From 47f435276a62b3eddac496de6a7e365631d57197 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Thu, 24 Dec 2020 09:56:20 -0800
Subject: [PATCH] Citeproc: fix handling of empty URL variables (`DOI`, etc.).
The `linkifyVariables` function was changing these to links
which then got treated as non-empty by citeproc, leading
to wrong results (e.g. ignoring nonempty URL when empty DOI is present).
Addresses part 2 of jgm/citeproc#41.
---
src/Text/Pandoc/Citeproc.hs | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/Text/Pandoc/Citeproc.hs b/src/Text/Pandoc/Citeproc.hs
index ca1ab9f96..e87ddcbcd 100644
--- a/src/Text/Pandoc/Citeproc.hs
+++ b/src/Text/Pandoc/Citeproc.hs
@@ -507,7 +507,9 @@ linkifyVariables ref =
x'' = if "://" `T.isInfixOf` x'
then x'
else pref <> x'
- in FancyVal (B.link x'' "" (B.str x'))
+ in if T.null x'
+ then x
+ else FancyVal (B.link x'' "" (B.str x'))
extractText :: Val Inlines -> Text
extractText (TextVal x) = x