wip: modularize home-manager

modules/home-manager/git.nix

@@ -0,0 +1,26 @@
+{ config, pkgs, lib, ... }: 
+
+with lib;
+
+let
+  cfg = config.custom-hm.git;
+in
+{
+  options = {
+    enable = mkEnableOption "Enable git configuration";
+  };
+  config = {
+    programs.git = {
+      enable = true;
+      delta.enable = true;
+      userName = "Xinyang Li";
+      userEmail = "lixinyang411@gmail.com";
+      aliases = {
+        graph = "log --all --oneline --graph --decorate";
+        a = "add";
+        d = "diff";
+        s = "status";
+      };
+    };
+  };
+}