1 files changed, 42 insertions, 0 deletions
diff --git a/ref/store/files/read_resolve_fully.go b/ref/store/files/read_resolve_fully.go
new file mode 100644
index 00000000..de58eb6d
--- /dev/null
+++ b/ref/store/files/read_resolve_fully.go
@@ -0,0 +1,42 @@
+package files
+
+import (
+	"fmt"
+	"strings"
+
+	"codeberg.org/lindenii/furgit/ref"
+)
+
+// ResolveToDetached resolves symbolic references through the visible files store
+// namespace until one detached reference is reached.
+func (store *Store) ResolveToDetached(name string) (ref.Detached, error) {
+	cur := name
+	seen := make(map[string]struct{})
+
+	for {
+		if _, ok := seen[cur]; ok {
+			return ref.Detached{}, fmt.Errorf("refstore/files: symbolic reference cycle at %q", cur)
+		}
+
+		seen[cur] = struct{}{}
+
+		resolved, err := store.Resolve(cur)
+		if err != nil {
+			return ref.Detached{}, err
+		}
+
+		switch resolved := resolved.(type) {
+		case ref.Detached:
+			return resolved, nil
+		case ref.Symbolic:
+			target := strings.TrimSpace(resolved.Target)
+			if target == "" {
+				return ref.Detached{}, fmt.Errorf("refstore/files: symbolic reference %q has empty target", resolved.Name())
+			}
+
+			cur = target
+		default:
+			return ref.Detached{}, fmt.Errorf("refstore/files: unsupported reference type %T", resolved)
+		}
+	}
+}