    {-# LANGUAGE NoImplicitPrelude #-}

    {-
    Copyright (C) 2017-2018 Jesse Rosenthal <jrosenthal@jhu.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.Powerpoint
       Copyright   : Copyright (C) 2017-2018 Jesse Rosenthal
       License     : GNU GPL, version 2 or above

       Maintainer  : Jesse Rosenthal <jrosenthal@jhu.edu>
       Stability   : alpha
       Portability : portable

    Conversion of 'Pandoc' documents to powerpoint (pptx). -}

    {-
    This is a wrapper around two modules:

      - Text.Pandoc.Writers.Powerpoint.Presentation (which converts a
        pandoc document into a Presentation datatype), and

      - Text.Pandoc.Writers.Powerpoint.Output (which converts a
        Presentation into a zip archive, which can be output).
    -}

    module Text.Pandoc.Writers.Powerpoint (writePowerpoint) where

    import Prelude
    import Codec.Archive.Zip
    import Text.Pandoc.Definition
    import Text.Pandoc.Walk
    import Text.Pandoc.Class (PandocMonad, report)
    import Text.Pandoc.Options (WriterOptions)
    import Text.Pandoc.Writers.Shared (fixDisplayMath)
    import Text.Pandoc.Writers.Powerpoint.Presentation (documentToPresentation)
    import Text.Pandoc.Writers.Powerpoint.Output (presentationToArchive)
    import qualified Data.ByteString.Lazy as BL

    writePowerpoint :: (PandocMonad m)
                    => WriterOptions  -- ^ Writer options
                    -> Pandoc         -- ^ Document to convert
                    -> m BL.ByteString
    writePowerpoint opts (Pandoc meta blks) = do
      let blks' = walk fixDisplayMath blks
      let (pres, logMsgs) = documentToPresentation opts (Pandoc meta blks')
      mapM_ report logMsgs
      archv <- presentationToArchive opts pres
      return $ fromArchive archv