aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Writers/DokuWiki.hs
blob: 94f3a02ccef9a186b327fde0d7980e74ad2c7c70 (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
{-
Copyright (C) 2008-2015 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.DokuWiki
   Copyright   : Copyright (C) 2008-2015 John MacFarlane
   License     : GNU GPL, version 2 or above

   Maintainer  : Clare Macrae <clare.macrae@googlemail.com>
   Stability   : alpha
   Portability : portable

Conversion of 'Pandoc' documents to DokuWiki markup.

DokuWiki:  <https://www.dokuwiki.org/dokuwiki>
-}

{-
    [ ] Implement nested blockquotes (currently only ever does one level)
    [x] Implement alignment of text in tables
    [ ] Implement comments
    [ ] Work through the Dokuwiki spec, and check I've not missed anything out
    [ ] Remove dud/duplicate code
-}

module Text.Pandoc.Writers.DokuWiki ( writeDokuWiki ) where
import Text.Pandoc.Definition
import Text.Pandoc.Options ( WriterOptions(
                                writerTableOfContents
                              , writerStandalone
                              , writerTemplate) )
import Text.Pandoc.Shared ( escapeURI, removeFormatting, camelCaseToHyphenated
                          , trimr, normalize, substitute  )
import Text.Pandoc.Writers.Shared ( defField, metaToJSON )
import Text.Pandoc.Templates ( renderTemplate' )
import Data.List ( intersect, intercalate, isPrefixOf, transpose )
import Data.Default (Default(..))
import Network.URI ( isURI )
import Control.Monad ( zipWithM )
import Control.Monad.State ( modify, State, get, evalState )
import Control.Monad.Reader ( ReaderT, runReaderT, ask, local )
import Control.Applicative ( (<$>) )

data WriterState = WriterState {
    stNotes     :: Bool            -- True if there are notes
  }

data WriterEnvironment = WriterEnvironment {
    stIndent    :: String          -- Indent after the marker at the beginning of list items
  , stUseTags   :: Bool            -- True if we should use HTML tags because we're in a complex list
  , stBackSlashLB :: Bool     -- True if we should produce formatted strings with newlines (as in a table cell)
  }

instance Default WriterState where
  def = WriterState { stNotes = False }

instance Default WriterEnvironment where
  def = WriterEnvironment { stIndent = ""
                          , stUseTags = False
                          , stBackSlashLB = False }

type DokuWiki = ReaderT WriterEnvironment (State WriterState)

-- | Convert Pandoc to DokuWiki.
writeDokuWiki :: WriterOptions -> Pandoc -> String
writeDokuWiki opts document =
  runDokuWiki (pandocToDokuWiki opts $ normalize document)

runDokuWiki :: DokuWiki a -> a
runDokuWiki = flip evalState def . flip runReaderT def

-- | Return DokuWiki representation of document.
pandocToDokuWiki :: WriterOptions -> Pandoc -> DokuWiki String
pandocToDokuWiki opts (Pandoc meta blocks) = do
  metadata <- metaToJSON opts
              (fmap trimr . blockListToDokuWiki opts)
              (inlineListToDokuWiki opts)
              meta
  body <- blockListToDokuWiki opts blocks
  notesExist <- stNotes <$> get
  let notes = if notesExist
                 then "" -- TODO Was "\n<references />" Check whether I can really remove this:
                         -- if it is definitely to do with footnotes, can remove this whole bit
                 else ""
  let main = body ++ notes
  let context = defField "body" main
                $ defField "toc" (writerTableOfContents opts)
                $ metadata
  if writerStandalone opts
     then return $ renderTemplate' (writerTemplate opts) context
     else return main

-- | Escape special characters for DokuWiki.
escapeString :: String -> String
escapeString = substitute "__" "%%__%%" .
               substitute "**" "%%**%%" .
               substitute "//" "%%//%%"

