choop: generate a build of choo with preact instead of nanomorph

choop.js

var fs = require('fs')
var path = require('path')
var r2 = require('r2')
var x = require('xtend')
var packageJson = require('package-json')
var latestVersion = require('latest-version')
var prettyjson = require('json-format')

var raw = {
  choo: 'https://raw.githubusercontent.com/choojs/choo/master/index.js'
}

// makechoop()
makePackage()

async function makechoop () {
  var choosrc = await r2(raw.choo).text

  // nanomorph -> preact
  choosrc = choosrc.replace(`var nanomorph = require('nanomorph')`, `var preact = require('preact')\nvar rendertostring = require('preact-render-to-string').render`)

  // tree reference
  choosrc = choosrc.replace(`this._tree = null`, `this._tree = null\n\tthis._treeref = null`)

  // nanomorph() -> preact.render()
  choosrc = choosrc.replace(`nanomorph(self._tree, newTree)`, `self._treeref = preact.render(newTree, self._tree, self._treeref)`)
  choosrc = choosrc.replace(`nanomorph(self._tree, newTree)`, `self._treeref = preact.render(newTree, self._tree, self._tree.lastChild)`)

  // render to string
  choosrc = choosrc.replace(`html.toString()`, `rendertostring(html)`)

  // remove tree nodeName assets
  choosrc = choosrc.replace(`assert.equal(self._tree.nodeName, newTree.nodeName, 'choo.render: The target node <' +
      self._tree.nodeName.toLowerCase() + '> is not the same type as the new node <' +
      newTree.nodeName.toLowerCase() + '>.')`, '')
  choosrc = choosrc.replace(`assert.equal(self._tree.nodeName, newTree.nodeName, 'choo.mount: The target node <' +
      self._tree.nodeName.toLowerCase() + '> is not the same type as the new node <' +
      newTree.nodeName.toLowerCase() + '>.')`, '')

  // write files
  fs.writeFileSync(path.join(__dirname, '../index.js'), choosrc)
  fs.writeFileSync(path.join(__dirname, '../html.js'), `var h = require('preact').h
var hyperx = require('hyperx')
module.exports = hyperx(h)\n`)
  fs.writeFileSync(path.join(__dirname, '../h.js'), `module.exports = require('preact').h\n`)
  fs.writeFileSync(path.join(__dirname, '../component.js'), `function Component () {}
Component.prototype = Object.create(require('preact').Component.prototype)
module.exports = Component\n`)
}

async function makePackage () {
  var packages = {
    choo: await packageJson('choo')
  }

  var newdeps = {
    preact: '^' + await latestVersion('preact'),
    hyperx: '^' + await latestVersion('hyperx'),
    'preact-render-to-string': '^' + await latestVersion('preact-render-to-string')
  }

  var newdevdeps = {
    'babel-plugin-transform-object-rest-spread': '^' + await latestVersion('babel-plugin-transform-object-rest-spread'),
    'babel-plugin-transform-class-properties': '^' + await latestVersion('babel-plugin-transform-class-properties'),
    'babel-plugin-transform-react-jsx': '^' + await latestVersion('babel-plugin-transform-react-jsx'),
    'babel-preset-es2015': '^' + await latestVersion('babel-preset-es2015'),
    'babel-preset-stage-0': '^' + await latestVersion('babel-preset-stage-0'),
  }

  var deps = packages.choo.dependencies
  delete deps['nanomorph']
  delete deps['bel']
  deps = x(newdeps, deps)

  var devdeps = packages.choo.devDependencies
  devdeps = x(newdevdeps, devdeps)

  console.log(packages.choo.version)
  console.log('\n')
  console.log(prettyjson(deps))
  console.log('\n')
  console.log(prettyjson(devdeps))
}