const Koa = require('koa')
const path = require('path')
const Pug = require('koa-pug')

const app = new Koa()
const pug = new Pug({
  viewPath: path.resolve(__dirname, './views'),
  locals: { /* variables and helpers */ },
  basedir: 'path/for/pug/extends',
  helperPath: [
    'path/to/pug/helpers',
    { random: 'path/to/lib/random.js' },
    { _: require('lodash') }
  ],
  app: app // Binding `ctx.render()`, equals to pug.use(app)
})

pug.locals.someKey = 'some value'

app.use(async ctx => {
  await ctx.render('index', locals, true)
})

const koa = require('koa')
const Pug = require('koa-pug')

const app = koa()
const pug = new Pug({ app: app })

app.use(function * () {
  yield this.render('index', locals, true)
})

const pug = new Pug({
  viewPath: path.resolve(__dirname, './views'),
  locals: { /* variables and helpers */ },
  basedir: 'path/for/pug/extends',
  helperPath: [
    'path/to/pug/helpers',
    { random: 'path/to/lib/random.js' },
    { _: require('lodash') }
  ],
  // Can work with / without Koa
  // app: app
})

async function sendEmail(recipients, tplFile, locals) {
  const body = await pug.render(tplFile, locals)
  await send(recipients, body)
}

await ctx.render('index')
ctx.type = 'text/plain'

// format-date.js, `koa-pug` will convert filename to camel case and use it as module name
module.exports = function (input) {
  return (input.getMonth() + 1) + '/' + input.getDate() + '/' + input.getFullYear()
}

// Becasue of there is a `moduleName`, `koa-pug` will use it as module name instead of filename
module.exports = {
  moduleName: 'formatDate',
  moduleBody (input) {
    return (input.getMonth() + 1) + '/' + input.getDate() + '/' + input.getFullYear()
  }
}