nix/devShell.nix

# nix/devShell.nix — Fast dev shell with stamp-file optimization
{ inputs, ... }: {
  perSystem = { pkgs, ... }:
    let
      python = pkgs.python311;
    in {
      devShells.default = pkgs.mkShell {
        packages = with pkgs; [
          python uv nodejs_20 ripgrep git openssh ffmpeg
        ];

        shellHook = ''

          echo "Hermes Agent dev shell"



          # Composite stamp: changes when nix python or uv change

          STAMP_VALUE="${python}:${pkgs.uv}"

          STAMP_FILE=".venv/.nix-stamp"



          # Create venv if missing

          if [ ! -d .venv ]; then

            echo "Creating Python 3.11 venv..."

            uv venv .venv --python ${python}/bin/python3

          fi



          source .venv/bin/activate



          # Only install if stamp is stale or missing

          if [ ! -f "$STAMP_FILE" ] || [ "$(cat "$STAMP_FILE")" != "$STAMP_VALUE" ]; then

            echo "Installing Python dependencies..."

            uv pip install -e ".[all]"

            if [ -d mini-swe-agent ]; then

              uv pip install -e ./mini-swe-agent 2>/dev/null || true

            fi

            if [ -d tinker-atropos ]; then

              uv pip install -e ./tinker-atropos 2>/dev/null || true

            fi



            # Install npm deps

            if [ -f package.json ] && [ ! -d node_modules ]; then

              echo "Installing npm dependencies..."

              npm install

            fi



            echo "$STAMP_VALUE" > "$STAMP_FILE"

          fi



          echo "Ready. Run 'hermes' to start."

        '';
      };
    };
}