text: // @file stylus.js
  const gulp = require('gulp');
  const gulpif = require('gulp-if');
  const plumber = require('gulp-plumber');
  const stylus = require('gulp-stylus');
  const concat = require('gulp-concat');
  const autoprefixer = require('gulp-autoprefixer');
  const cleancss = require('gulp-clean-css');
  const config = require('../config').stylus;
  
  gulp.task('stylus', function() {
    gulp.src(config.src)
        .pipe(plumber())
        .pipe(stylus())
        .pipe(concat(config.output))
        .pipe(autoprefixer(config.autoprefixer))
        .pipe(gulpif(config.minify, cleancss()))
        .pipe(gulp.dest(config.dest));
  });
  
  