Make --package-version optional for --hoogle generation (#899)

* Make --package-version optional for --hoogle generation

* Import mkVersion

* It's makeVersion not mkVersion

1 files changed, 8 insertions, 3 deletions

diff --git a/haddock-api/src/Haddock.hs b/haddock-api/src/Haddock.hs
index 00eb50f6..1651866a 100644
--- a/haddock-api/src/Haddock.hs
+++ b/haddock-api/src/Haddock.hs
@@ -48,6 +48,7 @@ import Control.Exception
 import Data.Maybe
 import Data.IORef
 import Data.Map (Map)
+import Data.Version (makeVersion)
 import qualified Data.Map as Map
 import System.IO
 import System.Exit
@@ -362,9 +363,13 @@ render dflags flags sinceQual qual ifaces installedIfaces extSrcMap = do
   -- might want to fix that if/when these two get some work on them
   when (Flag_Hoogle `elem` flags) $ do
     case pkgNameVer of
-      (Just (PackageName pkgNameFS), Just pkgVer) ->
-          let pkgNameStr | unpackFS pkgNameFS == "main" && title /= [] = title
-                         | otherwise = unpackFS pkgNameFS
+      (Just (PackageName pkgNameFS), mpkgVer) ->
+          let
+            pkgNameStr | unpackFS pkgNameFS == "main" && title /= [] = title
+                       | otherwise = unpackFS pkgNameFS
+
+            pkgVer =
+              fromMaybe (makeVersion []) mpkgVer
           in ppHoogle dflags' pkgNameStr pkgVer title (fmap _doc prologue)
                visibleIfaces odir
       _ -> putStrLn . unlines $