format/commitgraph: Split layer files

1 files changed, 23 insertions, 0 deletions

diff --git a/format/commitgraph/layerinfo.go b/format/commitgraph/layerinfo.go
new file mode 100644
index 00000000..f5750368
--- /dev/null
+++ b/format/commitgraph/layerinfo.go
@@ -0,0 +1,23 @@
+package commitgraph
+
+// LayerInfo describes one loaded commit-graph layer.
+type LayerInfo struct {
+	Path      string
+	BaseCount uint32
+	Commits   uint32
+}
+
+// Layers returns loaded layer metadata in native chain order.
+func (reader *Reader) Layers() []LayerInfo {
+	out := make([]LayerInfo, 0, len(reader.layers))
+	for i := range reader.layers {
+		layer := reader.layers[i]
+		out = append(out, LayerInfo{
+			Path:      layer.path,
+			BaseCount: layer.baseCount,
+			Commits:   layer.numCommits,
+		})
+	}
+
+	return out
+}