Move config check into js folder, cleanup var usage

js/check_config.js

@@ -0,0 +1,69 @@
+/* Magic Mirror
+ *
+ * Checker configuration file
+ *
+ * By Rodrigo Ramírez Norambuena
+ *    https://rodrigoramirez.com
+ *
+ * MIT Licensed.
+ *
+ */
+
+const Linter = require("eslint").Linter;
+const linter = new Linter();
+
+const path = require("path");
+const fs = require("fs");
+
+const rootPath = path.resolve(__dirname + "/../");
+const config = require(rootPath + "/.eslintrc.json");
+const Utils = require(rootPath + "/js/utils.js");
+
+/* getConfigFile()
+ * Return string with path of configuration file
+ * Check if set by environment variable MM_CONFIG_FILE
+ */
+function getConfigFile() {
+	// FIXME: This function should be in core. Do you want refactor me ;) ?, be good!
+	let configFileName = path.resolve(rootPath + "/config/config.js");
+	if (process.env.MM_CONFIG_FILE) {
+		configFileName = path.resolve(process.env.MM_CONFIG_FILE);
+	}
+	return configFileName;
+}
+
+function checkConfigFile() {
+	const configFileName = getConfigFile();
+	// Check if file is present
+	if (fs.existsSync(configFileName) === false) {
+		console.error(Utils.colors.error("File not found: "), configFileName);
+		return;
+	}
+	// check permission
+	try {
+		fs.accessSync(configFileName, fs.F_OK);
+	} catch (e) {
+		console.log(Utils.colors.error(e));
+		return;
+	}
+
+	// Validate syntax of the configuration file.
+	// In case the there errors show messages and
+	// return
+	console.info(Utils.colors.info("Checking file... "), configFileName);
+	// I'm not sure if all ever is utf-8
+	fs.readFile(configFileName, "utf-8", function (err, data) {
+		if (err) { throw err; }
+		const messages = linter.verify(data, config);
+		if (messages.length === 0) {
+			console.log("Your configuration file doesn't contain syntax errors :)");
+			return true;
+		} else {
+			messages.forEach(error => {
+				console.log("Line", error.line, "col", error.column, error.message);
+			});
+		}
+	});
+}
+
+checkConfigFile();