Preparing the DOCKER environment variables for fig to use, as pulled from a docker-machine config

docker-machine.sh

if which docker-machine > /dev/null 2>&1; then
  export DOCKER_HOST=""

  alias d="docker $(docker-machine config $(docker-machine ls -q | head -1))"

  declare -a lines=( $(docker-machine config $(docker-machine ls -q | head -1)) )
  for (( i = 0; i < ${#lines[*]}; ++ i )) ; do
    line="${lines[$i]}"
    if [ "$line" = "--tls" ]; then
      export DOCKER_TLS_VERIFY=true
    fi
    if echo "$line" | grep tlscert > /dev/null; then
      docker_cert_file=$(echo "$line" | cut -d= -f2)
      export DOCKER_CERT_PATH=$(dirname $docker_cert_file)
    fi
    if [ "$line" = "-H" ]; then
      DOCKER_HOST="${lines[$i+1]}"
    fi
  done
fi

I put this in my dotfiles as ~/.bash_profile.d/docker-machine.sh so that it is sourced automagically.