[runmode.node addon] Include null mode

addon/runmode/runmode.node.js

@@ -68,6 +68,12 @@ exports.defineMode = function(name, mode) {
   modes[name] = mode;
 };
 exports.defineMIME = function(mime, spec) { mimeModes[mime] = spec; };
+
+exports.defineMode("null", function() {
+  return {token: function(stream) {stream.skipToEnd();}};
+});
+exports.defineMIME("text/plain", "null");
+
 exports.getMode = function(options, spec) {
   if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
     spec = mimeModes[spec];

bin/source-highlight

@@ -27,7 +27,7 @@ CodeMirror.modeInfo.forEach(function(info) {
 });
 
 function ensureMode(name) {
-  if (CodeMirror.modes[name]) return;
+  if (CodeMirror.modes[name] || name == "null") return;
   try {
     require("../mode/" + name + "/" + name + ".js");
   } catch(e) {