aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/Org.hs
blob: 29d58a1611653abce8a419dc6c216afa709ea81c (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
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE PatternGuards #-}
{- |
   Module      : Text.Pandoc.Writers.Org
   Copyright   : © 2010-2015 Puneeth Chaganti <punchagan@gmail.com>
                   2010-2021 John MacFarlane <jgm@berkeley.edu>
                   2016-2021 Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
   License     : GNU GPL, version 2 or above

   Maintainer  : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
   Stability   : alpha
   Portability : portable

Conversion of 'Pandoc' documents to Emacs Org-Mode.

Org-Mode:  <http://orgmode.org>
-}
module Text.Pandoc.Writers.Org (writeOrg) where
import Control.Monad.State.Strict
import Data.Char (isAlphaNum, isDigit)
import Data.List (intersect, intersperse, partition, transpose)
import Data.Text (Text)
import qualified Data.Text as T
import Text.Pandoc.Class.PandocMonad (PandocMonad, report)
import Text.Pandoc.Definition
import Text.Pandoc.Logging
import Text.Pandoc.Options
import Text.DocLayout
import Text.Pandoc.Shared
import Text.Pandoc.Templates (renderTemplate)
import Text.Pandoc.Writers.Shared

data WriterState =
  WriterState { stNotes   :: [[Block]]
              , stHasMath :: Bool
              , stOptions :: WriterOptions
              }

type Org = StateT WriterState

-- | Convert Pandoc to Org.
writeOrg :: PandocMonad m => WriterOptions -> Pandoc -> m Text
writeOrg opts document = do
  let st = WriterState { stNotes = [],
                         stHasMath = False,
                         stOptions = opts }
  evalStateT (pandocToOrg document) st

-- | Return Org representation of document.
pandocToOrg :: PandocMonad m => Pandoc -> Org m Text
pandocToOrg (Pandoc meta blocks) = do
  opts <- gets stOptions
  let colwidth = if writerWrapText opts == WrapAuto
                    then Just $ writerColumns opts
                    else Nothing
  metadata <- metaToContext opts
               blockListToOrg
               (fmap chomp . inlineListToOrg)
               meta
  body <- blockListToOrg blocks
  notes <- gets (reverse . stNotes) >>= notesToOrg
  hasMath <- gets stHasMath
  let main = body $+$ notes
  let context = defField "body" main
              . defField "math" hasMath
              $ metadata
  return $ render colwidth $
    case writerTemplate opts of
       Nothing  -> main
       Just tpl -> renderTemplate tpl context

-- | Return Org representation of notes.
notesToOrg :: PandocMonad m => [[Block]] -> Org m (Doc Text)
notesToOrg notes =
  vsep <$> zipWithM noteToOrg [1..] notes

-- | Return Org representation of a note.
noteToOrg :: PandocMonad m => Int -> [Block] -> Org m (Doc Text)
noteToOrg num note = do
  contents <- blockListToOrg note
  let marker = "[fn:" ++ show num ++ "] "
  return $ hang (length marker) (text marker) contents

-- | Escape special characters for Org.
escapeString :: Text -> Text
escapeString = escapeStringUsing
               [ ('\x2014',"---")
               , ('\x2013',"--")
               , ('\x2019',"'")
               , ('\x2026',"...")
               ]

isRawFormat :: Format -> Bool
isRawFormat f =
  f == Format "latex" || f == Format "tex" || f == Format "org"

