git prompt setup for mac ~/.bash_profile, with active python virtualenv

git-prompt.sh

export BASH_SILENCE_DEPRECATION_WARNING=1

eval "$(/opt/homebrew/bin/brew shellenv)"

# --- git command prompt ---
# Pre-requisites:
#   brew install bash-completion
if [ -f $(brew --prefix)/etc/bash_completion ]; then
  . $(brew --prefix)/etc/bash_completion
fi

source $(brew --prefix)/etc/bash_completion.d/git-completion.bash
source $(brew --prefix)/etc/bash_completion.d/git-prompt.sh
export GIT_PS1_SHOWDIRTYSTATE=true
export GIT_PS1_SHOWUPSTREAM=true
export GIT_PS1_SHOWCOLORHINTS=true #this only works when using PROMPT_COMMAND instead of PS1
export VIRTUAL_ENV_DISABLE_PROMPT=1

#This is a function call: __git_ps1(pre, post)
#pre is the part of the prompt before the branch status
#post is the part of the prompt after the branch status
#See https://github.com/git/git/blob/e5da8655b23737a8449868e1d99973a8d0e25fe3/contrib/completion/git-prompt.sh#L23
GREEN='\e[38;5;64m'
YELLOW='\e[38;5;11m'
DARK_GRAY='\e[90m'
WORKING_DIRECTORY='\w'
RESET_COLORS='\e[0m'

# Create an env var with the value of the current python virtualenv
set_active_venv() {
    export ACTIVE_VENV=""
    if [ "$VIRTUAL_ENV" != "" ]; then
        export ACTIVE_VENV="$DARK_GRAY[`basename \"$VIRTUAL_ENV\"`]$RESET_COLORS"
    fi
}

# Update prompt to show git status and, when present, current python virtualenv
export PROMPT_COMMAND='set_active_venv; __git_ps1 "\n$GREEN$WORKING_DIRECTORY$RESET_COLORS" " $ACTIVE_VENV\nλ "'