{pkgs, ...}:
pkgs.writeShellApplication {
  name = "active-window";
  runtimeInputs = [pkgs.jq];
  text = ''
    if [[ -n "''${NIRI_SOCKET:-}" ]]; then
      FOCUSED_ID=$(niri msg --json focused-window | jq '.id')
      niri msg --json windows \
        | jq --argjson id "$FOCUSED_ID" \
             '[.[] | select(.id == $id)] | first
              | {compositor: "niri", class: .app_id, pid: .pid}'
    elif [[ -n "''${HYPRLAND_INSTANCE_SIGNATURE:-}" ]]; then
      hyprctl activewindow -j \
        | jq '{compositor: "hyprland", class: .class, pid: .pid}'
    else
      printf '{"compositor":"unknown","class":null,"pid":null}\n'
    fi
  '';
}