bash_prompt_command() {
    # How many characters of the $PWD should be kept
    local pwdmaxlen=$(( ${COLUMNS} - 11 ))
    # Indicate that there has been dir truncation
    local trunc_symbol="…"
    local dir=${PWD##*/}
    pwdmaxlen=$(( ( pwdmaxlen < ${#dir} ) ? ${#dir} : pwdmaxlen ))
    NEW_PWD=${PWD/#$HOME/\~}
    NEW_BAR="$(printf ' %.0s' $(seq 1 $COLUMNS))"
    local pwdoffset=$(( ${#NEW_PWD} - pwdmaxlen ))
    if [ ${pwdoffset} -gt "0" ]
    then
        NEW_PWD=${NEW_PWD:$pwdoffset:$pwdmaxlen}
        NEW_PWD=${trunc_symbol}/${NEW_PWD#*/}
    fi
}

bash_prompt() {
    case $TERM in
     xterm*|rxvt*)
         local TITLEBAR='\[\033]0;\u:${NEW_PWD}\007\]'
          ;;
     *)
         local TITLEBAR=""
          ;;
    esac
    local NONE="\[\033[0m\]"    # unsets color to term's fg color
    
    # regular colors
    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 BAR_ON="\[\033[4;44;37m\]"
    local BAR_OFF="\[\033[1;0m\]"
    local UC=$W                 # user's color
    [ $UID -eq "0" ] && UC=$R   # root's color

    HOST_ICO="  "
    hosthash=$(hostname | md5sum | cut -c1)
    [[ $hosthash == "a" ]] && HOST_ICO="${EMM} "
    [[ $hosthash == "9" ]] && HOST_ICO="${EMG} "
    [[ $hosthash == "5" ]] && HOST_ICO="${EMB}⭘ "
    
    PS1="${TITLEBAR}${BAR_ON}\${NEW_BAR}${BAR_OFF}\r\n\t${HOST_ICO}${EMY}\${NEW_PWD}${EMK}]${UC}\n\\$ ${NONE}"
    #PS1="${TITLEBAR}${BAR_ON}$(printf '_%.0s' $(seq 1 $(tput cols)))${BAR_OFF}\r\n ${NEW_PWD} :\n\$ "
    #PS1='\[\033]0;\u - \w\007\]\[\033[44;37m\]'$(printf '_%.0s' $(seq 1 $(tput cols)))'\[\033[1;0m\]\r\n\t \w :\n\$ '
    # without colors: PS1="[\u@\h \${NEW_PWD}]\\$ "
    # extra backslash in front of \$ to make bash colorize the prompt
}
PROMPT_COMMAND=bash_prompt_command
bash_prompt
unset bash_prompt