#!/usr/bin/env nix-shell
#!nix-shell -i zsh --packages nvd zsh

zmodload zsh/zutil
zparseopts -D -E -A opts -- -flake:- h u x

if (( ${+opts[-x]} )); then
	set -x
fi

if (( ${+opts[-h]} )); then
	<<EOF >&2
usage: ${0:t} [ --flake name ] [ -h ] [ -u ] [ -x ]

	--flake	build the system from the specified flake
	-h	this message
	-u	update flake.lock before rebuilding
	-x	enable shell debugging
EOF
	exit 1
fi

if (( ${+opts[-flake]} )); then
	args=("--flake ${opts[-flake]}" ${=@})
else
	args=("--flake .#$(hostname -s)" ${=@})
fi

cd /etc/nixos && \
	if (( ${+opts[-u]} )); then nix flake update; fi && \
	nixos-rebuild switch --show-trace ${=args} && \
	echo && \
	nixos-rebuild list-generations | cat && \
	echo && \
	res=$(find /nix/var/nix/profiles -iname system-\* -type l -exec ls -ltr \{\} + | awk '{print $9}' | tail -2)

if [[ ${?} -eq 0 && $(echo -E "${res}" | wc -l) -eq 2 ]]; then
	nvd diff $(echo -E "${res}" | xargs)
fi