Fallback to random port if the default is taken. (#330)

* Added: set port & setting methods to Config class (#328)

* Update port when taken and start live-server again (fixes #328)

Author: Almo7aya

src/Config.ts

@@ -25,6 +25,10 @@ export class Config {
         return Config.configuration.get(val) as T;
     }
 
+    private static setSettings(key: string, val: number, isGlobal: boolean = false): Thenable<void> {
+        return Config.configuration.update(key, val, isGlobal);
+    }
+
     public static get getHost(): string {
         return Config.getSettings<string>('host');
     }
@@ -37,6 +41,10 @@ export class Config {
         return Config.getSettings<number>('port');
     }
 
+    public static setPort(port: number): Thenable<void> {
+        return Config.setSettings('port', port);
+    }
+
     public static get getRoot(): string {
         return Config.getSettings<string>('root');
     }

src/appModel.ts

@@ -83,7 +83,7 @@ export class AppModel implements IAppModel {
             this.tagMissedCallback();
         });
 
-        LiveServerHelper.StartServer(params, (serverInstance) => {
+        LiveServerHelper.StartServer(params, async (serverInstance) => {
             if (serverInstance && serverInstance.address) {
                 this.LiveServerInstance = serverInstance;
                 this.runningPort = serverInstance.address().port;
@@ -100,10 +100,13 @@ export class AppModel implements IAppModel {
                 }
             }
             else {
-                if (!serverInstance.errorMsg)
-                    this.showPopUpMsg(`Error on port ${Config.getPort}. Please try to change the port through settings or report on GitHub.`, true);
-                else
+                if (!serverInstance.errorMsg) {
+                    await Config.setPort(Config.getPort + 1); // + 1 will be fine
+                    this.showPopUpMsg(`The default port : ${Config.getPort - 1} is currently taken, changing port to : ${Config.getPort}.`);
+                    this.Golive(pathUri);
+                } else {
                     this.showPopUpMsg(`Something is went wrong! Please check into Developer Console or report on GitHub.`, true);
+                }
                 this.IsServerRunning = true; // to revert status - cheat :p
                 this.ToggleStatusBar(); // reverted
             }