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{-
Copyright (C) 2013 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 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.Shared
import Text.Pandoc.Options
import Text.Pandoc.Templates (renderTemplate)
import Text.Pandoc.Writers.HTML (writeHtmlString)
import Text.Pandoc.Writers.Markdown (writeMarkdown)
import Data.List ( intercalate )
import Text.Pandoc.Pretty
import Data.Time
import System.Locale (defaultTimeLocale)
-- | Convert Pandoc document to string in OPML format.
writeOPML :: WriterOptions -> Pandoc -> String
writeOPML opts (Pandoc (Meta tit auths dat) blocks) =
let title = writeHtmlInlines tit
author = writeHtmlInlines $ intercalate [Space,Str ";",Space] auths
date = convertDate dat
elements = hierarchicalize blocks
colwidth = if writerWrapText opts
then Just $ writerColumns opts
else Nothing
main = render colwidth $ vcat (map (elementToOPML opts) elements)
context = writerVariables opts ++
[ ("body", main)
, ("title", title)
, ("date", date)
, ("author", author) ]
in if writerStandalone opts
then renderTemplate context $ writerTemplate opts
else main
writeHtmlInlines :: [Inline] -> String
writeHtmlInlines ils = trim $ writeHtmlString def
$ Pandoc (Meta [] [] []) [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 (Meta [] [] [])
(map fromBlk blocks)))
| not (null blocks)]
in inTags True "outline" attrs $
vcat (map (elementToOPML opts) rest)
|
