cssnano-cli/cmd.js

A CLI for modular minifier cssnano.

#!/usr/bin/env node

'use strict';

var fs = require('fs');
var nano = require('cssnano');
var read = require('read-file-stdin');
var write = require('write-file-stdout');

var opts = require('minimist')(process.argv.slice(2), {
    alias: {
        h: 'help',
        s: 'sourcemap',
        v: 'version'
    },
    boolean: 's'
});

if (opts.version) {
    return console.log(
        'cssnano v' + require('cssnano/package.json').version,
        '(cli v' + require('./package.json').version + ')'
    );
}

var file = opts._[0];
var out  = opts._[1];

if (file === 'help' || opts.help) {
    return fs.createReadStream(__dirname + '/usage.txt')
        .pipe(process.stdout)
        .on('close', function () { process.exit(1); });
}

read(file, function (err, buf) {
    if (err) {
        throw err;
    }
    if (file) {
        opts.from = file;
    }
    if (out) {
        opts.to = out;
    }
    nano.process(String(buf), opts).then(function (result) {
        write(out, result.css);
        if (opts.map && opts.to) {
            fs.writeFile(opts.to + '.map', result.map.toString());
        }
    }).catch(function (err) {
        if (err.message && typeof err.showSourceCode === 'function') {
          console.error(err.message);
          console.error(err.showSourceCode());
        } else {
          console.error(err);
        }
        process.exit(1);
    });
});