#!/bin/sh

if [ "$1" = '-h' ] ; then
	echo 'Updates rustc & clippy'
	echo 'It first checks if clippy would compile at currentl nightly and if so, it updates.'
	echo 'Options:'
	echo '-h: This help message'
	echo '-f: Skips the check and just updates'
	exit
fi

set -ex

renice -n 10 -p $$

export CARGO_INCREMENTAL=0
export RUSTFLAGS='-C target-cpu=native'

try_out() {
	export RUSTUP_HOME=$HOME/.rustup-attempt
	test -d $RUSTUP_HOME || (rustup toolchain add nightly && rustup default nightly)
	rustup update
	cargo +nightly install --force clippy
	unset RUSTUP_HOME
	export RUSTUP_HOME
}

[ "$1" = '-f' ] || try_out

rustup update
cargo +nightly install --force clippy