flake.nix

{
  description = "QGIS";

  nixConfig = {
    #   extra-substituters = [ "https://example.cachix.org" ];
    #   extra-trusted-public-keys = [ "example.cachix.org-1:xxxx=" ];

    bash-prompt = "\\[\\033[1m\\][qgis-dev]\\[\\033\[m\\]\\040\\w >\\040";
  };

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  };

  outputs =
    inputs@{ flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "aarch64-darwin"
      ];

      perSystem =
        {
          config,
          self',
          inputs',
          pkgs,
          system,
          ...
        }:
        {
          _module.args.pkgs = import inputs.nixpkgs {
            inherit system;
            overlays = [
              (final: prev: {
                # Build with libspatialindex 2.0.0
                # https://github.com/qgis/QGIS/pull/63196
                libspatialindex = prev.libspatialindex.overrideAttrs (prev: rec {
                  version = "2.0.0";
                  src = final.fetchFromGitHub {
                    owner = "libspatialindex";
                    repo = "libspatialindex";
                    rev = "refs/tags/${version}";
                    hash = "sha256-hZyAXz1ddRStjZeqDf4lYkV/g0JLqLy7+GrSUh75k20=";
                  };
                }); # end of libspatialindex
              })
            ];
            config = { };
          };

          packages = rec {
            qgis = pkgs.qt6Packages.callPackage ./nix/package.nix { };
            docs = pkgs.qt6Packages.callPackage ./nix/documentation.nix {
              qgisMinorVersion = "master";
            };
            default = qgis;
          };

          apps = {
            docs =
              let
                wwwLauncher = pkgs.writeShellApplication {
                  name = "website";
                  runtimeInputs = [ pkgs.python3 ];
                  text = ''
                    exec ${pkgs.lib.getExe pkgs.python3} \
                      -m http.server 8000 \
                      -d ${self'.packages.docs}
                  '';
                };
              in
              {
                type = "app";
                program = "${wwwLauncher}/bin/website";
                meta.description = "QGIS documentation";
              };
          };

          devShells.default =
            pkgs.mkShell {
              inputsFrom = [
                self'.packages.qgis
                self'.packages.qgis.passthru.unwrapped
              ];

              shellHook = ''
                export QT_PLUGIN_PATH="${pkgs.qt6Packages.qtbase}/${pkgs.qt6Packages.qtbase.qtPluginPrefix}"
                export QT_QPA_PLATFORM_PLUGIN_PATH="${pkgs.qt6Packages.qtbase}/${pkgs.qt6Packages.qtbase.qtPluginPrefix}/platforms"

                export LD_LIBRARY_PATH="${pkgs.libspatialite}/lib:''$LD_LIBRARY_PATH"

                # TODO: take inspiration from
                # https://github.com/qgis/QGIS/blob/798f63fc3c0d2616a5fbc8f47139fbeb5db7c052/.docker/docker-qgis-build.sh#L79
                function dev-help {
                  echo -e "\nWelcome to the QGIS development environment !"
                  echo "Build QGIS using following commands:"
                  echo
                  echo " 1.  mkdir build && cd build"
                  cat <<EOF
                 2.  cmake .. \\
                    -G Ninja \\
                    -D CMAKE_BUILD_TYPE=Debug \\
                    -D WITH_3D=True \\
                    -D WITH_PDAL=True \\
                    -D WITH_QTWEBENGINE=True \\
                    -D CMAKE_INSTALL_PREFIX=\$PWD/app \\
                    -D QT_PLUGINS_DIR=${pkgs.qt6Packages.qtbase}/${pkgs.qt6Packages.qtbase.qtPluginPrefix} \\
                    -D QSCI_SIP_DIR=${pkgs.python3Packages.qscintilla-qt6}/${pkgs.python3.sitePackages}/PyQt6/bindings \\
                    -D QSCI_DIST_INFO=${pkgs.python3Packages.qscintilla-qt6}/${pkgs.python3.sitePackages}/pyqt6_qscintilla-${pkgs.python3Packages.qscintilla-qt6.version}.dist-info \\
                    -D PYQT6_DIST_INFO=${pkgs.python3Packages.pyqt6}/${pkgs.python3.sitePackages}/pyqt6-${pkgs.python3Packages.pyqt6.version}.dist-info
                EOF
                  echo " 3.  ninja"
                  echo " 4.  ninja install"
                  echo
                  echo "Run tests:"
                  echo
                  echo "1.  ninja test"
                  echo
                  echo "Note: run 'nix flake update' to update dependencies."
                  echo
                  echo "Run 'dev-help' to see this message again."
                }

                dev-help
              '';
            };

          checks = {
            inherit (config.packages) qgis docs;
          };
        };

      flake = { };
    };
}