{- Copyright (C) 2013-2014 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.OPML Copyright : Copyright (C) 2013-2014 John MacFarlane License : GNU GPL, version 2 or above Maintainer : John MacFarlane <jgm@berkeley.edu> Stability : alpha Portability : portable Conversion of 'Pandoc' documents to OPML XML. -} module Text.Pandoc.Writers.OPML ( writeOPML) where import Text.Pandoc.Definition import Text.Pandoc.XML import Text.Pandoc.Writers.Shared import Text.Pandoc.Shared import Text.Pandoc.Options import Text.Pandoc.Templates (renderTemplate') import Text.Pandoc.Writers.HTML (writeHtmlString) import Text.Pandoc.Writers.Markdown (writeMarkdown) import Text.Pandoc.Pretty import Data.Time import System.Locale (defaultTimeLocale) import qualified Text.Pandoc.Builder as B -- | Convert Pandoc document to string in OPML format. writeOPML :: WriterOptions -> Pandoc -> String writeOPML opts (Pandoc meta blocks) = let elements = hierarchicalize blocks colwidth = if writerWrapText opts then Just $ writerColumns opts else Nothing meta' = B.setMeta "date" (B.str $ convertDate $ docDate meta) meta Just metadata = metaToJSON opts (Just . writeMarkdown def . Pandoc nullMeta) (Just . trimr . writeMarkdown def . Pandoc nullMeta . (\ils -> [Plain ils])) meta' main = render colwidth $ vcat (map (elementToOPML opts) elements) context = defField "body" main metadata in if writerStandalone opts then renderTemplate' (writerTemplate opts) context else main writeHtmlInlines :: [Inline] -> String writeHtmlInlines ils = trim $ writeHtmlString def $ Pandoc nullMeta [Plain ils] -- date format: RFC 822: Thu, 14 Jul 2005 23:41:05 GMT showDateTimeRFC822 :: UTCTime -> String showDateTimeRFC822 = formatTime defaultTimeLocale "%a, %d %b %Y %X %Z" convertDate :: [Inline] -> String convertDate ils = maybe "" showDateTimeRFC822 $ parseTime defaultTimeLocale "%F" =<< (normalizeDate $ stringify ils) -- | Convert an Element to OPML. elementToOPML :: WriterOptions -> Element -> Doc elementToOPML _ (Blk _) = empty elementToOPML opts (Sec _ _num _ title elements) = let isBlk (Blk _) = True isBlk _ = False fromBlk (Blk x) = x fromBlk _ = error "fromBlk called on non-block" (blocks, rest) = span isBlk elements attrs = [("text", writeHtmlInlines title)] ++ [("_note", writeMarkdown def (Pandoc nullMeta (map fromBlk blocks))) | not (null blocks)] in inTags True "outline" attrs $ vcat (map (elementToOPML opts) rest)