move to nix flakes

flake.nix

@@ -0,0 +1,87 @@
+{
+  description = "di";
+  inputs = {
+    nixpkgs = {
+      url = "github:NixOS/nixpkgs/389cc28963163614765721eda940fd5299f18458";
+    };
+    flake-parts = { url = "github:hercules-ci/flake-parts"; };
+    hs_bsb-http-chunked = {
+      url =
+        "github:sjakobi/bsb-http-chunked/c0ecd72fe2beb1cf7de9340cc8b4a31045460532";
+      flake = false;
+    };
+  };
+
+  outputs = inputs@{ ... }:
+    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
+      flake.overlays.default = final: prev:
+        let
+          hsLib = prev.haskell.lib;
+          hsClean = drv:
+            hsLib.overrideCabal drv
+            (old: { src = prev.lib.sources.cleanSource old.src; });
+        in {
+          haskell = prev.haskell // {
+            packageOverrides = prev.lib.composeExtensions
+              (prev.haskell.packageOverrides or (_: _: { })) (hself: hsuper: {
+                df1 = hsClean (hself.callPackage ./df1 { });
+                df1-html = hsClean (hself.callPackage ./df1-html { });
+                di = hsClean (hself.callPackage ./di { });
+                di-core = hsClean (hself.callPackage ./di-core { });
+                di-df1 = hsClean (hself.callPackage ./di-df1 { });
+                di-handle = hsClean (hself.callPackage ./di-handle { });
+                di-monad = hsClean (hself.callPackage ./di-monad { });
+
+                # hoogle stuff
+                bsb-http-chunked = hself.callCabal2nix "bsb-http-chunked"
+                  inputs.hs_bsb-http-chunked { };
+                warp = hsLib.dontCheck (hself.callHackage "warp" "3.3.25" { });
+                warp-tls =
+                  hsLib.dontCheck (hself.callHackage "warp-tls" "3.3.6" { });
+                recv = hself.callHackage "recv" "0.1.0" { };
+              });
+          };
+        };
+      systems = [ "x86_64-linux" ];
+      perSystem = { config, pkgs, system, ... }: {
+        _module.args.pkgs = import inputs.nixpkgs {
+          inherit system;
+          overlays = [ inputs.self.overlays.default ];
+        };
+        packages = {
+          default = pkgs.releaseTools.aggregate {
+            name = "every output from this flake";
+            constituents = [
+              config.packages.df1
+              config.packages.df1-html
+              config.packages.di
+              config.packages.di-core
+              config.packages.di-df1
+              config.packages.di-handle
+              config.packages.di-monad
+              config.devShells.ghc
+            ];
+          };
+          inherit (pkgs.haskell.packages.ghc962)
+            df1 df1-html di di-core di-df1 di-handle di-monad;
+        };
+        devShells = {
+          default = config.devShells.ghc;
+          ghc = pkgs.haskell.packages.ghc962.shellFor {
+            packages = p: [
+              p.df1
+              p.df1-html
+              p.di
+              p.di-core
+              p.di-df1
+              p.di-handle
+              p.di-monad
+            ];
+            withHoogle = true;
+            nativeBuildInputs =
+              [ pkgs.cabal-install pkgs.cabal2nix pkgs.ghcid ];
+          };
+        };
+      };
+    };
+}