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rc/sh/monitor

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#!/bin/zsh
local bottom=0 strip=0 opt=
while getopts 'fsh' opt; do
case $opt in
f) bottom=1;; # align with bottom of terminal
s) strip=1;; # strip last character assuming it's a newline
?) echo -E "usage: $0 [-fs] {period} {program}"
[ $opt = h ] && return 0 || return 1;;
esac
done
shift $((OPTIND-1))
local time=$1
local cmd=$2
function _monclear() {
[ $bottom -eq 1 ] && printf ${(l:$((LINES*2))::\n:)}
}
function _monfit() {
if [ $strip -eq 1 ]; then
tail -$((LINES)) | head -c-1
else
tail -$((LINES-1))
fi
}
local stop=0
trap stop=1 INT
echo -en "\e[H\e[2J"
while [ $stop -eq 0 ]; do
echo -en "\e[1J\e[H"
{ _monclear; $cmd 2>&1 } | fold -w $COLUMNS | _monfit
sleep $time || break
done