Fix patchBuildToolProgs when haddock cannot be found

Cabal's GHC.configure doesn't demand haddock exist, so we have to handle the case where it's not installed.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/CabalHelper/Compiletime/Program/Stack.hs b/src/CabalHelper/Compiletime/Program/Stack.hs
index d057d65..dc0b0e5 100644
--- a/src/CabalHelper/Compiletime/Program/Stack.hs
+++ b/src/CabalHelper/Compiletime/Program/Stack.hs
@@ -85,7 +85,7 @@ paths qe@QueryEnv{qeProjLoc=ProjLocStackYaml stack_yaml} cwd
     workdirArg qe ++ [ "path", "--stack-yaml="++stack_yaml ]
   return $ \k -> let Just x = lookup k $ map split $ lines out in x
   where
-    split l = let (key, ' ' : val) = span (not . isSpace) l in (key, val)
+    split l = let (key, val) = break isSpace l in (key, dropWhile isSpace val)
 
 listPackageCabalFiles :: QueryEnvI c 'Stack -> IO [CabalFile]
 listPackageCabalFiles qe@QueryEnv{qeProjLoc}