python3 layout module for https://direnv.net/ - using uv and allows to use a specific python version

direnvrc

layout_uv() {
  local python_version="${1:-}"
  local should_recreate=0
  
  # Check if we need to recreate venv due to version mismatch
  if [[ -d ".venv" && -n "$python_version" ]]; then
    local current_version
    if [[ -f ".venv/bin/python" ]]; then
      current_version=$(.venv/bin/python --version 2>&1 | grep -oE '[0-9]+\.[0-9]+')
    elif [[ -f ".venv/Scripts/python.exe" ]]; then
      current_version=$(.venv/Scripts/python.exe --version 2>&1 | grep -oE '[0-9]+\.[0-9]+')
    fi
    
    if [[ -n "$current_version" && "$current_version" != "$python_version"* ]]; then
      log_status "Python version mismatch (current: $current_version, requested: $python_version). Recreating venv."
      rm -rf .venv
      should_recreate=1
    fi
  fi
  
  if [[ ! -d ".venv" || $should_recreate -eq 1 ]]; then
    if [[ ! -f "pyproject.toml" ]]; then
      log_status "No uv project exists. Executing \`uv init\` to create one."
      uv init --no-readme
      rm -f main.py
    fi
    
    if [[ -n "$python_version" ]]; then
      log_status "Creating venv with Python $python_version"
      uv venv --python "$python_version"
    else
      uv venv
    fi
    
    # Install pip into the venv
    uv pip install --python .venv/bin/python pip
    
    if [[ -f "pyproject.toml" ]]; then
      uv sync
    fi
  fi
  
  VIRTUAL_ENV="$(pwd)/.venv"

  # Ensure uv is in PATH first
  if command -v uv >/dev/null 2>&1; then
    PATH_add "$(dirname "$(command -v uv)")"
  fi

  if [ -d ".venv/bin" ]; then
    PATH_add .venv/bin
  elif [ -d ".venv/Scripts" ]; then
    PATH_add .venv/Scripts
  fi
  export UV_ACTIVE=1
  export VIRTUAL_ENV
}

example .envrc

layout uv 3.13