On Sat, Sep 24, 2011 at 10:45 AM, Antoine Latter <aslatter@gmail.com> wrote:

On Fri, Sep 23, 2011 at 10:42 PM, csmagic <csmagic@gmail.com> wrote:
>
>
> On Thu, Sep 22, 2011 at 4:20 PM, Amy de Buitléir <amy@nualeargais.ie> wrote:
>>
>> csmagic <csmagic <at> gmail.com> writes:
>>
>> >
>> > Thanks Joey, AmyNow I want to go 'backwards'.For example I have
>> > Language.Haskell.Exts.SyntaxI want to dig into it. Where/How do I
>> > start?
>>
>> Using either Hayoo or Hoogle, search for "Language.Haskell.Exts.Syntax".
>> Click on
>> the results to find out more about this module (what package it's in, what
>> methods it contains, etc.) Does that answer your question?
>
> Trying out the graphviz package...
>
> $ cabal list|grep -i graphviz
> gives
> cabal: <stdout>: invalid argument
> and nothing else
>

Your example works great for me. What OS are you using, and what
version of cabal?

You could also try:

> cabal list graphviz

But that doesn't give you all of the power of regular expressions.

$ cabal --version
cabal-install version 0.10.2
using version 1.10.1.0 of the Cabal library

[I just did a cabal update cabal. Did not do anything as far as I can see]

$ uname -rv
2.6.32-5-686 #1 SMP Tue Mar 8 21:36:00 UTC 2011

$ cat /etc/debian_version
wheezy/sid

On a related note I find a lot of libghc6-something-or-other which are all described as dummy packages.

Is Debian not the best system to play around with Haskell?
I gather gentoo is where the most haskell development happens...

> But still
> $ cabal install graphviz
> still seems to install
>
> What gives?