Super simple and quite ugly sync tool foor bitburner.

up.php

<?php
/*
Super simple and quite ugly sync tool foor bitburner.
- At start it uploads all file in current directory to game
- after that it compares MD5 of files and sleeps for a second

Usage:
- Update YOUR_AUTHENTICATOIN_TOKEN_HERE down below
- run "php up.php"

*/

die("This will overwrite any files in your game. If you know, what you're doing, then delete this line!");

function uploadToBitburner($filename)
{
    // Sanitize filename for ingame (thx to https://www.npmjs.com/package/bitburner-sync)
    $ingameFilename = str_replace(getcwd(), "", $filename);
    $ingameFilename = strchr($ingameFilename, "/") !== false ? "/" . $ingameFilename : $ingameFilename;

    // Upload file
    $fields = [
        'filename' => $ingameFilename,
        'code' => base64_encode(file_get_contents($filename)),
    ];
    $postdata = json_encode($fields);

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'http://localhost:9990/');
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $headers = array(
       "Authorization: Bearer YOUR_AUTHENTICATOIN_TOKEN_HERE",
       "Content-Type: application/json",
    );
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    $result = curl_exec($ch);

    // No real error handling. just happy wehen response is "written" :)
    echo ($result == "written" ? $ingameFilename . " uploaded" : $result) . PHP_EOL;
}

// scan current directory (cwd) and ignore files that dont end with script|ns|js|txt
$directory = new RecursiveDirectoryIterator(getcwd());
$iterator = new RecursiveIteratorIterator($directory);
$regex = new RegexIterator($iterator, '/^.+\.(script|ns|js|txt)$/i', RecursiveRegexIterator::GET_MATCH);

// array to store md5 hashes
$files = array();

// file by file test if md5 has changed -> upload
while (true) {
    foreach ($regex as $key => $value) {
        $absoluteFilename = $value[0];
        if (
            !isset($files[$absoluteFilename]) ||
            ($files[$absoluteFilename] !== md5(file_get_contents($absoluteFilename)))
        ) {
            $files[$absoluteFilename] = md5(file_get_contents($absoluteFilename));
            uploadToBitburner($absoluteFilename, getcwd());
        }
    }

    sleep(1);
}