node-make/index.js

Task driven build tool.

'use strict'
const path = require('path')
const cwd = require('cwd')
const pathExists = require('path-exists')
const babel = require('babel-core')
const requireFromString = require('require-from-string')
const event = require('./lib/event')
const fs = require('./lib/built-in-fs')
require('shelljs/global')

class Make {
  constructor(cli) {
    global.cli = cli
    // get task name to run, task `default` by default
    const taskName = cli.input[0] || 'default'

    // get and parse makefile
    const configFile = cli.flags.config || 'makefile.js'
    const makefilePath = cwd(configFile)

    // change current working dir
    process.chdir(path.dirname(makefilePath))

    if (!pathExists.sync(makefilePath)) {
      return event.emit('makefile not found', makefilePath)
    }

    let makefileContent = fs.read(makefilePath, 'utf8')
    makefileContent = babel.transform(makefileContent, {
      presets: [require('babel-preset-es2015'), require('babel-preset-stage-0')],
      plugins: [require('babel-plugin-transform-runtime')]
    }).code
    makefileContent = requireFromString(makefileContent, {
      appendPaths: [path.join(__dirname, 'node_modules')]
    })
    this.addTasks(makefileContent)

    // run task by name
    const task = makefileContent[taskName]
    if (!task) {
      return event.emit('task not found', taskName)
    }
    this.runTask(taskName)
  }
  addTasks(tasks) {
    this.tasks = {}
    // built-in helpers
    const self = {
      fs,
      run: this.runTask.bind(this)
    }
    for (const name in tasks) {
      if (tasks[name]) {
        this.tasks[name] = tasks[name].bind(self)
      }
    }
  }
  runTask() {
    const tasks = [].slice.call(arguments)
    tasks.forEach(task => {
      event.emit('start task', task)
      this.tasks[task]()
      event.emit('done task', task)
    })
  }
}

module.exports = (cli) => new Make(cli)