#!/bin/sh
# fast, cross-platform

## Distro
# freedesktop.org/software/systemd/man/os-release.html
# a common file that has variables about the distro
for os in /etc/os-release /usr/lib/os-release; do
	# some POSIX shells exit when trying to source a file that doesn't exist
	[ -f $os ] && . $os && break
done

## Kernel
read -r _ _ version _ < /proc/version
kernel=${version%%-*}

## Uptime
# the simple math is shamefully stolen from aosync
IFS=. read -r uptime _ < /proc/uptime
d=$((uptime / 60 / 60 / 24))
up=$(printf %02d:%02d $((uptime / 60 / 60 % 24)) $((uptime / 60 % 60)))
[ "$d" -gt 0 ] && up="${d}d $up"

print() {
	[ "$2" ] && printf '\033[9%sm%6s\033[0m%b%s\n' \
		"${accent:-4}" "$1" "${separator:- }" "$2"
}

print dist "$ID"
print kern "$kernel"
print shll "${SHELL##*/}"
print uptm "$up"

# Colors
printf '  '
for i in 1 2 3 4 5 6; do
    printf '\033[9%sm%s' "$i" "${colourblocks:-▅▅}"
done
printf '\033[0m\n'