adding git information to bash prompt on macOS

.bash_profile

## assuming you have git installed via Homebrew
##  the prompt files needed are located here:  /usr/local/etc/bash_completion.d/

## first, add this to your ~/.bash_profile
source /usr/local/etc/bash_completion.d/git-prompt.sh
# another ways is:  source $(brew --prefix)/etc/bash_completion.d/git-prompt.sh

## if you also want git command completion, then add this too:
source /usr/local/etc/bash_completion.d/git-completion.bash
# another way is:  source $(brew --prefix)/etc/bash_completion.d/git-completion.bash

GIT_PS1_SHOWUPSTREAM="auto"
GIT_PS1_SHOWCOLORHINTS="yes"

#PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\$ "'
PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
#PS1="\h:\W \u\$(__git_ps1 \" (%s) \")\$"

## I'm not entirely satisfied with this, but this is what I have so far...