Node.js script allowing for remote MicroPython command execution

## mp.js
#!/usr/bin/env node

[scpt,pwd,host] = process.argv.slice(1);
cmd  = process.argv.slice(4).join(" ");
out  = 0;
last = "";

if (process.argv.length < 5) {
    console.log((require("path")).basename(scpt) + " pwd host cmd [...]");
    process.exit(1);
}

var ws = new (require('ws'))("ws://" + host + ":8266/");

ws.onopen = function () { ws.send(pwd + "\r\n" + cmd + "\r\n"); }

ws.onmessage = function (ev) {
    if ((last == "\r\n") && (ev.data == ">>> "))  { out = 0; ws.terminate(); }
    if (out == 2)                           { process.stdout.write(ev.data); }
    if (ev.data == "\r\nWebREPL connected\r\n>>> ")               { out = 1; }
    last = ev.data.slice(-2);
    if ((out == 1) && (last == "\r\n"))                           { out = 2; }
}