modernirc/lib/util.js

IRC library for creating modern IRC bots

export function mergeDeep(target, ...sources) {
  if (!sources.length) {
    return target
  }
  const source = sources.shift()

  if (typeof source === 'object' && !Array.isArray(source) && typeof target === 'object' && !Array.isArray(target)) {
    Object.keys(source).forEach((key) => {
      if (typeof source[key] === 'object' && !Array.isArray(source[key])) {
        if (!target[key]) {
          Object.assign(target, { [key]: {} })
        }
        mergeDeep(target[key], source[key])
      } else {
        Object.assign(target, { [key]: source[key] })
      }
    })
  }

  return target
}

/**
 * Cuts a `source` string into an array of strings that are no longer than `length` characters.
 * @param source {string}
 * @param length {number}
 * @returns {string[]}
 */
export function cutStringLength(source, length = 510) {
  if (source.length <= length) {
    return [source]
  }

  const out = []
  let remainingLength = source.length
  let page = 0
  while (remainingLength > 0) {
    const cut = source.substring(page * length, (page + 1) * length)
    if (cut.length > 0) {
      out.push(cut)
      remainingLength -= cut.length
      page++
    } else {
      remainingLength = 0
    }
  }

  return out
}

export function oGet(source, path) {
  if (typeof source !== 'object') {
    return undefined
  }
  if (typeof path !== 'string') {
    return undefined
  }

  const parts = path.split('.')
  let key = parts[0]

  if (Array.isArray(source)) {
    key = parseInt(key, 10)
    if (isNaN(key)) {
      return undefined
    }
  }

  if (parts.length === 1) {
    return source[key]
  }
  if (typeof source[key] === 'undefined') {
    return undefined
  }
  if (typeof source[key] === 'object') {
    return oGet(source[key], parts.slice(1).join('.'))
  }

  return undefined
}