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|
# License at bottom
[[ $- == *i* ]] || return 0
basta_old_cmdno=${basta_old_cmdno-0}
basta_old_lines=${basta_old_lines-0}
basta_old_cols=${basta_old_cols-0}
basta_scroll_lines=${basta_scroll_lines-0}
basta_prev_reserved_rows=${basta_prev_reserved_rows-}
basta_status_alarm_pid=${basta_status_alarm_pid-}
basta.query_terminal_lines()
{
local esc=$(printf "\033")
local -n intovar=$1
printf "${esc}7$esc[999;999H"
local realrows=$(basta.get_cur_line)
printf "${esc}8"
intovar=$realrows
}
basta.prepare_term()
{
if [ -z "$basta_prev_reserved_rows" ] ; then
local realrows
basta.query_terminal_lines realrows
basta_prev_reserved_rows=$((realrows - LINES))
printf "\n\033[A"
else
basta.query_terminal_lines LINES
fi
basta_scroll_lines=$((LINES - 1))
stty rows $basta_scroll_lines
basta_old_lines=$LINES
basta_old_cols=$COLUMNS
}
basta.get_cur_line()
{
local esc=$(printf "\033")
local response=$LINES
printf "$esc[6n" > /dev/tty
read -t 3 -s -d R response < /dev/tty
local IFS="[;"
set -- $response
printf "%s\n" "$2"
}
basta.update_status()
{
local esc=$(printf "\033")
local pwd=$PWD
local dots=
[ $LINES -eq $basta_old_lines -a \
$COLUMNS -eq $basta_old_cols ] || basta.prepare_term
local status_esc="$esc[7m$esc[m"
local status_date=$(date +%m-%d/%H:%M)
while true; do
local status="$esc[7m$status_date$esc[m $HOSTNAME $dots$pwd"
local status_len=$((${#status} - ${#status_esc}))
[ $status_len -le $COLUMNS ] && break
pwd=${pwd#/}
pwd=/${pwd#*/}
dots='...'
[ "${pwd#/*/}" == "$pwd" ] && break
done
status_len=$((${#status} - ${#status_esc}))
[ $status_len -gt $COLUMNS ] && status=
printf "${esc}7$esc[%s;1H$esc[K%s$esc[1;%sr${esc}8" \
$((basta_scroll_lines + 1)) "$status" $basta_scroll_lines
}
basta.check_cursor()
{
if ! read -t 0; then
local exit=$?
local esc=$(printf "\033")
local curln=$(basta.get_cur_line)
if [ $curln -gt $basta_scroll_lines ]; then
printf "$esc[%s;1H" $basta_scroll_lines
fi
fi
}
basta.do_exit_status()
{
local exit=$1
local getcmdno='\#'
local cmdno=${getcmdno@P}
if [ $exit -ne 0 -a $cmdno -ne $basta_old_cmdno ] ; then
printf "!%s!\n" $exit
fi
basta_old_cmdno=$cmdno
}
basta.initial_prompt_hook()
{
local exit=$?
stty raw -echo onlcr opost
basta.update_status
stty sane rows $basta_scroll_lines
PROMPT_COMMAND='basta.prompt_hook'
}
basta.prompt_hook()
{
local exit=$?
stty raw -echo onlcr opost
basta.check_cursor
basta.do_exit_status $exit
basta.update_status
stty sane rows $basta_scroll_lines
}
basta.alarm_timer()
{
exec 0>&- 1>&- 2>&-
trap : INT
while
sleep 15
kill -ALRM $$
do
:
done
}
basta.install_hooks()
{
trap 'basta.update_status "$_"' ALRM WINCH
trap basta.cleanup EXIT
PROMPT_COMMAND='basta.initial_prompt_hook'
}
basta.remove_hooks()
{
trap "" ALRM WINCH
unset PROMPT_COMMAND
}
basta.cleanup()
{
local esc=$(printf "\033")
local newlines=$((LINES + 1))
printf "${esc}7"
printf "$esc[%s;1H$esc[K" $newlines
if [ $basta_prev_reserved_rows ] &&
[ $basta_prev_reserved_rows -gt 0 ]
then
printf "$esc[1;%sr" $newlines
else
printf "$esc[1r"
fi
printf "${esc}8"
stty rows $newlines
kill -KILL $basta_status_alarm_pid
basta.remove_hooks
printf "Basta!\n"
}
basta.install_hooks
if ! [ $basta_status_alarm_pid ] ; then
basta.alarm_timer &
basta_status_alarm_pid=$!
disown $!
fi
# workaround for GNU Readline behavior whereby each time it
# receives a SIGALRM, it emits cruft to the terminal.
bind 'set enable-bracketed-paste 0'
# Copyright 2023
# Kaz Kylheku <kaz@kylheku.com>
# Vancouver, Canada
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following condition is met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form need not reproduce any copyright notice.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
