Which Haskell package contains given module.

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+2 Q:

Which Haskell package contains given module.

I know a Haskell module name, but I can't figure out in what package it is defined. This is bad because I can't compile without a package exposing this module.

Specificaly it is Text.Regex that I can't locate, but I would like to know how to solve that problem in general.

+3 A:

http://www.haskell.org/ghc/docs/latest/html/users_guide/packages.html

ghc-pkg find-module Text.Regex

But that only works for (a) recent GHCs, and (b) packages installed on your system.

You can also grep through the package file (e.g. /usr/lib/ghc-6.8.2/package.conf) to see what's installed.

You can also use either the haskell API search engines hoogle or the hackage search engine hayoo.

Text.Regex is in the package regex-base, and a few others built on top of it.

wnoise 2008-09-26 20:42:07

I have ghc-pkg 6.8.2, and it does not accept find-module :(

luntain 2008-09-26 20:45:55

I could find it only by clicking on a few of the results from hoogle. At the moment there seem to be no easy way to find those packages. Hopefully new release of ghc will fix this issue.

luntain 2008-09-26 21:08:41

+1 Hoogle. It is by far the easiest way I have found. Command line stuff is a bit unnecessary when there's a perfectly good search engine option :) (imho)

OJ 2008-10-01 06:02:19

That's less helpful when you're offline. Hopefully such barbarism is rare, but...

wnoise 2008-10-01 19:21:16

ansaurus

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Which Haskell package contains given module.

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