    {-# LANGUAGE NoImplicitPrelude #-}
    {-
    Copyright (C) 2006-2018 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
    -}
    {-# LANGUAGE FlexibleInstances   #-}
    {-# LANGUAGE GADTs               #-}
    {-# LANGUAGE ScopedTypeVariables #-}

    {- |
       Module      : Text.Pandoc
       Copyright   : Copyright (C) 2006-2018 John MacFarlane
       License     : GNU GPL, version 2 or above

       Maintainer  : John MacFarlane <jgm@berkeley.edu>
       Stability   : alpha
       Portability : portable

    This helper module exports all writers functions.
    -}
    module Text.Pandoc.Writers
      (
        -- * Writers: converting /from/ Pandoc format
          Writer(..)
        , writers
        , writeAsciiDoc
        , writeBeamer
        , writeCommonMark
        , writeConTeXt
        , writeCustom
        , writeDZSlides
        , writeDocbook4
        , writeDocbook5
        , writeDocx
        , writeDokuWiki
        , writeEPUB2
        , writeEPUB3
        , writeFB2
        , writeHaddock
        , writeHtml4
        , writeHtml4String
        , writeHtml5
        , writeHtml5String
        , writeICML
        , writeJATS
        , writeJSON
        , writeLaTeX
        , writeMan
        , writeMarkdown
        , writeMediaWiki
        , writeMs
        , writeMuse
        , writeNative
        , writeODT
        , writeOPML
        , writeOpenDocument
        , writeOrg
        , writePlain
        , writePowerpoint
        , writeRST
        , writeRTF
        , writeRevealJs
        , writeS5
        , writeSlideous
        , writeSlidy
        , writeTEI
        , writeTexinfo
        , writeTextile
        , writeZimWiki
        , getWriter
        ) where

    import Prelude
    import Data.Aeson
    import qualified Data.ByteString.Lazy as BL
    import Data.List (intercalate)
    import Data.Text (Text)
    import Text.Pandoc.Class
    import Text.Pandoc.Definition
    import Text.Pandoc.Options
    import qualified Text.Pandoc.UTF8 as UTF8
    import Text.Pandoc.Writers.AsciiDoc
    import Text.Pandoc.Writers.CommonMark
    import Text.Pandoc.Writers.ConTeXt
    import Text.Pandoc.Writers.Custom
    import Text.Pandoc.Writers.Docbook
    import Text.Pandoc.Writers.Docx
    import Text.Pandoc.Writers.DokuWiki
    import Text.Pandoc.Writers.EPUB
    import Text.Pandoc.Writers.FB2
    import Text.Pandoc.Writers.Haddock
    import Text.Pandoc.Writers.HTML
    import Text.Pandoc.Writers.ICML
    import Text.Pandoc.Writers.JATS
    import Text.Pandoc.Writers.LaTeX
    import Text.Pandoc.Writers.Man
    import Text.Pandoc.Writers.Markdown
    import Text.Pandoc.Writers.MediaWiki
    import Text.Pandoc.Writers.Ms
    import Text.Pandoc.Writers.Muse
    import Text.Pandoc.Writers.Native
    import Text.Pandoc.Writers.ODT
    import Text.Pandoc.Writers.OpenDocument
    import Text.Pandoc.Writers.OPML
    import Text.Pandoc.Writers.Org
    import Text.Pandoc.Writers.Powerpoint
    import Text.Pandoc.Writers.RST
    import Text.Pandoc.Writers.RTF
    import Text.Pandoc.Writers.TEI
    import Text.Pandoc.Writers.Texinfo
    import Text.Pandoc.Writers.Textile
    import Text.Pandoc.Writers.ZimWiki
    import Text.Parsec.Error

    data Writer m = TextWriter (WriterOptions -> Pandoc -> m Text)
                  | ByteStringWriter (WriterOptions -> Pandoc -> m BL.ByteString)

    -- | Association list of formats and writers.
    writers :: PandocMonad m => [ ( String, Writer m) ]
    writers = [
       ("native"       , TextWriter writeNative)
      ,("json"         , TextWriter $ \o d -> return $ writeJSON o d)
      ,("docx"         , ByteStringWriter writeDocx)
      ,("odt"          , ByteStringWriter writeODT)
      ,("pptx"         , ByteStringWriter writePowerpoint)
      ,("epub"         , ByteStringWriter writeEPUB3)
      ,("epub2"        , ByteStringWriter writeEPUB2)
      ,("epub3"        , ByteStringWriter writeEPUB3)
      ,("fb2"          , TextWriter writeFB2)
      ,("html"         , TextWriter writeHtml5String)
      ,("html4"        , TextWriter writeHtml4String)
      ,("html5"        , TextWriter writeHtml5String)
      ,("icml"         , TextWriter writeICML)
      ,("s5"           , TextWriter writeS5)
      ,("slidy"        , TextWriter writeSlidy)
      ,("slideous"     , TextWriter writeSlideous)
      ,("dzslides"     , TextWriter writeDZSlides)
      ,("revealjs"     , TextWriter writeRevealJs)
      ,("docbook"      , TextWriter writeDocbook5)
      ,("docbook4"     , TextWriter writeDocbook4)
      ,("docbook5"     , TextWriter writeDocbook5)
      ,("jats"         , TextWriter writeJATS)
      ,("opml"         , TextWriter writeOPML)
      ,("opendocument" , TextWriter writeOpenDocument)
      ,("latex"        , TextWriter writeLaTeX)
      ,("beamer"       , TextWriter writeBeamer)
      ,("context"      , TextWriter writeConTeXt)
      ,("texinfo"      , TextWriter writeTexinfo)
      ,("man"          , TextWriter writeMan)
      ,("ms"           , TextWriter writeMs)
      ,("markdown"     , TextWriter writeMarkdown)
      ,("markdown_strict" , TextWriter writeMarkdown)
      ,("markdown_phpextra" , TextWriter writeMarkdown)
      ,("markdown_github" , TextWriter writeMarkdown)
      ,("markdown_mmd" , TextWriter writeMarkdown)
      ,("plain"        , TextWriter writePlain)
      ,("rst"          , TextWriter writeRST)
      ,("mediawiki"    , TextWriter writeMediaWiki)
      ,("dokuwiki"     , TextWriter writeDokuWiki)
      ,("zimwiki"      , TextWriter writeZimWiki)
      ,("textile"      , TextWriter writeTextile)
      ,("rtf"          , TextWriter writeRTF)
      ,("org"          , TextWriter writeOrg)
      ,("asciidoc"     , TextWriter writeAsciiDoc)
      ,("haddock"      , TextWriter writeHaddock)
      ,("commonmark"   , TextWriter writeCommonMark)
      ,("gfm"          , TextWriter writeCommonMark)
      ,("tei"          , TextWriter writeTEI)
      ,("muse"         , TextWriter writeMuse)
      ]

    -- | Retrieve writer, extensions based on formatSpec (format+extensions).
    getWriter :: PandocMonad m => String -> Either String (Writer m, Extensions)
    getWriter s
      = case parseFormatSpec s of
             Left e  -> Left $ intercalate "\n" [m | Message m <- errorMessages e]
             Right (writerName, setExts) ->
                 case lookup writerName writers of
                         Nothing -> Left $ "Unknown writer: " ++ writerName
                         Just r -> Right (r, setExts $
                                      getDefaultExtensions writerName)

    writeJSON :: WriterOptions -> Pandoc -> Text
    writeJSON _ = UTF8.toText . BL.toStrict . encode