On Fri, Mar 02, 2007 at 03:17:10PM +0100, Bas van Dijk wrote:
On Friday 02 March 2007 14:48, Thomas Hartman wrote:
... But I couldn't figure out how to use them directly from the shell, and of course that's what most readers will probably wnat. ...
From Dons wiki article http://haskell.org/haskellwiki/Blog_articles I noticed this blog with a nice tip on how to run Haskell expressions from the shell:
http://www.joachim-breitner.de/blog/archives/156-Haskell-on-the-Command-Line...
I liked this trick (which involves writing bash functions that call ghc -e), but am a little disappointed that I can't see how to import modules using ghc -e, which rather severely limits what I can do with one liners. Ideally you'd at least like to be able to do something like: in my .bashrc: if which ghc >/dev/null then function hrun { ghc -e "interact($*)"; } function hmap { hrun "map($*)"; } function hmapl { hrun "unlines.map($*).lines" ; } function hmapw { hmapl "(unwords.map($*).words)" ; } fi then I'd like to run echo hello world | hmap toUpper but there's no way that I can see to import Data.Char either on the command line, or as a flag passed by hrun to ghc. Ideally one would want the bash function to always deal with importing Data.Char, one of the regexp libraries, etc. Any suggestions? -- David Roundy Department of Physics Oregon State University