Poetry: Incorrect default virtualenvs path on Windows and macOS

[karthiknadig]

Problem

In poetryUtils.ts, the fallback for Poetry's virtualenvs path uses ~/.cache/pypoetry/virtualenvs on all platforms, but Windows has a different default location.

Current Code

// poetryUtils.ts L169-172
const home = getUserHomeDir();
if (home) {
    poetryVirtualenvsPath = path.join(home, '.cache', 'pypoetry', 'virtualenvs');
}

Issue

Poetry uses platform-specific default locations:

• Linux: ~/.cache/pypoetry/virtualenvs ✅
• macOS: ~/Library/Caches/pypoetry/virtualenvs
• Windows: %LOCALAPPDATA%\pypoetry\Cache\virtualenvs or %APPDATA%\pypoetry\Cache\virtualenvs

The current code hardcodes the Linux path for all platforms, causing Poetry environments to not be discovered on Windows.

PET Server Reference

The PET server correctly handles this via Platformdirs in pet-poetry/src/config.rs:

let default_cache_dir = Platformdirs::new(_APP_NAME.into(), false).user_cache_path();

Suggested Fix

Use platform-specific paths:

function getDefaultVirtualenvsPath(): string | undefined {
    const home = getUserHomeDir();
    if (!home) return undefined;
    
    if (isWindows()) {
        // Try LOCALAPPDATA first, then APPDATA
        const localAppData = process.env.LOCALAPPDATA;
        if (localAppData) {
            return path.join(localAppData, 'pypoetry', 'Cache', 'virtualenvs');
        }
        const appData = process.env.APPDATA;
        if (appData) {
            return path.join(appData, 'pypoetry', 'Cache', 'virtualenvs');
        }
    } else if (process.platform === 'darwin') {
        return path.join(home, 'Library', 'Caches', 'pypoetry', 'virtualenvs');
    }
    
    // Linux default
    return path.join(home, '.cache', 'pypoetry', 'virtualenvs');
}

Affected File

src/managers/poetry/poetryUtils.ts