Nix: initial packaging & flake

.github/workflows/nix.yml

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+name: "CI - Nix"
+
+on:
+  push:
+
+jobs:
+  nix:
+    runs-on: "${{ matrix.os }}-latest"
+    strategy:
+      matrix:
+        os: [ubuntu, macos]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v27
+      #- uses: cachix/cachix-action@v15
+        #with:
+          #name: sofa
+          #authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+      - run: nix build -L

flake.nix

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+{
+  description = "Real-time multi-physics simulation with an emphasis on medical simulation.";
+
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    #nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    # ref. https://github.com/NixOS/nixpkgs/pull/348549
+    nixpkgs.url = "github:nim65s/nixpkgs/qt6-libqglviewer";
+    sofa = {
+      url = "github:nim65s/sofa"; # update this after PR
+      inputs = {
+        flake-parts.follows = "flake-parts";
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+  };
+
+  outputs =
+    inputs:
+    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = inputs.nixpkgs.lib.systems.flakeExposed;
+      perSystem =
+        {
+          pkgs,
+          self',
+          system,
+          ...
+        }:
+        {
+          apps.default = {
+            type = "app";
+            program =
+              pkgs.runCommand "runSofa"
+                {
+                  nativeBuildInputs = [ pkgs.makeBinaryWrapper ];
+                  meta.mainProgram = "runSofa";
+                }
+                ''
+                  makeBinaryWrapper ${pkgs.lib.getExe self'.packages.sofa} $out/bin/runSofa \
+                    --set SOFA_PLUGIN_PATH ${self'.packages.sofa-python3} \
+                    --set SOFA_ROOT ${self'.packages.sofa} \
+                    --add-flags "-l SofaPython3"
+                '';
+          };
+          devShells.default = pkgs.mkShell { inputsFrom = [ self'.packages.default ]; };
+          packages = {
+            inherit (inputs.sofa.packages.${system}) sofa;
+            default = self'.packages.sofa-python3;
+            sofa-python3 = pkgs.callPackage ./package.nix { inherit (self'.packages) sofa; };
+          };
+        };
+    };
+}

package.nix

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+{
+  cmake,
+  lib,
+  python3Packages,
+  qt6Packages,
+  sofa,
+  stdenv,
+}:
+
+stdenv.mkDerivation {
+  pname = "sofa-python3";
+  version = "24.06";
+
+  src = lib.fileset.toSource {
+    root = ./.;
+    fileset = lib.fileset.unions [
+      ./bindings
+      ./CMake
+      ./CMakeLists.txt
+      ./constants
+      ./docs
+      ./examples
+      ./Plugin
+      ./SofaPython3Config.cmake.in
+      ./splib
+      ./Testing
+    ];
+  };
+
+  nativeBuildInputs = [
+    cmake
+    qt6Packages.libqglviewer
+    qt6Packages.wrapQtAppsHook
+  ];
+  propagatedBuildInputs = [
+    python3Packages.pybind11
+    python3Packages.scipy
+    sofa
+  ];
+
+  # help locate FindQGLViewer.cmake
+  cmakeFlags = [
+    "-DCMAKE_MODULE_PATH=${sofa.src}/cmake/Modules"
+  ];
+
+  meta = {
+    description = "python plugin for Sofa offering a pythonic interface and python3 support";
+    homepage = "https://github.com/sofa-framework/SofaPython3";
+    license = lib.licenses.lgpl21Only;
+    maintainers = with lib.maintainers; [ nim65s ];
+    platforms = lib.platforms.unix ++ lib.platforms.windows;
+  };
+}