Initial work to create dokuwiki writer (#386)

In this first version, all dokuwiki files are straight copies of the
media wiki counterparts.

2 files changed, 410 insertions, 0 deletions

diff --git a/src/Text/Pandoc.hs b/src/Text/Pandoc.hs
index 86e78ce53..4cebd2f75 100644
--- a/src/Text/Pandoc.hs
+++ b/src/Text/Pandoc.hs
@@ -88,6 +88,7 @@ module Text.Pandoc
                , writeOpenDocument
                , writeMan
                , writeMediaWiki
+               , writeDokuWiki
                , writeTextile
                , writeRTF
                , writeODT
@@ -137,6 +138,7 @@ import Text.Pandoc.Writers.OpenDocument
 import Text.Pandoc.Writers.Man
 import Text.Pandoc.Writers.RTF
 import Text.Pandoc.Writers.MediaWiki
+import Text.Pandoc.Writers.DokuWiki
 import Text.Pandoc.Writers.Textile
 import Text.Pandoc.Writers.Org
 import Text.Pandoc.Writers.AsciiDoc
@@ -257,6 +259,7 @@ writers = [
   ,("plain"        , PureStringWriter writePlain)
   ,("rst"          , PureStringWriter writeRST)
   ,("mediawiki"    , PureStringWriter writeMediaWiki)
+  ,("dokuwiki"     , PureStringWriter writeDokuWiki)
   ,("textile"      , PureStringWriter writeTextile)
   ,("rtf"          , IOStringWriter writeRTFWithEmbeddedImages)
   ,("org"          , PureStringWriter writeOrg)
diff --git a/src/Text/Pandoc/Writers/DokuWiki.hs b/src/Text/Pandoc/Writers/DokuWiki.hs
new file mode 100644
index 000000000..b3483adf2
--- /dev/null
+++ b/src/Text/Pandoc/Writers/DokuWiki.hs
@@ -0,0 +1,407 @@
+{-
+Copyright (C) 2008-2010 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) 2008-2010 John MacFarlane
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : John MacFarlane <jgm@berkeley.edu>
+   Stability   : alpha
+   Portability : portable
+
+Conversion of 'Pandoc' documents to DokuWiki markup.
+
+DokuWiki:  <https://www.dokuwiki.org/dokuwiki>
+-}
+module Text.Pandoc.Writers.DokuWiki ( writeDokuWiki ) where
+import Text.Pandoc.Definition
+import Text.Pandoc.Options
+import Text.Pandoc.Shared
+import Text.Pandoc.Writers.Shared
+import Text.Pandoc.Templates (renderTemplate')
+import Text.Pandoc.XML ( escapeStringForXML )
+import Data.List ( intersect, intercalate )
+import Network.URI ( isURI )
+import Control.Monad.State
+
+data WriterState = WriterState {
+    stNotes     :: Bool            -- True if there are notes
+  , stListLevel :: [Char]          -- String at beginning of list items, e.g. "**"
+  , stUseTags   :: Bool            -- True if we should use HTML tags because we're in a complex list
+  }
+
+-- | Convert Pandoc to DokuWiki.
+writeDokuWiki :: WriterOptions -> Pandoc -> String
+writeDokuWiki opts document =
+  evalState (pandocToDokuWiki opts document)
+            (WriterState { stNotes = False, stListLevel = [], stUseTags = False })
+
+-- | Return DokuWiki representation of document.
+pandocToDokuWiki :: WriterOptions -> Pandoc -> State WriterState String
+pandocToDokuWiki opts (Pandoc meta blocks) = do
+  metadata <- metaToJSON opts
+              (fmap trimr . blockListToDokuWiki opts)
+              (inlineListToDokuWiki opts)
+              meta
+  body <- blockListToDokuWiki opts blocks
+  notesExist <- get >>= return . stNotes
+  let notes = if notesExist
+                 then "\n<references />"
+                 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 =  escapeStringForXML
+
+-- | Convert Pandoc block element to DokuWiki.
