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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.

Solution

  • 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.