Allow the parser to spit out meta-info

Currently we only use it only for ‘since’ annotations but with these
patches it should be fairly simple to add new attributes if we wish to.

Closes #26. It seems to work fine but due to 7.10 rush I don't have the
chance to do more exhaustive testing right now. The way the meta is
output (emphasis at the end of the whole comment) is fairly arbitrary
and subject to bikeshedding.

Note that this makes test for Bug310 fail due to interface version bump:
it can't find the docs for base with this interface version so it fails.
There is not much we can do to help this because it tests for ’built-in’
identifier, not something we can provide ourselves.

1 files changed, 14 insertions, 1 deletions

diff --git a/haddock-api/src/Haddock/InterfaceFile.hs b/haddock-api/src/Haddock/InterfaceFile.hs
index bb997b9a..e4671f5e 100644
--- a/haddock-api/src/Haddock/InterfaceFile.hs
+++ b/haddock-api/src/Haddock/InterfaceFile.hs
@@ -77,7 +77,7 @@ binaryInterfaceMagic = 0xD0Cface
 --
 binaryInterfaceVersion :: Word16
 #if __GLASGOW_HASKELL__ == 708
-binaryInterfaceVersion = 25
+binaryInterfaceVersion = 26
 
 binaryInterfaceVersionCompatibility :: [Word16]
 binaryInterfaceVersionCompatibility = [binaryInterfaceVersion]
@@ -455,6 +455,19 @@ instance Binary a => Binary (Header a) where
         t <- get bh
         return (Header l t)
 
+instance Binary Meta where
+  put_ bh Meta { _version = v } = put_ bh v
+  get bh = (\v -> Meta { _version = v }) <$> get bh
+
+instance (Binary mod, Binary id) => Binary (MetaDoc mod id) where
+  put_ bh MetaDoc { _meta = m, _doc = d } = do
+    put_ bh m
+    put_ bh d
+  get bh = do
+    m <- get bh
+    d <- get bh
+    return $ MetaDoc { _meta = m, _doc = d }
+
 {-* Generated by DrIFT : Look, but Don't Touch. *-}
 instance (Binary mod, Binary id) => Binary (DocH mod id) where
     put_ bh DocEmpty = do