@freearhey/chronos/index.js

Node.js CLI tool for running scripts on a schedule

#!/usr/bin/env node

import { parseArgsStringToArgv } from 'string-argv'
import { spawn } from 'node:child_process'
import { Command } from 'commander'
import cron from 'node-cron'

const program = new Command()

program
  .requiredOption('-e, --execute <command>', 'command to be executed')
  .requiredOption('-p, --pattern <pattern>', 'cron pattern')
  .option('-l, --log', 'enable console log')
  .parse(process.argv)

const options = program.opts()

let args = parseArgsStringToArgv(options.execute)
const cmd = args.shift()
let child

if (options.log) process.stdout.write(`started...\r\n`)

cron.schedule(options.pattern, () => run(cmd, args)).start()

function run(cmd, args) {
  if (child) child.kill('SIGINT')
  if (options.log) process.stdout.write(`[${options.pattern}] ${new Date().toJSON()}`)

  child = spawn(cmd, args)
  child.stdout.pipe(process.stdout)
  child.stderr.pipe(process.stderr)

  child.on('close', () => {
    child = undefined
  })
}