clock

#!/bin/bash

USAGE="$0 [FORMAT]"
[ "$1" == "--help" ] && { echo "$USAGE" >&2; exit 255; }

FORMAT="${1:-%T}"
BANNER="${BANNER:-banner}"
TIMEZONES=( # SGR format, timezone
	"35 UTC"
	"36 America/Los_Angeles"
)
ADD_28HR="Australia/Sydney 0" # base time zone, start hour offset
ADD_CUSTOM=

# Bustime
#ADD_CUSTOM='echo $(( ($(date +%s)-1763161200) / 3600 ))' # DB2025

# CPU temp
ADD_CUSTOM="echo -en '\e[31m'; sensors | awk '\$1 == \"Tctl:\" {printf \"%d°\", \$2}'"

# Translate 28hr arg
if [ -n "$ADD_28HR" ]; then
	read TZ_28 OFFSET_28 <<<"$ADD_28HR"
	hour28() {
		# NOTE: this will break if time zone is ever a non-hour offset.
		# We strip leading zeroes as otherwise bash interprets them as octal
		# (and 10#-08 doesn't work either, it would need to be -10#08)
		TZ_OFFSET=$(TZ="$TZ_28" date +%:::z | sed 's/0\([0-9]\)/\1/')
		printf '%02d' $(( ($(date +%s) / 3600 - OFFSET_28 + TZ_OFFSET) % 28 ))
	}
fi

# show cursor on exit
trap 'echo -en "\e[?25h"' exit
# hide cursor
echo -en "\e[?25l"

while sleep 1; do
	[ -n "$ADD_CUSTOM" ] && CUSTOM=$(bash -c "$ADD_CUSTOM")
	clear
	$BANNER "$(date "+$FORMAT")"
	line=1
	for item in "${TIMEZONES[@]}"; do
		read format tz <<<"$item"
		echo -en "\e[s\e[$((line++));1H\e[${format}m$(TZ="$tz" date +%H)\e[m\e[u"
	done
	[ -n "$ADD_CUSTOM" ] && echo -en "\e[s\e[6;1H\e[36;1m$CUSTOM\e[m\e[u"
	[ -n "$ADD_28HR" ] && echo -en "\e[s\e[6;999H\e[D\e[33m$(hour28)\e[m\e[u"
done