From 500017f2aa6ec1b4679a6878a7624eb7beaf1ee2 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Tue, 12 May 2020 16:38:34 -0700
Subject: Idempotently add id to tag index

---
 z.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/z.scm b/z.scm
index 46e6fcf..6cec0dd 100644
--- a/z.scm
+++ b/z.scm
@@ -161,7 +161,10 @@
               (dict.update
                *tags*
                tag
-               (/. ids (cons id ids))))))))
+               (/. ids
+                   (if (contains? ids id)
+                       ids
+                       (cons id ids)))))))))
 
 (define (reindex)
   (set! *titles* (dict.empty))
-- 
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