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|
{-
Copyright (C) 2007-2015 John MacFarlane <jgm@berkeley.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Writers.Ms
Copyright : Copyright (C) 2007-2015 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of 'Pandoc' documents to groff ms format.
TODO:
[ ] use base URL to construct absolute URLs from relative ones for external
links
[ ] is there a better way to do strikeout?
[ ] tight/loose list distinction
-}
module Text.Pandoc.Writers.Ms ( writeMs ) where
import Text.Pandoc.Definition
import Text.Pandoc.Templates
import Text.Pandoc.Shared
import Text.Pandoc.Writers.Shared
import Text.Pandoc.Options
import Text.Pandoc.Writers.Math
import Text.Printf ( printf )
import qualified Data.Text as T
import qualified Data.Map as Map
import Data.Maybe ( catMaybes, fromMaybe )
import Data.List ( intersperse, intercalate, sort )
import Text.Pandoc.Pretty
import Text.Pandoc.Class (PandocMonad, report)
import Text.Pandoc.ImageSize
import Text.Pandoc.Logging
import Control.Monad.State
import Data.Char ( isLower, isUpper, toUpper )
import Text.TeXMath (writeEqn)
import System.FilePath (takeExtension)
import Skylighting
import Text.Pandoc.Highlighting
import Network.URI (escapeURIString, isAllowedInURI)
data WriterState = WriterState { stHasInlineMath :: Bool
, stFirstPara :: Bool
, stNotes :: [Note]
, stSmallCaps :: Bool
, stHighlighting :: Bool
, stFontFeatures :: Map.Map Char Bool
}
defaultWriterState :: WriterState
defaultWriterState = WriterState{ stHasInlineMath = False
, stFirstPara = True
, stNotes = []
, stSmallCaps = False
, stHighlighting = False
, stFontFeatures = Map.fromList [
('I',False)
, ('B',False)
, ('C',False)
]
}
type Note = [Block]
type MS = StateT WriterState
-- | Convert Pandoc to Ms.
writeMs :: PandocMonad m => WriterOptions -> Pandoc -> m String
writeMs opts document =
evalStateT (pandocToMs opts document) defaultWriterState
-- | Return groff ms representation of document.
pandocToMs :: PandocMonad m => WriterOptions -> Pandoc -> MS m String
pandocToMs opts (Pandoc meta blocks) = do
let colwidth = if writerWrapText opts == WrapAuto
then Just $ writerColumns opts
else Nothing
let render' = render colwidth
metadata <- metaToJSON opts
(fmap (render colwidth) . blockListToMs opts)
(fmap (render colwidth) . inlineListToMs' opts)
meta
body <- blockListToMs opts blocks
let main = render' body
hasInlineMath <- gets stHasInlineMath
let titleMeta = (escapeString . stringify) $ docTitle meta
let authorsMeta = map (escapeString . stringify) $ docAuthors meta
hasHighlighting <- gets stHighlighting
let highlightingMacros = if hasHighlighting
then case writerHighlightStyle opts of
Nothing -> ""
Just sty -> render' $ styleToMs sty
else ""
let context = defField "body" main
$ defField "has-inline-math" hasInlineMath
$ defField "hyphenate" True
$ defField "pandoc-version" pandocVersion
$ defField "toc" (writerTableOfContents opts)
$ defField "title-meta" titleMeta
$ defField "author-meta" (intercalate "; " authorsMeta)
$ defField "highlighting-macros" highlightingMacros
$ metadata
case writerTemplate opts of
Nothing -> return main
Just tpl -> return $ renderTemplate' tpl context
-- | Association list of characters to escape.
msEscapes :: Map.Map Char String
msEscapes = Map.fromList $
[ ('\160', "\\~")
, ('\'', "\\[aq]")
, ('`', "\\`")
, ('\8217', "'")
, ('"', "\\[dq]")
, ('\x2014', "\\[em]")
, ('\x2013', "\\[en]")
, ('\x2026', "\\&...")
