When I make small changes to long lines, the standard git diff display can be a little hard to read.
A community script that improves this view was merged into the git trunk and released with git 1.7.10.
This tip has some brew specific path prefixing - but as long as you specify the path to diff-highlight it will work on any OS.
Add this to your Git config:
# ~/.gitconfig [core] pager = `brew --prefix git`/share/git-core/contrib/diff-highlight/diff-highlight | less