From 421ae44cdfb5d1049246d61cabf647d6056eb554 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Mon, 25 Nov 2019 17:50:27 -0800
Subject: EPUB writer: Fix regression with `--css option.

Closes #5937.
---
 src/Text/Pandoc/Writers/EPUB.hs | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/src/Text/Pandoc/Writers/EPUB.hs b/src/Text/Pandoc/Writers/EPUB.hs
index 4a1c27ce6..b3cf79ba2 100644
--- a/src/Text/Pandoc/Writers/EPUB.hs
+++ b/src/Text/Pandoc/Writers/EPUB.hs
@@ -357,8 +357,12 @@ metadataFromMeta opts meta = EPUBMetadata{
             `mplus` (metaValueToString <$> lookupMeta "cover-image" meta)
         mCss = lookupMeta "css" meta <|> lookupMeta "stylesheet" meta
         stylesheets = fromMaybe [] (metaValueToPaths <$> mCss) ++
-                      maybe [] (\t -> [TS.unpack t])
-                        (lookupContext "css" (writerVariables opts))
+                      case lookupContext "css" (writerVariables opts) of
+                         Just xs -> map TS.unpack xs
+                         Nothing ->
+                           case lookupContext "css" (writerVariables opts) of
+                             Just x  -> [TS.unpack x]
+                             Nothing -> []
         pageDirection = case map toLower . metaValueToString <$>
                              lookupMeta "page-progression-direction" meta of
                               Just "ltr" -> Just LTR
@@ -440,13 +444,13 @@ pandocToEPUB version opts doc = do
                M.insert "lang" (toVal' $ epubLanguage metadata)
              $ unContext $ writerVariables opts
 
-  let cssvars useprefix = Context $ M.fromList $ map
-                       (\e -> ("css", toVal' $
-                               (if useprefix
-                                   then "../"
-                                   else "")
-                               ++ makeRelative epubSubdir (eRelativePath e)))
-                          stylesheetEntries
+  let cssvars useprefix = Context $ M.insert "css"
+                           (ListVal $ map
+                             (\e -> toVal' $
+                                (if useprefix then "../" else "") <>
+                                makeRelative epubSubdir (eRelativePath e))
+                             stylesheetEntries)
+                             mempty
 
   let opts' = opts{ writerEmailObfuscation = NoObfuscation
                   , writerSectionDivs = True
-- 
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