EDID Registry Key polling monitor.js

const path = require('path');
const { exec } = require('child_process');

// https://www.nirsoft.net/utils/dump_edid.html
const exe = path.resolve(__dirname, "bin", "DumpEDID.exe");
const regex = /\*{65}([^\*]+)\*{65}/gm;

var _displays = [];
var _first = true;


function parse(info) {
	var d = {};
	d.active = /Active\s+:([^\n]+)/.exec(info)[1].trim()=="Yes";
	d.serial = /Serial Number\s+:([^\n]+)/.exec(info)[1].trim();
	d.name = /Monitor Name\s+:([^\n]+)/.exec(info)[1].trim();
	d.key = /Registry Key\s+:([^\n]+)/.exec(info)[1].trim();
	return d;
}

async function poll() {
	return new Promise((resolve, reject) => {
		exec(exe, function (error, stdout, stderr) {
			if (error) {
				return reject(error);
			}
			
			const results = stdout.matchAll(regex);
			const displays = [];
			for(var d of results) {
				displays.push(parse(d[1]))
			}
			resolve(displays);
		});
	});
}

async function loop() {
	if(_first) {
		_displays = await poll();
		console.log(`Monitoring ${_displays.length} registry keys`);
		_first = false;
		return;
	}

	const results = await poll();

	for(const d of results) {
		const found = _displays.find(ele => { return ele.key==d.key });

		if(found==undefined) {
			console.log(`New registry key found: ${d.name}`);
		}
		else if(found.active != d.active) {
			console.log(`Active Changed: ${d.name} ${d.active}`);
		}
	}

	_displays = results;
}

setInterval(loop, 1000);