hlwm-config/conky-bat/index.js

#!/usr/bin/env node
'use strict';

const linuxBattery = require('linux-battery');

async function run() {
    try {
        const batteries = await linuxBattery();
        batteries.forEach(battery => {
            if (battery.powerSupply === 'no') {
                return '';
            }

            const color = battery.warningLevel !== 'none' ? '#ff0000' : '#eee8d5';
            let stateSymbol = battery.state === 'charging' ? '↑' : '↓';
            switch (battery.state) {
                case 'charging':
                    stateSymbol = '↑';
                    break;
                case 'fully-charged':
                    stateSymbol = 'F';
                    break;
                case 'discharging':
                    stateSymbol = '↓';
                    break;
                default:

            }
            const timeLeft = battery.timeToFull || battery.timeToEmpty || '';

            const text = `%{F${color}}${battery.percentage} ${stateSymbol} ${timeLeft}%{F-}`;
            process.stdout.write(text);
        });
    } catch (error) {
        console.error(error);
    }
}

run();