From 4c4c04ce3f8a3d0d2551708e6af73a44a9722ebd Mon Sep 17 00:00:00 2001
From: Michael van Straten <michael@vanstraten.de>
Date: Thu, 7 Nov 2024 12:12:11 +0100
Subject: [PATCH] Add Nix Flake support and CI workflow

---
 .github/workflows/flake.yml | 32 +++++++++++++++++++
 .gitignore                  |  3 ++
 flake.lock                  | 61 +++++++++++++++++++++++++++++++++++++
 flake.nix                   | 34 +++++++++++++++++++++
 4 files changed, 130 insertions(+)
 create mode 100644 .github/workflows/flake.yml
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/.github/workflows/flake.yml b/.github/workflows/flake.yml
new file mode 100644
index 00000000..9da483ed
--- /dev/null
+++ b/.github/workflows/flake.yml
@@ -0,0 +1,32 @@
+name: Nix Flake CI
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  check-and-build:
+    name: Check and Build Nix Flake
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        system: [x86_64-linux, aarch64-linux]  # Check for multiple systems
+      fail-fast: false
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v30
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - name: Check Flake
+        run: nix flake check --all-systems --system ${{ matrix.system }}
+
+      - name: Build Flake
+        run: nix build .# --system ${{ matrix.system }}
+
diff --git a/.gitignore b/.gitignore
index 06589715..5db17433 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,3 +56,6 @@ install_manifest.txt
 *.dylib
 *.so
 *.dll
+
+# Nix build results
+result*
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..ccc9bf27
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1730785428,
+        "narHash": "sha256-Zwl8YgTVJTEum+L+0zVAWvXAGbWAuXHax3KzuejaDyo=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "4aa36568d413aca0ea84a1684d2d46f55dbabad7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..fdf4b88b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,34 @@
+{
+  description = "A Package for Automatic Differentiation of Algorithms Written in C/C++ ";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs =
+    { flake-utils, nixpkgs, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        packages = rec {
+          adolc-cmake = pkgs.stdenv.mkDerivation {
+            name = "adolc";
+            src = ./.;
+            nativeBuildInputs = [ pkgs.cmake ];
+          };
+
+          adolc-autotools = adolc-cmake.overrideAttrs (
+            _: _: {
+              nativeBuildInputs = [ pkgs.autoreconfHook ];
+            }
+          );
+
+          default = adolc-cmake;
+        };
+      }
+    );
+}