new github repo from the shell

#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# Description
# -----------
#
#   Script to create a github repo and [if possible] add it as a remote
#   on the current one
#
# ------------------------------------------------------------------------------
# Author
# -------
#
#  * Farfanoide (https://github.com/farfanoide)
#
# ------------------------------------------------------------------------------

[ $# -eq 0 ] && echo "Usage: $(basename $0) <repository_name> [username]" && exit 1

repo_name=$1; shift

[ $# -gt 0 ] && username=$1 || username=$(git config github.user)


endpoint='https://api.github.com/user/repos'
repo_url="$(curl -u ${username} ${endpoint} -d "{\"name\":\"${repo_name}\"}" | grep ssh_url | cut -d\"  -f4 )"
origin="$(git remote -v | grep origin)"

if [ ! -z "${repo_url}" -a -z "${origin}" ]; then
  git remote add origin $repo_url
fi

# TODO: git init if not exists, ask for remote name if origin exists