Introduce more tools for use by plugins

node_modules/_app/clusterTools/getLua.js

@@ -0,0 +1,40 @@
+const fs = require("fs-extra");
+
+module.exports = function getLua(filePath, COMPRESS_LUA = true){
+	return new Promise((resolve, reject) => {
+		fs.readFile(filePath, "utf8", (err, contents) => {
+			if(err){
+				reject(err);
+			} else {
+				// split content into lines
+				contents = contents.split(/\r?\n/);
+
+				// join those lines after making them safe again
+				contents = contents.reduce((acc, val) => {
+					val = val.replace(/\\/g ,'\\\\');
+					// remove leading and trailing spaces
+					val = val.trim();
+					// escape single quotes
+					val = val.replace(/'/g ,'\\\'');
+
+					// remove single line comments
+					let singleLineCommentPosition = val.indexOf("--");
+					let multiLineCommentPosition = val.indexOf("--[[");
+
+					if(multiLineCommentPosition === -1 && singleLineCommentPosition !== -1) {
+						val = val.substr(0, singleLineCommentPosition);
+					}
+
+					return acc + val + '\\n';
+				}, ""); // need the "" or it will not process the first row, potentially leaving a single line comment in that disables the whole code
+
+				// console.log(contents);
+
+				// this takes about 46 ms to minify train_stop_tracking.lua in my tests on an i3 6100u
+				if(COMPRESS_LUA) contents = require("luamin").minify(contents);
+				
+				resolve(contents);
+			}
+		});
+	});
+}