github.com/src-d/go-git (go): A highly extensible git implementation in pure Go.  go-git aims to reach the completeness of libgit2 or jgit, nowadays covers the majority of the plumbing read operations and some of the main write operations, but lacks the main porcelain operations such as merges.  It is highly extensible, we have been following the open/close principle in its design to facilitate extensions, mainly focusing the efforts on the persistence of the objects.
Keywords: git|git-client|git-server|go-git|golang