starts Docker Desktop on macOS on-demand

docker

#!/bin/ksh
#
#   Starts Docker Desktop on macOS on-demand.
#
#   Put this in your PATH before `/usr/local/bin/desktop`.
#

set -e

if ! /usr/local/bin/docker system info >/dev/null 2>/dev/null
then
    open /Applications/Docker.app
    echo -n 'Starting Docker Desktop'
    while ! /usr/local/bin/docker system info >/dev/null 2>/dev/null
    do
        echo -n '.'
        sleep 1
    done
    echo 'done.'
fi

exec /usr/local/bin/docker "$@"