Add options to process.watchFile()

doc/api.txt

@@ -124,9 +124,14 @@ Send a signal to a process. +pid+ is the process id and +signal+ is the
 signal to send; for example, "SIGINT" or "SIGUSR1".  See kill(2) for more
 information.
 
-+process.watchFile(filename, listener)+::
++process.watchFile(filename, [options,] listener)+::
 Watch for changes on +filename+. The callback +listener+ will be called each
 time the file changes.
++
+The second argument is optional. The +options+ if provided should be an
+object containing two members a boolean, +persistent+, and +interval+, a
+polling value in milliseconds. The default is +{persistent: true, interval:
+0}+.
 
 +process.unwatchFile(filename)+::
 Stop watching for changes on +filename+.

src/node.js

@@ -336,14 +336,29 @@ process.addListener("newListener", function (event) {
 
 var statWatchers = {};
 
-process.watchFile = function (filename, listener) {
+process.watchFile = function (filename) {
   var stat;
+  var options;
+  var listener;
+
+  if ("object" == typeof arguments[1]) {
+    options = arguments[1];
+    listener = arguments[2];
+  } else {
+    options = {};
+    listener = arguments[1];
+  }
+
+  if (options.persistent === undefined) options.persistent = true;
+  if (options.interval === undefined) options.persistent = 0;
+
+
   if (filename in statWatchers) {
     stat = statWatchers[filename];
   } else {
     statWatchers[filename] = new process.Stat();
     stat = statWatchers[filename];
-    stat.start(filename, true);
+    stat.start(filename, options.persistent, options.interval);
   }
   stat.addListener("change", listener);
   return stat;

src/node_stat.cc

@@ -57,7 +57,12 @@ Handle<Value> Stat::Start(const Arguments& args) {
   assert(handler->path_ == NULL);
   handler->path_ = strdup(*path);
 
-  ev_stat_set(&handler->watcher_, handler->path_, 0.);
+  ev_tstamp interval = 0.;
+  if (args[2]->IsInt32()) {
+    interval = NODE_V8_UNIXTIME(args[2]);
+  }
+
+  ev_stat_set(&handler->watcher_, handler->path_, interval);
   ev_stat_start(EV_DEFAULT_UC_ &handler->watcher_);
 
   handler->persistent_ = args[1]->IsTrue();