Bash prompt with git support

.prompt

# source /usr/local/etc/bash_completion.d/git-prompt.sh
PROMPT_COMMAND=__generate_prompt

__generate_prompt() {
# Undocumented function that updates OS X Terminal\'s knowledge of
# the current
# working directory. Required for Cmd + T to open a new tab in the same
# directory.
#
# See '/etc/bashrc' on an OS X box for details.
# update_terminal_cwd

# ==> Configure Git prompt
local GIT_PS1_SHOWCOLORHINTS=1
local GIT_PS1_SHOWDIRTYSTATE=1
local GIT_PS1_SHOWSTASHSTATE=1
local GIT_PS1_SHOWUNTRACKEDFILES=1
local GIT_PS1_SHOWUPSTREAM="auto verbose"

# ==> Display Python virtual environment when active
if [[ "${VIRTUAL_ENV}" ]]; then
local PS1_VENV="$(color "({purple}$(basename
"${VIRTUAL_ENV}"){clear})") "
fi

# ==> Colorize pre/post Git status strings.
# Set `$PS1_HOOK` to add additional text to the prompt.
local PS1_PRE="$(color "\n[{bold}{purple}\w{clear}]
${PS1_VENV}${PS1_HOOK}")"
local PS1_POST="$(color "\n{cyan}\u{clear}@{bold}\h{clear}$ ")"

__git_ps1 "${PS1_PRE}" "${PS1_POST}"
}

_format_codes=(
clear # reset
black red green yellow # colors
blue purple cyan white
bold dim # bold/bright, unbold/dim
rev # reverse video
under nounder # underline, nounderline
)

_format_escapes=(
"$(tput sgr0)"
"$(tput setaf 0)" "$(tput setaf 1)" "$(tput setaf 2)" "$(tput setaf 3)"
"$(tput setaf 4)" "$(tput setaf 5)" "$(tput setaf 6)" "$(tput setaf 7)"
"$(tput bold)" "$(tput dim)"
"$(tput rev)"
"$(tput smul)" "$(tput rmul)"
)

color() {
local strings="$@" match replace
for (( i=0; i < ${#_format_codes[@]}; ++i )); do
match="{${_format_codes[i]}}"
replace="\[${_format_escapes[i]}\]"
strings=${strings//${match}/${replace}}
done
echo "${strings[@]}"
}