var gulp = require('gulp-runtime').create();

gulp.task('default', ['--tasks', '--version']);

var gulp = require('gulp-runtime').create();

gulp.task('build :src :dest', function () {
  return gulp.src(this.params.src)
    // transform, compress, etc.
    .pipe(gulp.dest(this.params.dest));
});

gulp.task('default',
  gulp.parallel('build src/**/*.js build')
);

var gulp = require('gulp-runtime').create();

gulp.task('read src', function (callback, src, dest) {
  dest = path.join(dest, new Date().toISOString());
  console.log('from', src, 'to', dest);

  var stream = gulp.src(src);

  callback(null, stream, dest);
});

gulp.task('write', function (done, stream, dest) {
  return stream.pipe(gulp.dest(dest));
});

// the default takes any arguments after '--' from the terminal
gulp.task('default',
  gulp.series('read src', 'write')
);

node gulplfile.js -- src/**/*.js build

var gulp = require('gulp-runtime').create();

function build (done, src, dest) {
  console.log('from', src, 'to', dest);
  return gulp.src(src)
    // some build step
    .pipe(gulp.dest(dest));
}

function minify (done, src, dest) {
  return gulp.src(src)
    // minify
    .pipe(gulp.dest(dest));
}

gulp.task('default',
  gulp.series(build, minify)
);

var styles = require('gulp-runtime').create();

styles.task('less', function (done, sources, dest) {
  var less = require('gulp-less');
  var options = require('./build/options');

  return gulp.src(sources)
    .pipe(less(options.less))
    .pipe(gulp.dest(dest));
});

styles.task('default', ['less']);

exports = module.exports = styles;

var gulp = require('gulp-runtime').create({ repl: true });

gulp.task(':number', function (done) {
  setTimeout(done, 100);
});

gulp.task('default', ['one', 'two']);