The hit package

[ Tags: bsd3, development, library ] [ Propose Tags ]

An haskell implementation of git storage operations, allowing users to manipulate git repositories (read and write).

This implementation is fully interoperable with the main C implementation.

This is stricly only manipulating the git store (what's inside the .git directory), and doesn't do anything with the index or your working directory files.

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Versions 0.1.0, 0.2.0, 0.2.1, 0.2.2, 0.3.0, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.5.0, 0.5.1, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.6.0, 0.6.1, 0.6.2, 0.6.3
Dependencies attoparsec (>=0.10.1), base (==4.*), blaze-builder, bytestring, containers, cryptohash, directory, filepath, hashable, hashtables, hit, mtl, parsec (>=3), random, system-fileio, system-filepath, time, vector, zlib, zlib-bindings (==0.1.*) [details]
License BSD3
Copyright Vincent Hanquez <>
Author Vincent Hanquez <>
Maintainer Vincent Hanquez <>
Category Development
Home page
Source repository head: git clone git://
Uploaded Tue Oct 9 19:42:31 UTC 2012 by VincentHanquez
Distributions Arch:0.6.3, Debian:0.6.3, LTSHaskell:0.6.3, NixOS:0.6.3, Stackage:0.6.3, Tumbleweed:0.6.3
Executables Hit
Downloads 5432 total (47 in the last 30 days)
Rating 0.0 (0 ratings) [clear rating]
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Status Docs uploaded by user
Build status unknown [no reports yet]
Hackage Matrix CI





Build the executable


Add some debugging options


Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info


Maintainer's Corner

For package maintainers and hackage trustees

Readme for hit-0.4.1

[back to package description]


Hit is a reimplementation of some git operations in pure haskell.

what it does do:

  • read loose objects, and packed objects.
  • write new loose objects
  • git like operations available: commit, cat-file, verify-pack, rev-list, ls-tree.

what is doesn't do:

  • reimplement the whole of git.
  • checkout's index reading/writing, fetching, merging, diffing.

The main functions for users are available from the Data.Git module.

The essential functions are:

  • withRepo: create a new git context and execute a function with the context. functional equivalent of withFile but for git repository.
  • withCurrentRepo: similar to withRepo but found the repository from the user current directory.
  • resolveRevision: turns a git revision (e.g. HEAD, 0a24^^^~3) into a SHA1 reference.
  • resolvePath: from a commit ref and a path, it will gives the tree or blob reference of the object at the specific path (see example).
  • getObject: from a SHA1 reference, gives a high level object (Commit, Blob, Tree, Tag, Delta) from the git repository. if called with resolveDelta set, it will resolves deltas to be simple objects with the deltas applied.
  • getObjectRaw: similar to getObject but gives a raw representation (lazy bytestring) of the object.
  • getCommit: similar to getObject but gives back a commit.
  • getTree: similar to getObject but gives back a tree.

API Example

resolving path of the README file and returning the reference to the blob :

{-# LANGUAGE OverloadedStrings #-}
import Data.Git.Repository

showPathRef commitRef = withRepo ".git" $ \git -> do
    ref <- maybe (error "inexistent object at this path") id `fmap` resolvePath git commitRef ["README"]
    putStrLn ("README has the reference: " ++ show ref)

catting an object from a ref:

import Data.Git.Repository

catFile ref = withRepo ".git" $ \git -> do
    obj <- maybe (error "not a valid object") id `fmap` getObjectRaw git ref True
    L.putStrLn (oiData obj)

more examples on how to use api can be found in Hit.hs.