add option to sort object keys

lib/cli.js

@@ -17,6 +17,10 @@ var options = require("nomnom")
         return JSON.parse(fs.readFileSync(__dirname + "/../package.json", "utf8")).version;
       }
     },
+    sort : {
+      string: '-s, --sort-keys',
+      help: 'sort object keys'
+    },
     inplace : {
       string: '-i, --in-place',
       help: 'overwrite the file'
@@ -32,7 +36,10 @@ var options = require("nomnom")
 
 function parse (source) {
   try {
-    return JSON.stringify(parser.parse(source),null,options.indent);
+    var parsed = options.sort ?
+                    sortObject(parser.parse(source)) :
+                    parser.parse(source); 
+    return JSON.stringify(parsed,null,options.indent);
   } catch (e) {
     sys.puts(e);
     process.exit(1);
@@ -47,7 +54,7 @@ function main (args) {
     if (options.inplace) {
       fs.writeSync(fs.openSync(path,'w+'), parse(source), 0, "utf8");
     } else {
-      sys.pupts(parse(source));
+      sys.puts(parse(source));
     }
   } else {
     var stdin = process.openStdin();
@@ -62,4 +69,25 @@ function main (args) {
   }
 }
 
+// from http://stackoverflow.com/questions/1359761/sorting-a-json-object-in-javascript
+function sortObject(o) {
+  if (Object.prototype.toString.call(o) != '[object Object]')
+    return o;
+  var sorted = {},
+  key, a = [];
+
+  for (key in o) {
+    if (o.hasOwnProperty(key)) {
+      a.push(key);
+    }
+  }
+
+  a.sort();
+
+  for (key = 0; key < a.length; key++) {
+    sorted[a[key]] = sortObject(o[a[key]]);
+  }
+  return sorted;
+}
+
 main(process.argv.slice(1));