From f8aa5bc4de45260101b1e08c34d740a04609170c Mon Sep 17 00:00:00 2001
From: Michael Snoyman <michael@snoyman.com>
Date: Tue, 5 Jun 2018 13:40:23 -0600
Subject: [PATCH] Error out on no packages

---
 src/Stackage/Database/Cron.hs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Stackage/Database/Cron.hs b/src/Stackage/Database/Cron.hs
index 03d32a7..1bcd11b 100644
--- a/src/Stackage/Database/Cron.hs
+++ b/src/Stackage/Database/Cron.hs
@@ -164,6 +164,8 @@ createHoogleDB db man name = handleAny (\e -> print e $> Nothing) $ do
             $ sourceTarFile False tarFP
            $$ foldMapMC (liftIO . singleDB db name tmpdir)
 
+        when (null allPackagePairs) $ error $ "No Hoogle .txt files found for " ++ unpack (toPathPiece name)
+
         stackDir <- getAppUserDataDirectory "stack"
         let indexTar = stackDir </> "indices" </> "Hackage" </> "00-index.tar"
         withBinaryFile indexTar ReadMode $ \h -> do