gulpfile.js

var gulp = require('gulp')
var premailer = require('gulp-premailer')
var rev = require('gulp-rev')
var revCollector = require('gulp-rev-collector')
var htmlmin = require('gulp-htmlmin')
var del = require('del')

gulp.task('clean', function(cb) {
  return del(['build'])
})

gulp.task('postclean', ['clean', 'html', 'assets', 'rev'], function(cb) {
  return del(['build/assets/rev-manifest.json'])
})

gulp.task('assets', ['clean'], function() {
  return gulp.src(['assets/**/*', '!assets/**/*.css'])
    .pipe(rev())
    .pipe(gulp.dest('build/assets'))
    .pipe(rev.manifest())
    .pipe(gulp.dest('build/assets'))
})

gulp.task('rev', ['clean', 'html', 'assets'], function() {
  return gulp.src(['build/assets/*.json', 'build/*.html'])
    .pipe(revCollector({
      dirReplacements: {
        assets: 'https://serve.gamekeller.net/email/'
      }
    }))
    .pipe(gulp.dest('build'))
})

gulp.task('html', ['clean'], function() {
  return gulp.src('*.html')
    .pipe(premailer())
    .pipe(htmlmin({
      collapseWhitespace: true,
      minifyCSS: true
    }))
    .pipe(gulp.dest('build'))
})

gulp.task('txt', ['clean'], function() {
  return gulp.src('*.txt')
    .pipe(gulp.dest('build'))
})

gulp.task('build', ['html', 'txt', 'assets', 'rev', 'postclean'])

gulp.task('default', ['build'])