Arch-Node-JS-LemonBar/main.js

// Required Modules
var lemonBar = require("lemonbar");
var wifi = require('node-wifi');
const monitor = require('node-active-window');
var address = require('network-address')
const jsonfile = require('jsonfile')
const battery = require("battery");
const fs = require('fs');
const os = require('os');
const date = require('date-and-time');
var free = require('freem');
const checkDiskSpace = require('check-disk-space').default

let font = "Roboto Medium"

function cpuUsage(cb, core, sampleMs) {
    var deltaUsed;
    var deltaIdle;
    var timesKeys = ["user", "nice", "sys", "irq"];

    var allCores = null === core || !(core > -1);

    var byCore = (cpu, i) => allCores || core === i;

    var bySampleKey = (sample, key) => sample.filter(byCore).reduce((sum, cpu) => sum + cpu.times[key], 0);

    var sample0 = os.cpus();

    setTimeout(function () {
        var sample1 = os.cpus();

        deltaUsed = timesKeys.reduce(
            (diff, key) => diff + bySampleKey(sample1, key) - bySampleKey(sample0, key), 0);

        deltaIdle = bySampleKey(sample1, "idle") - bySampleKey(sample0, "idle");

        if ("function" === typeof cb) {
            cb(100 * (deltaUsed / (deltaUsed + deltaIdle)));
        }
    }, sampleMs || 1000);
}


function formatBytes(bytes, decimals = 2) {
    if (bytes === 0) return '0 Bytes';

    const k = 1024;
    const dm = decimals < 0 ? 0 : decimals;
    const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

    const i = Math.floor(Math.log(bytes) / Math.log(k));

    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
}

const file = '/home/raven/Documents/cache.json'

// Launching Main PID for LemonBar
lemonBar.launch({
    lemonbar: "/usr/bin/lemonbar",         // Lemonbar binary
    shell: "/bin/sh",                      // Shell to use for actions
    shelloutput: true,                     // Print shell STDOUT

    background: "#000",                    // Background color (#rgb, #rrggbb, #aarrggbb)
    foreground: "#000",                    // Foreground color
    lineWidth: 1, lineColor: "#666",
    fonts: ["Roboto Medium", "Roboto Medium"],     // Underline/Overline config
    geometry: {                            // Window geometry
        x: 0, y: 0,
        width: null, height: 25
    },

    bottom: false,                         // Dock bar at bottom instead of top
    forceDocking: false,                   // Force docking without asking the window manager
    name: "Linux",                            // Set the WM_NAME atom value for the bar
    areas: 10                              // Number of clickable areas

})

// This must be async for battery level and charging detection
async function update() {
    const now = new Date();
    const pattern = date.compile('ddd, DD MMM YYYY');

    // The cache file
    const { level, charging } = await battery();

    // Lets check our cache files mtime to see if we need to check the current SSID yet
    fs.stat(file, function (err, stats) {
        let seconds = (new Date().getTime() - stats.mtime) / 1000;
        // If the mtime for the cache is over 1 hour, lets poll for a new SSID
        if (seconds > 3600) {

            // Init the card
            wifi.init({
                iface: null // network interface, choose a random wifi interface if set to null
            });

            // Grab the current Wifi SSID and details 
            wifi.getCurrentConnections((error, currentConnections) => {
                if (error) {
                    console.log(error);
                } else {
                    // If no error, write the result to the cache
                    const obj = { ssid: currentConnections[0].ssid }

                    jsonfile.writeFile(file, obj, function (err) {
                        if (err) console.error(err)
                        console.log("WifiCache Is Written")
                    })
                }
            })
        }

        checkDiskSpace('/').then((diskSpace) => {
            free.m(function (err, freeRamMB) {
                cpuUsage(perc => lemonBar.append(lemonBar.left + require("os").userInfo().username.lbFg("#fff") + " | CPU: ".lbFg("#fff") + (Math.round(perc * 100) / 100).toFixed(2).lbFg("#fff") + " | Mem: ".lbFg("#fff") + freeRamMB[0].free.lbFg("#fff") + " MB".lbFg("#fff") + " | ".lbFg("#fff") + formatBytes(diskSpace.free).toString().lbFg("#fff")));
            });
        })
        
        // Check the cache SSID
        jsonfile.readFile(file, function (err, obj) {
            if (err) console.error(err)
            // Set a new var containing the ID
            let wifiSSID = obj.ssid

            // If charging show its status, else, show nothing for charging
            if (charging) {
                lemonBar.append(lemonBar.right +
                     (date.format(now, 'hh:mm:ss').toString.lbFg("#fff") +
                      " | ".lbFg("#fff") + date.format(now, pattern).toString().lbFg("#fff") +
                      " | BAT: ".lbFg("#fff") +
                      level.toString().lbFg("#fff") + " (Charging)".lbFg("#fff") 
                       + " " + "| WIFI: ".lbFg("#fff") + wifiSSID.ssid.lbFg("#fff") 
                       + " | IP: ".lbFg("#fff") 
                       + address().lbFg("#fff")).lbSwap)
            } else {

                lemonBar.append(lemonBar.right + (date.format(now, 'hh:mm:ss').toString().lbFont(font).lbFg("#fff") + " | ".lbFg("#fff") + date.format(now, pattern).toString().lbFg("#fff") + " | BAT: ".lbFg("#fff") + level.toString().lbFg("#fff") + " " + "| WIFI: ".lbFg("#fff") + wifiSSID.toString().lbFg("#fff") + " | IP: ".lbFg("#fff") + address().lbFg("#fff")).lbSwap)
            }

            monitor.getActiveWindow((err, window) => {
                if (!err) {
                    lemonBar.append((lemonBar.center + window.app.lbFg("#fff")))

                } else
                    console.log(err)
            });      // Grab the active window and and page name

            // Write the data to lemonbar
            lemonBar.write()

        })
    })
}

update()

// Update current time every second
setTimeout(function () {
    update()
    setInterval(update, 1200)
}, 1200 - new Date().getMilliseconds())