Revert "EPUB writer: stylesheet changes. Closes #2040."

This reverts commit 1c2951dfd9ee72e5270cb974a06098adb9178f89.

See #2040.

The semantics was too squishy.  `--css` takes a URL, but
for EPUB we need files that we can read.  I prefer keeping
the old system for now, with `--epub-stylesheet`.

1 files changed, 18 insertions, 26 deletions

diff --git a/src/Text/Pandoc/Writers/EPUB.hs b/src/Text/Pandoc/Writers/EPUB.hs
index f35d2d245..37c285dc2 100644
--- a/src/Text/Pandoc/Writers/EPUB.hs
+++ b/src/Text/Pandoc/Writers/EPUB.hs
@@ -99,7 +99,7 @@ data EPUBMetadata = EPUBMetadata{
   , epubPageDirection      :: Maybe ProgressionDirection
   } deriving Show
 
-data Stylesheet = StylesheetPaths [FilePath]
+data Stylesheet = StylesheetPath FilePath
                 | StylesheetContents String
                 deriving Show
 
@@ -323,14 +323,8 @@ metadataFromMeta opts meta = EPUBMetadata{
         coverImage = lookup "epub-cover-image" (writerVariables opts) `mplus`
              (metaValueToString <$> lookupMeta "cover-image" meta)
         stylesheet = (StylesheetContents <$> writerEpubStylesheet opts) `mplus`
-                     (case lookupMeta "stylesheet" meta of
-                         Just (MetaBlocks [CodeBlock (_,["css"],_) code])
-                                -> Just (StylesheetContents code)
-                         Just x -> Just (StylesheetPaths [metaValueToString x])
-                         Nothing -> Nothing) `mplus`
-                     (case [x | ("css", x) <- writerVariables opts] of
-                           []   -> Nothing
-                           xs   -> Just (StylesheetPaths xs))
+                     ((StylesheetPath . metaValueToString) <$>
+                       lookupMeta "stylesheet" meta)
         pageDirection = case map toLower . metaValueToString <$>
                              lookupMeta "page-progression-direction" meta of
                               Just "ltr" -> Just LTR
@@ -346,21 +340,20 @@ writeEPUB opts doc@(Pandoc meta _) = do
   let epub3 = version == EPUB3
   epochtime <- floor `fmap` getPOSIXTime
   let mkEntry path content = toEntry path epochtime content
-  let vars = ("epub3", if epub3 then "true" else "false") :
-             writerVariables opts
-  let opts'' = opts{ writerEmailObfuscation = NoObfuscation
-                   , writerStandalone = True
-                   , writerSectionDivs = True
-                   , writerHtml5 = epub3
-                   , writerVariables = vars
-                   , writerHTMLMathMethod =
-                        if epub3
-                           then MathML Nothing
-                           else writerHTMLMathMethod opts
-                   , writerWrapText = True }
-  metadata <- getEPUBMetadata opts'' meta
-  let opts' = opts''{ writerVariables = ("css", "stylesheet.css") :
-                      filter (\(x,_) -> x /= "css") vars }
+  let vars = ("epub3", if epub3 then "true" else "false")
+           : ("css", "stylesheet.css")
+           : writerVariables opts
+  let opts' = opts{ writerEmailObfuscation = NoObfuscation
+                  , writerStandalone = True
+                  , writerSectionDivs = True
+                  , writerHtml5 = epub3
+                  , writerVariables = vars
+                  , writerHTMLMathMethod =
+                       if epub3
+                          then MathML Nothing
+                          else writerHTMLMathMethod opts
+                  , writerWrapText = True }
+  metadata <- getEPUBMetadata opts' meta
 
   -- cover page
   (cpgEntry, cpicEntry) <-
@@ -682,8 +675,7 @@ writeEPUB opts doc@(Pandoc meta _) = do
 
   -- stylesheet
   stylesheet <- case epubStylesheet metadata of
-                   Just (StylesheetPaths fp)   -> concat <$>
-                                                  mapM UTF8.readFile fp
+                   Just (StylesheetPath fp)    -> UTF8.readFile fp
                    Just (StylesheetContents s) -> return s
                    Nothing -> UTF8.toString `fmap`
                               readDataFile (writerUserDataDir opts) "epub.css"