format_seconds

#!/usr/bin/env bash

show_help() {
	cat << __EOF__
Takes unsigned integer/decimal seconds and prints them as simple hours, minutes, & seconds as the time overflows.

Usage:	$0 SECONDS
	or:	$0 --help
	or:	$0 --version

Options:
	
__EOF__
}
show_version() {
	cat << __EOF__
$0 4.0.0

Copyright (C) 2025 Justin Morris
__EOF__
}

declare formatStr=''
declare sign=''
declare -i timeInput=0
shopt -s 'extglob'
allowContinue='true'
while eval "$allowContinue" && (( $# > 0 )); do
	case "$1" in
		(-h | --help)
			show_help
			exit
			;;
		(-v | --version)
			show_version
			exit
			;;
		(*)
			allowContinue='false'
			;;
	esac
done

if [[ "$1" =~ ^(-?)([[:digit:]]+)(\.[[:digit:]]*)$ ]]; then
	declare -r sign="${BASH_REMATCH[1]}"
	declare -ir timeInput="${BASH_REMATCH[2]}"
	declare formatStr="S${BASH_REMATCH[3]}"
elif [[ "$1" =~ ^(-?)(\.[[:digit:]]+)$ ]]; then
	declare -r sign="${BASH_REMATCH[1]}"
	declare -ir timeInput=0
	declare formatStr="S${BASH_REMATCH[2]}"
else
	declare -r sign=''
	declare -ir timeInput="$1"
	declare formatStr="S"
fi
if ((timeInput >= 86400)); then formatStr="$((timeInput / 86400))days %H hrs %M min %$formatStr s"
elif ((timeInput >= 3600)); then formatStr="%-H:%M:%$formatStr"
elif ((timeInput >= 60)); then formatStr="%-M:%$formatStr"
else formatStr="%-${formatStr}s"
fi
date -u -d "@$timeInput" +"$sign$formatStr"