, ('~', "\\[ti]")
, ('^', "\\[ha]")
, ('-', "\\-")
, ('@', "\\@")
, ('\\', "\\\\")
]
escapeChar :: Char -> String
escapeChar c = case Map.lookup c msEscapes of
Just s -> s
Nothing -> [c]
-- | Escape | character, used to mark inline math, inside math.
escapeBar :: String -> String
escapeBar = concatMap go
where go '|' = "\\[u007C]"
go c = [c]
-- | Escape special characters for Ms.
escapeString :: String -> String
escapeString = concatMap escapeChar
escapeUri :: String -> String
escapeUri = escapeURIString (\c -> c /= '@' && isAllowedInURI c)
toSmallCaps :: String -> String
toSmallCaps [] = []
toSmallCaps (c:cs)
| isLower c = let (lowers,rest) = span isLower (c:cs)
in "\\s-2" ++ escapeString (map toUpper lowers) ++
"\\s0" ++ toSmallCaps rest
| isUpper c = let (uppers,rest) = span isUpper (c:cs)
in escapeString uppers ++ toSmallCaps rest
| otherwise = escapeChar c ++ toSmallCaps cs
-- | Escape a literal (code) section for Ms.
escapeCode :: String -> String
escapeCode = concat . intersperse "\n" . map escapeLine . lines
where escapeCodeChar ' ' = "\\ "
escapeCodeChar '\t' = "\\\t"
escapeCodeChar c = escapeChar c
escapeLine codeline =
case concatMap escapeCodeChar codeline of
a@('.':_) -> "\\&" ++ a
b -> b
-- We split inline lists into sentences, and print one sentence per
-- line. groff/troff treats the line-ending period differently.
-- See http://code.google.com/p/pandoc/issues/detail?id=148.
-- | Returns the first sentence in a list of inlines, and the rest.
breakSentence :: [Inline] -> ([Inline], [Inline])
breakSentence [] = ([],[])
breakSentence xs =
let isSentenceEndInline (Str ys@(_:_)) | last ys == '.' = True
isSentenceEndInline (Str ys@(_:_)) | last ys == '?' = True
isSentenceEndInline (LineBreak) = True
isSentenceEndInline _ = False
(as, bs) = break isSentenceEndInline xs
in case bs of
[] -> (as, [])
[c] -> (as ++ [c], [])
(c:Space:cs) -> (as ++ [c], cs)
(c:SoftBreak:cs) -> (as ++ [c], cs)
(Str ".":Str (')':ys):cs) -> (as ++ [Str ".", Str (')':ys)], cs)
(x@(Str ('.':')':_)):cs) -> (as ++ [x], cs)
(LineBreak:x@(Str ('.':_)):cs) -> (as ++[LineBreak], x:cs)
(c:cs) -> (as ++ [c] ++ ds, es)
where (ds, es) = breakSentence cs
-- | Split a list of inlines into sentences.
splitSentences :: [Inline] -> [[Inline]]
splitSentences xs =
let (sent, rest) = breakSentence xs
in if null rest then [sent] else sent : splitSentences rest
blockToMs :: PandocMonad m
=> WriterOptions -- ^ Options
-> Block -- ^ Block element
-> MS m Doc
blockToMs _ Null = return empty
blockToMs opts (Div _ bs) = do
setFirstPara
res <- blockListToMs opts bs
setFirstPara
return res
blockToMs opts (Plain inlines) =
liftM vcat $ mapM (inlineListToMs' opts) $ splitSentences inlines
blockToMs opts (Para [Image attr alt (src,_tit)])
| let ext = takeExtension src in (ext == ".ps" || ext == ".eps") = do
let (mbW,mbH) = (inPoints opts <$> dimension Width attr,
inPoints opts <$> dimension Height attr)
let sizeAttrs = case (mbW, mbH) of
(Just wp, Nothing) -> space <> doubleQuotes
(text (show (floor wp :: Int) ++ "p"))
(Just wp, Just hp) -> space <> doubleQuotes
(text (show (floor wp :: Int) ++ "p")) <>
space <>
doubleQuotes (text (show (floor hp :: Int)))
_ -> empty
capt <- inlineListToMs' opts alt
return $ nowrap (text ".PSPIC -C " <>
doubleQuotes (text (escapeString src)) <>
sizeAttrs) $$
text ".ce 1000" $$
capt $$
text ".ce 0"
blockToMs opts (Para inlines) = do
firstPara <- gets stFirstPara
