utils.js

import terminal from 'term-size'
import { promisify } from 'util'
import fs from 'fs'
import childProcess from 'child_process'
import dot from 'dot-prop'

// Terminal

export const maxCellSize = () => terminal().columns / 4

// Yarn

const canAccessFile = promisify(fs.access)
const exec = promisify(childProcess.exec)

const isYarnInstalled = async () => {
  try {
    await exec(`yarnpkg --version`, { stdio: `ignore` })
    return true
  } catch (err) {
    return false
  }
}

export const shouldUseYarn = async () => {
  try {
    await canAccessFile('package-lock.json')
    return false
  } catch (err) {
    return isYarnInstalled()
  }
}

// Additional

export const notEmpty = x => x.length !== 0

export const isEmpty = x => x.length === 0

const getCellPadding = (hits, hit) => attr => {
  const cells = hits.map(_hit => dot.get(_hit, attr))

  const cellWidth = Math.max(...cells.map(cell => (cell ? cell.length : 0)))

  const cellValueWidth =
    dot.get(hit, attr) === null ? 0 : dot.get(hit, attr).length
  const width = cellWidth - cellValueWidth

  return ` `.repeat(width)
}

export const hitsToCells = hits =>
  hits.map(hit => ({
    ...hit,
    _cell: getCellPadding(hits, hit),
  }))