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{
  description = "a sisu like document parser search form";
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  inputs.spine-d-overlay = {
    url = "git://git.sisudoc.org/package/dlang-nix-overlays-and-flake";
    inputs.nixpkgs.follows = "nixpkgs";
  };
  outputs = {
    self,
    nixpkgs,
    spine-d-overlay,
    ...
  }@inputs: let
    pname = "spine_search";
    version = "0.18.0";
    #shell = ./shell.nix;
    #devEnv = ./nixDevEnv.sh;
    supportedSystems = ["x86_64-linux"];
    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
    nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;}); # nixpkgs instantiated for supported system types
    localOverlay = (final: prev: {
      ldc = prev.callPackage ./nix-overlays/ldc {  };                           # -> ok 1.42.0
      # dmd overlay: revert to GCC14; (current) GCC 15 introduced nullptr in its headers, and DMD's ImportC parser needs update to handle it, monitor and update:
      dmd = prev.callPackage ./nix-overlays/dmd { stdenv = prev.gcc14Stdenv; }; # -> ok 2.111.0
      dub = prev.callPackage ./nix-overlays/dub {  };                           # -> ? 1.40.0
      #gdc = prev.callPackage ./nix-overlays/gdc {  };
    });
    pkgsForSystem = system: import nixpkgs {
      overlays = [
        localOverlay
      ];
      inherit system;
    };
    mkSpineSearch = { pkgs, compilerPkg, compilerBin, buildType }: pkgs.stdenv.mkDerivation {
      inherit pname version;
      meta.mainProgram = "spine_search";
      #executable = true; # not used
      src = self;
      buildInputs = [ pkgs.sqlite ];
      nativeBuildInputs = [ pkgs.dub compilerPkg pkgs.gnumake ];
      preBuild = ''
        export HOME=$TMPDIR
        #export HOME=$(pwd)
      '';
      buildPhase = ''
        runHook preBuild
        buildCMD="dub run --cache=local --compiler=$(type -P ${compilerBin}) --build=${buildType} --combined --skip-registry=all"
        echo $buildCMD
        $buildCMD
        echo $buildCMD
        runHook postBuild
      '';
      checkPhase = ''
        runHook preCheck
        dub test --combined --skip-registry=all
        runHook postCheck
      '';
      installPhase = ''
        runHook preInstall
        mkdir -p $out/cgi-bin
        install -m755 -D ./cgi-bin/spine_search $out/cgi-bin/spine_search
        runHook postInstall
      '';
      postInstall = ''
        echo `ls -la $out/cgi-bin/spine_search`
      '';
    };
    shellHook = ''
      export Date=`date "+%Y%m%d"`
    '';
    mkDevShell = { pkgs, name, compiler, extraPackages ? [] }: pkgs.mkShell {
      inherit name shellHook;
      packages = [
        pkgs.direnv
        pkgs.nix-direnv
        compiler
        pkgs.dub
        pkgs.dtools
        pkgs.gnumake
        pkgs.sqlite
        pkgs.gnugrep
        pkgs.gnused
        pkgs.ripgrep
      ] ++ extraPackages;
    };
  in {
    packages = forAllSystems (system: let
      pkgs-ovl = pkgsForSystem system;
      pkgs-nix = nixpkgsFor.${system};
    in {
      default = self.packages.${system}.spine-search-nixpkgs-ldc;
      spine-search-nixpkgs-dmd = mkSpineSearch {
        pkgs = pkgs-nix;
        # nixpkgs dmd: revert to GCC14 (same nullptr/ImportC fix as overlay dmd)
        compilerPkg = pkgs-nix.dmd.override { stdenv = pkgs-nix.gcc14Stdenv; };
        compilerBin = "dmd";
        buildType = "dmd";
      };
      spine-search-nixpkgs-ldc = mkSpineSearch {
        pkgs = pkgs-nix;
        compilerPkg = pkgs-nix.ldc;
        compilerBin = "ldmd2";
        buildType = "ldmd2";
      };
      spine-search-overlay-dmd = mkSpineSearch {
        pkgs = pkgs-ovl;
        compilerPkg = pkgs-ovl.dmd;
        compilerBin = "dmd";
        buildType = "dmd";
      };
      spine-search-overlay-ldc = mkSpineSearch {
        pkgs = pkgs-ovl;
        compilerPkg = pkgs-ovl.ldc;
        compilerBin = "ldmd2";
        buildType = "ldmd2";
      };
      #spine-search-overlay-gdc = mkSpineSearch {
      #  pkgs = pkgs-ovl;
      #  compilerPkg = pkgs-ovl.gdc;
      #  compilerBin = "gdc";
      #  buildType = "gdc";
      #};
    });
    devShells = forAllSystems (system: let
      pkgs-ovl = pkgsForSystem system;
      pkgs-nix = nixpkgsFor.${system};
    in
      with pkgs-nix; {
        dsh-d-overlay = spine-d-overlay.devShells.${system}.default;
        dsh-overlay = mkShell {
          name = "${pname}-${version} dev shell (overlay)";
          packages = with pkgs-ovl; [
            ldc
            #dmd
            dub
            gnumake
            sqlite
          ];
          inherit shellHook;
        };
        dsh-nixpkgs-dmd = mkShell {
          name = "${pname}-${version} dev shell (nixpkgs dmd)";
          packages = [
            dmd
            dub
            gnumake
            sqlite
          ];
          inherit shellHook;
        };
        dsh-nixpkgs-ldc = mkShell {
          name = "${pname}-${version} dev shell (nixpkgs ldc)";
          packages = [
            ldc
            dub
            gnumake
            sqlite
          ];
          inherit shellHook;
        };
        dsh-overlay-dmd = mkShell {
          name = "${pname}-${version} dev shell (overlay dmd)";
          # "spine-0.18.0 base dev shell, dmd-2.111.0, dub-1.40.0";
          packages = with pkgs-ovl; [
            dmd
            dub
            gnumake
            sqlite
          ];
          inherit shellHook;
        };
        dsh-overlay-ldc = mkShell {
          name = "${pname}-${version} dev shell (overlay ldc)";
          # "spine-0.18.0 base dev shell, ldc-1.42.0, dub-1.40.0";
          packages = with pkgs-ovl; [
            ldc
            dub
            gnumake
            sqlite
          ];
          inherit shellHook;
        };
        dsh-sqlite = mkShell {
          name = "${pname}-${version} dev shell (sqlite)";
          packages = [
            ldc
            #dmd
            dub
            gnumake
            sqlite
          ];
          inherit shellHook;
        };
        default = self.devShells.${system}.dsh-nixpkgs-ldc;
        #default = import ./shell.nix {pkgs = pkgs-nix;};
      });
  };
}