Plugins: How to determine ghc vs ghci

[Levent Erkok]

I'm working on a plugin, and would like to be able to tell if it's GHC or
GHCi that's running.

I tried:

   df   <- getDynFlags
   let isGHCi = ghcMode df == CompManager

Alas, while that correctly tells apart "ghci" from "ghc -c", it also
returns True when ghc is called without the "-c" argument.

Is there a better/more robust way of figuring out whether we're in an
interactive session?

-Levent.
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