hygen/src/prompt.ts

import path from 'path'
import fs from 'fs'
import { Prompter } from './types'

const hooksfiles = ['prompt.js', 'index.js']
const prompt = <Q, T>(
  createPrompter: () => Prompter<Q, T>,
  actionfolder: string,
  args: Record<string, any>,
): Promise<T | object> => {
  const hooksfile = hooksfiles
    .map(f => path.resolve(path.join(actionfolder, f)))
    .find(f => fs.existsSync(f))

  if (!hooksfile) {
    return Promise.resolve({})
  }

  // shortcircuit without prompter
  // $FlowFixMe
  const hooksModule = require(hooksfile)
  if (hooksModule.params) {
    return hooksModule.params({ args })
  }

  // lazy loads prompter
  // everything below requires it
  const prompter = createPrompter()
  if (hooksModule.prompt) {
    return hooksModule.prompt({ prompter, inquirer: prompter, args })
  }

  return prompter.prompt(
    // prompt _only_ for things we've not seen on the CLI
    hooksModule.filter(
      p =>
        args[p.name] === undefined ||
        args[p.name] === null ||
        args[p.name].length === 0,
    ),
  )
}

export default prompt