BASE_REF ?= main
HEAD_REF ?= $(shell git rev-parse HEAD)

.PHONY: review
review:
	@echo "Ensuring Cargo.lock is in clean state, not modified"
	test -z "$(shell git status --porcelain | grep -E 'M +Cargo.lock')"
	@echo "Ensuring current HEAD_REF is not BASE_REF"
	test "$(shell git rev-parse $(BASE_REF))" != "$(HEAD_REF)"
	@echo "Verifying if any changes happened in Cargo.lock that require review"
	test "$(shell git show $(BASE_REF):Cargo.lock | sha256sum)" != "$(shell git show $(HEAD_REF):Cargo.lock | sha256sum)"
	$(eval TEMP_REPO := $(shell mktemp -d))
	git -C $(TEMP_REPO) init
	# Fetch files for BASE_REF
	git show $(BASE_REF):Cargo.lock > $(TEMP_REPO)/Cargo.lock
	CARGO_HOME=$(TEMP_REPO)/cargo-home cargo fetch
	git -C $(TEMP_REPO) add .
	git -C $(TEMP_REPO) commit --no-gpg-sign -m "base ref: $(BASE_REF)"
	# Fetch files for HEAD_REF
	git show $(HEAD_REF):Cargo.lock > $(TEMP_REPO)/Cargo.lock
	CARGO_HOME=$(TEMP_REPO)/cargo-home cargo fetch
	git -C $(TEMP_REPO) add -A .
	git -C $(TEMP_REPO) difftool HEAD || true
	rm -rf $(TEMP_REPO)