twitch-plays-plotter/app.js

const { SerialPort } = require('serialport')
const express = require('express')
const app = express()
const { init, translate, circle, rectangle, to, label } = require("./hpgl.js");
const tmi = require('tmi.js');

const client = new tmi.Client({
    channels: ['twitchplaysplotter']
});

client.connect();

const port = new SerialPort({
    path: '/dev/ttyUSB0',
    baudRate: 9600,
})

const toPlotter = (message) => {
    console.log("i will write to plotter ", message);

    port.write(message, function (err) {
        if (err) {
            return console.log('Error on write: ', err.message)
        }
        console.log('message written: ', message)
    })
}

// Open errors will be emitted as an error event
port.on('error', function (err) {
    console.log('Error: ', err.message)
})

port.on("open", function () {
    console.log('open');
    port.on('data', function (data) {
        console.log(data);
    });
});


// GET /text?message={message}
app.post('/text', (req, res) => {
    toPlotter(`SI0.5,0.8;LB${req.query.message};`);
    res.send(`SI0.5,0.8;LB${req.query.message};`)
});

// GET /direct?message={message}
app.post('/direct', (req, res) => {
    toPlotter(`${req.query.message}`);
    res.send(`${req.query.message}`)
});

app.use(express.static('public'))

app.listen(3000, () => {
    console.log(`Example app listening on port`)
})

client.on('message', (channel, tags, message, self) => {
    const distance = 3;

    console.log(`${tags['display-name']}: ${message}`);

    if (message.toLowerCase().startsWith("lb")) {
        var words = message.toLowerCase().replace("lb", "");
        toPlotter(label(words));
    } else {
        switch (message.toLowerCase()) {
            case 'init':
                toPlotter(`PU;`);
                break;
            case 'pu':
                toPlotter(`PU;`);
                break;
            case 'pd':
                toPlotter(`PD;`);
                break;
            case 'up':
                toPlotter(translate(distance * -1, 0));
                break;
            case 'down':
                toPlotter(translate(0, distance));
                break;
            case 'left':
                toPlotter(translate(distance * -1, 0));
                break;
            case 'right':
                toPlotter(translate(0, distance));
                break;
            case 'right':
                toPlotter(translate(0, distance));
                break;
            case 'rectangle':
                toPlotter(rectangle(distance));
                break;
            case 'circle':
                toPlotter(circle(distance));
                break;
            default:
                console.log("Message not recognized");
                break;
        }
    }
});