refactor(shells): Convert to flake-parts module

Author: PetarKirov

flake.nix

@@ -217,13 +217,13 @@
       ...
     }:
     let
-      lib = import "${nixpkgs}/lib";
-      flake = import "${self}/flake.nix";
+      inherit (nixpkgs) lib;
     in
     flake-parts.lib.mkFlake { inherit inputs; } {
       imports = [
         ./modules
         ./packages
+        ./shells
       ];
       systems = [
         "x86_64-linux"
@@ -232,19 +232,12 @@
         "aarch64-darwin"
       ];
       perSystem =
-        {
-          system,
-          pkgs,
-          inputs',
-          ...
-        }:
+        { system, ... }:
         {
           _module.args.pkgs = import nixpkgs {
             inherit system;
             config.allowUnfree = true;
           };
-          devShells.default = import ./shells/default.nix { inherit pkgs flake inputs'; };
-          devShells.ci = import ./shells/ci.nix { inherit pkgs; };
         };
       flake.lib.create =
         {

shells/ci.nix

@@ -1,38 +1,45 @@
+{ ... }:
 {
-  pkgs,
-  inputs',
-  ...
-}:
-let
-  repl = pkgs.writeShellApplication {
-    name = "repl";
-    text = ''
-      nix repl --file "$REPO_ROOT/repl.nix";
-    '';
-  };
-in
-pkgs.mkShell {
-  packages =
-    with pkgs;
-    [
-      inputs'.agenix.packages.agenix
-      inputs'.nixos-anywhere.packages.nixos-anywhere
-      figlet
-      just
-      jq
-      nix-eval-jobs
-      nixos-rebuild
-      nix-output-monitor
-      repl
-      rage
-      inputs'.dlang-nix.packages.dub
-    ]
-    ++ pkgs.lib.optionals (pkgs.stdenv.system == "x86_64-linux") [
-      inputs'.dlang-nix.packages.dmd
-    ];
+  perSystem =
+    {
+      pkgs,
+      inputs',
+      ...
+    }:
+    {
+      devShells.default =
+        let
+          repl = pkgs.writeShellApplication {
+            name = "repl";
+            text = ''
+              nix repl --file "$REPO_ROOT/repl.nix";
+            '';
+          };
+        in
+        pkgs.mkShell {
+          packages =
+            with pkgs;
+            [
+              inputs'.agenix.packages.agenix
+              inputs'.nixos-anywhere.packages.nixos-anywhere
+              figlet
+              just
+              jq
+              nix-eval-jobs
+              nixos-rebuild
+              nix-output-monitor
+              repl
+              rage
+              inputs'.dlang-nix.packages.dub
+            ]
+            ++ pkgs.lib.optionals (pkgs.stdenv.system == "x86_64-linux") [
+              inputs'.dlang-nix.packages.dmd
+            ];
 
-  shellHook = ''
-    export REPO_ROOT="$PWD"
-    figlet -t "Metacraft Nixos Modules"
-  '';
+          shellHook = ''
+            export REPO_ROOT="$PWD"
+            figlet -t "Metacraft Nixos Modules"
+          '';
+        };
+    };
 }