Done

src/code-stats-api.ts

@@ -10,6 +10,11 @@ export class CodeStatsAPI {
   private axios = null;
 
   constructor(apiKey: string, apiURL: string, userName: string) {
+    this.updateSettings(apiKey, apiURL, userName);
+  }
+
+  public updateSettings( apiKey: string, apiURL: string, userName: string) {
+
     this.API_KEY = apiKey;
     this.UPDATE_URL = apiURL;
     this.USER_NAME = userName;
@@ -71,6 +76,7 @@ export class CodeStatsAPI {
       })
       .catch(error => {
         console.log(error);
+        return null;
       });
   }
 }

src/profile-provider.ts

@@ -18,6 +18,9 @@ export class ProfileProvider implements TextDocumentContentProvider {
 
   provideTextDocumentContent(uri: Uri, token: CancellationToken): string | Thenable<string> {
 
+    if( token.isCancellationRequested )
+      return;
+
     const LEVEL_FACTOR = 0.025;
 
     function getLevel(xp: number): number {
@@ -66,6 +69,11 @@ export class ProfileProvider implements TextDocumentContentProvider {
 
     return this.api.getProfile().then(profile => {
 
+      if( profile === null )
+      {
+        return `<h1>Can't fetch profile. Please try again later</h1> Make sure <strong>codestats.username</strong> setting is set to correct user name.`;
+      }
+
       let htmlTemplate = fs.readFileSync(this.context.asAbsolutePath("assets/profile.html.eex"));
       
       profile["level"] = getLevel(profile["total_xp"]);

src/xp-counter.ts

@@ -51,17 +51,26 @@ export class XpCounter {
       this.statusBarItem.command = "code-stats.profile";
     }
 
-    let provider = new ProfileProvider(context, this.api);
-
-    let registration = workspace.registerTextDocumentContentProvider('code-stats', provider);
-  
-    subscriptions.push(registration);
-
-    let previewUri = Uri.parse('code-stats://profile')
-
+    subscriptions.push(workspace.registerTextDocumentContentProvider('code-stats', new ProfileProvider(context, this.api)));
+ 
     subscriptions.push(commands.registerCommand("code-stats.profile", () => {
-      commands.executeCommand('vscode.previewHtml', previewUri, ViewColumn.Two, 'Code::Stats Profile');
-    } ) );
+
+      let config: WorkspaceConfiguration = workspace.getConfiguration(
+        "codestats"
+      );
+
+      if (!config) {
+        window.showErrorMessage('codestats.username configuration setting is missing');
+        return;
+      }
+  
+      if( config.get("username") === '' ){
+        window.showErrorMessage('codestats.username configuration setting is missing');
+        return;
+      }
+
+      commands.executeCommand('vscode.previewHtml',  Uri.parse('code-stats://profile'), ViewColumn.Two, 'Code::Stats Profile');
+    }));
     
     workspace.onDidChangeTextDocument(
       this.onTextDocumentChanged,
@@ -145,6 +154,9 @@ export class XpCounter {
       `
     );
 
-    this.api = new CodeStatsAPI(apiKey, apiURL, userName);
+    if( this.api != null )
+      this.api.updateSettings(apiKey, apiURL, userName);
+    else
+      this.api = new CodeStatsAPI(apiKey,apiURL,userName);
   }
 }