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Many people include .ghci files in their haskell projects to include needed options to load modules into ghci. Here's an example:

:set -isrc -itest -iexamples -packagehspec2

However when trying to run a file containing main through runhaskell one has to repeat all these options, e.g.:

runhaskell -isrc -itest -iexamples -packagehspec2 test/Spec.hs

Is there a good way to let runhaskell pick up the options from the .ghci file?

shahn
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1 Answers1

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I don't know of any way to make runhaskell work. What I do is just pipe "main" to ghci:

$ echo main | ghci -v0 test/Spec.hs

If you want to pass command-line arguments, that works too:

$ echo ':main -m "behaves correct"' | ghci -v0 test/Spec.hs

Or you can wrap it up in a script:

#!/usr/bin/env runhaskell
>import System.IO
>import System.Environment
>import System.Exit
>import System.Process
>
>main :: IO ()
>main = do
>  source:args <- getArgs
>  (Just h, Nothing, Nothing, pid) <- createProcess (proc "ghci" ["-v0", source]) {std_in = CreatePipe}
>  hPutStr h ("import System.Environment\nSystem.Environment.withArgs " ++ show args ++ " main\n")
>  hClose h
>  waitForProcess pid >>= exitWith

Which can be used like so:

$ ./run.lhs test/Spec.hs -m "behaves correct"
Simon Hengel
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