adds skip, previous, current url

src/MediaPlayer.ts

@@ -17,7 +17,6 @@ export class MediaPlayer {
     private dataBuffer: string = '';
 
     constructor() {
-        // Create a random string of length 5
         const socketFilename = Math.random().toString(36).substring(2, 10);
         const socketPath = `/tmp/mpv-${socketFilename}`;
 
@@ -53,6 +52,13 @@ export class MediaPlayer {
             });
     }
 
+    public async getCurrentFile(): Promise<string> {
+        return this.writeCommand("get_property", ["stream-open-filename"])
+            .then((response) => {
+                return response.data;
+            });
+    }
+
     public async getPauseState(): Promise<boolean> {
         return this.writeCommand("get_property", ["pause"])
             .then((response) => {
@@ -66,10 +72,6 @@ export class MediaPlayer {
                 return response.data;
             });
     }
-    
-    public async setVolume(volume: number) {
-        return this.writeCommand("set_property", ["volume", volume]);
-    }
 
     public async getIdle(): Promise<boolean> {
         return this.writeCommand("get_property", ["idle"])
@@ -79,19 +81,31 @@ export class MediaPlayer {
     }
 
     public async append(url: string) {
-        return this.writeCommand("loadfile", [url, "append-play"]);
+        return this.modify(() => this.writeCommand("loadfile", [url, "append-play"]));
     }
 
     public async play() {
-        return this.writeCommand("set_property", ["pause", false]);
+        return this.modify(() => this.writeCommand("set_property", ["pause", false]));
     }
 
     public async pause() {
-        return this.writeCommand("set_property", ["pause", true]);
+        return this.modify(() => this.writeCommand("set_property", ["pause", true]));
+    }
+
+    public async skip() {
+        return this.modify(() => this.writeCommand("playlist-next", []));
+    }
+
+    public async previous() {
+        return this.modify(() => this.writeCommand("playlist-prev", []));
     }
 
     public async deletePlaylistItem(index: number) {
-        return this.writeCommand("playlist-remove", [index]);
+        return this.modify(() => this.writeCommand("playlist-remove", [index]));
+    }
+        
+    public async setVolume(volume: number) {
+        return this.modify(() => this.writeCommand("set_property", ["volume", volume]));
     }
 
     public subscribe(ws: WebSocket) {
@@ -101,6 +115,15 @@ export class MediaPlayer {
     public unsubscribe(ws: WebSocket) {
         this.eventSubscribers = this.eventSubscribers.filter(subscriber => subscriber !== ws);
     }
+
+    private async modify<T>(func: () => Promise<T>): Promise<T> {
+        return func()
+            .then((result) => {
+                // Notify all subscribers
+                this.handleEvent("user_modify", {});
+                return result;
+        });
+    }
     
     private async writeCommand(command: string, args: any[]): Promise<any> {
         return new Promise((resolve, reject) => {