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{-
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)
|
