1 files changed, 17 insertions, 1 deletions
diff --git a/Setup.hs b/Setup.hs
index ba89b51cf..4245df203 100644
--- a/Setup.hs
+++ b/Setup.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE CPP #-}
 
 import Distribution.Simple
+import Distribution.Simple.PreProcess
 import Distribution.Simple.Setup
          (copyDest, copyVerbosity, fromFlag, installVerbosity, BuildFlags(..))
 import Distribution.PackageDescription (PackageDescription(..), Executable(..))
@@ -8,10 +9,11 @@ import Distribution.Simple.LocalBuildInfo
          (LocalBuildInfo(..), absoluteInstallDirs)
 import Distribution.Verbosity ( Verbosity, silent )
 import Distribution.Simple.InstallDirs (mandir, CopyDest (NoCopyDest))
-import Distribution.Simple.Utils (installOrdinaryFiles)
+import Distribution.Simple.Utils (installOrdinaryFiles, info)
 import Prelude hiding (catch)
 import System.Process ( rawSystem )
 import System.FilePath ( (</>) )
+import System.Directory ( findExecutable )
 import System.Exit
 
 main :: IO ()
@@ -29,6 +31,7 @@ main = do
     , instHook = \pkgdescr ->
          (instHook simpleUserHooks) pkgdescr{ executables =
             [x | x <- executables pkgdescr, exeName x /= "make-pandoc-man-pages"] }
+    , hookedPreProcessors = [ppBlobSuffixHandler]
     }
   exitWith ExitSuccess
 
@@ -53,3 +56,16 @@ installManpages pkg lbi verbosity copy =
   installOrdinaryFiles verbosity (mandir (absoluteInstallDirs pkg lbi copy))
              (zip (repeat manDir) manpages)
 
+ppBlobSuffixHandler :: PPSuffixHandler
+ppBlobSuffixHandler = ("hsb", \_ _ ->
+  PreProcessor {
+    platformIndependent = True,
+    runPreProcessor = mkSimplePreProcessor $ \infile outfile verbosity ->
+      do info verbosity $ "Preprocessing " ++ infile ++ " to " ++ outfile
+         hsb2hsPath <- findExecutable "hsb2hs"
+         case hsb2hsPath of
+            Just p  -> rawSystem p [infile, infile, outfile]
+            Nothing -> error "hsb2hs is needed to build this program: cabal install hsb2hs"
+         return ()
+
+  })