-- | Convert Pandoc block element to DokuWiki.
blockToDokuWiki :: WriterOptions -- ^ Options
                -> Block         -- ^ Block element
                -> DokuWiki String

blockToDokuWiki _ Null = return ""

blockToDokuWiki opts (Div _attrs bs) = do
  contents <- blockListToDokuWiki opts bs
  return $ contents ++ "\n"

blockToDokuWiki opts (Plain inlines) =
  inlineListToDokuWiki opts inlines

-- title beginning with fig: indicates that the image is a figure
-- dokuwiki doesn't support captions - so combine together alt and caption into alt
blockToDokuWiki opts (Para [Image txt (src,'f':'i':'g':':':tit)]) = do
  capt <- if null txt
             then return ""
             else (" " ++) `fmap` inlineListToDokuWiki opts txt
  let opt = if null txt
               then ""
               else "|" ++ if null tit then capt else tit ++ capt
      -- Relative links fail isURI and receive a colon
      prefix = if isURI src then "" else ":"
  return $ "{{" ++ prefix ++ src ++ opt ++ "}}\n"

blockToDokuWiki opts (Para inlines) = do
  indent <- stIndent <$> ask
  useTags <- stUseTags <$> ask
  contents <- inlineListToDokuWiki opts inlines
  return $ if useTags
              then "<HTML><p></HTML>" ++ contents ++ "<HTML></p></HTML>"
              else contents ++ if null indent then "\n" else ""

blockToDokuWiki _ (RawBlock f str)
  | f == Format "dokuwiki" = return str
  -- See https://www.dokuwiki.org/wiki:syntax
  -- use uppercase HTML tag for block-level content:
  | f == Format "html"     = return $ "<HTML>\n" ++ str ++ "\n</HTML>"
  | otherwise              = return ""

blockToDokuWiki _ HorizontalRule = return "\n----\n"

blockToDokuWiki opts (Header level _ inlines) = do
  -- emphasis, links etc. not allowed in headers, apparently,
  -- so we remove formatting:
  contents <- inlineListToDokuWiki opts $ removeFormatting inlines
  let eqs = replicate ( 7 - level ) '='
  return $ eqs ++ " " ++ contents ++ " " ++ eqs ++ "\n"

blockToDokuWiki _ (CodeBlock (_,classes,_) str) = do
  let at  = classes `intersect` ["actionscript", "ada", "apache", "applescript", "asm", "asp",
                       "autoit", "bash", "blitzbasic", "bnf", "c", "c_mac", "caddcl", "cadlisp", "cfdg", "cfm",
                       "cpp", "cpp-qt", "csharp", "css", "d", "delphi", "diff", "div", "dos", "eiffel", "fortran",
                       "freebasic", "gml", "groovy", "html4strict", "idl", "ini", "inno", "io", "java", "java5",
                       "javascript", "latex", "lisp", "lua", "matlab", "mirc", "mpasm", "mysql", "nsis", "objc",
                       "ocaml", "ocaml-brief", "oobas", "oracle8", "pascal", "perl", "php", "php-brief", "plsql",
                       "python", "qbasic", "rails", "reg", "robots", "ruby", "sas", "scheme", "sdlbasic",
                       "smalltalk", "smarty", "sql", "tcl", "", "thinbasic", "tsql", "vb", "vbnet", "vhdl",
                       "visualfoxpro", "winbatch", "xml", "xpp", "z80"]
  let (beg, end) = if null at
                      then ("<code" ++ if null classes then ">" else " class=\"" ++ unwords classes ++ "\">", "</code>")
                      else ("<source lang=\"" ++ head at ++ "\">", "</source>")
  return $ beg ++ str ++ end

blockToDokuWiki opts (BlockQuote blocks) = do
  contents <- blockListToDokuWiki opts blocks
  if isSimpleBlockQuote blocks
     then return $ unlines $ map ("> " ++) $ lines contents
     else return $ "<HTML><blockquote>\n" ++ contents ++ "</blockquote></HTML>"

blockToDokuWiki opts (Table capt aligns _ headers rows) = do
  captionDoc <- if null capt
                   then return ""
                   else do
                      c <- inlineListToDokuWiki opts capt
                      return $ "" ++ c ++ "\n"
  headers' <- if all null headers
                 then return []
                 else zipWithM (tableItemToDokuWiki opts) aligns headers
  rows' <- mapM (zipWithM (tableItemToDokuWiki opts) aligns) rows
  let widths = map (maximum . map length) $ transpose (headers':rows')
  let padTo (width, al) s =
          case (width - length s) of
               x | x > 0 ->
                 if al == AlignLeft || al == AlignDefault
                    then s ++ replicate x ' '
                    else if al == AlignRight
                            then replicate x ' ' ++ s
                            else replicate (x `div` 2) ' ' ++
                                 s ++ replicate (x - x `div` 2) ' '
                 | otherwise -> s
  let renderRow sep cells = sep ++
          intercalate sep (zipWith padTo (zip widths aligns) cells) ++ sep
  return $ captionDoc ++
           (if null headers' then "" else renderRow "^" headers' ++ "\n") ++
           unlines (map (renderRow "|") rows')

