Capture Script for Arduino

capture.js

#!/usr/bin/env node

let yargs = require("yargs")
let serial = require("serialport")
let fs = require("fs")
let { join } = require("path")
let glob = require("glob")

function getPorts() {
	let files = glob.sync("/dev/tty.usbmodem*")
	return files.map((file) => file.split("/dev/tty.usbmodem")[1])
}

let ports = getPorts()

function begin(outfile, portFile) {
	if (!portFile) {
		if (ports.length == 1) {
			portFile = ports[0]
		} else if (ports.length == 0) {
			console.error("No arduino found");
			return;
		} else {
			console.error(`Multiple serial ports found: ${ports}`)
			return;
		}
	}
	let port = new serial("/dev/tty.usbmodem" + portFile);
	let stream = fs.open(join(__dirname, outfile), "w+", (err, fd) => {
		if (err) {
			console.error(err)
			return;
		}
		port.on("data", (d) => {
			fs.write(fd, d.toString(), () => true)
		})
	})
}


yargs.usage("capture <cmd> [args]")
	.command("run [file]", "Start listening for data", (yargs) => {
		yargs.positional("file", {
			type: "string",
			default: "data.csv",
			describe: "the location for data storage"
		})
	}, (argv) => begin(argv.file, argv.port))
	.argv

package.json

{
  "name": "capture",
  "version": "0.1.0",
  "description": "",
  "main": "capture.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "glob": "^7.1.2",
    "serialport": "^6.0.4",
    "yargs": "^10.0.3"
  }
}