* Change -v to --vm and document its usage.

README.mkdn

@@ -1,5 +1,8 @@
 # EtherCalc
 
+* Introduction:
+    * English: https://gist.github.com/3978463
+    * 中文版: https://gist.github.com/3985324
 * Language: [LiveScript](http://livescript.net/)
 * Runtime: [Node.js](http://nodejs.org/) (0.8+ preferred; compatible with 0.4)
 * Services: [Redis](http://redis.io) (2.4+; fall-back to on-disk JSON storage if not present)
@@ -60,6 +63,12 @@ Useful when running under an URL rewriter.
 
 Offers read-write vs. read-only modes. See issues [#1](https://github.com/audreyt/ethercalc/issues/1) and [#4](https://github.com/audreyt/ethercalc/issues/4) for details on setting this up.
 
+### Disable server-side WebWorkers: `--vm`
+
+Runs a single-thread background loop with `vm.createContext` instead of `webworker-threads`.
+
+Useful for running custom functions in server side that requires full VM access.
+
 # Licensing
 
 ### Common Public Attribution License (Socialtext Inc.)

app.js

@@ -15,7 +15,7 @@ This work is published from Taiwan.
   };
   argv = (function(){
     try {
-      return require('optimist').argv;
+      return require('optimist').boolean(['vm', 'polling']).argv;
     } catch (e$) {}
   }()) || {};
   json = (function(){

sc.js

@@ -1,23 +1,26 @@
 (function(){
-  var vm, fs, path, bootSC, Worker, e, wt;
+  var vm, fs, path, bootSC, argv, Worker, e;
   vm = require('vm');
   fs = require('fs');
-  argv = require('optimist').argv;
   path = require('path');
   bootSC = fs.readFileSync(path.dirname(fs.realpathSync(__filename)) + "/SocialCalcModule.js", 'utf8');
   global.SC == null && (global.SC = {});
+  argv = (function(){
+    try {
+      return require('optimist').boolean(['vm', 'polling']).argv;
+    } catch (e$) {}
+  }()) || {};
+  console.log(argv);
   Worker = (function(){
     try {
-      wt = require('webworker-threads').Worker;
-    } catch (e$) {
-	wt=null;
+      if (argv.vm) {
+        throw 'vm';
       }
-    if (wt!=null && argv.v != true) {
-      console.log("starting backend using webworker-threads");
-      return wt;
-    } else {
-      //e = e$;
-      console.log("starting backend using vm.CreateContext");
+      console.log("Starting backend using webworker-threads");
+      return require('webworker-threads').Worker;
+    } catch (e$) {
+      e = e$;
+      console.log("Falling back to vm.CreateContext backend");
       return (function(){
         var prototype = constructor.prototype;
         function constructor(code){

src/app.ls

@@ -10,7 +10,7 @@ This work is published from Taiwan.
 */
 
 slurp = -> require \fs .readFileSync it, \utf8
-argv = (try require \optimist .argv) || {}
+argv = (try require \optimist .boolean <[ vm polling ]> .argv) || {}
 json = try JSON.parse slurp \/home/dotcloud/environment.json
 port = Number(argv.port or json?PORT_NODEJS or process.env.PORT or process.env.VCAP_APP_PORT or process.env.OPENSHIFT_INTERNAL_PORT) or 8000
 host = argv.host or process.env.VCAP_APP_HOST or process.env.OPENSHIFT_INTERNAL_IP or \0.0.0.0

src/sc.ls

@@ -5,13 +5,17 @@ bootSC = fs.readFileSync "#{
     path.dirname fs.realpathSync __filename
 }/SocialCalcModule.js" \utf8
 global.SC ?= {}
+argv = (try require \optimist .boolean <[ vm polling ]> .argv) || {}
+console.log argv
 
 ##################################
 ### WebWorker Threads Fallback ###
 ##################################
 Worker = try
+  throw \vm if argv.vm
+  console.log "Starting backend using webworker-threads"
   (require \webworker-threads).Worker
-catch => class => (code) ->
+catch => console.log "Falling back to vm.CreateContext backend"; class => (code) ->
   vm = require \vm
   cxt = { console, self: { onmessage: -> } }
   cxt.window =