Add pre-commit hook

Author: sky1e

pre-commit.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+# https://stackoverflow.com/questions/26886363/git-how-to-re-stage-the-staged-files-in-a-pre-commit-hook/39521255#39521255
+STASH_NAME="pre-commit-$(date +%s)"
+git stash save --quiet --keep-index --include-untracked $STASH_NAME
+
+./tests.sh
+
+RESULT=$?
+if [ $RESULT -ne 0 ]; then
+	git stash save -q "original index"
+	git stash apply -q --index stash@{1}
+	git stash drop -q; git stash drop -q
+fi
+[ $RESULT -ne 0 ] && exit 1
+
+git add -u

tests.sh

@@ -0,0 +1,6 @@
+cargo fmt --all --check
+cargo test --quiet --locked
+cargo clippy -- --deny warnings
+cargo clippy --tests -- --deny warnings
+find . -name '*.nix' -exec nix fmt {} \+
+nix flake check