Added the seek event to version1 as well. Closes #23 entirely

lib/mpv/mpv.js

@@ -2,6 +2,8 @@
 // Child Process to module to start mpv player
 var spawn = require('child_process').spawn;
 var exec  = require('child_process').execSync;
+// Socket
+var net   = require('net');
 // EventEmitter
 var eventEmitter = require('events').EventEmitter;
 
@@ -172,6 +174,66 @@ function mpv(options, mpv_args){
 					// emit unpaused event
 					this.emit("resumed");
 					break;
+				case "seek":
+					if(this.options.verbose){console.log("Event: seek")};
+					// socket to watch for the change after a seek has happened
+					let observeSocket = new net.Socket();
+					// startseek position
+					let seekstarttimepos = this.currentTimePos;
+					// timeout tracker
+					let timeout = 0;
+					// promise to watch the socket output
+					new Promise((resolve, reject) => {
+						// connect a tempoary socket to the mpv player
+						observeSocket.connect({path: this.options.socket}, () =>{
+							// receive the data
+							observeSocket.on('data', (data) => {
+								// increase timeout
+								timeout += 1;
+								// console.log(data.toJSON());
+								let messages = data.toString('utf-8').split('\n');
+								// check every message
+								messages.forEach((message) => {
+									// ignore empty messages
+									if(message.length > 0){
+										message = JSON.parse(message);
+										if("event" in message){
+											// after the seek is finished the playback-restart event is emitted
+											if(message.event === "playback-restart"){
+												// resolve the promise
+												resolve({
+													"start": seekstarttimepos,
+													"end": this.currentTimePos
+												});
+											}
+											// when the track has changed we don't need a seek event
+											else if (message.event === "tracks-changed"){
+												reject("Track changed after seek");
+											}
+										}
+									}
+								});
+								// reject the promise if it took to long until the playback-restart happens
+								// to prevent having sockets listening forever
+								if(timeout > 10){
+									reject("Seek event timeout");
+								}
+							});
+						});
+					})
+					// socket destruction and event emittion
+					.then((times) => {
+						observeSocket.destroy();
+						this.emit('seek', (times));
+					})
+					// handle any rejection of the promise
+					.catch((status) => {
+						observeSocket.destroy();
+						if(this.options.debug){
+							console.log(status);
+						}
+					});
+					break;
 				// observed properties
 				case "property-change":
 					// time position events are handled seperately