Allow binary 0.5. Version bump to 1.12.3.1.

changelog

@@ -1,3 +1,7 @@
+pandoc (1.12.3.1)
+
+  * Relaxed version constraint on binary, allowing the use of binary 0.5.
+
 pandoc (1.12.3)
 
   * The `--bibliography` option now sets the `biblio-files` variable.

pandoc.cabal

@@ -1,5 +1,5 @@
 Name:            pandoc
-Version:         1.12.3
+Version:         1.12.3.1
 Cabal-Version:   >= 1.10
 Build-Type:      Custom
 License:         GPL
@@ -233,7 +233,7 @@ Library
                  yaml >= 0.8.3 && < 0.9,
                  vector >= 0.10 && < 0.11,
                  hslua >= 0.3 && < 0.4,
-                 binary >= 0.6 && < 0.8
+                 binary >= 0.5 && < 0.8
   Build-Tools:   alex, happy
   if flag(http-conduit)
      Build-Depends: http-conduit >= 1.9 && < 2.1,

src/Text/Pandoc/ImageSize.hs

@@ -182,9 +182,12 @@ findJfifSize bs = do
        Nothing -> fail "Did not find length record"
 
 exifSize :: ByteString -> Maybe ImageSize
-exifSize = -- runGet ((Just <$> exifHeader) `mplus` return Nothing) .
-  runGet (Just <$> exifHeader) .
-           BL.fromChunks . (:[])
+exifSize = runGet (Just <$> exifHeader) .  BL.fromChunks . (:[])
+-- NOTE:  It would be nicer to do
+-- runGet ((Just <$> exifHeader) <|> return Nothing)
+-- which would prevent pandoc from raising an error when an exif header can't
+-- be parsed.  But we only get an Alternative instance for Get in binary 0.6,
+-- and binary 0.5 ships with ghc 7.6.
 
 exifHeader :: Get ImageSize
 exifHeader = do