es5-workshop/index.js

NodeSchool ES5 Workshop

#!/usr/bin/env node

"use strict"

var adventure = require('adventure');
var shop = adventure('es5-workshop');
var spawn = require('child_process').spawn
var pkg = require('./package.json')
var msee = require('msee')
var fs = require('fs')
var path = require('path')
var inquirer = require('inquirer')
var wordwrap = require('wordwrap')
var assert = require('assertf')

shop.on('pass', function() {
  console.log('Type `' + pkg.name+ '` to show the menu.\n')
})

var exercises = Object.keys(pkg.exercises).map(function(exerciseName) {
  var dir = pkg.exercises[exerciseName]
  var exercise = require(dir)
  exercise.name = exerciseName
  exercise.problemRaw = exercise.problem
  exercise.problem = formatProblem(exercise.problem)
  exercise.solutionRaw = exercise.solution
  exercise.solution = formatSolution(exercise.solution)
  exercise.dir = dir
  exercise.cleanName = clean(exercise.name)
  return exercise
})

exercises.forEach(function(exercise) {
  assert(exercise.name, 'exercise needs name')
  assert(exercise.problem, 'exercise %s needs problem', exercise.name)
  assert(exercise.solution, 'exercise %s needs solution', exercise.name)
  assert(exercise.boilerplate, 'exercise %s needs boilerplate', exercise.name)
  assert(exercise.run, 'exercise %s needs run', exercise.name)
  assert(exercise.verify, 'exercise %s needs verify', exercise.name)
})

exercises.forEach(function(exercise) {
  shop.add(exercise.name, function() {
    setTimeout(setup, 10)
    return exercise;
  })
})

function setup() {
  var boilerPlateRequired = exercises.filter(function(exercise) {
    return exercise.boilerplate
  }).filter(function(exercise) {
    return !fs.existsSync(process.cwd() + '/' + exercise.cleanName)
  }).map(function(exercise) {
    return {
      boilerplate: exercise.boilerplate,
      problem: exercise.problemRaw,
      dir: process.cwd() + '/' + exercise.cleanName
    }
  })

  if (boilerPlateRequired.length) {
    console.log('\n' + process.cwd() + '\n')
    inquirer.prompt([{
      'type': 'confirm',
      'name': 'ok',
      'default': true,
      'message': wordwrap(4, 80)(
        "We're about to populate the above directory with some files needed for the exercises." +
        "If they've already been created then don't worry, " +
        "they won't be replaced. Continue?"
      ).replace(/^\s+/, '')
    }], function(result) {
      if (!result.ok) return
      boilerPlateRequired.forEach(function(item) {
        try {
          fs.mkdirSync(item.dir)
        } catch(e) {
          // probably already exists
        }
        fs.writeFileSync(item.dir + '/Readme.md', item.problem)
        fs.writeFileSync(item.dir + '/index.js', item.boilerplate)
      })
    })
  }
}

module.exports = shop

if (!module.parent) shop.execute(process.argv.slice(2));

function formatProblem(md) {
  var out = '\n' + msee.parse(md, {
    paragraphStart: '',
    paragraphEnd: '\n\n'
  }).trimRight()
  return out
}

function formatSolution(solution) {
  return msee.parse([
    'Here\'s the official solution so you can compare notes:',
    '```js',
      solution,
    '```'
  ].join('\n'))
}

function clean(name) {
  return name.trim()
    .toLowerCase()
    .replace(/[^\w]+/gm, '-')
    .replace('/','-')
}