add scripts/luals-check, not quite ready for CI

.gitignore

@@ -0,0 +1 @@
+/luals-out/

scripts/luals-check

@@ -0,0 +1,47 @@
+#!/bin/sh
+
+# Performs a lua-language-server check on all files.
+# luals-out/check.json will be produced on any issues, returning 1.
+# Outputs only check.json to stdout, all other messages to stderr, to allow jq etc.
+
+VER_LLS="3.7.3"
+
+DIR_SRC="${PWD}"
+DIR_OUT="${DIR_SRC}/luals-out"
+DIR_LLS="/tmp/lls"
+
+# clear output
+rm -rf "${DIR_OUT}"
+mkdir "${DIR_OUT}"
+
+if [ ! -d "${DIR_LLS}" ]; then
+	# download lua-language-server binaries
+	mkdir -p "${DIR_LLS}"
+	curl -L "https://github.com/LuaLS/lua-language-server/releases/download/${VER_LLS}/lua-language-server-${VER_LLS}-linux-x64.tar.gz" | tar zx --directory "${DIR_LLS}"
+fi
+
+# execute from within the lua-language-server directory as it expects specific file locations
+OUT=$("${DIR_LLS}/bin/lua-language-server" --checklevel=Information --check "${DIR_SRC}" --logpath="${DIR_OUT}" --loglevel=error)
+RC=$?
+
+echo "${OUT}" >&2
+
+if [ $RC -ne 0 ]; then
+	exit $RC
+fi
+
+# any output is a fail
+case "${OUT}" in
+	*Diagnosis\ complete*)
+		if [ -f "${DIR_OUT}/check.json" ]; then
+			cat "${DIR_OUT}/check.json"
+			exit 1
+		else
+			exit 0
+		fi
+		;;
+	*)
+		exit 1
+		;;
+esac
+