-- | Convert Pandoc block element to Org.
blockToOrg :: PandocMonad m
           => Block         -- ^ Block element
           -> Org m (Doc Text)
blockToOrg Null = return empty
blockToOrg (Div attr bs) = divToOrg attr bs
blockToOrg (Plain inlines) = inlineListToOrg inlines
-- title beginning with fig: indicates that the image is a figure
blockToOrg (Para [Image attr txt (src,tgt)])
  | Just tit <- T.stripPrefix "fig:" tgt = do
      capt <- if null txt
              then return empty
              else ("#+caption: " <>) `fmap` inlineListToOrg txt
      img <- inlineToOrg (Image attr txt (src,tit))
      return $ capt $$ img $$ blankline
blockToOrg (Para inlines) = do
  contents <- inlineListToOrg inlines
  return $ contents <> blankline
blockToOrg (LineBlock lns) = do
  let splitStanza [] = []
      splitStanza xs = case break (== mempty) xs of
        (l, [])  -> [l]
        (l, _:r) -> l : splitStanza r
  let joinWithLinefeeds  = nowrap . mconcat . intersperse cr
  let joinWithBlankLines = mconcat . intersperse blankline
  let prettifyStanza ls  = joinWithLinefeeds <$> mapM inlineListToOrg ls
  contents <- joinWithBlankLines <$> mapM prettifyStanza (splitStanza lns)
  return $ blankline $$ "#+begin_verse" $$
           nest 2 contents $$ "#+end_verse" <> blankline
blockToOrg (RawBlock "html" str) =
  return $ blankline $$ "#+begin_html" $$
           nest 2 (literal str) $$ "#+end_html" $$ blankline
blockToOrg b@(RawBlock f str)
  | isRawFormat f = return $ literal str
  | otherwise     = do
      report $ BlockNotRendered b
      return empty
blockToOrg HorizontalRule = return $ blankline $$ "--------------" $$ blankline
blockToOrg (Header level attr inlines) = do
  contents <- inlineListToOrg inlines
  let headerStr = text $ if level > 999 then " " else replicate level '*'
  let drawerStr = if attr == nullAttr
                  then empty
                  else cr <> nest (level + 1) (propertiesDrawer attr)
  return $ headerStr <> " " <> contents <> drawerStr <> cr
blockToOrg (CodeBlock (_,classes,kvs) str) = do
  let startnum = maybe "" (\x -> " " <> trimr x) $ lookup "startFrom" kvs
  let numberlines = if "numberLines" `elem` classes
                      then if "continuedSourceBlock" `elem` classes
                             then " +n" <> startnum
                             else " -n" <> startnum
                      else ""
  let at = map pandocLangToOrg classes `intersect` orgLangIdentifiers
  let (beg, end) = case at of
                      []    -> ("#+begin_example" <> numberlines, "#+end_example")
                      (x:_) -> ("#+begin_src " <> x <> numberlines, "#+end_src")
  return $ literal beg $$ nest 2 (literal str) $$ text end $$ blankline
blockToOrg (BlockQuote blocks) = do
  contents <- blockListToOrg blocks
  return $ blankline $$ "#+begin_quote" $$
           nest 2 contents $$ "#+end_quote" $$ blankline
blockToOrg (Table _ blkCapt specs thead tbody tfoot) =  do
  let (caption', _, _, headers, rows) = toLegacyTable blkCapt specs thead tbody tfoot
  caption'' <- inlineListToOrg caption'
  let caption = if null caption'
                   then empty
                   else "#+caption: " <> caption''
  headers' <- mapM blockListToOrg headers
  rawRows <- mapM (mapM blockListToOrg) rows
  let numChars = maximum . map offset
  -- FIXME: width is not being used.
  let widthsInChars =
       map numChars $ transpose (headers' : rawRows)
  -- FIXME: Org doesn't allow blocks with height more than 1.
  let hpipeBlocks blocks = hcat [beg, middle, end]
        where sep'   = vfill " | "
              beg    = vfill "| "
              end    = vfill " |"
              middle = hcat $ intersperse sep' blocks
  let makeRow = hpipeBlocks . zipWith lblock widthsInChars
  let head' = makeRow headers'
  rows' <- mapM (\row -> do cols <- mapM blockListToOrg row
                            return $ makeRow cols) rows
  let border ch = char '|' <> char ch <>
                  (hcat . intersperse (char ch <> char '+' <> char ch) $
                          map (\l -> text $ replicate l ch) widthsInChars) <>
                  char ch <> char '|'
  let body = vcat rows'
  let head'' = if all null headers
                  then empty
                  else head' $$ border '-'
  return $ head'' $$ body $$ caption $$ blankline
blockToOrg (BulletList items) = do
  contents <- mapM bulletListItemToOrg items
  -- ensure that sublists have preceding blank line
  return $ blankline $$
           (if isTightList items then vcat else vsep) contents $$
           blankline
blockToOrg (OrderedList (start, _, delim) items) = do
  let delim' = case delim of
                    TwoParens -> OneParen
                    x         -> x
  let markers = take (length items) $ orderedListMarkers
                                      (start, Decimal, delim')
  let maxMarkerLength = maximum $ map T.length markers
  let markers' = map (\m -> let s = maxMarkerLength - T.length m
                            in  m <> T.replicate s " ") markers
  contents <- zipWithM orderedListItemToOrg markers' items
  -- ensure that sublists have preceding blank line
  return $ blankline $$
           (if isTightList items then vcat else vsep) contents $$
           blankline
blockToOrg (DefinitionList items) = do
  contents <- mapM definitionListItemToOrg items
  return $ vcat contents $$ blankline

