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{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-
Copyright (C) 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.MediaBag
Copyright : Copyright (C) 2014 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Definition of a MediaBag object to hold binary resources, and an
interface for interacting with it.
-}
module Text.Pandoc.MediaBag (
MediaBag,
lookupMedia,
insertMedia,
mediaDirectory,
extractMediaBag
) where
import Control.Monad (when)
import Control.Monad.Trans (MonadIO (..))
import qualified Data.ByteString.Lazy as BL
import Data.Data (Data)
import qualified Data.Map as M
import Data.Maybe (fromMaybe)
import Data.Typeable (Typeable)
import System.Directory (createDirectoryIfMissing)
import System.FilePath
import qualified System.FilePath.Posix as Posix
import System.IO (stderr)
import Text.Pandoc.MIME (MimeType, getMimeTypeDef)
import qualified Text.Pandoc.UTF8 as UTF8
-- | A container for a collection of binary resources, with names and
-- mime types. Note that a 'MediaBag' is a Monoid, so 'mempty'
-- can be used for an empty 'MediaBag', and '<>' can be used to append
-- two 'MediaBag's.
newtype MediaBag = MediaBag (M.Map [String] (MimeType, BL.ByteString))
deriving (Monoid, Data, Typeable)
instance Show MediaBag where
show bag = "MediaBag " ++ show (mediaDirectory bag)
-- | Insert a media item into a 'MediaBag', replacing any existing
-- value with the same name.
insertMedia :: FilePath -- ^ relative path and canonical name of resource
-> Maybe MimeType -- ^ mime type (Nothing = determine from extension)
-> BL.ByteString -- ^ contents of resource
-> MediaBag
-> MediaBag
insertMedia fp mbMime contents (MediaBag mediamap) =
MediaBag (M.insert (splitDirectories fp) (mime, contents) mediamap)
where mime = fromMaybe fallback mbMime
fallback = case takeExtension fp of
".gz" -> getMimeTypeDef $ dropExtension fp
_ -> getMimeTypeDef fp
-- | Lookup a media item in a 'MediaBag', returning mime type and contents.
lookupMedia :: FilePath
-> MediaBag
-> Maybe (MimeType, BL.ByteString)
lookupMedia fp (MediaBag mediamap) = M.lookup (splitDirectories fp) mediamap
-- | Get a list of the file paths stored in a 'MediaBag', with
-- their corresponding mime types and the lengths in bytes of the contents.
mediaDirectory :: MediaBag -> [(String, MimeType, Int)]
mediaDirectory (MediaBag mediamap) =
M.foldWithKey (\fp (mime,contents) ->
(((Posix.joinPath fp), mime, fromIntegral $ BL.length contents):)) [] mediamap
-- | Extract contents of MediaBag to a given directory. Print informational
-- messages if 'verbose' is true.
-- TODO: eventually we may want to put this into PandocMonad
-- In PandocPure, it could write to the fake file system...
extractMediaBag :: MonadIO m
=> Bool
-> FilePath
-> MediaBag
-> m ()
extractMediaBag verbose dir (MediaBag mediamap) = liftIO $ do
sequence_ $ M.foldWithKey
(\fp (_ ,contents) ->
((writeMedia verbose dir (Posix.joinPath fp, contents)):)) [] mediamap
writeMedia :: Bool -> FilePath -> (FilePath, BL.ByteString) -> IO ()
writeMedia verbose dir (subpath, bs) = do
-- we join and split to convert a/b/c to a\b\c on Windows;
-- in zip containers all paths use /
let fullpath = dir </> normalise subpath
createDirectoryIfMissing True $ takeDirectory fullpath
when verbose $ UTF8.hPutStrLn stderr $ "pandoc: extracting " ++ fullpath
BL.writeFile fullpath bs
|
