[MacOS] Start docker if daemon is not running

dockerReady.sh

# This snippet works well as part of a .bash_profile file.
# It's based on this StackOverflow post: https://stackoverflow.com/a/48843074/11488212

# This docker daemon is a resource hog, and doesn't always need to be running imho.
# I predent the below declared alias "dr" to all my docker aliases to start up the docker daemon if it's not already running.
# This way, I don't get the annoying 'ERROR: Couldn't connect to Docker daemon. You might need to start Docker' message anymore.

# Example usage: "alias dcu="dr ; docker-compose up"

alias dr="dockerReady"
alias isDockerRunning="(docker stats --no-stream) > /dev/null 2>&1"

dockerReady() {
  if (isDockerRunning); then
    return
  elif (! isDockerRunning); then 
    open /Applications/Docker.app
    echo -n "Waiting for docker to be ready"
  while (! isDockerRunning); do
    echo -n "."
    sleep 1
  done
  echo "done."
  fi
}