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Code Placement Reference Guide

📁 File Structure

/workspaces/Haskell-Run/
├── src/
│   ├── extension.ts                    (MODIFIED)
│   ├── ghci/
│   │   └── GhciReplManager.ts          (NEW - CREATED)
│   ├── debugger/
│   ├── providers/
│   ├── test/
│   └── utils/
│       └── repl.ts                     (OLD - Still exists, not used)
├── package.json
└── tsconfig.json

🔍 What Was Added/Modified

New File: src/ghci/GhciReplManager.ts (288 lines)

  • Location: /workspaces/Haskell-Run/src/ghci/GhciReplManager.ts
  • Purpose: Core REPL management class
  • Key Class: export class GhciReplManager
  • Key Methods:
    • constructor(outputChannel: vscode.OutputChannel)
    • runCommand(command: string): Promise<string>
    • loadModule(filePath, moduleName, loadedModules): Promise<string>
    • reloadModule(moduleName, loadedModules): Promise<string>
    • evaluate(expression: string): Promise<string>
    • dispose(): void
    • isAlive(): boolean

Modified File: src/extension.ts (379 lines)

  • Import added (Line 7):

    import { GhciReplManager } from './ghci/GhciReplManager';

  • Initialization in activate() (Lines 24-28):

    const ghciRepl = new GhciReplManager(outputChannel);
const loadedModules = new Set<string>();
context.subscriptions.push({
    dispose: () => ghciRepl.dispose()
});

  • Updated runSelectedFunction command (Lines 291-310):

    • Calls ghciRepl.loadModule() instead of old replManager.loadModule()
    • Calls ghciRepl.evaluate() instead of old replManager.evaluateInRepl()
    • Removed all setTimeout() delays

  • Updated REPL commands (Lines 320-330):

    • haskellrun.restartRepl - Creates new GhciReplManager instance
    • haskellrun.clearRepl - Disposes current REPL

✅ Compilation Status

  • ✅ Build: Successful (0 errors)
  • ✅ TypeScript: All types correct
  • ✅ Dependencies: All imports resolved
  • ✅ Watch mode: Active and running

🚀 How to Use the New Code

In Extension Commands:

// Load a module
await ghciRepl.loadModule(filePath, moduleName, loadedModules);

// Evaluate an expression
const result = await ghciRepl.evaluate("someFunction 42");

// Handle errors
try {
  await ghciRepl.loadModule(...);
} catch (error) {
  vscode.window.showErrorMessage(`Failed: ${error}`);
}

// Clean up
ghciRepl.dispose();

Key Features:

  1. No hard-coded delays - Prompt detection via regex
  2. Promise-based - Async/await compatible
  3. Error detection - Automatic error parsing
  4. State safety - Updates only on success
  5. Logging - Full output channel integration

📋 Checklist for Verification

  • New file created: src/ghci/GhciReplManager.ts
  • Extension.ts imports GhciReplManager
  • GhciReplManager initialized in activate()
  • Resource disposal registered in subscriptions
  • runSelectedFunction uses new API
  • REPL commands (restart/clear) updated
  • No TypeScript errors
  • Build completes successfully
  • Output channel integration working
  • Manual testing of functionality (TODO)

🔧 Testing the Implementation

To verify it works:

  1. Open a Haskell file (.hs)
  2. Run the "Run Function" command
  3. Check output channel for logs starting with ✓/✗/📦/🔄/▶️
  4. Try a function that doesn't exist - should show error
  5. Try restart REPL command - should reinitialize

Documentation Created: January 9, 2026 Status: ✅ Implementation Complete and Buildable