Refactoring:

* Shared now exports fetchItem (instead of getItem) and openURL
* fetchItem has different parameters than getItem and includes
  some logic formerly in the ODT and Docx writers
* getItem still used in SelfContained

src/Text/Pandoc/SelfContained.hs

@@ -36,12 +36,14 @@ import Network.URI (isAbsoluteURI, escapeURIString)
 import Data.ByteString.Base64
 import qualified Data.ByteString.Char8 as B
 import Data.ByteString (ByteString)
-import System.FilePath (takeExtension, takeDirectory, (</>))
+import System.FilePath (takeExtension, dropExtension, takeDirectory, (</>))
 import Data.Char (toLower, isAscii, isAlphaNum)
 import Codec.Compression.GZip as Gzip
 import qualified Data.ByteString.Lazy as L
-import Text.Pandoc.Shared (renderTags', getItem)
+import Text.Pandoc.Shared (renderTags', openURL, readDataFile)
 import Text.Pandoc.UTF8 (toString,  fromString)
+import Text.Pandoc.MIME (getMimeType)
+import System.Directory (doesFileExist)
 
 isOk :: Char -> Bool
 isOk c = isAscii c && isAlphaNum c
@@ -97,6 +99,18 @@ cssURLs userdata d orig =
                                ";base64," `B.append` (encode raw)
                   return $ x `B.append` "url(" `B.append` enc `B.append` rest
 
+getItem :: Maybe FilePath -> String -> IO (ByteString, Maybe String)
+getItem userdata f =
+  if isAbsoluteURI f
+     then openURL f
+     else do
+       let mime = case takeExtension f of
+                       ".gz" -> getMimeType $ dropExtension f
+                       x     -> getMimeType x
+       exists <- doesFileExist f
+       cont <- if exists then B.readFile f else readDataFile userdata f
+       return (cont, mime)
+
 getRaw :: Maybe FilePath -> String -> String -> IO (ByteString, String)
 getRaw userdata mimetype src = do
   let ext = map toLower $ takeExtension src

src/Text/Pandoc/Shared.hs

@@ -67,7 +67,8 @@ module Text.Pandoc.Shared (
                      inDirectory,
                      readDataFile,
                      readDataFileUTF8,
-                     getItem,
+                     fetchItem,
+                     openURL,
                      -- * Error handling
                      err,
                      warn,
@@ -545,20 +546,24 @@ readDataFileUTF8 :: Maybe FilePath -> FilePath -> IO String
 readDataFileUTF8 userDir fname =
   UTF8.toString `fmap` readDataFile userDir fname
 
-getItem :: Maybe FilePath -> String -> IO (B.ByteString, Maybe String)
-getItem userdata f =
-  if isAbsoluteURI f
-     then openURL f
-     else do
-       let mime = case takeExtension f of
-                      ".gz" -> getMimeType $ dropExtension f
+-- | Fetch an image or other item from the local filesystem or the net.
+-- Returns raw content and maybe mime type.
+fetchItem :: String -> String -> IO (B.ByteString, Maybe String)
+fetchItem sourceDir s =
+  case s of
+    _ | isAbsoluteURI s         -> openURL s
+      | isAbsoluteURI sourceDir -> openURL $ sourceDir ++ "/" ++ s
+      | otherwise               -> do
+          let mime = case takeExtension s of
+                        ".gz" -> getMimeType $ dropExtension s
                         x     -> getMimeType x
-       exists <- doesFileExist f
-       cont <- if exists then B.readFile f else readDataFile userdata f
+          let f = sourceDir </> s
+          cont <- B.readFile f
           return (cont, mime)
 
 -- TODO - have this return mime type too - then it can work for google
 -- chart API, e.g.
+-- | Read from a URL and return raw data and maybe mime type.
 openURL :: String -> IO (B.ByteString, Maybe String)
 openURL u = getBodyAndMimeType =<< simpleHTTP (getReq u)
   where getReq v = case parseURI v of

src/Text/Pandoc/Writers/Docx.hs

@@ -52,8 +52,6 @@ import Data.Unique (hashUnique, newUnique)
 import System.Random (randomRIO)
 import Text.Printf (printf)
 import qualified Control.Exception as E
-import Network.URI (isAbsoluteURI)
-import System.FilePath ((</>))
 