resetFirstPara
contents <- liftM vcat $ mapM (inlineListToMs' opts) $
splitSentences inlines
return $ text (if firstPara then ".LP" else ".PP") $$ contents
blockToMs _ b@(RawBlock f str)
| f == Format "ms" = return $ text str
| otherwise = do
report $ BlockNotRendered b
return empty
blockToMs _ HorizontalRule = do
resetFirstPara
return $ text ".HLINE"
blockToMs opts (Header level (ident,classes,_) inlines) = do
setFirstPara
contents <- inlineListToMs' opts $ map breakToSpace inlines
let (heading, secnum) = if writerNumberSections opts &&
"unnumbered" `notElem` classes
then (".NH", "\\*[SN]")
else (".SH", "")
let anchor = if null ident
then empty
else nowrap $
text ".pdfhref M " <> doubleQuotes (text ident)
let bookmark = text ".pdfhref O " <> text (show level ++ " ") <>
doubleQuotes (text $ secnum ++
(if null secnum
then ""
else " ") ++
escapeString (stringify inlines))
let backlink = nowrap (text ".pdfhref L -D " <>
doubleQuotes (text ident) <> space <> text "\\") <> cr <>
text " -- "
let tocEntry = if writerTableOfContents opts &&
level <= writerTOCDepth opts
then text ".XS"
$$ backlink <> doubleQuotes (
nowrap ((text (replicate level '\t') <>
(if null secnum
then empty
else text secnum <> text "\\~\\~")
<> contents)))
$$ text ".XE"
else empty
modify $ \st -> st{ stFirstPara = True }
return $ (text heading <> space <> text (show level)) $$
contents $$
bookmark $$
anchor $$
tocEntry
blockToMs opts (CodeBlock attr str) = do
hlCode <- highlightCode opts attr str
setFirstPara
return $
text ".IP" $$
text ".nf" $$
text "\\f[C]" $$
hlCode $$
text "\\f[]" $$
text ".fi"
blockToMs opts (LineBlock ls) = do
resetFirstPara
blockToMs opts $ Para $ intercalate [LineBreak] ls
blockToMs opts (BlockQuote blocks) = do
setFirstPara
contents <- blockListToMs opts blocks
setFirstPara
return $ text ".RS" $$ contents $$ text ".RE"
blockToMs opts (Table caption alignments widths headers rows) =
let aligncode AlignLeft = "l"
aligncode AlignRight = "r"
aligncode AlignCenter = "c"
aligncode AlignDefault = "l"
in do
caption' <- inlineListToMs' opts caption
let iwidths = if all (== 0) widths
then repeat ""
else map (printf "w(%0.1fn)" . (70 *)) widths
-- 78n default width - 8n indent = 70n
let coldescriptions = text $ intercalate " "
(zipWith (\align width -> aligncode align ++ width)
alignments iwidths) ++ "."
colheadings <- mapM (blockListToMs opts) headers
let makeRow cols = text "T{" $$
(vcat $ intersperse (text "T}\tT{") cols) $$
text "T}"
let colheadings' = if all null headers
then empty
else makeRow colheadings $$ char '_'
body <- mapM (\row -> do
cols <- mapM (blockListToMs opts) row
return $ makeRow cols) rows
setFirstPara
return $ text ".PP" $$ caption' $$
text ".TS" $$ text "delim(@@) tab(\t);" $$ coldescriptions $$
colheadings' $$ vcat body $$ text ".TE"
blockToMs opts (BulletList items) = do
contents <- mapM (bulletListItemToMs opts) items
setFirstPara
return (vcat contents)
blockToMs opts (OrderedList attribs items) = do
let markers = take (length items) $ orderedListMarkers attribs
let indent = 1 + (maximum $ map length markers)
contents <- mapM (\(num, item) -> orderedListItemToMs opts num indent item) $
zip markers items
setFirstPara
return (vcat contents)
blockToMs opts (DefinitionList items) = do
contents <- mapM (definitionListItemToMs opts) items
setFirstPara
return (vcat contents)
-- | Convert bullet list item (list of blocks) to ms.