-- | Convert bullet list item (list of blocks) to Org.
bulletListItemToOrg :: PandocMonad m => [Block] -> Org m (Doc Text)
bulletListItemToOrg items = do
  exts <- gets $ writerExtensions . stOptions
  contents <- blockListToOrg (taskListItemToOrg exts items)
  return $ hang 2 "- " contents $$
          if endsWithPlain items
             then cr
             else blankline

-- | Convert ordered list item (a list of blocks) to Org.
orderedListItemToOrg :: PandocMonad m
                     => Text   -- ^ marker for list item
                     -> [Block]  -- ^ list item (list of blocks)
                     -> Org m (Doc Text)
orderedListItemToOrg marker items = do
  exts <- gets $ writerExtensions . stOptions
  contents <- blockListToOrg (taskListItemToOrg exts items)
  return $ hang (T.length marker + 1) (literal marker <> space) contents $$
          if endsWithPlain items
             then cr
             else blankline

-- | Convert a list item containing text starting with @U+2610 BALLOT BOX@
-- or @U+2612 BALLOT BOX WITH X@ to org checkbox syntax (e.g. @[X]@).
taskListItemToOrg :: Extensions -> [Block] -> [Block]
taskListItemToOrg = handleTaskListItem toOrg
  where
    toOrg (Str "☐" : Space : is) = Str "[ ]" : Space : is
    toOrg (Str "☒" : Space : is) = Str "[X]" : Space : is
    toOrg is = is

-- | Convert definition list item (label, list of blocks) to Org.
definitionListItemToOrg :: PandocMonad m
                        => ([Inline], [[Block]]) -> Org m (Doc Text)
definitionListItemToOrg (label, defs) = do
  label' <- inlineListToOrg label
  contents <- vcat <$> mapM blockListToOrg defs
  return $ hang 2 "- " (label' <> " :: " <> contents) $$
      if isTightList defs
         then cr
         else blankline

-- | Convert list of key/value pairs to Org :PROPERTIES: drawer.
propertiesDrawer :: Attr -> Doc Text
propertiesDrawer (ident, classes, kv) =
  let
    drawerStart = text ":PROPERTIES:"
    drawerEnd   = text ":END:"
    kv'  = if classes == mempty then kv  else ("CLASS", T.unwords classes):kv
    kv'' = if ident == mempty   then kv' else ("CUSTOM_ID", ident):kv'
    properties = vcat $ map kvToOrgProperty kv''
  in
    drawerStart <> cr <> properties <> cr <> drawerEnd
 where
   kvToOrgProperty :: (Text, Text) -> Doc Text
   kvToOrgProperty (key, value) =
     text ":" <> literal key <> text ": " <> literal value <> cr

-- | The different methods to represent a Div block.
data DivBlockType
  = GreaterBlock Text Attr   -- ^ Greater block like @center@ or @quote@.
  | Drawer Text Attr         -- ^ Org drawer with of given name; keeps
                             --   key-value pairs.
  | UnwrappedWithAnchor Text -- ^ Not mapped to other type, only
                             --   identifier is retained (if any).

