin.read()) {
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data += chunk;
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}
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});
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process.stdin.on('end', () => {
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resolve(data);
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});
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}
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});
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}
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