motion.js

"use strict"
const fs = require("fs")
const path = require("path")
const detectionDir = "./motion"
const detectionFile = "detected"
// Load in smart mirror config
var config = require("./config.json")

if (
	!config ||
	!config.motion ||
	!config.motion.enabled ||
	!config.motion.pin ||
	!config.general.language
) {
	console.log(
		"!E:",
		"Configuration Error! See: https://docs.smart-mirror.io/docs/configure_the_mirror.html#motion"
	)
}

if (
	config.motion.enabled == "pin" &&
	require.resolve("johnny-five").length > 0 &&
	require.resolve("raspi-io").length > 0
) {
	// Configure johnny-five
	var five = require("johnny-five")
	var Raspi = require("raspi-io").RaspiIO
	var board = new five.Board({
		io: new Raspi(),
	})

	board.on("ready", function () {
		var motion = new five.Motion(config.motion.pin)

		// "calibrated" occurs once, at the beginning of a session,
		motion.on("calibrated", function () {
			console.log("!c:", "calibrated")
			console.log("!e:", "motionend")
		})

		// "motionstart" events are fired when the "calibrated"
		// proximal area is disrupted, generally by some form of movement
		motion.on("motionstart", function () {
			console.log("!s:", "motionstart")
		})

		// "motionend" events are fired following a "motionstart" event
		// when no movement has occurred in X ms
		motion.on("motionend", function () {
			console.log("!e:", "motionend")
		})
	})
} else if (config.motion.enabled === "pin") {
	console.error(
		"!E:",
		"Motion Dependencies are missing! Therefore despite my best efforts I'll have to disable motion, Dave. This is most embarrassing for us both."
	)
} else if (config.motion.enabled == "external") {
	// check to see if the external motion event folder exists
	fs.access(detectionDir, function (err) {
		// if not
		if (err && err.code === "ENOENT") {
			// create it
			fs.mkdir(detectionDir, function () {
				console.debug("created motion directory", detectionDir)
			})
		} else {
			// make sure the directory is empty
			rmDir(detectionDir, false)
		}
		// change detector function
		// watch for a file to appear in the folder
		fs.watch(detectionDir, (eventType, filename) => {
			if (filename) {
				// remove the file
				fs.unlink(path.join(detectionDir, filename), function (error) {
					// consume the enonet error
					if (error == null) {
						//console.debug('motion detected from external source');
						// if the start motion file
						if (filename === detectionFile) {
							// signal motion started
							console.log("!s:", "motionstart")
						} else {
							// signal motion ended
							console.log("!e:", "motionend")
						}
					}
				})
			} else {
				console.log("filename not provided")
			}
		})
	})
}
var rmDir = function (dirPath, removeSelf) {
	if (removeSelf === undefined) {
		removeSelf = true
	}
	try {
		var files = fs.readdirSync(dirPath)
	} catch (e) {
		return
	}
	if (files.length > 0) {
		for (var i = 0; i < files.length; i++) {
			var filePath = dirPath + "/" + files[i]
			if (fs.statSync(filePath).isFile()) {
				fs.unlinkSync(filePath)
			} else {
				rmDir(filePath)
			}
		}
	}
	if (removeSelf) {
		fs.rmdirSync(dirPath)
	}
}