add support for external motion detection

motion.js

@@ -1,11 +1,16 @@
 '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 == true && require.resolve('johnny-five').length > 0 && require.resolve('raspi-io').length > 0 ) {
+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');
@@ -35,6 +40,61 @@ if (config.motion.enabled == true && require.resolve('johnny-five').length > 0 &
 			console.log("!e:","motionend");
 		});
 	});
-} else if ( config.motion.enabled == true){
+} 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);
+				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);
+	};
+

motion.md

@@ -0,0 +1,44 @@
+h1>Motion Detection configuration</h1>
+
+ <p>Smart-Mirror supports 2 approaches to motion detection 
+
+ <ul>
+<li>Hardware PIR sensor wired to Raspberry PI</li>
+<li>Externally provided sensor of some kind
+<p>this could be via a webcam or some other mechanism</p>
+</li>
+</ul>
+<p>to enable motion detection, you must first enable the autosleep function.
+othewise smart-mirror will never go to sleep at all
+
+ <p>once autosleep is enabled (pick TV or Monitor, depending on what kind of display you are using for smart-mirror)
+then select either PIN or External mode in the Motion, Mode dropdown
+
+ <p>once you select external motion, smart-mirror will start looking for the files that indicate motion is occurring 
+
+ <p>the <b>external-motion</b> script in the scripts folder can be used to provide the proper file names and location to support the built in detection code. 
+
+ <p>an Example of an external motion detection provider is the github Motion project at <a href="https://motion-project.github.io/">https://motion-project.github.io/</a>
+
+ as part of the Motion project configuration, you can have it signal 
+<ul>
+<li>motion start</li>
+<li>how long to wait from last motion detection (gap)</li>
+<li>motion ended</li>
+</ul>
+
+ <p>to enable motion detection, modify the <b>/etc/motion/motion.conf</b> file, and set these lines 
+<ul>
+<li>on_event_start /home/pi/smart-mirror/scripts/external-motion started</li>
+<li>on_event_end /home/pi/smart-mirror/scripts/external-motion ended</li>
+<li>event_gap n
+<p>where n is the number of seconds since the last motion was detected until signalling motion end
+<p> for example, if you had event_gap 15, this would mean wait 15 seconds since the last motion, and then signal event_ended.
+<p>but if there was motion again in 14 seconds then it would wait ANOTHER 15 seconds from then, before signaling event end..
+this helps detect continupus motion.. 
+<p>see the help from the Motion tool for more configuration options.
+
+ </li>
+<p>Note: smart-mirror currently does not have any processing when motion ended is detected, but this event is reported. 
+this could change in the future
+</ul>

plugins/autosleep/config.schema.json

@@ -42,9 +42,14 @@
             "title": "Motion Settings",
             "properties": {
                 "enabled": {
-                    "type": "boolean",
-                    "title": "Check to Enable Motion Detection",
-                    "default":false
+                    "type": "string",
+                    "title": "Select type Motion Detection",
+                    "default":false,
+                    "enum":[
+                      "false",
+                      "pin",
+                      "external"
+                    ]
                 },
                 "pin": {
                     "type": "string",