How to use

Make backups

mv ~/.vimrc ~/.vimrc.BAK
mv ~/.gitconfig ~/.gitconfig.BAK
mv ~/.bashrc ~/.bashrc.BAK

Make synbolic link

ln -s ~/dotfiles/_vimrc ~/.vimrc
ln -s ~/dotfiles/_gitconfig ~/.gitconfig
ln -s ~/dotfiles/_bashrc ~/.bashrc

Copy to your setting PATH

cp ~/dotfiles/git_diff_wrapper /usr/local/bin/