ensure-git-completion.bash

#You should copy-paste or source this to/from your ~/.bash_profile (or whatever you're using)
git_complete_dir="$HOME/.git-completion"
if [ ! -d "$git_complete_dir" ]; then
  mkdir "$git_complete_dir"
fi
command pushd "$git_complete_dir" > /dev/null
  now="$(date +%Y-%m-%d)"
  if [ "$(tail -1 check.log)" != "$now" ]; then
    echo "$now" >> check.log
    echo "Checking for updates..."
    curl https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash -o new-git-completion.bash
    echo "downloaded latest version... diffing with current.."
    if ! diff -r new-git-completion.bash git-completion.bash >/dev/null; then
      echo "versions differ"
      read -p "git-completion has been updated, do you want to apply this update? (y/yes): " CONDITION;
      CONDITION=$(tr '[:upper:]' '[:lower:]' <<< "$CONDITION")
      echo "Normalised comndition: $CONDITION"
      case "$CONDITION" in
       yes|y)
        echo "Updating git-completion..."
        mv git-completion.bash git-completion.bash.backup
        mv new-git-completion.bash git-completion.bash
        echo "done."
        ;;
      *)
        echo "Ok, doing nothing then."
        ;;
      esac
    fi
  fi

  . git-completion.bash
command popd > /dev/null