blockToDokuWiki opts x@(BulletList items) = do
  oldUseTags <- stUseTags <$> ask
  indent <- stIndent <$> ask
  backSlash <- stBackSlashLB <$> ask
  let useTags = oldUseTags || not (isSimpleList x)
  if useTags
     then do
        contents <- local (\s -> s { stUseTags = True })
                      (mapM (listItemToDokuWiki opts) items)
        return $ "<HTML><ul></HTML>\n" ++ vcat contents ++ "<HTML></ul></HTML>\n"
     else do
        contents <- local (\s -> s { stIndent = stIndent s ++ "  "
                                   , stBackSlashLB = backSlash})
                      (mapM (listItemToDokuWiki opts) items)
        return $ vcat contents ++ if null indent then "\n" else ""

blockToDokuWiki opts x@(OrderedList attribs items) = do
  oldUseTags <- stUseTags <$> ask
  indent <- stIndent <$> ask
  backSlash <- stBackSlashLB <$> ask
  let useTags = oldUseTags || not (isSimpleList x)
  if useTags
     then do
        contents <- local (\s -> s { stUseTags = True })
                      (mapM (orderedListItemToDokuWiki opts) items)
        return $ "<HTML><ol" ++ listAttribsToString attribs ++ "></HTML>\n" ++ vcat contents ++ "<HTML></ol></HTML>\n"
     else do
        contents <- local (\s -> s { stIndent = stIndent s ++ "  "
                                   , stBackSlashLB = backSlash})
                      (mapM (orderedListItemToDokuWiki opts) items)
        return $ vcat contents ++ if null indent then "\n" else ""

-- TODO Need to decide how to make definition lists work on dokuwiki - I don't think there
--      is a specific representation of them.
-- TODO This creates double '; ; ' if there is a bullet or ordered list inside a definition list
blockToDokuWiki opts x@(DefinitionList items) = do
  oldUseTags <- stUseTags <$> ask
  indent <- stIndent <$> ask
  backSlash <- stBackSlashLB <$> ask
  let useTags = oldUseTags || not (isSimpleList x)
  if useTags
     then do
        contents <- local (\s -> s { stUseTags = True })
                      (mapM (definitionListItemToDokuWiki opts) items)
        return $ "<HTML><dl></HTML>\n" ++ vcat contents ++ "<HTML></dl></HTML>\n"
     else do
        contents <- local (\s -> s { stIndent = stIndent s ++ "  "
                                   , stBackSlashLB = backSlash})
                      (mapM (definitionListItemToDokuWiki opts) items)
        return $ vcat contents ++ if null indent then "\n" else ""

-- Auxiliary functions for lists:

-- | Convert ordered list attributes to HTML attribute string
listAttribsToString :: ListAttributes -> String
listAttribsToString (startnum, numstyle, _) =
  let numstyle' = camelCaseToHyphenated $ show numstyle
  in  (if startnum /= 1
          then " start=\"" ++ show startnum ++ "\""
          else "") ++
      (if numstyle /= DefaultStyle
          then " style=\"list-style-type: " ++ numstyle' ++ ";\""
          else "")

-- | Convert bullet list item (list of blocks) to DokuWiki.
listItemToDokuWiki :: WriterOptions -> [Block] -> DokuWiki String
listItemToDokuWiki opts items = do
  contents <- blockListToDokuWiki opts items
  useTags <- stUseTags <$> ask
  if useTags
     then return $ "<HTML><li></HTML>" ++ contents ++ "<HTML></li></HTML>"
     else do
       indent <- stIndent <$> ask
       backSlash <- stBackSlashLB <$> ask
       let indent' = if backSlash then (drop 2 indent) else indent
       return $ indent' ++ "* " ++ contents

