Small helper to write the most ugly shell scripts in JavaScript

simpleshell.js

import { exec } from 'child_process'
 
async function main() {
  let args = process.argv.slice(2)
  if (args.length !== 1) {
    console.log(firstWordRed('Error: missing argument, path to Git directory.'))
    console.log(firstWordRed('Warning: This script will reset the Git directory.'))
    process.exit(1)
  }
  try {
    let result = await $`dotnet --version`
    console.log('dotnet version:', result)
  } catch (e) {
    console.log(e)
    process.exit(1)
  }
}
 
function firstWordRed(str) {
  let FgColor = "\x1b[31m"
  let Reset = "\x1b[0m"
  let firstWord = str.split(' ')[0]
  let rest = str.split(' ').slice(1).join(' ')
  return `${FgColor}${firstWord}${Reset} ${rest}`
}
 
function firstWordGreen(str) {
  let FgColor = "\x1b[92m"
  let Reset = "\x1b[0m"
  let firstWord = str.split(' ')[0]
  let rest = str.split(' ').slice(1).join(' ')
  return `${FgColor}${firstWord}${Reset} ${rest}`
}
 
function $(strs, ...interp) {
  let arr = []
  strs.forEach((str, i) => {
    arr.push(str, interp[i])
  })
 
  const cmd = arr.join('')
  console.log('$', firstWordGreen(cmd))
  return new Promise(function (resolve, reject) {
    exec(cmd, (error, stdout, stderr) => {
      if (error) {
        reject(error)
        return
      }
      resolve(stdout.trim())
    })
  })
}
 
main()