+blockToDokuWiki :: WriterOptions -- ^ Options
+                -> Block         -- ^ Block element
+                -> State WriterState String
+
+blockToDokuWiki _ Null = return ""
+
+blockToDokuWiki opts (Plain inlines) =
+  inlineListToDokuWiki opts inlines
+
+-- title beginning with fig: indicates that the image is a figure
+blockToDokuWiki opts (Para [Image txt (src,'f':'i':'g':':':tit)]) = do
+  capt <- if null txt
+             then return ""
+             else ("|caption " ++) `fmap` inlineListToDokuWiki opts txt
+  let opt = if null txt
+               then ""
+               else "|alt=" ++ if null tit then capt else tit ++ capt
+  return $ "[[Image:" ++ src ++ "|frame|none" ++ opt ++ "]]\n"
+
+blockToDokuWiki opts (Para inlines) = do
+  useTags <- get >>= return . stUseTags
+  listLevel <- get >>= return . stListLevel
+  contents <- inlineListToDokuWiki opts inlines
+  return $ if useTags
+              then  "<p>" ++ contents ++ "</p>"
+              else contents ++ if null listLevel then "\n" else ""
+
+blockToDokuWiki _ (RawBlock "mediawiki" str) = return str
+blockToDokuWiki _ (RawBlock "html" str) = return str
+blockToDokuWiki _ (RawBlock _ _) = return ""
+
+blockToDokuWiki _ HorizontalRule = return "\n-----\n"
+
+blockToDokuWiki opts (Header level _ inlines) = do
+  contents <- inlineListToDokuWiki opts inlines
+  let eqs = replicate 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 ("<pre" ++ if null classes then ">" else " class=\"" ++ unwords classes ++ "\">", "</pre>")
+                      else ("<source lang=\"" ++ head at ++ "\">", "</source>")
+  return $ beg ++ escapeString str ++ end
+
+blockToDokuWiki opts (BlockQuote blocks) = do
+  contents <- blockListToDokuWiki opts blocks
+  return $ "<blockquote>" ++ contents ++ "</blockquote>"
+
+blockToDokuWiki opts (Table capt aligns widths headers rows') = do
+  let alignStrings = map alignmentToString aligns
+  captionDoc <- if null capt
+                   then return ""
+                   else do
+                      c <- inlineListToDokuWiki opts capt
+                      return $ "<caption>" ++ c ++ "</caption>\n"
+  let percent w = show (truncate (100*w) :: Integer) ++ "%"
+  let coltags = if all (== 0.0) widths
+                   then ""
+                   else unlines $ map
+                         (\w -> "<col width=\"" ++ percent w ++ "\" />") widths
+  head' <- if all null headers
+              then return ""
+              else do
+                 hs <- tableRowToDokuWiki opts alignStrings 0 headers
+                 return $ "<thead>\n" ++ hs ++ "\n</thead>\n"
+  body' <- zipWithM (tableRowToDokuWiki opts alignStrings) [1..] rows'
+  return $ "<table>\n" ++ captionDoc ++ coltags ++ head' ++
+            "<tbody>\n" ++ unlines body' ++ "</tbody>\n</table>\n"
+
+blockToDokuWiki opts x@(BulletList items) = do
+  oldUseTags <- get >>= return . stUseTags
+  listLevel <- get >>= return . stListLevel
+  let useTags = oldUseTags || not (isSimpleList x)
+  if useTags
+     then do
+        modify $ \s -> s { stUseTags = True }
+        contents <- mapM (listItemToDokuWiki opts) items
+        modify $ \s -> s { stUseTags = oldUseTags }
+        return $ "<ul>\n" ++ vcat contents ++ "</ul>\n"
+     else do
+        modify $ \s -> s { stListLevel = stListLevel s ++ "*" }
+        contents <- mapM (listItemToDokuWiki opts) items
+        modify $ \s -> s { stListLevel = init (stListLevel s) }
+        return $ vcat contents ++ if null listLevel then "\n" else ""
+
+blockToDokuWiki opts x@(OrderedList attribs items) = do
+  oldUseTags <- get >>= return . stUseTags
+  listLevel <- get >>= return . stListLevel
+  let useTags = oldUseTags || not (isSimpleList x)
+  if useTags
+     then do
+        modify $ \s -> s { stUseTags = True }
+        contents <- mapM (listItemToDokuWiki opts) items
+        modify $ \s -> s { stUseTags = oldUseTags }
+        return $ "<ol" ++ listAttribsToString attribs ++ ">\n" ++ vcat contents ++ "</ol>\n"
+     else do
+        modify $ \s -> s { stListLevel = stListLevel s ++ "#" }
+        contents <- mapM (listItemToDokuWiki opts) items
+        modify $ \s -> s { stListLevel = init (stListLevel s) }
+        return $ vcat contents ++ if null listLevel then "\n" else ""
+
+blockToDokuWiki opts x@(DefinitionList items) = do
+  oldUseTags <- get >>= return . stUseTags
+  listLevel <- get >>= return . stListLevel
+  let useTags = oldUseTags || not (isSimpleList x)
+  if useTags
+     then do
+        modify $ \s -> s { stUseTags = True }
+        contents <- mapM (definitionListItemToDokuWiki opts) items
+        modify $ \s -> s { stUseTags = oldUseTags }
+        return $ "<dl>\n" ++ vcat contents ++ "</dl>\n"
+     else do
+        modify $ \s -> s { stListLevel = stListLevel s ++ ";" }
+        contents <- mapM (definitionListItemToDokuWiki opts) items
+        modify $ \s -> s { stListLevel = init (stListLevel s) }
+        return $ vcat contents ++ if null listLevel 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 or ordered list item (list of blocks) to DokuWiki.
