refactoring changes

Author: roulpriya

src/toolchain/swiftly.ts

@@ -1,3 +1,17 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the VS Code Swift open source project
+//
+// Copyright (c) 2025 the VS Code Swift project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of VS Code Swift project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
 import * as path from "node:path";
 import { SwiftlyConfig } from "./ToolchainVersion";
 import * as fs from "node:fs/promises";
@@ -71,7 +85,7 @@ export class Swiftly {
             const response = ListAvailableResult.parse(JSON.parse(stdout));
             return response.toolchains.map(t => t.name);
         } catch (error) {
-            throw new Error("Failed to retrieve Swiftly installations from disk.");
+            throw new Error("Failed to retrieve Swiftly installations from disk: ${error.message}");
         }
     }
 
@@ -93,7 +107,7 @@ export class Swiftly {
                 .filter((toolchain): toolchain is string => typeof toolchain === "string")
                 .map(toolchain => path.join(swiftlyHomeDir, "toolchains", toolchain));
         } catch (error) {
-            throw new Error("Failed to retrieve Swiftly installations from disk.");
+            throw new Error("Failed to retrieve Swiftly installations from disk: ${error.message}");
         }
     }
 
@@ -129,7 +143,7 @@ export class Swiftly {
                 } catch (err: unknown) {
                     const error = err as ExecFileError;
                     // Its possible the toolchain in .swift-version is misconfigured or doesn't exist.
-                    void vscode.window.showErrorMessage(`${error.stderr}`);
+                    void vscode.window.showErrorMessage(`Failed to load toolchain from Swiftly: ${error.stderr}`);
                 }
             }
         }