My Bash prompt format

bgr_PS1

#!/bin/bash
# source this in .bashrc
# changes PS1 prompt format to:
#
# ┌(user@host)─(err_code)─(time date)─(git branch)─(virtualenv)
# └─(~/working/directory) $
#
# it's based on:
# http://bash.cyberciti.biz/guide/Changing_bash_prompt
# https://wiki.archlinux.org/index.php/Color_Bash_Prompt 


GIT_PS1_SHOWDIRTYSTATE='yes'
GIT_PS1_SHOWSTASHSTATE='yes'
source ~/git-prompt.sh
# git-prompt.sh might be present on the system, otherwise it can be downloaded
# from https://github.com/git/git/blob/master/contrib/completion/git-prompt.sh


bgr_update_PS1() {
    # colors
    local NONE="\[\033[0m\]"    # unsets color to term's fg color
    local K="\[\033[0;30m\]"    # black
    local R="\[\033[0;31m\]"    # red
    local G="\[\033[0;32m\]"    # green
    local Y="\[\033[0;33m\]"    # yellow
    local B="\[\033[0;34m\]"    # blue
    local M="\[\033[0;35m\]"    # magenta
    local C="\[\033[0;36m\]"    # cyan
    local W="\[\033[0;37m\]"    # white
    # emphasized (bolded) colors
    local EMK="\[\033[1;30m\]"
    local EMR="\[\033[1;31m\]"
    local EMG="\[\033[1;32m\]"
    local EMY="\[\033[1;33m\]"
    local EMB="\[\033[1;34m\]"
    local EMM="\[\033[1;35m\]"
    local EMC="\[\033[1;36m\]"
    local EMW="\[\033[1;37m\]"
    # background colors
    local BGK="\[\033[40m\]"
    local BGR="\[\033[41m\]"
    local BGG="\[\033[42m\]"
    local BGY="\[\033[43m\]"
    local BGB="\[\033[44m\]"
    local BGM="\[\033[45m\]"
    local BGC="\[\033[46m\]"
    local BGW="\[\033[47m\]"

    local DASH="\342\224\200"  # prettier version of - character
 
    # shorten PWD
    local pwdmaxlen=40
    local trunc_symbol=".."
    local dir=${PWD##*/}
    pwdmaxlen=$(( ( pwdmaxlen < ${#dir} ) ? ${#dir} : pwdmaxlen ))
    local short_pwd=${PWD/#$HOME/\~}
    local pwdoffset=$(( ${#short_pwd} - pwdmaxlen ))
    if [ ${pwdoffset} -gt "0" ]
    then
        short_pwd=${short_pwd:$pwdoffset:$pwdmaxlen}
        short_pwd=${trunc_symbol}/${short_pwd#*/}
    fi

    # get git info if current dir is a git repo
    local git=$(__git_ps1 '%s' )

    #### assemble PS1 ####

    # newline and ascii decoration
    PS1="\n${EMK}\342\224\214"

    # current user
    local user=''
    if [[ ${EUID} == 0 ]]; then
        user="${EMR}\h"
    else
        user="${B}\u@\h"
    fi
    PS1=$PS1"${EMK}(${user}${EMK})"

    # error code of last command
    # has to be inlined since $? will be substituted later
    PS1=$PS1"${EMK}${DASH}(\$(err=\$?; if [[ \$err != 0 ]]; then echo -n '$EMR'; else echo -n '$B'; fi; echo -n "\$err")${EMK})"
    
    # time and date
    PS1=$PS1"${EMK}${DASH}(${B}\t \D{%d/%m/%Y}${EMK})"

    # git branch (if inside git repo)
    if [ -n "$git" ]; then
        PS1=$PS1"${EMK}${DASH}(${Y}${git}${EMK})"
    fi

    # python virtualenv (if currently active) (##*/ strips path)
    if [ -n "$VIRTUAL_ENV" ]; then
        PS1=$PS1"${EMK}${DASH}(${C}${VIRTUAL_ENV##*/}${EMK})"
    fi

    # newline and decoration
    PS1=$PS1"\n${EMK}\342\224\224${DASH}"

    # current directory
    PS1=$PS1"(${EMG}${short_pwd}${EMK})"
    
    # $ or #
    local term=''
    if [[ ${EUID} == 0 ]]; then
        term="${EMR}#"
    else
        term="${B}$"
    fi
    PS1=$PS1" ${term}${NONE} "

    # set terminal window title
    echo -ne "\033]0;${USER}@${HOSTNAME}: ${PWD}\007"
}
PROMPT_COMMAND=bgr_update_PS1