#!/usr/bin/env bash
# === RUST-PSBT-V0 GITHOOK ===

# Scan the githooks after merge. If the user is using any of the rust-psbt-v2
# githooks and they have changed, let them know to rerun the githooks setup.

# We only care about this on master
[[ "$(git branch --show-current)" = "master" ]] || exit

# Get the local githooks directory, regardless of configuration.
GIT_DIR=$(git rev-parse --git-common-dir)
HOOKS_DIR=$(git config --get core.hooksPath || echo "$GIT_DIR/hooks")

# Scan each of the hooks looking for the tag. If the tag is found, then the user
# is using a rust-bitcoin githook. We should compare them to the repo's hooks to
# see if they have changed in the latest git pull.
for hook in "$HOOKS_DIR"/*
do
	if grep -q '=== RUST-PSBT-V0 GITHOOK ===' "$hook"; then
		BN=$(basename "$hook")
		if ! cmp --quiet "$hook" "githooks/$BN"; then
			>&2 cat <<- EOF
			==================================================
			Project githooks have changed. Please inspect the
			changes and re-reun \`just githooks-install\` if
			they are legitimate.

			Remove $HOOKS_DIR/post-merge to skip this warning
			in the future.
			==================================================
			EOF
			exit
		fi
	fi
done