1. Stefan Saasen
  2. git-in-haskell-from-the-bottom-up


git-in-haskell-from-the-bottom-up /

Filename Size Date modified Message
59 B
Don't load quickcheck in ghci
13 B
Basic clone implementation
1.5 KB
Add license file (BSD 3)
1.8 KB
Add overview and usage examples
808 B
Add 'copy' task to the Rakefile
47 B
Basic clone implementation
2.8 KB
Don't generate program coverage when running the tests

Implementing git clone in Haskell

Source code for the git clone in Haskell from the bottom up article.

The hgit executable created by this cabal package supports a very limited number of operations, most notably the clone command:

hgit clone git://github.com/juretta/git-pastiche.git

Apart from clone the following commands are supported:

  • ls-remote: Because it's already implemented as part of the clone operation
  • unpack: Unpack a raw pack file (whithout the need to have an index file for the pack) into a git repository
  • read-index: Similar to git ls-files --debug this shows the information in the git index file (expects a path to the index file though and is not required to be executed within the git repository).

    [4766] λ > hgit read-index .git/index .ghci .ghci ctime: 1363781495 mtime: 1363781495 dev: 16777220 inode: 9756391 uid: 501 gid: 20 size: 59 git file mode: Regular sha1: c364d6f7508e2f6d1607a9d73e6330d68ec7d62a


To build the binary run

cabal configure
cabal build

If any of the dependencies are missing run:

cabal install --only-dependencies

To copy it into the cabal bin directory that should be in the $PATH, run

cabal copy

There is a simple Rakefile that can be used to build the binary and to run the test suite:

[4832] λ > rake -T
rake build     # Build the hgit binary
rake clean     # Clean artifacts
rake deps      # Install required dependencies
rake dev:tags  # Generate a ctags file
rake test      # Run the tests


To run the tests directly run:

cabal clean
cabal configure --enable-tests
cabal build
cabal test --show-details=always