Merge pull request #2165 from GitoxideLabs/copilot/fix-ceb7b1a4-93f5-4da1-a4f2-4290c8f594eb

Add `Kind::empty_blob()` and `Kind::empty_tree()` methods to gix-hash

Author: Byron

gix-hash/src/kind.rs

@@ -113,4 +113,16 @@ impl Kind {
             Kind::Sha1 => ObjectId::null_sha1(),
         }
     }
+
+    /// The hash of an empty blob.
+    #[inline]
+    pub const fn empty_blob(&self) -> ObjectId {
+        ObjectId::empty_blob(*self)
+    }
+
+    /// The hash of an empty tree.
+    #[inline]
+    pub const fn empty_tree(&self) -> ObjectId {
+        ObjectId::empty_tree(*self)
+    }
 }

gix-hash/tests/hash/kind.rs

@@ -1,3 +1,5 @@
+use gix_hash::{Kind, ObjectId};
+
 mod from_hex_len {
     use gix_hash::Kind;
 
@@ -14,3 +16,15 @@ mod from_hex_len {
         assert_eq!(Kind::from_hex_len(65), None);
     }
 }
+
+#[test]
+fn empty_blob() {
+    let sha1 = Kind::Sha1;
+    assert_eq!(sha1.empty_blob(), ObjectId::empty_blob(sha1));
+}
+
+#[test]
+fn empty_tree() {
+    let sha1 = Kind::Sha1;
+    assert_eq!(sha1.empty_tree(), ObjectId::empty_tree(sha1));
+}