##################################################
# The home directory (HOME) is replaced with a ~
# The last pwdmaxlen characters of the PWD are displayed
# Leading partial directory names are striped off
# /home/me/stuff          -> ~/stuff              if USER=me
# /usr/share/big_dir_name -> …/share/big_dir_name if pwdmaxlen=20
##################################################
bash_prompt_command() {
    # How many characters of the $PWD should be kept
    local pwdmaxlen=25
    # How to indicate that there has been dir truncation
    local trunc_symbol="…"

    # get minimum length to not truncate a long name
    local dir=${PWD##*/}                #'.' real name
    pwdmaxlen=$(( ( pwdmaxlen < ${#dir} ) ? ${#dir} : pwdmaxlen ))

    NEW_PWD=${PWD/#$HOME/\~}            #gain some place with '~'
    local pwdoffset=$(( ${#NEW_PWD} - pwdmaxlen ))  #get truncation point
    if [ ${pwdoffset} -gt "0" ]         #truncation is needed
    then
        NEW_PWD=${NEW_PWD:$pwdoffset:$pwdmaxlen}  #truncate
        NEW_PWD=${trunc_symbol}/${NEW_PWD#*/}  #add symbol
    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 UC=$W                 # user's color
    [ $UID -eq "0" ] && UC=$R   # root's color
    
    # colorized:
    PS1="${TITLEBAR} ${EMC}[${UC}\u${EMC}@${UC}\h ${EMB}\${NEW_PWD}${EMC}]${UC}\\$ ${NONE}"
    # without colors:
    #PS1="${TITLEBAR}[\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

# vim: set filetype=sh :