add jujutsu in home manager module

home/modules/programs/default.nix

@@ -24,5 +24,6 @@
     ./swaync.nix
     ./helix
     ./waybar.nix
+    ./jujutsu.nix
   ];
 }

home/modules/programs/jujutsu.nix

@@ -0,0 +1,104 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+let
+  cfg = config.youthlic.programs.jujutsu;
+in
+{
+  options = {
+    youthlic.programs.jujutsu = {
+      enable = lib.mkEnableOption "jujutsu";
+      email = lib.mkOption {
+        type = lib.types.str;
+        description = ''
+          jujutsu email
+        '';
+      };
+      signKey = lib.mkOption {
+        type = lib.types.addCheck (lib.types.nullOr lib.types.str) (
+          x: (x == null || config.youthlic.programs.gpg.enable)
+        );
+        default = null;
+        description = ''
+          key fingerprint for sign commit
+        '';
+      };
+      name = lib.mkOption {
+        type = lib.types.str;
+        example = ''youthlic'';
+        description = ''
+          jujutsu name
+        '';
+      };
+    };
+  };
+  config = lib.mkMerge [
+    (lib.mkIf cfg.enable {
+      home.packages = with pkgs; [
+        delta
+        watchman
+      ];
+      programs.jujutsu = {
+        enable = true;
+        settings = {
+          "$schema" = "https://jj-vcs.github.io/jj/latest/config-schema.json";
+          snapshot = {
+            auto-track = "true";
+            max-new-file-size = 0;
+          };
+          core = {
+            fsmonitor = "watchman";
+            watchman.register-snapshot-trigger = true;
+          };
+          user = {
+            name = cfg.name;
+            email = cfg.email;
+          };
+          ui = {
+            color = "auto";
+            movement.edit = true;
+            graph.style = "square";
+            show-cryptographic-signatures = true;
+            pager = "delta";
+            diff = {
+              tool = "delta";
+              format = "git";
+            };
+            default-command = "log";
+          };
+          templates = {
+            log = ''
+              builtin_log_compact_full_description
+            '';
+          };
+          template-aliases = {
+            "format_short_signature(signature)" = "signature";
+          };
+          revset-aliases = {
+            "immutable_heads()" = ''
+              builtin_immutable_heads() | (trunk().. & ~mine())
+            '';
+          };
+          git = {
+            abandon-unreachable-commits = false;
+          };
+        };
+      };
+    })
+    (lib.mkIf (cfg.enable && (cfg.signKey != null)) {
+      programs.jujutsu.settings = {
+        git = {
+          sign-on-push = true;
+        };
+        signing = {
+          behavior = "drop";
+          backend = "gpg";
+          key = cfg.signKey;
+        };
+      };
+    })
+  ];
+}