usage() {
  echo "usage: git now grep [--patch|-p] [--stat|-s] [<base-branch>]"
}

cmd_default() {
  parse_args "$@"

  if [ -n "$BASE_BRANCH" ]; then
    WORKING_BRANCH=$(git_current_branch)
    COMMON_ANCESTOR_COMMIT=`git merge-base ${BASE_BRANCH} ${WORKING_BRANCH}`
    git log${ARGS} ${COMMON_ANCESTOR_COMMIT}.. --pretty=format:"%h - %an, %ar : %s" --grep="${PREFIX}"
  else
    git log${ARGS} --pretty=format:"%h - %an, %ar : %s" --grep="${PREFIX}"
  fi
}

parse_args() {
  # parse options
  DEFINE_boolean 'patch' false 'generate diff in patch format' 'p'
  DEFINE_boolean 'stat' false 'generate diffstat instead of patch' 's'
  FLAGS "$@" || exit $?
  eval set -- "${FLAGS_ARGV}"
  # read arguments into global variables
  BASE_BRANCH=$1
  ARGS=
  if flag patch; then
    ARGS="${ARGS} -p"
  fi
  if flag stat; then
    ARGS="${ARGS} --stat"
  fi
}

cmd_help() {
  usage
  exit 0
}