migrated all languages to devshell

modules/dev/rust.nix

@@ -4,16 +4,34 @@
   pkgs,
   ...
 }:
+let
+  packages = builtins.attrValues {
+    inherit (pkgs)
+      cargo # Rust package manager
+      rust-analyzer # Language server for Rust
+      clippy # Linter for Rust
+      rustfmt # Formatter for Rust code
+      ;
+  };
+in
 {
-  options.my.dev.rust.enable = lib.mkEnableOption "enable";
+  options = {
+    my.dev.rust.enable = lib.mkEnableOption "Install Rust tooling globally";
+    devShells.rust = lib.mkOption {
+      type = lib.types.package;
+      default = pkgs.mkShell {
+        inherit packages;
+        name = "rust-dev-shell";
+        shellHook = ''
+          echo "🦀 Rust dev environment"
+        '';
+      };
+      description = "Rust development shell with cargo and rust-analyzer";
+    };
+  };
   config = lib.mkIf config.my.dev.rust.enable {
-    users.users.jawz.packages = builtins.attrValues {
-      inherit (pkgs)
-        cargo # Rust package manager
-        rust-analyzer # Language server for Rust
-        clippy # Linter for Rust
-        rustfmt # Formatter for Rust code
-        ;
+    users.users.jawz = {
+      inherit packages;
     };
   };
 }