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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE CPP #-}
{- |
Module : Text.Pandoc.Writers.OPML
Copyright : Copyright (C) 2013-2021 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 Data.Text (Text)
import qualified Data.Text as T
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Class.PandocMonad (PandocMonad)
import Data.Time
import Text.Pandoc.Definition
import Text.Pandoc.Options
import Text.DocLayout
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 colwidth = if writerWrapText opts == WrapAuto
then Just $ writerColumns opts
else Nothing
meta' = B.setMeta "date" (B.str $ convertDate $ docDate meta) meta
metadata <- metaToContext opts
(fmap literal . writeMarkdown def . Pandoc nullMeta)
(\ils -> literal . T.stripEnd <$>
writeMarkdown def (Pandoc nullMeta [Plain ils]))
meta'
let blocks' = makeSections False (Just 1) blocks
main <- render colwidth . vcat <$>
mapM (blockToOPML opts) blocks'
let context = defField "body" main metadata
return $
(if writerPreferAscii opts then toEntities else id) $
case writerTemplate opts of
Nothing -> main
Just tpl -> render colwidth $ 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 -> Text
showDateTimeRFC822 = T.pack . formatTime defaultTimeLocale "%a, %d %b %Y %X %Z"
convertDate :: [Inline] -> Text
convertDate ils = maybe "" showDateTimeRFC822 $
parseTimeM True defaultTimeLocale "%F" . T.unpack =<< normalizeDate (stringify ils)
-- | Convert a Block to OPML.
blockToOPML :: PandocMonad m => WriterOptions -> Block -> m (Doc Text)
blockToOPML opts (Div (_,"section":_,_) (Header _ _ title : xs)) = do
let isSect (Div (_,"section":_,_) (Header{}:_)) = True
isSect _ = False
let (blocks, rest) = break isSect xs
htmlIls <- writeHtmlInlines title
md <- if null blocks
then return mempty
else writeMarkdown def $ Pandoc nullMeta blocks
let attrs = ("text", htmlIls) :
[("_note", T.stripEnd md) | not (null blocks)]
rest' <- vcat <$> mapM (blockToOPML opts) rest
return $ inTags True "outline" attrs rest'
blockToOPML _ _ = return empty
|
