nix-module-wrapper-manager-fds/modules/wrapper-manager/build.nix

{
  config,
  lib,
  pkgs,
  ...
}:

{
  options.build = {
    isBinary = lib.mkOption {
      type = lib.types.bool;
      description = ''
        Sets the build step to create a tiny compiled executable for the
        wrapper. By default, it is set to `true`.

        ::: {.warning}
        Binary wrappers cannot have runtime expansion in its arguments
        especially when setting environment variables that needs it. For this,
        you'll have to switch to shell wrappers (e.g., `build.isBinary =
        false`).
        :::
      '';
      default = true;
      example = false;
    };

    extraSetup = lib.mkOption {
      type = lib.types.lines;
      description = ''
        Additional script for setting up the wrapper script derivation.
      '';
      default = "";
    };

    extraPassthru = lib.mkOption {
      type = with lib.types; attrsOf anything;
      description = ''
        Set of data to be passed through `passthru` of the resulting
        derivation.
      '';
      default = { };
    };

    toplevel = lib.mkOption {
      type = lib.types.package;
      readOnly = true;
      internal = true;
      description = "A derivation containing the wrapper script.";
    };
  };

  config = {
    build = {
      toplevel =
        let
          mkWrapBuild =
            wrappers:
            lib.concatMapStrings (v: ''
              makeWrapper "${v.arg0}" "${builtins.placeholder "out"}/bin/${v.executableName}" ${lib.concatStringsSep " " v.makeWrapperArgs}
            '') wrappers;

          mkDesktopEntries = desktopEntries: builtins.map (entry: pkgs.makeDesktopItem entry) desktopEntries;

          desktopEntries = mkDesktopEntries (lib.attrValues config.xdg.desktopEntries);
        in
        pkgs.symlinkJoin {
          passthru = config.build.extraPassthru;
          name = "wrapper-manager-fds-wrapped-package";
          paths = desktopEntries ++ config.basePackages;
          nativeBuildInputs =
            if config.build.isBinary then [ pkgs.makeBinaryWrapper ] else [ pkgs.makeWrapper ];
          postBuild = ''
            ${config.build.extraSetup}
            ${mkWrapBuild (lib.attrValues config.wrappers)}
          '';
        };
    };
  };
}