docker-github-bash-prompt.sh

# add this to your ~/.bash_profile to get a bash prompt like
# ~/your-path (git-branch-name) /dockerMachineName/ $ 

function color_my_prompt {
    local __user_and_host="\[\033[01;32m\]\u@\h"
    local __cur_location="\[\033[01;34m\]\w"
    local __git_branch_color="\[\033[31m\]"
    local __git_branch='`command git branch 2> /dev/null | /usr/bin/grep -e ^* | sed -E  s/^\\\\\*\ \(.+\)$/\(\\\\\1\)\ /`'
    local __docker_machine_name_color="\[\033[36m\]"
    local __docker_machine_name='`if [ $DOCKER_MACHINE_NAME ]; then echo "/$DOCKER_MACHINE_NAME/ "; fi`'
    local __prompt_tail="\[\033[35m\]$"
    local __last_color="\[\033[00m\]"
    export PS1="$__cur_location $__git_branch_color$__git_branch$__docker_machine_name_color$__docker_machine_name$__prompt_tail$__last_color "
}
color_my_prompt

Depending on your terminal theme, it will look similar to this,

master is the git branch and manager is the docker-machine-name that the current ENV exports.