bash_profile.md

Function from Karl Broman. Copy the text below in your .bash_profile file for Mac OS.

function color_my_prompt {
    local __user_and_host="\[\033[01;32m\]\u@\h"
    local __cur_location="\[\033[01;34m\]\w"
    local __git_branch='`git branch 2> /dev/null | grep -e ^* | sed -E  s/^\\\\\*\ \(.+\)$/\(\\\\\1\)\ /`'
    local __prompt_tail="\[\033[35m\]$"
    local __last_color="\[\033[00m\]"

    RED="\[\033[0;31m\]"
    YELLOW="\[\033[0;33m\]"
    GREEN="\[\033[0;32m\]"

    # Capture the output of the "git status" command.
    git_status="$(git status 2> /dev/null)"

    # Set color based on clean/staged/dirty.
    if [[ ${git_status} =~ "working tree clean" ]]; then
        state="${GREEN}"
    elif [[ ${git_status} =~ "Changes to be committed" ]]; then
        state="${YELLOW}"
    else
        state="${RED}"
    fi

#    export PS1="$__user_and_host $__cur_location ${state}$__git_branch$__prompt_tail$__last_color "
    export PS1="${state}$__git_branch$__prompt_tail$__last_color "
}

# Tell bash to execute this function just before displaying its prompt.
PROMPT_COMMAND=color_my_prompt