From 29749366052a8f6c05b314f1ff17201717855ad7 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Wed, 7 Oct 2020 13:08:51 +0200
Subject: Much.ParseMail.encodeWord: reference RFC 2047

---
 src/Much/ParseMail.hs | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/Much/ParseMail.hs b/src/Much/ParseMail.hs
index e12737a..d9bb733 100644
--- a/src/Much/ParseMail.hs
+++ b/src/Much/ParseMail.hs
@@ -281,11 +281,15 @@ encodedWord =
         return
             $ T.decodeUtf8
             $ BS8.pack
-            $ QP.decode
-                -- ^ TODO this current doesn't decode
-                -- underscore to space
-            $ map (\c -> if c == '_' then ' ' else c)
+            $ decodeQ
             $ w
+  where
+    -- RFC 2047, 4.2. The "Q" encoding
+    decodeQ =
+        QP.decode . replace '_' ' '
+
+    replace a b =
+        map $ \c -> if c == a then b else c
 
 
 -- word        =  encoded-word / atom / quoted-string
-- 
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