-- | Convert ordered list item (list of blocks) to DokuWiki.
-- | TODO Emiminate dreadful duplication of text from listItemToDokuWiki
orderedListItemToDokuWiki :: WriterOptions -> [Block] -> DokuWiki String
orderedListItemToDokuWiki opts items = do
  contents <- blockListToDokuWiki opts items
  useTags <- stUseTags <$> ask
  if useTags
     then return $ "<HTML><li></HTML>" ++ contents ++ "<HTML></li></HTML>"
     else do
       indent <- stIndent <$> ask
       backSlash <- stBackSlashLB <$> ask
       let indent' = if backSlash then (drop 2 indent) else indent
       return $ indent' ++ "- " ++ contents

-- | Convert definition list item (label, list of blocks) to DokuWiki.
definitionListItemToDokuWiki :: WriterOptions
                             -> ([Inline],[[Block]])
                             -> DokuWiki String
definitionListItemToDokuWiki opts (label, items) = do
  labelText <- inlineListToDokuWiki opts label
  contents <- mapM (blockListToDokuWiki opts) items
  useTags <- stUseTags <$> ask
  if useTags
     then return $ "<HTML><dt></HTML>" ++ labelText ++ "<HTML></dt></HTML>\n" ++
           (intercalate "\n" $ map (\d -> "<HTML><dd></HTML>" ++ d ++ "<HTML></dd></HTML>") contents)
     else do
       indent <- stIndent <$> ask
       backSlash <- stBackSlashLB <$> ask
       let indent' = if backSlash then (drop 2 indent) else indent
       return $ indent' ++ "* **" ++ labelText ++ "** " ++ concat contents

-- | True if the list can be handled by simple wiki markup, False if HTML tags will be needed.
isSimpleList :: Block -> Bool
isSimpleList x =
  case x of
       BulletList items                 -> all isSimpleListItem items
       OrderedList (num, sty, _) items  -> all isSimpleListItem items &&
                                            num == 1 && sty `elem` [DefaultStyle, Decimal]
       DefinitionList items             -> all isSimpleListItem $ concatMap snd items
       _                                -> False

-- | True if list item can be handled with the simple wiki syntax.  False if
--   HTML tags will be needed.
isSimpleListItem :: [Block] -> Bool
isSimpleListItem []  = True
isSimpleListItem [x] =
  case x of
       Plain _           -> True
       Para  _           -> True
       BulletList _      -> isSimpleList x
       OrderedList _ _   -> isSimpleList x
       DefinitionList _  -> isSimpleList x
       _                 -> False
isSimpleListItem [x, y] | isPlainOrPara x =
  case y of
       BulletList _      -> isSimpleList y
       OrderedList _ _   -> isSimpleList y
       DefinitionList _  -> isSimpleList y
       _                 -> False
isSimpleListItem _ = False

isPlainOrPara :: Block -> Bool
isPlainOrPara (Plain _) = True
isPlainOrPara (Para  _) = True
isPlainOrPara _         = False

isSimpleBlockQuote :: [Block] -> Bool
isSimpleBlockQuote bs  = all isPlainOrPara bs

-- | Concatenates strings with line breaks between them.
vcat :: [String] -> String
vcat = intercalate "\n"

backSlashLineBreaks :: String -> String
backSlashLineBreaks cs = reverse $ g $ reverse $ concatMap f cs
  where f '\n' = "\\\\ "
        f c    = [c]
        g (' ' : '\\':'\\': xs) = xs
        g s = s

-- Auxiliary functions for tables:

tableItemToDokuWiki :: WriterOptions
                     -> Alignment
                     -> [Block]
                     -> DokuWiki String
tableItemToDokuWiki opts align' item = do
  let mkcell x = (if align' == AlignRight || align' == AlignCenter
                     then "  "
                     else "") ++ x ++
                 (if align' == AlignLeft || align' == AlignCenter
                     then "  "
                     else "")
  contents <- local (\s -> s { stBackSlashLB = True }) $
              blockListToDokuWiki opts item
  return $ mkcell contents

-- | Convert list of Pandoc block elements to DokuWiki.
blockListToDokuWiki :: WriterOptions -- ^ Options
                    -> [Block]       -- ^ List of block elements
                    -> DokuWiki String
blockListToDokuWiki opts blocks = do
  backSlash <- stBackSlashLB <$> ask
  if backSlash
    then (backSlashLineBreaks . vcat) <$> mapM (blockToDokuWiki opts) blocks
    else vcat <$> mapM (blockToDokuWiki opts) blocks

