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File hackage-db.cabal of Package ghc-hackage-db
Name: hackage-db Version: 1.22 x-revision: 1 Copyright: Peter Simons License: BSD3 License-File: LICENSE Author: Peter Simons <simons@cryp.to> Maintainer: Peter Simons <simons@cryp.to> Homepage: http://github.com/peti/hackage-db Category: Distribution Synopsis: access Hackage's package database via Data.Map Cabal-Version: >= 1.6 Build-Type: Simple Tested-With: GHC >= 6.10.4 && <= 7.8.4 Description: 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 > 0.1.0.0 0.1.0.1 0.2.0.0 0.2.0.1 0.3.0.0 0.4.0.0 > 1.0.0.0 1.1.0.0 1.1.0.1 1.1.0.2 > 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 Source-Repository head Type: git Location: git://github.com/peti/hackage-db.git Library Build-Depends: base >= 3 && < 5, tar >= 0.4, Cabal, containers, directory, filepath, bytestring, utf8-string hs-source-dirs: src Exposed-Modules: Distribution.Hackage.DB.Unparsed Distribution.Hackage.DB.Parsed Distribution.Hackage.DB.Path Distribution.Hackage.DB
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