feat: rework to modular

shells/default.nix

@@ -0,0 +1,20 @@
+{
+  pkgs,
+  extraPackages ? [ ],
+  inputsFrom ? [ ],
+  shellHook ? "",
+}:
+pkgs.mkShell {
+  inherit inputsFrom shellHook;
+
+  packages =
+    (with pkgs; [
+      git
+      jq
+      just
+      nil
+      nixd
+      nixfmt
+    ])
+    ++ extraPackages;
+}

shells/go.nix

@@ -0,0 +1,16 @@
+{
+  pkgs,
+  extraPackages ? [ ],
+  inputsFrom ? [ ],
+  shellHook ? "",
+}:
+pkgs.mkShell {
+  inherit inputsFrom shellHook;
+
+  packages =
+    (with pkgs; [
+      go
+      gopls
+    ])
+    ++ extraPackages;
+}

shells/node.nix

@@ -0,0 +1,19 @@
+{
+  lib,
+  pkgs,
+  extraPackages ? [ ],
+  inputsFrom ? [ ],
+  shellHook ? "",
+}:
+let
+  nodejs = lib.attrByPath [ "nodejs_20" ] pkgs.nodejs pkgs;
+in
+pkgs.mkShell {
+  inherit inputsFrom shellHook;
+
+  packages = [
+    nodejs
+    pkgs.pnpm
+  ]
+  ++ extraPackages;
+}

shells/rust.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  pkgs,
+  extraPackages ? [ ],
+  inputsFrom ? [ ],
+  shellHook ? "",
+}:
+let
+  optionalPackage = path: lib.attrByPath path null pkgs;
+in
+pkgs.mkShell {
+  inherit inputsFrom shellHook;
+
+  packages = builtins.filter (pkg: pkg != null) (
+    [
+      pkgs.cargo
+      pkgs.rustc
+      (optionalPackage [ "rust-analyzer" ])
+      (optionalPackage [ "rustfmt" ])
+      (optionalPackage [ "clippy" ])
+    ]
+    ++ extraPackages
+  );
+}