Docx reader: Remove unnecessary plural functions

functions like runElemsToInlines and parPartsToInlines are just defined
in terms of concatting and mapping their singular
version (e.g. `runElemToInlines`). Having two functions with almost
identical names makes it easier to introduce errors. It's easy enough to
just concat and map inline, and it makes it clearer what is going on in
the code.

src/Text/Pandoc/Readers/Docx.hs

@@ -165,7 +165,7 @@ bodyPartsToMeta' (bp : bps)
   | (Paragraph pPr parParts) <- bp
   , (c : _)<- intersect (pStyle pPr) (M.keys metaStyles)
   , (Just metaField) <- M.lookup c metaStyles = do
-    inlines <- parPartsToInlines parParts
+    inlines <- concatReduce <$> mapM parPartToInlines parParts
     remaining <- bodyPartsToMeta' bps
     let
       f (MetaInlines ils) (MetaInlines ils') = MetaBlocks [Para ils, Para ils']
@@ -218,11 +218,8 @@ runElemToString (TextRun s) = s
 runElemToString (LnBrk) = ['\n']
 runElemToString (Tab) = ['\t']
 
-runElemsToString :: [RunElem] -> String
-runElemsToString = concatMap runElemToString
-
 runToString :: Run -> String
-runToString (Run _ runElems) = runElemsToString runElems
+runToString (Run _ runElems) = concatMap runElemToString runElems
 runToString _ = ""
 
 parPartToString :: ParPart -> String
@@ -272,7 +269,7 @@ runToInlines :: Run -> DocxContext Inlines
 runToInlines (Run rs runElems)
   | Just s <- rStyle rs
   , s `elem` codeStyles =
-    return $ code $ runElemsToString runElems
+    return $ code $ concatMap runElemToString runElems
   | otherwise = do
     let ils = concatReduce (map runElemToInlines runElems)
     return $ (runStyleToTransform rs) ils
@@ -383,9 +380,6 @@ makeHeaderAnchor' (Header n (_, classes, kvs) ils) =
     return $ Header n (newIdent, classes, kvs) ils
 makeHeaderAnchor' blk = return blk
 
-parPartsToInlines :: [ParPart] -> DocxContext Inlines
-parPartsToInlines parparts = concatReduce <$> mapM parPartToInlines parparts
-
 cellToBlocks :: Cell -> DocxContext Blocks
 cellToBlocks (Cell bps) = concatReduce <$> mapM bodyPartToBlocks bps
 
@@ -447,12 +441,12 @@ bodyPartToBlocks (Paragraph pPr parparts)
   | (c : cs) <- filter (isJust . isHeaderClass) $ pStyle pPr
   , Just n <- isHeaderClass c = do
     ils <- local (\s-> s{docxInHeaderBlock=True}) $
-           (parPartsToInlines parparts)
+           (concatReduce <$> mapM parPartToInlines parparts)
 
     makeHeaderAnchor $
       headerWith ("", delete ("Heading" ++ show n) cs, []) n ils
   | otherwise = do
-    ils <- parPartsToInlines parparts >>=
+    ils <- concatReduce <$> mapM parPartToInlines parparts >>=
            (return . fromList . trimLineBreaks . normalizeSpaces . toList)
     dropIls <- gets docxDropCap
     let ils' = dropIls <> ils