[GIT] Finding a branch point

Finding a branch point with Git? - Stack Overflow
http://stackoverflow.com/questions/1527234/finding-a-branch-point-with-git

git config --global alias.oldest-ancestor '!zsh -c '\''diff --old-line-format='' --new-line-format='' <(git rev-list --first-parent "${1:-master}") <(git rev-list --first-parent "${2:-HEAD}") | head -1'\'' -'