Fix select interpreter (#601)

This PR enhances the "Select Interpreter" dropdown in the Python
Environments extension by including the full path to each interpreter in
the description text, making it easier for users to identify and
distinguish between different Python environments.

(copilot did this via
eleanorjboyd#1 but
the PR was created wrong)

fixes #593

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: eleanorjboyd

src/common/pickers/environments.ts

@@ -157,14 +157,20 @@ export async function pickEnvironment(
     ];
 
     if (options?.recommended) {
+        const pathDescription = options.recommended.displayPath;
+        const description =
+            options.recommended.description && options.recommended.description.trim()
+                ? `${options.recommended.description} (${pathDescription})`
+                : pathDescription;
+
         items.push(
             {
                 label: Common.recommended,
                 kind: QuickPickItemKind.Separator,
             },
             {
                 label: options.recommended.displayName,
-                description: options.recommended.description,
+                description: description,
                 result: options.recommended,
                 iconPath: getIconPath(options.recommended.iconPath),
             },
@@ -179,9 +185,13 @@ export async function pickEnvironment(
         const envs = await manager.getEnvironments('all');
         items.push(
             ...envs.map((e) => {
+                const pathDescription = e.displayPath;
+                const description =
+                    e.description && e.description.trim() ? `${e.description} (${pathDescription})` : pathDescription;
+
                 return {
                     label: e.displayName ?? e.name,
-                    description: e.description,
+                    description: description,
                     result: e,
                     manager: manager,
                     iconPath: getIconPath(e.iconPath),
@@ -194,12 +204,18 @@ export async function pickEnvironment(
 }
 
 export async function pickEnvironmentFrom(environments: PythonEnvironment[]): Promise<PythonEnvironment | undefined> {
-    const items = environments.map((e) => ({
-        label: e.displayName ?? e.name,
-        description: e.description,
-        e: e,
-        iconPath: getIconPath(e.iconPath),
-    }));
+    const items = environments.map((e) => {
+        const pathDescription = e.displayPath;
+        const description =
+            e.description && e.description.trim() ? `${e.description} (${pathDescription})` : pathDescription;
+
+        return {
+            label: e.displayName ?? e.name,
+            description: description,
+            e: e,
+            iconPath: getIconPath(e.iconPath),
+        };
+    });
     const selected = await showQuickPick(items, {
         placeHolder: Pickers.Environments.selectEnvironment,
         ignoreFocusOut: true,

src/test/common/environmentPicker.unit.test.ts

@@ -0,0 +1,87 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+import assert from 'node:assert';
+import { Uri } from 'vscode';
+import { PythonEnvironment } from '../../api';
+
+/**
+ * Test the logic used in environment pickers to include interpreter paths in descriptions
+ */
+suite('Environment Picker Description Logic', () => {
+    const createMockEnvironment = (
+        displayPath: string,
+        description?: string,
+        name: string = 'Python 3.9.0',
+    ): PythonEnvironment => ({
+        envId: { id: 'test', managerId: 'test-manager' },
+        name,
+        displayName: name,
+        displayPath,
+        version: '3.9.0',
+        environmentPath: Uri.file(displayPath),
+        description,
+        sysPrefix: '/path/to/prefix',
+        execInfo: { run: { executable: displayPath } },
+    });
+
+    suite('Description formatting with interpreter path', () => {
+        test('should use displayPath as description when no original description exists', () => {
+            const env = createMockEnvironment('/usr/local/bin/python');
+
+            // This is the logic from our updated picker
+            const pathDescription = env.displayPath;
+            const description =
+                env.description && env.description.trim() ? `${env.description} (${pathDescription})` : pathDescription;
+
+            assert.strictEqual(description, '/usr/local/bin/python');
+        });
+
+        test('should append displayPath to existing description in parentheses', () => {
+            const env = createMockEnvironment('/home/user/.venv/bin/python', 'Virtual Environment');
+
+            // This is the logic from our updated picker
+            const pathDescription = env.displayPath;
+            const description =
+                env.description && env.description.trim() ? `${env.description} (${pathDescription})` : pathDescription;
+
+            assert.strictEqual(description, 'Virtual Environment (/home/user/.venv/bin/python)');
+        });
+
+        test('should handle complex paths correctly', () => {
+            const complexPath = '/usr/local/anaconda3/envs/my-project-env/bin/python';
+            const env = createMockEnvironment(complexPath, 'Conda Environment');
+
+            // This is the logic from our updated picker
+            const pathDescription = env.displayPath;
+            const description =
+                env.description && env.description.trim() ? `${env.description} (${pathDescription})` : pathDescription;
+
+            assert.strictEqual(description, `Conda Environment (${complexPath})`);
+        });
+
+        test('should handle empty description correctly', () => {
+            const env = createMockEnvironment('/opt/python/bin/python', '');
+
+            // This is the logic from our updated picker
+            const pathDescription = env.displayPath;
+            const description =
+                env.description && env.description.trim() ? `${env.description} (${pathDescription})` : pathDescription;
+
+            // Empty string should be treated like no description, so just use path
+            assert.strictEqual(description, '/opt/python/bin/python');
+        });
+
+        test('should handle Windows paths correctly', () => {
+            const windowsPath = 'C:\\Python39\\python.exe';
+            const env = createMockEnvironment(windowsPath, 'System Python');
+
+            // This is the logic from our updated picker
+            const pathDescription = env.displayPath;
+            const description =
+                env.description && env.description.trim() ? `${env.description} (${pathDescription})` : pathDescription;
+
+            assert.strictEqual(description, 'System Python (C:\\Python39\\python.exe)');
+        });
+    });
+});