prezto/functions/update-omz

# Update OMZ
# Jonathan Dahan <jonathan@jedahan.com>

# To auto-commit changes from upstream without review (dangerous!), add to your zshrc:
#
# zstyle ':omz:function:update-omz' auto-commit 'yes'
#
# This will still favor local changes when there are conflicts

current_path=$PWD
cd $OMZ_HOME

zstyle -t ':omz:function:update-omz' auto-commit || local nocommit='--no-commit'

if git pull $nocommit --strategy=recursive -X ours origin master; then
  zstyle -t ':omz:function:update-omz' color && printf "$FG[blue]"
  printf 'Hooray! oh-my-zsh is up-to-date :)'
else
  zstyle -t ':omz:function:update-omz' color && printf "$FG[red]"
  printf 'Oh no! There was an error updating oh-my-zsh :('
fi

cd "$current_path"