 data WriterState = WriterState{
          stTextProperties :: [Element]
@@ -627,14 +625,10 @@ inlineToOpenXML opts (Image alt (src, tit)) = do
     Just (_,_,elt,_) -> return [elt]
     Nothing -> do
       let sourceDir = writerSourceDirectory opts
-      let src' = case src of
-                   s | isAbsoluteURI s         -> s
-                     | isAbsoluteURI sourceDir -> sourceDir ++ "/" ++ s
-                     | otherwise               -> sourceDir </> s
-      res <- liftIO $ E.try $ getItem Nothing src'
+      res <- liftIO $ E.try $ fetchItem sourceDir src
       case res of
         Left (_ :: E.SomeException) -> do
-          liftIO $ warn $ "Could not find image `" ++ src' ++ "', skipping..."
+          liftIO $ warn $ "Could not find image `" ++ src ++ "', skipping..."
           -- emit alt text
           inlinesToOpenXML opts alt
         Right (img, _) -> do

src/Text/Pandoc/Writers/EPUB.hs

@@ -107,6 +107,7 @@ writeEPUB opts doc@(Pandoc meta _) = do
   Pandoc _ blocks <- bottomUpM
        (transformInlines (writerHTMLMathMethod opts') sourceDir picsRef) doc
   pics <- readIORef picsRef
+  -- TODO make this work with URLs:
   let readPicEntry (oldsrc, newsrc) = readEntry [] oldsrc >>= \e ->
                                           return e{ eRelativePath = newsrc }
   picEntries <- mapM readPicEntry pics

src/Text/Pandoc/Writers/ODT.hs

@@ -31,12 +31,11 @@ Conversion of 'Pandoc' documents to ODT.
 module Text.Pandoc.Writers.ODT ( writeODT ) where
 import Data.IORef
 import Data.List ( isPrefixOf )
-import System.FilePath ( takeExtension, (</>) )
 import qualified Data.ByteString.Lazy as B
 import Text.Pandoc.UTF8 ( fromStringLazy )
 import Codec.Archive.Zip
 import Text.Pandoc.Options ( WriterOptions(..) )
-import Text.Pandoc.Shared ( stringify, readDataFile, getItem, warn )
+import Text.Pandoc.Shared ( stringify, readDataFile, fetchItem, warn )
 import Text.Pandoc.ImageSize ( imageSize, sizeInPoints )
 import Text.Pandoc.MIME ( getMimeType )
 import Text.Pandoc.Definition
@@ -44,11 +43,11 @@ import Text.Pandoc.Generic
 import Text.Pandoc.Writers.OpenDocument ( writeOpenDocument )
 import Control.Monad (liftM)
 import Control.Monad.Trans (liftIO)
-import Network.URI ( unEscapeString, isAbsoluteURI )
 import Text.Pandoc.XML
 import Text.Pandoc.Pretty
 import qualified Control.Exception as E
 import Data.Time.Clock.POSIX ( getPOSIXTime )
+import System.FilePath ( takeExtension )
 
 -- | Produce an ODT file from a Pandoc document.
 writeODT :: WriterOptions  -- ^ Writer options
@@ -114,25 +113,20 @@ writeODT opts doc@(Pandoc (Meta title _ _) _) = do
 
 transformPic :: FilePath -> IORef [Entry] -> Inline -> IO Inline
 transformPic sourceDir entriesRef (Image lab (src,_)) = do
-  let src' = case unEscapeString src of
-                  s | isAbsoluteURI s         -> s
-                    | isAbsoluteURI sourceDir -> sourceDir ++ "/" ++ s
-                    | otherwise               -> sourceDir </> s
-  res <- liftIO $ E.try $ getItem Nothing src'
+  res <- liftIO $ E.try $ fetchItem sourceDir src
   case res of
      Left (_ :: E.SomeException) -> do
-       liftIO $ warn $ "Could not find image `" ++ src' ++ "', skipping..."
+       liftIO $ warn $ "Could not find image `" ++ src ++ "', skipping..."
        return $ Emph lab
      Right (img, _) -> do
        let size = imageSize img
        let (w,h) = maybe (0,0) id $ sizeInPoints `fmap` size
        let tit' = show w ++ "x" ++ show h
        entries <- readIORef entriesRef
-       let newsrc = "Pictures/" ++ show (length entries) ++ takeExtension src'
+       let newsrc = "Pictures/" ++ show (length entries) ++ takeExtension src
        let toLazy = B.fromChunks . (:[])
        epochtime <- floor `fmap` getPOSIXTime
        let entry = toEntry newsrc epochtime $ toLazy img
-       -- insert into entriesRef: sourceDir </> src', eRelativePath = newsrc
        modifyIORef entriesRef (entry:)
        return $ Image lab (newsrc, tit')
 transformPic _ _ x = return x