[Haskell-cafe] ghc -e with standard input

[Rodrigo Queiro]

interact :: (String -> String) -> IO () is a very handy function for
ghc -e, e.g.

ghc -e 'interact $ lines . map (show . (*2) . read) . unlines'

will multiply the number on every line by 2. (interact takes a
function which maps from entire input to entire output)

On 05/11/2007, Graham Fawcett <graham.fawcett at gmail.com> wrote:
> On Nov 5, 2007 1:46 PM, Maurí­cio <briqueabraque at yahoo.com> wrote:
> > Hi,
> >
> > Is there a way to run 'ghc -e' taking input
> > from standard input? I would like to use it
> > in a pipe.
>
> It seems to me that you can use getContents, et. al., as you would
> from any other Haskell program:
>
> $ echo hello there mauricio | ghc -e "print =<< (Control.Monad.liftM
> (reverse . words)) getContents"
> ["mauricio","there","hello"]
>
> G
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