clean nix files a bit

default.nix

@@ -0,0 +1,5 @@
+{ pkgs ? import <nixpkgs> {}, self ? ./., packageName ? "chaoszone" }:
+let
+  gitignore = dir: pkgs.nix-gitignore.gitignoreSource [] dir;
+in
+  pkgs.haskellPackages.callCabal2nix packageName (gitignore self) {}

flake.nix

@@ -18,22 +18,11 @@
 
           packageName = "chaoszone";
       in rec {
-        packages.${packageName} = # (ref:haskell-package-def)
-          haskellPackages.callCabal2nix packageName self rec {
-          };
+        packages.${packageName} = import ./default.nix {inherit pkgs self;};
 
         defaultPackage = self.packages.${system}.${packageName};
 
-        devShell = haskellPackages.shellFor {
-          packages = p: [ defaultPackage ];
-          withHoogle = true;
-          buildInputs = with haskellPackages; with pkgs; [
-            vim
-            haskell-language-server
-            ghcid
-            cabal-install
-          ];
-        };
+        devShell = import ./shell.nix {inherit pkgs; chaoszone = defaultPackage;};
         #devShell = pkgs.mkShell {
         #  buildInputs = with haskellPackages; [
         #    haskell-language-server

shell.nix

@@ -1,8 +1,11 @@
-{ pkgs ? import <nixpkgs> {}}:
+{ pkgs ? import <nixpkgs> {}, chaoszone ? null}:
 
 let
-  chaoszone_cz =
-    pkgs.haskellPackages.callCabal2nix "chaoszone" (gitignore ./.) {};
+  chaoszone_cz = if isNull chaoszone
+    then
+      (import ./default.nix {inherit pkgs; packageName = "chaoszone";})
+    else
+      chaoszone;
   gitignore = dir: pkgs.nix-gitignore.gitignoreSource [] dir;
 in
   pkgs.haskellPackages.shellFor {