Enhance Pipenv manager registration and configuration (microsoft#1170)

Fixes microsoft#590
Improve the Pipenv manager to support existing environments even when
the CLI is not available. Update the configuration to include the Pipenv
executable path for better integration.

Author: karthiknadig

src/managers/common/nativePythonFinder.ts

@@ -568,6 +568,7 @@ class NativePythonFinderImpl implements NativePythonFinder {
             workspaceDirectories: this.api.getPythonProjects().map((item) => item.uri.fsPath),
             environmentDirectories: extraSearchPaths,
             condaExecutable: getPythonSettingAndUntildify<string>('condaPath'),
+            pipenvExecutable: getPythonSettingAndUntildify<string>('pipenvPath'),
             poetryExecutable: getPythonSettingAndUntildify<string>('poetryPath'),
             cacheDirectory: this.cacheDirectory?.fsPath,
         };
@@ -602,6 +603,9 @@ class NativePythonFinderImpl implements NativePythonFinder {
         if (a.condaExecutable !== b.condaExecutable) {
             return false;
         }
+        if (a.pipenvExecutable !== b.pipenvExecutable) {
+            return false;
+        }
         if (a.poetryExecutable !== b.poetryExecutable) {
             return false;
         }
@@ -634,6 +638,7 @@ type ConfigurationOptions = {
     workspaceDirectories: string[];
     environmentDirectories: string[];
     condaExecutable: string | undefined;
+    pipenvExecutable: string | undefined;
     poetryExecutable: string | undefined;
     cacheDirectory?: string;
 };

src/managers/pipenv/main.ts

@@ -5,7 +5,7 @@ import { getPythonApi } from '../../features/pythonApi';
 import { PythonProjectManager } from '../../internal.api';
 import { NativePythonFinder } from '../common/nativePythonFinder';
 import { PipenvManager } from './pipenvManager';
-import { getPipenv } from './pipenvUtils';
+import { getPipenv, hasPipenvEnvironments } from './pipenvUtils';
 
 import { notifyMissingManagerIfDefault } from '../common/utils';
 
@@ -19,15 +19,29 @@ export async function registerPipenvFeatures(
     try {
         const pipenv = await getPipenv(nativeFinder);
 
-        if (pipenv) {
+        // Register the manager if the CLI is found, or if there are existing pipenv environments.
+        // This allows users with existing pipenv environments to still see and use them.
+        const hasPipenvEnvs = !pipenv && (await hasPipenvEnvironments(nativeFinder));
+
+        if (pipenv || hasPipenvEnvs) {
             const mgr = new PipenvManager(nativeFinder, api);
             disposables.push(mgr, api.registerEnvironmentManager(mgr));
+            if (!pipenv) {
+                traceInfo(
+                    'Pipenv CLI not found, but pipenv environments were discovered. Registering manager for read-only environment management. To enable full pipenv features, set the "python.pipenvPath" setting to the path of your pipenv executable.',
+                );
+            }
         } else {
-            traceInfo('Pipenv not found, turning off pipenv features.');
+            traceInfo(
+                'Pipenv not found, turning off pipenv features. If you have pipenv installed in a non-standard location, set the "python.pipenvPath" setting.',
+            );
             await notifyMissingManagerIfDefault('ms-python.python:pipenv', projectManager, api);
         }
     } catch (ex) {
-        traceInfo('Pipenv not found, turning off pipenv features.', ex);
+        traceInfo(
+            'Pipenv not found, turning off pipenv features. If you have pipenv installed in a non-standard location, set the "python.pipenvPath" setting.',
+            ex,
+        );
         await notifyMissingManagerIfDefault('ms-python.python:pipenv', projectManager, api);
     }
 }

src/managers/pipenv/pipenvUtils.ts

@@ -49,6 +49,17 @@ export async function clearPipenvCache(): Promise<void> {
     pipenvPath = undefined;
 }
 
+/**
+ * Check if any pipenv environments exist without requiring the pipenv CLI.
+ * This allows the manager to be registered even if the CLI is not found.
+ */
+export async function hasPipenvEnvironments(nativeFinder: NativePythonFinder): Promise<boolean> {
+    const data = await nativeFinder.refresh(false);
+    return data
+        .filter((e) => isNativeEnvInfo(e))
+        .some((e) => (e as NativeEnvInfo).kind === NativePythonEnvironmentKind.pipenv);
+}
+
 function getPipenvPathFromSettings(): string | undefined {
     const pipenvPath = getSettingWorkspaceScope<string>('python', 'pipenvPath');
     return pipenvPath ? pipenvPath : undefined;
@@ -191,12 +202,13 @@ export async function refreshPipenv(
 
     const collection: PythonEnvironment[] = [];
 
+    // Add environments even if pipenv CLI is not found.
+    // This allows users with existing pipenv environments to still see them
+    // for read-only management (e.g., selecting the environment, viewing info).
     for (const e of envs) {
-        if (pipenv) {
-            const environment = await nativeToPythonEnv(e, api, manager);
-            if (environment) {
-                collection.push(environment);
-            }
+        const environment = await nativeToPythonEnv(e, api, manager);
+        if (environment) {
+            collection.push(environment);
         }
     }
 
@@ -212,11 +224,10 @@ export async function resolvePipenvPath(
 ): Promise<PythonEnvironment | undefined> {
     const resolved = await nativeFinder.resolve(fsPath);
 
+    // Resolve pipenv environments even if the pipenv CLI is not found.
+    // This allows proper environment identification for read-only scenarios.
     if (resolved.kind === NativePythonEnvironmentKind.pipenv) {
-        const pipenv = await getPipenv(nativeFinder);
-        if (pipenv) {
-            return await nativeToPythonEnv(resolved, api, manager);
-        }
+        return await nativeToPythonEnv(resolved, api, manager);
     }
 
     return undefined;