https://github.com/datasift/gitflow/blob/develop/git-hf-featureの部分コピペ

git-hf-feature.bash

cmd_push() {
  parse_remote_name "$@"
  if [ -z "$REMOTE" ]; then
    REMOTE="$ORIGIN"
  fi
  name_or_current

  # sanity checks
  require_clean_working_tree
  require_branch "$BRANCH"
  git fetch -q "$REMOTE"

  # are we publishing for the first time, or pushing?
  if ! git_branch_exists "$REMOTE/$BRANCH" ; then

    # create remote branch
    git push "$REMOTE" "$BRANCH:refs/heads/$BRANCH"
    git fetch -q "$REMOTE"

    # configure remote tracking
    git config "branch.$BRANCH.remote" "$REMOTE"
    git config "branch.$BRANCH.merge" "refs/heads/$BRANCH"

    echo
    echo "Summary of actions:"
    echo "- A new remote branch '$REMOTE/$BRANCH' was created"
    echo "- The local branch '$BRANCH' was configured to track the remote branch"
    echo
  else
    git push "$REMOTE" "$BRANCH:refs/heads/$BRANCH" || die "Push failed"

    echo
    echo "Summary of actions:"
    echo "- The remote branch '$REMOTE/$BRANCH' was updated with your changes"
  fi
}

#......

parse_remote_name() {
  # parse options
  FLAGS "$@" || exit $?
  eval set -- "${FLAGS_ARGV}"

  # read arguments into global variables
  REMOTE=$1
  NAME=$2
  BRANCH=$PREFIX$NAME
}

#......

name_or_current() {
  if [ -z "$NAME" ]; then
    use_current_feature_branch_name
  fi
}

#......

use_current_feature_branch_name() {
  local current_branch=$(git_current_branch)
  if startswith "$current_branch" "$PREFIX"; then
    BRANCH=$current_branch
    NAME=${BRANCH#$PREFIX}
  else
    warn "The current HEAD is no feature branch."
    warn "Please specify a <name> argument."
    exit 1
  fi
}