coz-bud-loader/lib/require_bud.js

Bud loader for coz.

/**
 * Require a module.
 * @memberof module:coz-bud-loader/lib
 * @function requireBud
 * @param {Bud} bud - Bud to require.
 * @returns {Promise}
 */

'use strict'

const fs = require('fs')
const path = require('path')

/** @lends requireBud */
async function requireBud(buds) {
  buds = [].concat(buds || [])

  let results = []
  for (let bud of buds) {
    let src = bud.src || bud
    if (typeof src === 'object') {
      // Seems already required.
      results.push(bud)
      continue
    }
    let filename = path.resolve(src)
    let exists = await new Promise((resolve) =>
      fs.exists(filename, (exists) => resolve(exists))
    )
    let name = exists ? filename : src
    try {
      bud = require(name)
    } catch (catched) {
      throw new Error(`Failed to load ${name}: ${catched}`)
    }
    results.push(
      [].concat(bud).map((bud) => {
        bud.src = path.resolve(src)
        return bud
      })
    )
  }
  return results.reduce((a, b) => [].concat(a, b), [])
}

module.exports = requireBud