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|
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE CPP #-}
{- |
Module : Text.Pandoc.Writers.OPML
Copyright : Copyright (C) 2013-2019 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 Prelude
import Control.Monad.Except (throwError)
import Data.Text (Text, unpack)
import qualified Data.Text as T
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Class (PandocMonad)
import Data.Time
import Text.Pandoc.Definition
import Text.Pandoc.Error
import Text.Pandoc.Options
import Text.Pandoc.Pretty
import Text.Pandoc.Shared
import Text.Pandoc.Templates (renderTemplate')
import Text.Pandoc.Writers.HTML (writeHtml5String)
import Text.Pandoc.Writers.Markdown (writeMarkdown)
import Text.Pandoc.Writers.Shared
import Text.Pandoc.XML
-- | Convert Pandoc document to string in OPML format.
writeOPML :: PandocMonad m => WriterOptions -> Pandoc -> m Text
writeOPML opts (Pandoc meta blocks) = do
let elements = hierarchicalize blocks
colwidth = if writerWrapText opts == WrapAuto
then Just $ writerColumns opts
else Nothing
meta' = B.setMeta "date" (B.str $ convertDate $ docDate meta) meta
metadata <- metaToJSON opts
(writeMarkdown def . Pandoc nullMeta)
(\ils -> T.stripEnd <$> writeMarkdown def (Pandoc nullMeta [Plain ils]))
meta'
main <- (render colwidth . vcat) <$> mapM (elementToOPML opts) elements
let context = defField "body" main metadata
(if writerPreferAscii opts then toEntities else id) <$>
case writerTemplate opts of
Nothing -> return main
Just tpl -> renderTemplate' tpl context
writeHtmlInlines :: PandocMonad m => [Inline] -> m Text
writeHtmlInlines ils =
T.strip <$> writeHtml5String 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 $
parseTimeM True defaultTimeLocale "%F" =<< normalizeDate (stringify ils)
-- | Convert an Element to OPML.
elementToOPML :: PandocMonad m => WriterOptions -> Element -> m Doc
elementToOPML _ (Blk _) = return empty
elementToOPML opts (Sec _ _num _ title elements) = do
let isBlk :: Element -> Bool
isBlk (Blk _) = True
isBlk _ = False
fromBlk :: PandocMonad m => Element -> m Block
fromBlk (Blk x) = return x
fromBlk _ = throwError $ PandocSomeError "fromBlk called on non-block"
(blocks, rest) = span isBlk elements
htmlIls <- writeHtmlInlines title
md <- if null blocks
then return mempty
else do blks <- mapM fromBlk blocks
writeMarkdown def $ Pandoc nullMeta blks
let attrs = ("text", unpack htmlIls) :
[("_note", unpack md) | not (null blocks)]
o <- mapM (elementToOPML opts) rest
return $ inTags True "outline" attrs $ vcat o
|
