The hackage-db package

[Tags: bsd3, library]

This module provides simple access to the Hackage database by means of Data.Map. Suppose you wanted to implement a utility that queries the set of available versions for a given package, the following program would do the trick:

 import qualified Distribution.Hackage.DB as DB
 import Distribution.Text ( display )
 import System.Environment ( getArgs )

 main :: IO ()
 main = do
   pkgs <- getArgs
   db <- DB.readHackage
   let getVersions name = maybe [] DB.keys (DB.lookup name db)
   mapM_ (putStrLn . unwords . map display . getVersions) pkgs

When run, it would produce the following output:

 ./a.out containers deepseq cabal-install
 0.4.0 0.5.0 0.5.1 0.5.2 0.6.0 0.6.2 0.6.4 0.8.0 0.8.2 0.10.0 0.10.2

Note that once the database has been parsed, it can be accessed quickly, but the inital cost of reading 00-index.tar is fairly high.

This package is known to work on Linux and Mac OS X, but not Windows.


Versions1.0, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8
Dependenciesbase (>=3 && <5), bytestring, Cabal, containers, directory, filepath, tar (>=0.4), utf8-string
CopyrightPeter Simons
AuthorPeter Simons <>
MaintainerPeter Simons <>
Home page
Source repositoryhead: git clone git://
Upload dateThu Jul 31 13:39:54 UTC 2014
Uploaded byPeterSimons
Downloads2153 total (332 in last 30 days)




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