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>12.8. The Floating Clock Prompt</H1
><P
>I've rewritten this prompt several times. It was originally written using
octal escape sequences, but the ones I needed most for this (save and
restore cursor position) aren't honoured by one of the commonest terminal
emulators, rxvt. I rewrote it using <B
CLASS="COMMAND"
>tput</B
>, and that's
what you see here. The required <B
CLASS="COMMAND"
>tput</B
> codes seem to be
universally honoured. The body of the prompt is essentially the same as
the "Lightweight" prompt shown earlier, but a clock is kept floating in the
upper right corner of the term. It will reposition itself correctly even
if the term is resized. </P
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>#!/bin/bash
# Rewrite of "clock" using tput
function prompt_command {
# prompt_x is where to position the cursor to write the clock
let prompt_x=$(tput cols)-6
# Move up one; not sure why we need to do this, but without this, I always
# got an extra blank line between prompts
tput cuu1
tput sc
tput cup 0 ${prompt_x}
tput setaf 4 ; tput bold
echo -n "["
tput setaf 1
echo -n "$(date +%H%M)"
tput setaf 4 ; tput bold
echo -n "]"
tput rc
}
PROMPT_COMMAND=prompt_command
function clockt {
local BLUE="\[$(tput setaf 4 ; tput bold)\]"
local LIGHT_RED="\[$(tput setaf 1 ; tput bold)\]"
local WHITE="\[$(tput setaf 7 ; tput bold)\]"
local NO_COLOUR="\[$(tput sgr0)\]"
case $TERM in
xterm*|rxvt*)
TITLEBAR='\[\033]0;\u@\h:\w\007\]'
;;
*)
TITLEBAR=""
;;
esac
PS1="${TITLEBAR}\
$BLUE[$LIGHT_RED\u@\h:\w$BLUE]\
$WHITE\$$NO_COLOUR "
PS2='> '
PS4='+ '
} </PRE
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>The floating clock prompt in action. The clock will stay in correct
position even if the term is resized. </P
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