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rc/sh/monitor
Connor Olding d35c492850 NixOS compatibility
* use /usr/bin/env for all hashbangs
* enable hashall for bash
* workaround syntax error in -shrc for bash
2020-12-29 18:04:04 +01:00

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#!/usr/bin/env zsh
local bottom=0 strip=0 interval=2 opt=
while getopts 'fsn:h' opt; do
case $opt in
f) bottom=1;; # align with bottom of terminal
s) strip=1;; # strip last character assuming it's a newline
n) interval="$OPTARG";;
?) echo -E "usage: $0 [-fs] [-n {period}] {command} [{args...}]"
[ $opt = h ] && return 0 || return 1;;
esac
done
shift $((OPTIND-1))
local cmd=${1:?no command specified}
shift
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 $COLUMNS | _monfit
sleep "$interval" || break
done