add home-manager develop module

home-modules/default.nix

@@ -0,0 +1,5 @@
+{
+  flake.homeManagerModules = {
+    xun = import ./xun;
+  };
+}

home-modules/xun/default.nix

@@ -0,0 +1,5 @@
+{
+  imports = [
+    ./develop
+  ];
+}

home-modules/xun/develop/default.nix

@@ -0,0 +1,42 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}: let
+  cfg = config.xun.develop;
+in {
+  options.xun.develop = {
+    enable = lib.mkEnableOption "develop";
+    nix.enable = lib.mkEnableOption "nix";
+    tools.enable = lib.mkEnableOption "tools";
+    docs.enable = lib.mkEnableOption "man caches";
+    lsp.c.enable = lib.mkEnableOption "clangd";
+  };
+
+  config = let
+    config =
+      if cfg.enable
+      then {
+        nix.enable = true;
+        tools.enable = true;
+        docs.enable = true;
+        lsp.c.enable = true;
+      }
+      else cfg;
+  in
+    lib.mkMerge [
+      (lib.mkIf config.nix.enable {
+        home.packages = with pkgs; [nil alejandra];
+      })
+      (lib.mkIf config.tools.enable {
+        home.packages = with pkgs; [tokei];
+      })
+      (lib.mkIf config.lsp.c.enable {
+        home.packages = with pkgs; [clang-tools];
+      })
+      (lib.mkIf config.docs.enable {
+        programs.man.generateCaches = true;
+      })
+    ];
+}