project: use ruby-nix

flake.nix

@@ -4,12 +4,18 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+    ruby-nix.url = "github:sagittaros/ruby-nix";
   };
 
   outputs = inputs@{ self, nixpkgs, ... }:
     let systems = inputs.flake-utils.lib.defaultSystems;
     in inputs.flake-utils.lib.eachSystem systems (system: {
-      devShells.default =
-        import ./shell.nix { pkgs = import nixpkgs { inherit system; }; };
+      devShells.default = let
+          pkgs = import nixpkgs { inherit system; };
+      in
+        import ./shell.nix {
+          inherit pkgs;
+          ruby-nix = inputs.ruby-nix.lib pkgs;
+        };
     });
 }

shell.nix

@@ -1,18 +1,20 @@
-{ pkgs ? import <nixpkgs> { } }:
+{ pkgs ? import <nixpkgs> { }, ruby-nix }:
 
 with pkgs;
 
 let
-  gems = bundlerEnv {
+  localGems = ruby-nix {
     name = "hugo-website-gems";
-    gemdir = ./.;
+    gemset = ./gemset.nix;
   };
 in
 mkShell {
-  packages = [
-    gems
-    gems.wrappedRuby
+  buildInputs = [
+    localGems.env
+    localGems.ruby
+  ];
 
+  packages = [
     git
     go
     hugo