Run this script in a Git repo to output a Graphviz graph of the repo's objects.
$ cp ~/Downloads/generate-graphviz.sh
$ chmod +x generate-graphviz.sh
# Run inside a repo with a .git.
$ ./generategenerate-graphviz.sh
Graphviz output generated in git_graph.dot
$ dot -Tpng git_graph.dot > output.png
Example graph, with two commits accessible from HEAD, and one dangling commit:
Check out the blog post for more details!