-- | Gives the most suitable method to render a list of blocks
-- with attributes.
divBlockType :: Attr-> DivBlockType
divBlockType (ident, classes, kvs)
  -- if any class is named "drawer", then output as org :drawer:
  | ([_], drawerName:classes') <- partition (== "drawer") classes
  = Drawer drawerName (ident, classes', kvs)
  -- if any class is either @center@ or @quote@, then use a org block.
  | (blockName:classes'', classes') <- partition isGreaterBlockClass classes
  = GreaterBlock blockName (ident, classes' <> classes'', kvs)
  -- if no better method is found, unwrap div and set anchor
  | otherwise
  = UnwrappedWithAnchor ident
 where
  isGreaterBlockClass :: Text -> Bool
  isGreaterBlockClass = (`elem` ["center", "quote"]) . T.toLower

-- | Converts a Div to an org-mode element.
divToOrg :: PandocMonad m
         => Attr -> [Block] -> Org m (Doc Text)
divToOrg attr bs = do
  contents <- blockListToOrg bs
  case divBlockType attr of
    GreaterBlock blockName attr' ->
      -- Write as greater block. The ID, if present, is added via
      -- the #+name keyword; other classes and key-value pairs
      -- are kept as #+attr_html attributes.
      return $ blankline $$ attrHtml attr'
            $$ "#+begin_" <> literal blockName
            $$ contents
            $$ "#+end_" <> literal blockName $$ blankline
    Drawer drawerName (_,_,kvs) -> do
      -- Write as drawer. Only key-value pairs are retained.
      let keys = vcat $ map (\(k,v) ->
                               ":" <> literal k <> ":"
                              <> space <> literal v) kvs
      return $ ":" <> literal drawerName <> ":" $$ cr
            $$ keys $$ blankline
            $$ contents $$ blankline
            $$ text ":END:" $$ blankline
    UnwrappedWithAnchor ident -> do
      -- Unwrap the div. All attributes are discarded, except for
      -- the identifier, which is added as an anchor before the
      -- div contents.
      let contents' = if T.null ident
                      then contents
                      else  "<<" <> literal ident <> ">>" $$ contents
      return (blankline $$ contents' $$ blankline)

attrHtml :: Attr -> Doc Text
attrHtml (""   , []     , []) = mempty
attrHtml (ident, classes, kvs) =
  let
    name = if T.null ident then mempty else "#+name: " <> literal ident <> cr
    keyword = "#+attr_html"
    classKv = ("class", T.unwords classes)
    kvStrings = map (\(k,v) -> ":" <> k <> " " <> v) (classKv:kvs)
  in name <> keyword <> ": " <> literal (T.unwords kvStrings) <> cr

-- | Convert list of Pandoc block elements to Org.
blockListToOrg :: PandocMonad m
               => [Block]       -- ^ List of block elements
               -> Org m (Doc Text)
blockListToOrg blocks = vcat <$> mapM blockToOrg blocks

-- | Convert list of Pandoc inline elements to Org.
inlineListToOrg :: PandocMonad m
                => [Inline]
                -> Org m (Doc Text)
inlineListToOrg lst = hcat <$> mapM inlineToOrg (fixMarkers lst)
  where -- Prevent note refs and list markers from wrapping, see #4171
        -- and #7132.
        fixMarkers [] = []
        fixMarkers (Space : x : rest) | shouldFix x =
          Str " " : x : fixMarkers rest
        fixMarkers (SoftBreak : x : rest) | shouldFix x =
          Str " " : x : fixMarkers rest
        fixMarkers (x : rest) = x : fixMarkers rest

        shouldFix Note{} = True    -- Prevent footnotes
        shouldFix (Str "-") = True -- Prevent bullet list items
        shouldFix (Str x)          -- Prevent ordered list items
          | Just (cs, c) <- T.unsnoc x = T.all isDigit cs &&
                                         (c == '.' || c == ')')
        shouldFix _ = False

