webhook to listen to trello tasks in a `Done` list

countTrelloTasks.js

'use strict'

let createStore = require('redux').createStore

let express = require('express')
let bodyParser = require('body-parser')

let fs = require('fs')

// --

const tasksDone = (state, action) => {
  if (!state) state = 0

  switch (action.type) {
  case 'INCREMENT':
    return state + 1
  case 'DECREMENT':
    return state - 1
  default:
    return state
  }
}

const safeRequire = (path) => {
  try {
    return require(path)
  } catch (e) {
    return
  }
}

const STATE_FILE = './state.json'

const loadStateJSON = () => safeRequire(STATE_FILE)
const saveStateJSON = state => fs.writeFileSync(STATE_FILE, JSON.stringify(state))

let store = createStore(tasksDone, loadStateJSON())

store.subscribe(() => console.log(store.getState()))
store.subscribe(() => saveStateJSON(store.getState()))

const isDone = list => list.name === 'Done'

const taskDone = () => store.dispatch({ type: 'INCREMENT' })
const taskUndone = () => store.dispatch({ type: 'DECREMENT' })

// --

let app = express()

app.use(bodyParser.json())

app.post('/', req => isDone(req.body.action.data.listAfter) ? taskDone() : taskUndone())

let server = app.listen(7000, () => {
  let host = server.address().address
  let port = server.address().port

  console.log('Example app listening at http://%s:%s', host, port)
})

npm install redux express body-parser

node index.js (with node 4 or higher - I tested it with node 5)