utils.js

const { spawn } = require('node:child_process')
const { join } = require('node:path')
const touch = require('touch')

const { control } = require('../lib/clear.cjs')

const bin = join(__dirname, '..', 'lib', 'entrypoint')
const dir = join(__dirname, 'fixture')

const reClear = new RegExp(control)

const noop = () => {/**/ }

exports.spawn = (cmd, cb = noop) => {
    const ps = spawn('node', [bin].concat(cmd.split(' ')), { cwd: dir })
    let err = ''

    function errorHandler(data) {
        err += data.toString()
        outHandler(data)
    }

    function exitHandler(code, signal) {
        if (err) cb(err, code, signal)
    }

    function outHandler(data) {
        // Don't log clear
        console.log(data.toString().replace(reClear, ''))

        const ret = cb.call(ps, data.toString())

        if (typeof ret === 'function') {
            // use the returned function as new callback
            cb = ret
        } else if (ret && ret.exit) {
            // kill the process and invoke the given function
            ps.removeListener('exit', exitHandler)
            ps.once('exit', code => {
                ps.stdout.removeListener('data', outHandler)
                ps.stderr.removeListener('data', errorHandler)
                ret.exit(code)
            })
            ps.kill('SIGTERM')
        }
    }

    ps.stderr.on('data', errorHandler)
    ps.once('exit', exitHandler)
    ps.stdout.on('data', outHandler)

    return ps
}

// filewatcher requires a new mtime to trigger a change event
// but most file systems only have second precision, so wait
// one full second before touching.

exports.touchFile = (...filepath) => {
    setTimeout(() => touch(join(dir, ...filepath)), 1000)
}