var gulp = require('gulp');
var middleware = require('gulp-middleware');

gulp.task('middleware', function() {
  return gulp.src('*.js')
    // function or array of functions
    .pipe(middleware(fns))
});

var fs = require('fs');
var File = require('vinyl');
var through = require('through2');
var middleware = require('gulp-middleware');

function toStream(path) {
  return fs.createReadStream(path)
    .pipe(through.obj(function(contents, enc, next) {
      next(null, new File({path, contents}));
    }))
}

toStream('README.md')
  .pipe(middleware(fn))
  .pipe(middleware([fn, fn, fn]))

function fn(file, next) {
  console.log(file);
  next();
}

var middleware = require('gulp-middleware');

gulp.task('middleware', function() {
  return gulp.src('*.js')
    .pipe(middleware(fn('bar')))
    .pipe(middleware([
      fn('foo'),
      fn('bar'),
      fn('baz')
    ]))
});

function fn(name) {
  return function(file, next) {
    console.log(name);
    next();
  };
}

var middleware = require('gulp-middleware');

gulp.task('middleware', function() {
  return gulp.src('*.js')
    .pipe(middleware(fn('bar')))
    .pipe(middleware.parallel([
      fn('foo'),
      fn('bar'),
      fn('baz')
    ]))
});

function fn(name) {
  return function(file, next) {
    console.log(name);
    next();
  };
}