* Drop TypeCompose as a dependency,

   and use Data.Functor.Compose
   from base.
* use hpack to generate cabal
* build with Nix
* bump stack to use lts-20.4
* bump version to 0.5.0.2

.envrc

@@ -0,0 +1,8 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.2.0; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.0/direnvrc" "sha256-5EwyKnkJNQeXrRkYbwwRBcXbibosCJqyIUuz9Xq+LRc="
+fi
+
+nix_direnv_watch_file devenv.nix
+nix_direnv_watch_file devenv.lock
+nix_direnv_watch_file devenv.yaml
+use flake . --impure

.gitignore

@@ -1,2 +1,3 @@
 dist
 .stack-work
+.devenv

changelog.txt

@@ -1,4 +1,5 @@
 HEAD
+- Drop TypeCompose dependency
 - Reorganize directory structure and make typed interface the central one.
 - Add serialise instances.
 - Drop Generic/Generic1/Typeable/Typeable1 instances for older GHCs

default.nix

@@ -0,0 +1,3 @@
+(import (fetchTarball https://github.com/edolstra/flake-compat/archive/master.tar.gz) {
+  src = builtins.fetchGit ./.;
+}).defaultNix

flake.nix

@@ -0,0 +1,71 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs?ref=haskell-updates";
+    devenv.url = "github:cachix/devenv";
+    nix-filter.url = "github:numtide/nix-filter";
+  };
+
+  outputs = { self, nixpkgs, devenv, nix-filter, ... }@inputs:
+    with nix-filter.lib;
+    let
+      config = { allowBroken = true; };
+      overlays.default = final: previous: {
+        haskellPackages = with final.haskell.lib;
+          previous.haskellPackages.extend (hfinal: hprevous:
+            with hfinal; {
+              spatial-math = callCabal2nix "spatial-math" (filter {
+                root = self;
+                exclude = [ "stack.yaml" (matchExt "cabal") ];
+              }) { };
+            });
+      };
+      systems = [
+        "x86_64-linux"
+        # "i686-linux"
+        "x86_64-darwin"
+        # "aarch64-linux"
+        # "aarch64-darwin"
+      ];
+      forAllSystems = f:
+        builtins.listToAttrs (map (name: {
+          inherit name;
+          value = f name;
+        }) systems);
+    in {
+      packages = forAllSystems (system:
+        let
+          pkgs = import nixpkgs {
+            inherit config system;
+            overlays = [ overlays.default ];
+          };
+        in {
+          default = pkgs.haskellPackages.spatial-math;
+        });
+      devShells = forAllSystems (system:
+        let
+          pkgs = import nixpkgs {
+            inherit config system;
+            overlays = [ overlays.default ];
+          };
+        in {
+          default = devenv.lib.mkShell {
+            inherit inputs pkgs;
+            modules = with pkgs.haskellPackages; with pkgs; [{
+              env = { name = "spatial-math"; };
+              packages =
+                [ (ghcWithPackages (p: with p; [ haskell-language-server spatial-math ])) ];
+              scripts = {
+                run-ghcid.exec = "${ghcid}/bin/ghcid -W -a -c 'cabal repl lib:spatial-math'";
+                setUp.exec = ''
+                  ${hpack}/bin/hpack -f package.yaml
+                  ${implicit-hie}/bin/gen-hie --cabal &> hie.yaml
+                '';
+              };
+              enterShell = "
+                setUp
+              ";
+            }];
+          };
+        });
+    };
+}

package.yaml

@@ -0,0 +1,51 @@
+name:                spatial-math
+version:             0.5.0.2
+synopsis:            3d math including quaternions/euler angles/dcms and utility functions
+license:             BSD3
+license-file:        LICENSE
+author:              Greg Horn
+maintainer:          gregmainland@gmail.com
+copyright:           Copyright (c) 2012-2019, Greg Horn
+category:            Math
+github:              ghorn/spatial-math
+test-with:           GHC==9.2
+
+extra-source-files:
+  - README.md
+  - changelog.txt
+
+library:
+  source-dirs:      src
+  dependencies:
+    - base
+    - ghc-prim
+    - cereal
+    - binary
+    - serialise
+    - linear
+    - lens
+  ghc-options:         -Wall -Werror
+
+tests:
+  doctests:
+    main: doctests.hs
+    source-dirs: tests
+    when:
+      - condition: false
+        other-modules: Main
+    dependencies:
+      - base
+      - doctest
+    ghc-options: -O2 -threaded -Wall -Werror
+    build-tools: doctest-discover
+
+  unit-tests:
+    main: Main.hs
+    source-dirs: tests
+    dependencies:
+      - base
+      - spatial-math
+      - QuickCheck
+      - test-framework
+      - test-framework-quickcheck2
+    ghc-options: -O2 -Wall -Werror

shell.nix

@@ -0,0 +1,3 @@
+(import (fetchTarball https://github.com/edolstra/flake-compat/archive/master.tar.gz) {
+  src = builtins.fetchGit ./.;
+}).shellNix