__truncate_left() {
    local str="$1"
    local maxlen="$2"
    local trunc_symbol="$3"
    local sep_symbol="$4"

    # get minimum length to not truncate a long name
    if [ -n "$sep_symbol" ]
    then
        local component=${1##*$sep_symbol}
        maxlen=$(( ( maxlen < ${#component} ) ? ${#component} : maxlen ))
    fi

    # truncation point
    local offset=$(( ${#str} - maxlen ))

    if [ ${offset} -gt "0" ]
    then
        #truncation is needed
        str=${str:$offset:$maxlen}  #truncate
        str=${trunc_symbol}/${str#*/}  #add symbol
    fi
    echo "$str"
}

__truncate_dir() {
    #gain some place with '~'
    dir=${1/#$HOME/\~}
    __truncate_left "$dir" 25 '…' '/'
}

__tpwd() {
    __truncate_dir "$PWD"
}

__set_bash_ps1() {

    # load color vars
    source "$DOTFILES_BASH_DIR/ansi_colors"

    # colorized:
    PS1=" ${B}[${UC}\u@\h ${G}\$(__tpwd)${B}]${UC}\\$ ${NONE}"
}

__set_bash_ps1
unset __set_bash_ps1

# vim: ft=sh