this works. now if only there were a "quiet" option for ghci...

well, for me, I guess this may be goodbye to poor sad undocumented malfunctioning runghc..

hartthoma@linuxpt:~/personal/PersonalRepos/pharchive/learning/haskell/UnixTools/arghandling>echo ":main 1 2 3" | /usr/local/bin/ghci-6.6.1 arghandling-nice.hs
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version 6.6.1, for Haskell 98.
/ /_\\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.

Loading package base ... linking ... done.
[1 of 1] Compiling Main ( arghandling-nice.hs, interpreted )
Ok, modules loaded: Main.
*Main> Loading package haskell98 ... linking ... done.
"1 2 3"
*Main> Leaving GHCi.

Thomas Hartman <thomas.hartman+external@db.com>
Sent by: haskell-cafe-bounces@haskell.org

08/22/2007 01:38 PM

To	"haskell-cafe@haskell.org" <haskell-cafe@haskell.org>
cc
Subject	[Haskell-cafe] -f flag to runghc broken, or is it just me? (because trying switch elegantly between ghc 6.6 and ghc 6.7)

I'm doing a lot of switching between ghc 6.6 and ghc 6.7 on the same computer. I install modules using

$ runghc Setup.hs configure
etc.

I would like to specify which version of ghc should be getting the package installed via the f flag to runghc

$ :~/personal/PersonalRepos/pharchive/learning/haskell/UnixTools/arghandling>runghc
runghc: syntax: runghc [-f GHCPATH] [GHC-ARGS] FILE ARG...

but this appears to be broken.

$ :~/personal/PersonalRepos/pharchive/learning/haskell/UnixTools/arghandling>runghc arghandling-nice.hs
arghandling-nice.hs: args length does not equal 3. args: : []
usage example: $ runghc arghandling-nice.hs firstarg secondarg thirdarg

without the flag works but

$ :~/personal/PersonalRepos/pharchive/learning/haskell/UnixTools/arghandling>runghc -f /usr/local/bin/ghc-6.6.1 arghandling-nice.hs

does nothing.

$ :~/personal/PersonalRepos/pharchive/learning/haskell/UnixTools/arghandling>ls -l /usr/local/bin/ghc-6.6.1
-rwxr-xr-x 1 root root 151 2007-06-16 20:22 /usr/local/bin/ghc-6.6.1

In general I don't like using runghc because it doesn't appear to be documented anywhere except that (incorrect?) usage message. Is there a way to do a package install just using ghc -e? (Sure I could compile, but it helps me sometimes if I can not, a la runghc.) At any rate I couldn't figure out how to pass arguments to main via ghc -e.

$ :~/personal/PersonalRepos/pharchive/learning/haskell/UnixTools/arghandling>cat arghandling-nice.hs
import System

main = do args <- getArgs
let usagemsg = "usage example: $ runghc arghandling-nice.hs firstarg secondarg thirdarg"
case args of
[first,second,third] -> process first second third
_ -> error $ "args length does not equal 3. args: : " ++ ( show args ) ++ "\n" ++ usagemsg

process a b c = print $ unwords [a,b,c]

Thanks for anybody who can help me out with this.

Thomas.
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