bulletListItemToMs :: PandocMonad m => WriterOptions -> [Block] -> MS m Doc
bulletListItemToMs _ [] = return empty
bulletListItemToMs opts ((Para first):rest) =
bulletListItemToMs opts ((Plain first):rest)
bulletListItemToMs opts ((Plain first):rest) = do
first' <- blockToMs opts (Plain first)
rest' <- blockListToMs opts rest
let first'' = text ".IP \\[bu] 2" $$ first'
let rest'' = if null rest
then empty
else text ".RS 2" $$ rest' $$ text ".RE"
return (first'' $$ rest'')
bulletListItemToMs opts (first:rest) = do
first' <- blockToMs opts first
rest' <- blockListToMs opts rest
return $ text "\\[bu] .RS 2" $$ first' $$ rest' $$ text ".RE"
-- | Convert ordered list item (a list of blocks) to ms.
orderedListItemToMs :: PandocMonad m
=> WriterOptions -- ^ options
-> String -- ^ order marker for list item
-> Int -- ^ number of spaces to indent
-> [Block] -- ^ list item (list of blocks)
-> MS m Doc
orderedListItemToMs _ _ _ [] = return empty
orderedListItemToMs opts num indent ((Para first):rest) =
orderedListItemToMs opts num indent ((Plain first):rest)
orderedListItemToMs opts num indent (first:rest) = do
first' <- blockToMs opts first
rest' <- blockListToMs opts rest
let num' = printf ("%" ++ show (indent - 1) ++ "s") num
let first'' = text (".IP \"" ++ num' ++ "\" " ++ show indent) $$ first'
let rest'' = if null rest
then empty
else text ".RS 4" $$ rest' $$ text ".RE"
return $ first'' $$ rest''
-- | Convert definition list item (label, list of blocks) to ms.
definitionListItemToMs :: PandocMonad m
=> WriterOptions
-> ([Inline],[[Block]])
-> MS m Doc
definitionListItemToMs opts (label, defs) = do
labelText <- inlineListToMs' opts $ map breakToSpace label
contents <- if null defs
then return empty
else liftM vcat $ forM defs $ \blocks -> do
let (first, rest) = case blocks of
((Para x):y) -> (Plain x,y)
(x:y) -> (x,y)
[] -> error "blocks is null"
rest' <- liftM vcat $
mapM (\item -> blockToMs opts item) rest
first' <- blockToMs opts first
return $ first' $$ text ".RS" $$ rest' $$ text ".RE"
return $ nowrap (text ".IP " <> doubleQuotes labelText) $$ contents
-- | Convert list of Pandoc block elements to ms.
blockListToMs :: PandocMonad m
=> WriterOptions -- ^ Options
-> [Block] -- ^ List of block elements
-> MS m Doc
blockListToMs opts blocks =
mapM (blockToMs opts) blocks >>= (return . vcat)
-- | Convert list of Pandoc inline elements to ms.
inlineListToMs :: PandocMonad m => WriterOptions -> [Inline] -> MS m Doc
-- if list starts with ., insert a zero-width character \& so it
-- won't be interpreted as markup if it falls at the beginning of a line.
inlineListToMs opts lst = hcat <$> mapM (inlineToMs opts) lst
-- This version to be used when there is no further inline content;
-- forces a note at the end.
inlineListToMs' :: PandocMonad m => WriterOptions -> [Inline] -> MS m Doc
inlineListToMs' opts lst = do
x <- hcat <$> mapM (inlineToMs opts) lst
y <- handleNotes opts empty
return $ x <> y
-- | Convert Pandoc inline element to ms.
