A trivial script to visualise a git history as a graphviz diagram.

gitgviz.py

import os, sys
from pygit2 import Repository, GIT_SORT_TOPOLOGICAL, GIT_SORT_REVERSE
import pygit2
from graphviz import Digraph

repository_path = pygit2.discover_repository(os.getcwd())
repo = Repository(repository_path)

def nfmt(target):
  return "N{0}".format(target.id)

g = Digraph(comment=repo.head.name, edge_attr={'dir': 'back'})

for i, commit in enumerate(repo.walk(repo.head.target, GIT_SORT_TOPOLOGICAL)):
  g.node(nfmt(commit), commit.message.split('\n')[0].strip())
  for p in commit.parents:
    g.edge(nfmt(commit), nfmt(p))

#  if i > 2000:
#    break

print g.source.encode('utf8')