ci: download lua-language-server binary

scripts/lls-check

@@ -2,12 +2,28 @@
 
 # Performs a lua-language-server check on all files.
 # lls-check/check.json will be produced on any issues, returning 1.
+# Outputs check.json to stdout, all messages to stderr, to allow jq etc.
 
-rm -rf lls-check
-mkdir lls-check
+VER_LLS="3.7.3"
 
-OUT=$(lua-language-server --checklevel=Information --check . --logpath=lls-check --loglevel=error)
-echo "${OUT}"
+DIR_SRC="${PWD}"
+DIR_OUT="${DIR_SRC}/lls-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 "${DIR_LLS}"
+fi
+
+# execute from within the lua-language-server directory as it expects specific file locations
+cd "${DIR_LLS}"
+OUT=$("${DIR_LLS}/bin/lua-language-server" --checklevel=Information --check "${DIR_SRC}" --logpath="${DIR_OUT}" --loglevel=error)
+echo "${OUT}" >&2
 
 RC=$?
 if [ $RC -ne 0 ]; then
@@ -15,9 +31,11 @@ if [ $RC -ne 0 ]; then
 	exit $RC
 fi
 
+# any output is a fail
 case "${OUT}" in
-	*Diagnosis\ completed*)
-		if [ -f "lls-check/check.json" ]; then
+	*Diagnosis\ complete*)
+		if [ -f "${DIR_OUT}/check.json" ]; then
+			cat "${DIR_OUT}/check.json"
 			exit 1
 		else
 			exit 0