From 90c007db869ee1a0e0bf662b19eabfb1187ff44e Mon Sep 17 00:00:00 2001
From: Tom Clegg <tom@tomclegg.ca>
Date: Wed, 7 Oct 2020 09:22:50 -0400
Subject: [PATCH] When writing library, write tags too.

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@tomclegg.ca>
---
 import.go |  1 +
 taglib.go | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/import.go b/import.go
index e24b25dfac..30e86a153f 100644
--- a/import.go
+++ b/import.go
@@ -156,6 +156,7 @@ func (cmd *importer) RunCommand(prog string, args []string, stdin io.Reader, std
 
 	tilelib := &tileLibrary{taglib: taglib, includeNoCalls: cmd.includeNoCalls, skipOOO: cmd.skipOOO}
 	if cmd.outputTiles {
+		cmd.encoder.Encode(LibraryEntry{TagSet: taglib.Tags()})
 		tilelib.encoder = cmd.encoder
 	}
 	go func() {
diff --git a/taglib.go b/taglib.go
index 3dc45b80c0..f92a91f375 100644
--- a/taglib.go
+++ b/taglib.go
@@ -117,3 +117,17 @@ func (taglib *tagLibrary) setTags(tags [][]byte) error {
 	}
 	return nil
 }
+
+func (taglib *tagLibrary) Tags() [][]byte {
+	out := make([][]byte, len(taglib.tagmap))
+	untwobit := []byte{'a', 'c', 'g', 't'}
+	for key, info := range taglib.tagmap {
+		seq := make([]byte, taglib.keylen)
+		for i := len(seq) - 1; i >= 0; i-- {
+			seq[i] = untwobit[int(key)&3]
+			key = key >> 2
+		}
+		out[int(info.id)] = seq
+	}
+	return out
+}
-- 
2.30.2