103 lines
3.8 KiB
Haskell
103 lines
3.8 KiB
Haskell
{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE CPP #-}
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{-
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Copyright (C) 2013-2018 John MacFarlane <jgm@berkeley.edu>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-}
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{- |
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Module : Text.Pandoc.Writers.OPML
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Copyright : Copyright (C) 2013-2018 John MacFarlane
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License : GNU GPL, version 2 or above
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Maintainer : John MacFarlane <jgm@berkeley.edu>
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Stability : alpha
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Portability : portable
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Conversion of 'Pandoc' documents to OPML XML.
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-}
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module Text.Pandoc.Writers.OPML ( writeOPML) where
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import Prelude
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import Control.Monad.Except (throwError)
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import Data.Text (Text, unpack)
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import qualified Data.Text as T
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import qualified Text.Pandoc.Builder as B
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import Text.Pandoc.Class (PandocMonad)
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import Data.Time
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import Text.Pandoc.Definition
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import Text.Pandoc.Error
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import Text.Pandoc.Options
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import Text.Pandoc.Pretty
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import Text.Pandoc.Shared
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import Text.Pandoc.Templates (renderTemplate')
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import Text.Pandoc.Writers.HTML (writeHtml5String)
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import Text.Pandoc.Writers.Markdown (writeMarkdown)
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import Text.Pandoc.Writers.Shared
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import Text.Pandoc.XML
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-- | Convert Pandoc document to string in OPML format.
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writeOPML :: PandocMonad m => WriterOptions -> Pandoc -> m Text
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writeOPML opts (Pandoc meta blocks) = do
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let elements = hierarchicalize blocks
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colwidth = if writerWrapText opts == WrapAuto
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then Just $ writerColumns opts
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else Nothing
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meta' = B.setMeta "date" (B.str $ convertDate $ docDate meta) meta
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metadata <- metaToJSON opts
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(writeMarkdown def . Pandoc nullMeta)
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(\ils -> T.stripEnd <$> writeMarkdown def (Pandoc nullMeta [Plain ils]))
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meta'
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main <- (render colwidth . vcat) <$> mapM (elementToOPML opts) elements
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let context = defField "body" main metadata
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case writerTemplate opts of
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Nothing -> return main
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Just tpl -> renderTemplate' tpl context
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writeHtmlInlines :: PandocMonad m => [Inline] -> m Text
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writeHtmlInlines ils =
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T.strip <$> writeHtml5String def (Pandoc nullMeta [Plain ils])
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-- date format: RFC 822: Thu, 14 Jul 2005 23:41:05 GMT
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showDateTimeRFC822 :: UTCTime -> String
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showDateTimeRFC822 = formatTime defaultTimeLocale "%a, %d %b %Y %X %Z"
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convertDate :: [Inline] -> String
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convertDate ils = maybe "" showDateTimeRFC822 $
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parseTimeM True defaultTimeLocale "%F" =<< normalizeDate (stringify ils)
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-- | Convert an Element to OPML.
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elementToOPML :: PandocMonad m => WriterOptions -> Element -> m Doc
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elementToOPML _ (Blk _) = return empty
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elementToOPML opts (Sec _ _num _ title elements) = do
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let isBlk :: Element -> Bool
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isBlk (Blk _) = True
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isBlk _ = False
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fromBlk :: PandocMonad m => Element -> m Block
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fromBlk (Blk x) = return x
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fromBlk _ = throwError $ PandocSomeError "fromBlk called on non-block"
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(blocks, rest) = span isBlk elements
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htmlIls <- writeHtmlInlines title
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md <- if null blocks
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then return mempty
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else do blks <- mapM fromBlk blocks
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writeMarkdown def $ Pandoc nullMeta blks
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let attrs = ("text", unpack htmlIls) :
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[("_note", unpack md) | not (null blocks)]
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o <- mapM (elementToOPML opts) rest
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return $ inTags True "outline" attrs $ vcat o
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