nixpkgs/pkgs/by-name/sw/sway/package.nix

{
  lib,
  sway-unwrapped,
  makeWrapper,
  symlinkJoin,
  writeShellScriptBin,
  withBaseWrapper ? true,
  extraSessionCommands ? "",
  dbus,
  withGtkWrapper ? false,
  wrapGAppsHook3,
  gdk-pixbuf,
  glib,
  gtk3,
  extraOptions ? [ ], # E.g.: [ "--verbose" ]
  # Used by the NixOS module:
  isNixOS ? false,

  enableXWayland ? true,
  dbusSupport ? true,
}:

assert extraSessionCommands != "" -> withBaseWrapper;

let
  inherit (builtins) replaceStrings;
  inherit (lib.lists) optional optionals;
  inherit (lib.meta) getExe;
  inherit (lib.strings) concatMapStrings optionalString;

  sway = sway-unwrapped.overrideAttrs (oa: {
    inherit isNixOS enableXWayland;
  });
  baseWrapper = writeShellScriptBin sway.meta.mainProgram ''
    set -o errexit
    if [ ! "$_SWAY_WRAPPER_ALREADY_EXECUTED" ]; then
      export XDG_CURRENT_DESKTOP=${sway.meta.mainProgram}
      ${extraSessionCommands}
      export _SWAY_WRAPPER_ALREADY_EXECUTED=1
    fi
    if [ "$DBUS_SESSION_BUS_ADDRESS" ]; then
      export DBUS_SESSION_BUS_ADDRESS
      exec ${getExe sway} "$@"
    else
      exec ${optionalString dbusSupport "${dbus}/bin/dbus-run-session"} ${getExe sway} "$@"
    fi
  '';
in
symlinkJoin rec {
  pname = replaceStrings [ "-unwrapped" ] [ "" ] sway.pname;
  inherit (sway) version;
  name = "${pname}-${version}";

  paths = (optional withBaseWrapper baseWrapper) ++ [ sway ];

  strictDeps = false;
  nativeBuildInputs = [ makeWrapper ] ++ (optional withGtkWrapper wrapGAppsHook3);

  buildInputs = optionals withGtkWrapper [
    gdk-pixbuf
    glib
    gtk3
  ];

  # We want to run wrapProgram manually
  dontWrapGApps = true;

  postBuild = ''
    ${optionalString withGtkWrapper "gappsWrapperArgsHook"}

    wrapProgram $out/bin/${sway.meta.mainProgram} \
      ${optionalString withGtkWrapper ''"''${gappsWrapperArgs[@]}"''} \
      ${optionalString (extraOptions != [ ])
        "${concatMapStrings (x: " --add-flags " + x) extraOptions}"
      }
  '';

  passthru = {
    inherit (sway.passthru) tests;
    providedSessions = [ sway.meta.mainProgram ];
  };

  inherit (sway) meta;
}