refactor

Cargo.lock

@@ -1690,6 +1690,15 @@ dependencies = [
  "syn 2.0.119",
 ]
 
+[[package]]
+name = "diffy"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e3dc2f773b6aaa63b1a7684b8589f670a8a0146a510b74d23a401c882364b49"
+dependencies = [
+ "hashbrown 0.17.1",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -7958,6 +7967,7 @@ name = "signed_git"
 version = "0.1.0-alpha"
 dependencies = [
  "anyhow",
+ "diffy",
  "gix",
  "gix-worktree",
  "gix-worktree-state",