-- | Convert Pandoc inline element to Org.
inlineToOrg :: PandocMonad m => Inline -> Org m (Doc Text)
inlineToOrg (Span (uid, [], []) []) =
  return $ "<<" <> literal uid <> ">>"
inlineToOrg (Span _ lst) =
  inlineListToOrg lst
inlineToOrg (Emph lst) = do
  contents <- inlineListToOrg lst
  return $ "/" <> contents <> "/"
inlineToOrg (Underline lst) = do
  contents <- inlineListToOrg lst
  return $ "_" <> contents <> "_"
inlineToOrg (Strong lst) = do
  contents <- inlineListToOrg lst
  return $ "*" <> contents <> "*"
inlineToOrg (Strikeout lst) = do
  contents <- inlineListToOrg lst
  return $ "+" <> contents <> "+"
inlineToOrg (Superscript lst) = do
  contents <- inlineListToOrg lst
  return $ "^{" <> contents <> "}"
inlineToOrg (Subscript lst) = do
  contents <- inlineListToOrg lst
  return $ "_{" <> contents <> "}"
inlineToOrg (SmallCaps lst) = inlineListToOrg lst
inlineToOrg (Quoted SingleQuote lst) = do
  contents <- inlineListToOrg lst
  return $ "'" <> contents <> "'"
inlineToOrg (Quoted DoubleQuote lst) = do
  contents <- inlineListToOrg lst
  return $ "\"" <> contents <> "\""
inlineToOrg (Cite _  lst) = inlineListToOrg lst
inlineToOrg (Code _ str) = return $ "=" <> literal str <> "="
inlineToOrg (Str str) = return . literal $ escapeString str
inlineToOrg (Math t str) = do
  modify $ \st -> st{ stHasMath = True }
  return $ if t == InlineMath
              then "$" <> literal str <> "$"
              else "$$" <> literal str <> "$$"
inlineToOrg il@(RawInline f str)
  | isRawFormat f = return $ literal str
  | otherwise     = do
      report $ InlineNotRendered il
      return empty
inlineToOrg LineBreak = return (text "\\\\" <> cr)
inlineToOrg Space = return space
inlineToOrg SoftBreak = do
  wrapText <- gets (writerWrapText . stOptions)
  case wrapText of
       WrapPreserve -> return cr
       WrapAuto     -> return space
       WrapNone     -> return space
inlineToOrg (Link _ txt (src, _)) =
  case txt of
        [Str x] | escapeURI x == src ->  -- autolink
             return $ "[[" <> literal (orgPath x) <> "]]"
        _ -> do contents <- inlineListToOrg txt
                return $ "[[" <> literal (orgPath src) <> "][" <> contents <> "]]"
inlineToOrg (Image _ _ (source, _)) =
  return $ "[[" <> literal (orgPath source) <> "]]"
inlineToOrg (Note contents) = do
  -- add to notes in state
  notes <- gets stNotes
  modify $ \st -> st { stNotes = contents:notes }
  let ref = tshow $ length notes + 1
  return $ "[fn:" <> literal ref <> "]"

orgPath :: Text -> Text
orgPath src = case T.uncons src of
  Nothing            -> ""             -- wiki link
  Just ('#', _)      -> src            -- internal link
  _ | isUrl src      -> src
  _ | isFilePath src -> src
  _                  -> "file:" <> src
  where
    isFilePath :: Text -> Bool
    isFilePath cs = any (`T.isPrefixOf` cs) ["/", "./", "../", "file:"]

    isUrl :: Text -> Bool
    isUrl cs =
      let (scheme, path) = T.break (== ':') cs
      in T.all (\c -> isAlphaNum c || c `elemText` ".-") scheme
         && not (T.null path)

-- | Translate from pandoc's programming language identifiers to those used by
-- org-mode.
pandocLangToOrg :: Text -> Text
pandocLangToOrg cs =
  case cs of
    "c"          -> "C"
    "commonlisp" -> "lisp"
    "r"          -> "R"
    "bash"       -> "shell"
    "lillypond"  -> "ly"
    _            -> cs

-- | List of language identifiers recognized by org-mode.
orgLangIdentifiers :: [Text]
orgLangIdentifiers =
  [ "abc", "asymptote", "awk", "axiom", "C", "cpp", "calc", "clojure","comint"
  , "coq", "css", "D", "ditaa", "dot", "ebnf", "elixir", "eukleides", "fomus"
  , "forth", "F90", "gnuplot", "Translate", "groovy", "haskell" , "browser"
  , "request", "io", "ipython", "J", "java", "js", "julia", "kotlin", "latex"
  , "ledger", "ly", "lisp", "Flavored", "makefile", "mathematica", "mathomatic"
  , "matlab", "max", "mongo", "mscgen", "cypher", "Caml", "octave" , "org", "oz"
  , "perl", "picolisp", "plantuml", "processing", "prolog", "python" , "R"
  , "rec", "ruby", "sass", "scala", "scheme", "screen", "sed", "shell", "shen"
  , "sql", "sqlite", "stan", "ML", "stata", "tcl", "typescript", "vala"
  ]