aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Ms.hs
blob: 5dd225e194e926bc56e71d3f014ee58855aaeb30 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
{-
Copyright (C) 2007-2017 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) 2007-2017 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' . blockListToMs opts)
              (fmap render' . 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 = 2 + (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] 3" $$ first'
  let rest''  = if null rest
                   then empty
                   else text ".RS 3" $$ rest' $$ text ".RE"
  return (first'' $$ rest'')
bulletListItemToMs opts (first:rest) = do
  first' <- blockToMs opts first
  rest' <- blockListToMs opts rest
  return $ text "\\[bu] .RS 3" $$ first' $$ 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) $$ first'
  let rest''  = if null rest
                   then empty
                   else text ".RS " <> text (show indent) $$
                         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