javascripts (js) utils

utils.js

const {
    map, mapKeys, mapValues, isObject, isEmpty, isArray, negate, cond,
    stubTrue, curry, includes, flow, identity
} = require('lodash/fp');

function hookStream(stream, callback, disableOriginal = false) {
    const originalWrite = stream.write

    stream.write = (function (write) {
        return function (string, encoding, fd) {
            if (!disableOriginal) {
                write.apply(stream, arguments)
            }
            callback(string, encoding, fd)
        }
    })(stream.write)

    return function () {
        stream.write = originalWrite
    }
}

function mkdirp(targetDir, { isRelativeToScript = false } = {}) {
  const sep = path.sep;
  const initDir = path.isAbsolute(targetDir) ? sep : '';
  const baseDir = isRelativeToScript ? __dirname : '.';

  targetDir.split(sep).reduce((parentDir, childDir) => {
    const curDir = path.resolve(baseDir, parentDir, childDir);
    try {
      fs.mkdirSync(curDir);
    } catch (err) {
      if (err.code !== 'EEXIST') {
        throw err;
      }
    }

    return curDir;
  }, initDir);
}

/********************
* lodash/fp complementary functions
********************/

const mapKeysDeep1 = curry(
  (cb, obj) => {
    if (Array.isArray(obj)) {
      return map(mapKeysDeep(cb), obj);
    } else if (isObject(obj)) {
      return mapValues(mapKeysDeep(cb), mapKeys(cb, obj))
    } else {
      return obj;
    }
  }
)

const mapKeysDeep2 = curry(
  (cb, obj) => cond([
    [isArray, map(mapKeysDeep(cb))],
    [isObject, flow([mapKeys(cb), mapValues(mapKeysDeep(cb))])],
    [stubTrue, identity]
  ])(obj)
)


const ifElse = curry(
  (conditionCb, onTrueCb, onFalseCb) => cond([
    [conditionCb, onTrueCb],
    [stubTrue, onFalseCb]
  ])
)

mapWithKey: map.convert({ cap: false }),

isNotEmpty: negate(isEmpty),

included: curry((collection, value) => includes(value, collection))