| Bash Prompt HOWTO: $Revision: 0.89 $, $Date: 2001/08/22 00:57:34 $ | ||
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| Prev | Chapter 12. Example Prompts | Next |
This is one of the more attractive (and useless) prompts I've made. Because many X terminal emulators don't implement cursor position save and restore, the alternative when putting a clock in the upper right corner is to anchor the cursor at the bottom of the terminal. This builds on the idea of the "termwide" prompt above, drawing a line up the right side of the screen from the prompt to the clock. A VGA font is required.
Note: There is an odd substitution in here, that may not print properly being translated from SGML to other formats: I had to substitute the screen character for \304 - I would normally have just included the sequence "\304", but it was necessary to make this substitution in this case.
#!/bin/bash
# This prompt requires a VGA font. The prompt is anchored at the bottom
# of the terminal, fills the width of the terminal, and draws a line up
# the right side of the terminal to attach itself to a clock in the upper
# right corner of the terminal.
function prompt_command {
# Calculate the width of the prompt:
hostnam=$(echo -n $HOSTNAME | sed -e "s/[\.].*//")
# "whoami" and "pwd" include a trailing newline
usernam=$(whoami)
newPWD="${PWD}"
# Add all the accessories below ...
let promptsize=$(echo -n "--(${usernam}@${hostnam})---(${PWD})-----" \
| wc -c | tr -d " ")
# Figure out how much to add between user@host and PWD (or how much to
# remove from PWD)
let fillsize=${COLUMNS}-${promptsize}
fill=""
# Make the filler if prompt isn't as wide as the terminal:
while [ "$fillsize" -gt "0" ]
do
fill="${fill}�"
# The A with the umlaut over it (it will appear as a long dash if
# you're using a VGA font) is \304, but I cut and pasted it in
# because Bash will only do one substitution - which in this case is
# putting $fill in the prompt.
let fillsize=${fillsize}-1
done
# Right-truncate PWD if the prompt is going to be wider than the terminal:
if [ "$fillsize" -lt "0" ]
then
let cutt=3-${fillsize}
newPWD="...$(echo -n $PWD | sed -e "s/\(^.\{$cutt\}\)\(.*\)/\2/")"
fi
#
# Create the clock and the bar that runs up the right side of the term
#
local LIGHT_BLUE="\033[1;34m"
local YELLOW="\033[1;33m"
# Position the cursor to print the clock:
echo -en "\033[2;$((${COLUMNS}-9))H"
echo -en "$LIGHT_BLUE($YELLOW$(date +%H%M)$LIGHT_BLUE)\304$YELLOW\304\304\277"
local i=${LINES}
echo -en "\033[2;${COLUMNS}H"
# Print vertical dashes down the side of the terminal:
while [ $i -ge 4 ]
do
echo -en "\033[$(($i-1));${COLUMNS}H\263"
let i=$i-1
done
let prompt_line=${LINES}-1
# This is needed because doing \${LINES} inside a Bash mathematical
# expression (ie. $(())) doesn't seem to work.
}
PROMPT_COMMAND=prompt_command
function clock3 {
local LIGHT_BLUE="\[\033[1;34m\]"
local YELLOW="\[\033[1;33m\]"
local WHITE="\[\033[1;37m\]"
local LIGHT_GRAY="\[\033[0;37m\]"
local NO_COLOUR="\[\033[0m\]"
case $TERM in
xterm*)
TITLEBAR='\[\033]0;\u@\h:\w\007\]'
;;
*)
TITLEBAR=""
;;
esac
PS1="$TITLEBAR\
\[\033[\${prompt_line};0H\]
$YELLOW\332$LIGHT_BLUE\304(\
$YELLOW\${usernam}$LIGHT_BLUE@$YELLOW\${hostnam}\
${LIGHT_BLUE})\304${YELLOW}\304\${fill}${LIGHT_BLUE}\304(\
$YELLOW\${newPWD}\
$LIGHT_BLUE)\304$YELLOW\304\304\304\331\
\n\
$YELLOW\300$LIGHT_BLUE\304(\
$YELLOW\$(date \"+%a,%d %b %y\")\
$LIGHT_BLUE:$WHITE\$$LIGHT_BLUE)\304\
$YELLOW\304\
$LIGHT_GRAY "
PS2="$LIGHT_BLUE\304$YELLOW\304$YELLOW\304$NO_COLOUR "
}
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