feat: add Kind::all()

Author: cruessler

gix-hash/src/kind.rs

@@ -174,4 +174,21 @@ impl Kind {
     pub const fn empty_tree(&self) -> ObjectId {
         ObjectId::empty_tree(*self)
     }
+
+    /// Return a list of available hash kinds.
+    #[inline]
+    pub const fn all() -> &'static [Self] {
+        #[cfg(all(feature = "sha1", not(feature = "sha256")))]
+        {
+            &[Self::Sha1]
+        }
+        #[cfg(all(not(feature = "sha1"), feature = "sha256"))]
+        {
+            &[Self::Sha256]
+        }
+        #[cfg(all(feature = "sha1", feature = "sha256"))]
+        {
+            &[Self::Sha1, Self::Sha256]
+        }
+    }
 }

gix-hash/tests/hash/kind.rs

@@ -103,3 +103,21 @@ fn longest_sha1_and_sha256() {
     let longest = Kind::longest();
     assert_eq!(longest, Kind::Sha256);
 }
+
+#[test]
+#[cfg(all(feature = "sha1", not(feature = "sha256")))]
+fn all() {
+    assert_eq!(Kind::all(), &[Kind::Sha1]);
+}
+
+#[test]
+#[cfg(all(not(feature = "sha1"), feature = "sha256"))]
+fn all() {
+    assert_eq!(Kind::all(), &[Kind::Sha256]);
+}
+
+#[test]
+#[cfg(all(feature = "sha1", feature = "sha256"))]
+fn all() {
+    assert_eq!(Kind::all(), &[Kind::Sha1, Kind::Sha256]);
+}