Dont screw up kernelspec when no conf file is present

900b092f · Andrew Gibiansky · dbbcb06f · 900b092f
Commit 900b092f authored Mar 11, 2015 by Andrew Gibiansky
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IPython.hs src/IHaskell/IPython.hs +4 -2

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--- a/src/IHaskell/IPython.hs
+++ b/src/IHaskell/IPython.hs
@@ -150,8 +150,10 @@ installKernelspec replace opts = void $ do
  let kernelFlags :: [String]
      kernelFlags =
        ["--debug" | kernelSpecDebug opts] ++
-        ["--conf"] ++ maybe [] singleton confFile ++
-        ["--ghclib", kernelSpecGhcLibdir opts]
+        (case confFile of
+           Nothing   -> []
+           Just file -> ["--conf", file])
+        ++ ["--ghclib", kernelSpecGhcLibdir opts]

  let kernelSpec = KernelSpec { kernelDisplayName = "Haskell"
                              , kernelLanguage = kernelName