refstore/chain: Split

1 files changed, 44 insertions, 0 deletions

diff --git a/refstore/chain/list.go b/refstore/chain/list.go
new file mode 100644
index 00000000..e1594e95
--- /dev/null
+++ b/refstore/chain/list.go
@@ -0,0 +1,44 @@
+package chain
+
+import (
+	"fmt"
+
+	"codeberg.org/lindenii/furgit/ref"
+)
+
+// List lists references from every backend and deduplicates by ref name.
+//
+// First-seen wins, so earlier backends have precedence.
+func (chain *Chain) List(pattern string) ([]ref.Ref, error) {
+	var refs []ref.Ref
+
+	seen := map[string]struct{}{}
+
+	for i, backend := range chain.backends {
+		if backend == nil {
+			continue
+		}
+
+		listed, err := backend.List(pattern)
+		if err != nil {
+			return nil, fmt.Errorf("refstore: backend %d list: %w", i, err)
+		}
+
+		for _, entry := range listed {
+			if entry == nil {
+				continue
+			}
+
+			name := entry.Name()
+			if _, ok := seen[name]; ok {
+				continue
+			}
+
+			seen[name] = struct{}{}
+
+			refs = append(refs, entry)
+		}
+	}
+
+	return refs, nil
+}