-- | Convert list of Pandoc inline elements to DokuWiki.
inlineListToDokuWiki :: WriterOptions -> [Inline] -> DokuWiki String
inlineListToDokuWiki opts lst =
  concat <$> (mapM (inlineToDokuWiki opts) lst)

-- | Convert Pandoc inline element to DokuWiki.
inlineToDokuWiki :: WriterOptions -> Inline -> DokuWiki String

inlineToDokuWiki opts (Span _attrs ils) =
  inlineListToDokuWiki opts ils

inlineToDokuWiki opts (Emph lst) = do
  contents <- inlineListToDokuWiki opts lst
  return $ "//" ++ contents ++ "//"

inlineToDokuWiki opts (Strong lst) = do
  contents <- inlineListToDokuWiki opts lst
  return $ "**" ++ contents ++ "**"

inlineToDokuWiki opts (Strikeout lst) = do
  contents <- inlineListToDokuWiki opts lst
  return $ "<del>" ++ contents ++ "</del>"

inlineToDokuWiki opts (Superscript lst) = do
  contents <- inlineListToDokuWiki opts lst
  return $ "<sup>" ++ contents ++ "</sup>"

inlineToDokuWiki opts (Subscript lst) = do
  contents <- inlineListToDokuWiki opts lst
  return $ "<sub>" ++ contents ++ "</sub>"

inlineToDokuWiki opts (SmallCaps lst) = inlineListToDokuWiki opts lst

inlineToDokuWiki opts (Quoted SingleQuote lst) = do
  contents <- inlineListToDokuWiki opts lst
  return $ "\8216" ++ contents ++ "\8217"

inlineToDokuWiki opts (Quoted DoubleQuote lst) = do
  contents <- inlineListToDokuWiki opts lst
  return $ "\8220" ++ contents ++ "\8221"

inlineToDokuWiki opts (Cite _  lst) = inlineListToDokuWiki opts lst

inlineToDokuWiki _ (Code _ str) =
  -- In dokuwiki, text surrounded by '' is really just a font statement, i.e. <tt>,
  -- and so other formatting can be present inside.
  -- However, in pandoc, and markdown, inlined code doesn't contain formatting.
  -- So I have opted for using %% to disable all formatting inside inline code blocks.
  -- This gives the best results when converting from other formats to dokuwiki, even if
  -- the resultand code is a little ugly, for short strings that don't contain formatting
  -- characters.
  -- It does mean that if pandoc could ever read dokuwiki, and so round-trip the format,
  -- any formatting inside inlined code blocks would be lost, or presented incorrectly.
  return $ "''%%" ++ str ++ "%%''"

inlineToDokuWiki _ (Str str) = return $ escapeString str

inlineToDokuWiki _ (Math _ str) = return $ "<math>" ++ str ++ "</math>"
                                 -- note:  str should NOT be escaped

inlineToDokuWiki _ (RawInline f str)
  | f == Format "dokuwiki" = return str
  | f == Format "html"     = return $ "<html>" ++ str ++ "</html>"
  | otherwise              = return ""

inlineToDokuWiki _ (LineBreak) = return "\\\\\n"

inlineToDokuWiki _ Space = return " "

inlineToDokuWiki opts (Link txt (src, _)) = do
  label <- inlineListToDokuWiki opts txt
  case txt of
     [Str s] | "mailto:" `isPrefixOf` src -> return $ "<" ++ s ++ ">"
             | escapeURI s == src -> return src
     _  -> if isURI src
              then return $ "[[" ++ src ++ "|" ++ label ++ "]]"
              else return $ "[[" ++ src' ++ "|" ++ label ++ "]]"
                     where src' = case src of
                                     '/':xs -> xs  -- with leading / it's a
                                     _      -> src -- link to a help page
inlineToDokuWiki opts (Image alt (source, tit)) = do
  alt' <- inlineListToDokuWiki opts alt
  let txt = case (tit, alt) of
              ("", []) -> ""
              ("", _ ) -> "|" ++ alt'
              (_ , _ ) -> "|" ++ tit
      -- Relative links fail isURI and receive a colon
      prefix = if isURI source then "" else ":"
  return $ "{{" ++ prefix ++ source ++ txt ++ "}}"

inlineToDokuWiki opts (Note contents) = do
  contents' <- blockListToDokuWiki opts contents
  modify (\s -> s { stNotes = True })
  return $ "((" ++ contents' ++ "))"
  -- note - may not work for notes with multiple blocks