Add nix build to CI

.github/workflows/ci.yml

@@ -1,38 +1,28 @@
-name: CI
-
+name: ArrayFire CI
 on:
   push:
-    branches: [master]
+    branches:
+      - master
   pull_request:
-    branches: [master]
+
+env:
+  ACTIONS_ALLOW_UNSECURE_COMMANDS: true
 
 jobs:
   build:
-    runs-on: macos-latest
-
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
 
-      - name: Install ArrayFire
-        run: brew install arrayfire
-
-      - name: Set up GHC
-        uses: haskell-actions/setup@v2
-        with:
-          ghc-version: '9.8.4'
-          cabal-version: 'latest'
-
-      - name: Cache cabal store
-        uses: actions/cache@v4
+      - uses: cachix/install-nix-action@v31
         with:
-          path: ~/.cabal/store
-          key: ${{ runner.os }}-cabal-${{ hashFiles('cabal.project', '*.cabal') }}
-          restore-keys: |
-            ${{ runner.os }}-cabal-
+          nix_path: nixpkgs=channel:nixpkgs-unstable
 
-      - name: Configure
-        run: cabal configure --flags="disable-default-paths disable-build-tool-depends" --extra-include-dirs=$(brew --prefix arrayfire)/include --extra-lib-dirs=$(brew --prefix arrayfire)/lib
+      - name: Nix channel --update
+        run: nix-channel --update
 
-      - name: Build
-        run: cabal build arrayfire
+      - name: Cabal update
+        run: nix develop --command bash -c 'cabal update'
 
+      - name: Build and run tests
+        run: nix develop --command bash -c 'cabal install hspec-discover && cabal test'

arrayfire.cabal

@@ -7,7 +7,7 @@ license:             BSD-3-Clause
 license-file:        LICENSE
 author:              David Johnson
 maintainer:          code@dmj.io
-copyright:           David Johnson (c) 2018-2025
+copyright:           David Johnson (c) 2018-2026
 category:            Math
 build-type:          Custom
 extra-source-files:  CHANGELOG.md
@@ -88,7 +88,7 @@ library
   c-sources:
     cbits/wrapper.c
   build-depends:
-    base < 5, filepath, vector
+    base < 5, deepseq, filepath, vector
   hs-source-dirs:
     src
   ghc-options:

flake.nix

@@ -5,11 +5,6 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
     nix-filter.url = "github:numtide/nix-filter";
-    arrayfire-nix = {
-      url = "github:twesterhout/arrayfire-nix";
-      inputs.flake-utils.follows = "flake-utils";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
   };
 
   outputs = inputs:
@@ -30,13 +25,50 @@
         ];
       };
 
+      # Build ArrayFire from the official binary installer; avoids freeimage entirely.
+      mkArrayfire = pkgs: pkgs.stdenv.mkDerivation rec {
+        pname = "arrayfire";
+        version = "3.10.0";
+        src = pkgs.fetchurl {
+          url = "https://arrayfire.s3.amazonaws.com/${version}/ArrayFire-v${version}_Linux_x86_64.sh";
+          hash = "sha256-8SibCWnRxts79S6WEHb3skF2TIDl1QnjY6EiohmoIog=";
+        };
+        nativeBuildInputs = [ pkgs.autoPatchelfHook ];
+        # GPU/visualization libs (CUDA, OpenGL, GLFW, FreeImage, Intel OpenCL) are
+        # optional ArrayFire backends not available in headless CI environments.
+        autoPatchelfIgnoreMissingDeps = true;
+        buildInputs = with pkgs; [
+          stdenv.cc.cc.lib
+          fftw
+          fftwFloat
+          openblas
+          ocl-icd
+          boost.out
+        ];
+        unpackPhase = "true";
+        installPhase = ''
+          mkdir -p $out
+          bash $src --exclude-subdir --prefix=$out
+        '';
+        meta = {
+          description = "A general-purpose library for parallel and massively-parallel architectures";
+          platforms = [ "x86_64-linux" ];
+        };
+      };
+
+      arrayfire-overlay = self: super: {
+        arrayfire = mkArrayfire self;
+      };
+
       # An overlay that lets us test arrayfire-haskell with different GHC versions
       arrayfire-haskell-overlay = self: super: {
         haskell = super.haskell // {
           packageOverrides = inputs.nixpkgs.lib.composeExtensions super.haskell.packageOverrides
             (hself: hsuper: {
               arrayfire = self.haskell.lib.appendConfigureFlags
-                (hself.callCabal2nix "arrayfire" src { af = self.arrayfire; })
+                (hself.callCabal2nix "arrayfire" src {
+                  af = self.arrayfire;
+                })
                 [ "-f disable-default-paths" ];
             });
         };
@@ -55,21 +87,20 @@
             cabal-install
             doctest
             hsc2hs
-            hspec-discover
-            # Language servers
-            haskell-language-server
+            # hspec-discover
             nil
             # Formatters
             nixpkgs-fmt
           ];
           shellHook = ''
+            export LD_LIBRARY_PATH="${pkgs.arrayfire}/lib:$LD_LIBRARY_PATH"
           '';
         };
 
       pkgs-for = system: import inputs.nixpkgs {
         inherit system;
         overlays = [
-          inputs.arrayfire-nix.overlays.default
+          arrayfire-overlay
           arrayfire-haskell-overlay
         ];
       };
@@ -78,7 +109,6 @@
       packages = inputs.flake-utils.lib.eachDefaultSystemMap (system:
         with (pkgs-for system); {
           default = haskellPackages.arrayfire;
-          haskell = haskell.packages;
         });
 
       devShells = inputs.flake-utils.lib.eachDefaultSystemMap (system: {