+listItemToDokuWiki :: WriterOptions -> [Block] -> State WriterState String
+listItemToDokuWiki opts items = do
+  contents <- blockListToDokuWiki opts items
+  useTags <- get >>= return . stUseTags
+  if useTags
+     then return $ "<li>" ++ contents ++ "</li>"
+     else do
+       marker <- get >>= return . stListLevel
+       return $ marker ++ " " ++ contents
+
+-- | Convert definition list item (label, list of blocks) to DokuWiki.
+definitionListItemToDokuWiki :: WriterOptions
+                             -> ([Inline],[[Block]])
+                             -> State WriterState String
+definitionListItemToDokuWiki opts (label, items) = do
+  labelText <- inlineListToDokuWiki opts label
+  contents <- mapM (blockListToDokuWiki opts) items
+  useTags <- get >>= return . stUseTags
+  if useTags
+     then return $ "<dt>" ++ labelText ++ "</dt>\n" ++
+           (intercalate "\n" $ map (\d -> "<dd>" ++ d ++ "</dd>") contents)
+     else do
+       marker <- get >>= return . stListLevel
+       return $ marker ++ " " ++ labelText ++ "\n" ++
+           (intercalate "\n" $ map (\d -> init marker ++ ": " ++ d) 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
+
+-- | Concatenates strings with line breaks between them.
+vcat :: [String] -> String
+vcat = intercalate "\n"
+
+-- Auxiliary functions for tables:
+
+tableRowToDokuWiki :: WriterOptions
+                    -> [String]
+                    -> Int
+                    -> [[Block]]
+                    -> State WriterState String
+tableRowToDokuWiki opts alignStrings rownum cols' = do
+  let celltype = if rownum == 0 then "th" else "td"
+  let rowclass = case rownum of
+                      0                  -> "header"
+                      x | x `rem` 2 == 1 -> "odd"
+                      _                  -> "even"
+  cols'' <- sequence $ zipWith
+            (\alignment item -> tableItemToDokuWiki opts celltype alignment item)
+            alignStrings cols'
+  return $ "<tr class=\"" ++ rowclass ++ "\">\n" ++ unlines cols'' ++ "</tr>"
+
+alignmentToString :: Alignment -> [Char]
+alignmentToString alignment = case alignment of
+                                 AlignLeft    -> "left"
+                                 AlignRight   -> "right"
+                                 AlignCenter  -> "center"
+                                 AlignDefault -> "left"
+
+tableItemToDokuWiki :: WriterOptions
+                     -> String
+                     -> String
+                     -> [Block]
+                     -> State WriterState String
+tableItemToDokuWiki opts celltype align' item = do
+  let mkcell x = "<" ++ celltype ++ " align=\"" ++ align' ++ "\">" ++
+                    x ++ "</" ++ celltype ++ ">"
+  contents <- blockListToDokuWiki opts item
+  return $ mkcell contents
+
+-- | Convert list of Pandoc block elements to DokuWiki.
+blockListToDokuWiki :: WriterOptions -- ^ Options
+                    -> [Block]       -- ^ List of block elements
+                    -> State WriterState String
+blockListToDokuWiki opts blocks =
+  mapM (blockToDokuWiki opts) blocks >>= return . vcat
+
+-- | Convert list of Pandoc inline elements to DokuWiki.
+inlineListToDokuWiki :: WriterOptions -> [Inline] -> State WriterState String
+inlineListToDokuWiki opts lst =
+  mapM (inlineToDokuWiki opts) lst >>= return . concat
+
+-- | Convert Pandoc inline element to DokuWiki.
+inlineToDokuWiki :: WriterOptions -> Inline -> State WriterState String
+
+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 $ "<s>" ++ contents ++ "</s>"
+
+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) =
+  return $ "<code>" ++ (escapeString str) ++ "</code>"
+
+inlineToDokuWiki _ (Str str) = return $ escapeString str
+
+inlineToDokuWiki _ (Math _ str) = return $ "<math>" ++ str ++ "</math>"
+                                 -- note:  str should NOT be escaped
+
+inlineToDokuWiki _ (RawInline "mediawiki" str) = return str
+inlineToDokuWiki _ (RawInline "html" str) = return str
+inlineToDokuWiki _ (RawInline _ _) = return ""
+
+inlineToDokuWiki _ (LineBreak) = return "<br />"
+
+inlineToDokuWiki _ Space = return " "
+
+inlineToDokuWiki opts (Link txt (src, _)) = do
+  label <- inlineListToDokuWiki opts txt
+  case txt of
+     [Str 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 = if (null tit)
+               then if null alt
+                       then ""
+                       else "|" ++ alt'
+               else "|" ++ tit
+  return $ "[[Image:" ++ source ++ txt ++ "]]"
+
+inlineToDokuWiki opts (Note contents) = do
+  contents' <- blockListToDokuWiki opts contents
+  modify (\s -> s { stNotes = True })
+  return $ "<ref>" ++ contents' ++ "</ref>"
+  -- note - may not work for notes with multiple blocks