reduce: add rere mode

1 files changed, 17 insertions, 0 deletions

diff --git a/skate/cmd/skate-reduce/main.go b/skate/cmd/skate-reduce/main.go
index c0ef9fc..098240a 100644
--- a/skate/cmd/skate-reduce/main.go
+++ b/skate/cmd/skate-reduce/main.go
@@ -44,6 +44,11 @@
 // * oled  | zippy mode for releases and OL inputs, emit biblioref.
 //         |
 //         | $ skate-reduce -m oled -F a.ndj -O b.ndj
+//         |
+//         |
+// * rere  | zippy mode for OL release and ref (as release) inputs, emit biblioref.
+//         |
+//         | $ skate-reduce -m rere -O a.ndj -F b.ndj
 //
 package main
 
@@ -159,6 +164,18 @@ func main() {
 		if err := skate.ZippyVerifyRefsOpenLibrary(o, f, bw); err != nil {
 			log.Fatal(err)
 		}
+	case "rere":
+		o, f, err := xio.OpenTwo(*releases, *refs)
+		if err != nil {
+			log.Fatal(err)
+		}
+		r, ok := reasonMap[*reason]
+		if !ok {
+			log.Fatalf("unknown reason: %v", *reason)
+		}
+		if err := skate.ZippyExactReleases(o, f, r, bw); err != nil {
+			log.Fatal(err)
+		}
 	default:
 		log.Fatalf("invalid mode")
 	}