add option support for overwriting settiings.js

packages/node_modules/node-red/red.js

@@ -39,7 +39,8 @@ var knownOpts = {
     "title": String,
     "userDir": [path],
     "verbose": Boolean,
-    "safe": Boolean
+    "safe": Boolean,
+    "define": [String, Array]
 };
 var shortHands = {
     "?":["--help"],
@@ -49,7 +50,8 @@ var shortHands = {
     // doesn't get treated as --title
     "t":["--help"],
     "u":["--userDir"],
-    "v":["--verbose"]
+    "v":["--verbose"],
+    "D":["--define"]
 };
 nopt.invalidHandler = function(k,v,t) {
     // TODO: console.log(k,v,t);
@@ -57,6 +59,28 @@ nopt.invalidHandler = function(k,v,t) {
 
 var parsedArgs = nopt(knownOpts,shortHands,process.argv,2)
 
+/** 
+ * Set property of specified object.
+ * @param {Object} obj - target object
+ * @param {string} path - "." separated property path
+ * @param {Object} val - value to be set
+ */
+function setProperty(obj, path, val) {
+    var paths = path.split(".");
+    if (paths.length > 0) {
+        var o = obj;
+        for (var i = 0; i < paths.length -1; i++) {
+            var path = paths[i];
+            if (!o.hasOwnProperty(path)) {
+                o[path] = {};
+            }
+            o = o[path];
+        }
+        var key = paths[paths.length-1];
+        o[key] = val;
+    }
+}
+
 if (parsedArgs.help) {
     console.log("Node-RED v"+RED.version());
     console.log("Usage: node-red [-v] [-?] [--settings settings.js] [--userDir DIR]");
@@ -69,6 +93,7 @@ if (parsedArgs.help) {
     console.log("  -u, --userDir  DIR   use specified user directory");
     console.log("  -v, --verbose        enable verbose output");
     console.log("      --safe           enable safe mode");
+    console.log("  -D, --define   X=Y   overwrite value in settings file");
     console.log("  -?, --help           show this help");
     console.log("");
     console.log("Documentation can be found at http://nodered.org");
@@ -130,6 +155,33 @@ try {
     process.exit();
 }
 
+if (parsedArgs.define) {
+    var defs = parsedArgs.define;
+    defs.forEach(function (def) {
+        try {
+            var match = /^(([^=]+)=(.+)|@(.*))$/.exec(def);
+            if (match) {
+                if (!match[4]) {
+                    var val = JSON.parse(match[3]);
+                    setProperty(settings, match[2], val);
+                }
+                else {
+                    var obj = fs.readJsonSync(match[4]);
+                    Object.entries(obj).forEach(([key, val]) => {
+                        settings[key] = val;
+                    });
+                }
+            }
+            else {
+                throw new Error("Unexpected option: "+def);
+            }
+        }
+        catch (e) {
+            console.log(e);
+        }
+    });
+}
+
 if (parsedArgs.verbose) {
     settings.verbose = true;
 }