mirror of
https://github.com/notwa/rc
synced 2024-11-05 02:29:06 -08:00
50 lines
1.5 KiB
Bash
Executable file
50 lines
1.5 KiB
Bash
Executable file
#!/usr/bin/env zsh
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# compat: -ash -bash -dash -hush -ksh -mksh -oksh -osh -posh -yash +zsh
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monitor() { ### @-
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### this is [watch(1)](https://www.man7.org/linux/man-pages/man1/watch.1.html)
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### loosely reimplemented as a shell script.
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###
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### ```
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### usage: monitor [-fs] [-n {period}] {command} [{args...}]
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### ```
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###
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### **NOTE:** there also exists monitor(1) programs provided by
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### the *389-ds-base* and *dmucs* packages that i don't use.
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local bottom=0 strip=0 interval=2 opt=
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while getopts 'fsn:h' opt; do
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case $opt in
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f) bottom=1;; # align with bottom of terminal
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s) strip=1;; # strip last character assuming it's a newline
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n) interval="$OPTARG";;
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?) echo -E "usage: $0 [-fs] [-n {period}] {command} [{args...}]"
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[ $opt = h ] && return 0 || return 1;;
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esac
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done
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shift $((OPTIND-1))
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local cmd=${1:?no command specified}
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shift
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function _monclear() {
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[ $bottom -eq 1 ] && printf ${(l:$((LINES*2))::\n:)}
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}
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function _monfit() {
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if [ $strip -eq 1 ]; then
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tail -$((LINES)) | head -c-1
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else
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tail -$((LINES-1))
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fi
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}
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local stop=0
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trap stop=1 INT
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echo -en "\e[H\e[2J"
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while [ $stop -eq 0 ]; do
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echo -en "\e[1J\e[H"
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{ _monclear; "$cmd" "$@" 2>&1 } | fold -w $COLUMNS | _monfit
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sleep "$interval" || break
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done
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}
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[ -n "${preload+-}" ] || monitor "$@"
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