inlineToMs :: PandocMonad m => WriterOptions -> Inline -> MS m Doc
inlineToMs opts (Span _ ils) = inlineListToMs opts ils
inlineToMs opts (Emph lst) =
withFontFeature 'I' (inlineListToMs opts lst)
inlineToMs opts (Strong lst) =
withFontFeature 'B' (inlineListToMs opts lst)
inlineToMs opts (Strikeout lst) = do
contents <- inlineListToMs opts lst
-- we use grey color instead of strikeout, which seems quite
-- hard to do in groff for arbitrary bits of text
return $ text "\\m[strikecolor]" <> contents <> text "\\m[]"
inlineToMs opts (Superscript lst) = do
contents <- inlineListToMs opts lst
return $ text "\\*{" <> contents <> text "\\*}"
inlineToMs opts (Subscript lst) = do
contents <- inlineListToMs opts lst
return $ text "\\*<" <> contents <> text "\\*>"
inlineToMs opts (SmallCaps lst) = do
-- see https://lists.gnu.org/archive/html/groff/2015-01/msg00016.html
modify $ \st -> st{ stSmallCaps = not (stSmallCaps st) }
res <- inlineListToMs opts lst
modify $ \st -> st{ stSmallCaps = not (stSmallCaps st) }
return res
inlineToMs opts (Quoted SingleQuote lst) = do
contents <- inlineListToMs opts lst
return $ char '`' <> contents <> char '\''
inlineToMs opts (Quoted DoubleQuote lst) = do
contents <- inlineListToMs opts lst
return $ text "\\[lq]" <> contents <> text "\\[rq]"
inlineToMs opts (Cite _ lst) =
inlineListToMs opts lst
inlineToMs opts (Code attr str) = do
hlCode <- highlightCode opts attr str
withFontFeature 'C' (return hlCode)
inlineToMs _ (Str str) = do
let shim = case str of
'.':_ -> afterBreak "\\&"
_ -> empty
smallcaps <- gets stSmallCaps
if smallcaps
then return $ shim <> text (toSmallCaps str)
else return $ shim <> text (escapeString str)
inlineToMs opts (Math InlineMath str) = do
modify $ \st -> st{ stHasInlineMath = True }
res <- convertMath writeEqn InlineMath str
case res of
Left il -> inlineToMs opts il
Right r -> return $ text "@" <> text (escapeBar r) <> text "@"
inlineToMs opts (Math DisplayMath str) = do
res <- convertMath writeEqn InlineMath str
case res of
Left il -> do
contents <- inlineToMs opts il
return $ cr <> text ".RS" $$ contents $$ text ".RE"
Right r -> return $
cr <> text ".EQ" $$ text (escapeBar r) $$ text ".EN"
inlineToMs _ il@(RawInline f str)
| f == Format "ms" = return $ text str
| otherwise = do
report $ InlineNotRendered il
return empty
inlineToMs _ (LineBreak) = return $ cr <> text ".br" <> cr
inlineToMs opts SoftBreak =
handleNotes opts $
case writerWrapText opts of
WrapAuto -> space
WrapNone -> space
WrapPreserve -> cr
inlineToMs opts Space = handleNotes opts space
inlineToMs opts (Link _ txt ('#':ident, _)) = do
-- internal link
contents <- inlineListToMs' opts $ map breakToSpace txt
return $ text "\\c" <> cr <> nowrap (text ".pdfhref L -D " <>
doubleQuotes (text ident) <> text " -A " <>
doubleQuotes (text "\\c") <> space <> text "\\") <> cr <>
text " -- " <> doubleQuotes (nowrap contents) <> cr <> text "\\&"
inlineToMs opts (Link _ txt (src, _)) = do
-- external link
contents <- inlineListToMs' opts $ map breakToSpace txt
return $ text "\\c" <> cr <> nowrap (text ".pdfhref W -D " <>
doubleQuotes (text (escapeUri src)) <> text " -A " <>
doubleQuotes (text "\\c") <> space <> text "\\") <> cr <>
text " -- " <> doubleQuotes (nowrap contents) <> cr <> text "\\&"
inlineToMs _ (Image _ alternate (_, _)) =
return $ char '[' <> text "IMAGE: " <>
text (escapeString (stringify alternate)) <> char ']'
inlineToMs _ (Note contents) = do
modify $ \st -> st{ stNotes = contents : stNotes st }
return $ text "\\**"
handleNotes :: PandocMonad m => WriterOptions -> Doc -> MS m Doc
handleNotes opts fallback = do
notes <- gets stNotes
