#!/usr/bin/env fish

set -f os (uname)

switch $os
    case Darwin
        set -f config_dir "$HOME/.config/nixpkgs"
    case Linux
        set -f config_dir /etc/nixos
    case '*'
        echo "Unsupported OS"
        exit 1
end

pushd "$config_dir"
rm -rf result

set system_old (readlink /run/current-system)

switch $os
    case Darwin
        git pull
        env TERM=xterm-256color darwin-rebuild switch --flake .
    case Linux
        sudo git pull
        sudo nixos-rebuild switch --flake .
end

rm -f result

set system_new (readlink /run/current-system)
nvd diff "$system_old" "$system_new"

popd