if null notes
then return fallback
else do
modify $ \st -> st{ stNotes = [] }
res <- vcat <$> mapM (handleNote opts) notes
return res
handleNote :: PandocMonad m => WriterOptions -> Note -> MS m Doc
handleNote opts bs = do
-- don't start with Paragraph or we'll get a spurious blank
-- line after the note ref:
let bs' = case bs of
(Para ils : rest) -> Plain ils : rest
_ -> bs
contents <- blockListToMs opts bs'
return $ cr <> text ".FS" $$ contents $$ text ".FE" <> cr
fontChange :: PandocMonad m => MS m Doc
fontChange = do
features <- gets stFontFeatures
let filling = sort [c | (c,True) <- Map.toList features]
return $ text $ "\\f[" ++ filling ++ "]"
withFontFeature :: PandocMonad m => Char -> MS m Doc -> MS m Doc
withFontFeature c action = do
modify $ \st -> st{ stFontFeatures = Map.adjust not c $ stFontFeatures st }
begin <- fontChange
d <- action
modify $ \st -> st{ stFontFeatures = Map.adjust not c $ stFontFeatures st }
end <- fontChange
return $ begin <> d <> end
setFirstPara :: PandocMonad m => MS m ()
setFirstPara = modify $ \st -> st{ stFirstPara = True }
resetFirstPara :: PandocMonad m => MS m ()
resetFirstPara = modify $ \st -> st{ stFirstPara = False }
breakToSpace :: Inline -> Inline
breakToSpace SoftBreak = Space
breakToSpace LineBreak = Space
breakToSpace x = x
-- Highlighting
styleToMs :: Style -> Doc
styleToMs sty = vcat $ colordefs ++ map (toMacro sty) alltoktypes
where alltoktypes = enumFromTo KeywordTok NormalTok
colordefs = map toColorDef allcolors
toColorDef c = text (".defcolor " ++
hexColor c ++ " rgb #" ++ hexColor c)
allcolors = catMaybes $ ordNub $
[defaultColor sty, backgroundColor sty,
lineNumberColor sty, lineNumberBackgroundColor sty] ++
concatMap colorsForToken (map snd (tokenStyles sty))
colorsForToken ts = [tokenColor ts, tokenBackground ts]
hexColor :: Color -> String
hexColor (RGB r g b) = printf "%02x%02x%02x" r g b
toMacro :: Style -> TokenType -> Doc
toMacro sty toktype =
nowrap (text ".ds " <> text (show toktype) <> text " " <>
setbg <> setcolor <> setfont <>
text "\\\\$1" <>
resetfont <> resetcolor <> resetbg)
where setcolor = maybe empty fgcol tokCol
resetcolor = maybe empty (const $ text "\\\\m[]") tokCol
setbg = empty -- maybe empty bgcol tokBg
resetbg = empty -- maybe empty (const $ text "\\\\M[]") tokBg
fgcol c = text $ "\\\\m[" ++ hexColor c ++ "]"
-- bgcol c = text $ "\\\\M[" ++ hexColor c ++ "]"
setfont = if tokBold || tokItalic
then text $ "\\\\f[C" ++ ['B' | tokBold] ++
['I' | tokItalic] ++ "]"
else empty
resetfont = if tokBold || tokItalic
then text "\\\\f[C]"
else empty
tokSty = lookup toktype (tokenStyles sty)
tokCol = (tokSty >>= tokenColor) `mplus` defaultColor sty
-- tokBg = (tokSty >>= tokenBackground) `mplus` backgroundColor sty
tokBold = fromMaybe False (tokenBold <$> tokSty)
tokItalic = fromMaybe False (tokenItalic <$> tokSty)
-- tokUnderline = fromMaybe False (tokSty >>= tokUnderline)
-- lnColor = lineNumberColor sty
-- lnBkgColor = lineNumberBackgroundColor sty
msFormatter :: FormatOptions -> [SourceLine] -> Doc
msFormatter _fmtopts =
vcat . map fmtLine
where fmtLine = hcat . map fmtToken
fmtToken (toktype, tok) = text "\\*" <>
brackets (text (show toktype) <> text " \""
<> text (escapeCode (T.unpack tok)) <> text "\"")
highlightCode :: PandocMonad m => WriterOptions -> Attr -> String -> MS m Doc
highlightCode opts attr str =
case highlight (writerSyntaxMap opts) msFormatter attr str of
Left msg -> do
unless (null msg) $ report $ CouldNotHighlight msg
return $ text (escapeCode str)
Right h -> do
modify (\st -> st{ stHighlighting = True })
return h
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