Export more functions for initializing and starting node.

For greater flexibility in controlling node's initialization and startup, the
following new functions are exported.

  - node::Init()
  - node::SetupProcessObject()
  - node::Load()
  - node::EmitExit()

These are some of the major steps involved in node::Setup().  Exporting these
functions allows an embedding program to write a replacement for node::Start(),
and to have access to the node process object after it's created.

src/node.cc

@@ -1933,7 +1933,7 @@ static Handle<Array> EnvEnumerator(const AccessorInfo& info) {
 }
 
 
-static void Load(int argc, char *argv[]) {
+Handle<Object> SetupProcessObject(int argc, char *argv[]) {
   HandleScope scope;
 
   int i, j;
@@ -2064,12 +2064,31 @@ static void Load(int argc, char *argv[]) {
   process->Set(String::NewSymbol("EventEmitter"),
                EventEmitter::constructor_template->GetFunction());
 
+  return process;
+}
+
+
+static void AtExit() {
+  node::Stdio::Flush();
+  node::Stdio::DisableRawMode(STDIN_FILENO);
+}
+
+
+static void SignalExit(int signal) {
+  Stdio::DisableRawMode(STDIN_FILENO);
+  _exit(1);
+}
+
+
+void Load(Handle<Object> process) {
   // Compile, execute the src/node.js file. (Which was included as static C
   // string in node_natives.h. 'natve_node' is the string containing that
   // source code.)
 
   // The node.js file returns a function 'f'
 
+  atexit(AtExit);
+
   TryCatch try_catch;
 
   Local<Value> f_value = ExecuteString(MainSource(),
@@ -2156,11 +2175,11 @@ static void PrintHelp() {
 }
 
 // Parse node command line arguments.
-static void ParseArgs(int *argc, char **argv) {
+static void ParseArgs(int argc, char **argv) {
   int i;
 
   // TODO use parse opts
-  for (i = 1; i < *argc; i++) {
+  for (i = 1; i < argc; i++) {
     const char *arg = argv[i];
     if (strstr(arg, "--debug") == arg) {
       ParseDebugOpt(arg);
@@ -2181,7 +2200,7 @@ static void ParseArgs(int *argc, char **argv) {
       PrintHelp();
       exit(0);
     } else if (strcmp(arg, "--eval") == 0 || strcmp(arg, "-e") == 0) {
-      if (*argc <= i + 1) {
+      if (argc <= i + 1) {
         fprintf(stderr, "Error: --eval requires an argument\n");
         exit(1);
       }
@@ -2198,18 +2217,6 @@ static void ParseArgs(int *argc, char **argv) {
 }
 
 
-static void AtExit() {
-  node::Stdio::Flush();
-  node::Stdio::DisableRawMode(STDIN_FILENO);
-}
-
-
-static void SignalExit(int signal) {
-  Stdio::DisableRawMode(STDIN_FILENO);
-  _exit(1);
-}
-
-
 static void EnableDebug(bool wait_connect) {
   // Start the debug thread and it's associated TCP server on port 5858.
   bool r = Debug::EnableAgent("node " NODE_VERSION, debug_port);
@@ -2262,12 +2269,12 @@ static int RegisterSignalHandler(int signal, void (*handler)(int)) {
 #endif // __POSIX__
 
 
-int Start(int argc, char *argv[]) {
+char** Init(int argc, char *argv[]) {
   // Hack aroung with the argv pointer. Used for process.title = "blah".
   argv = node::Platform::SetupArgs(argc, argv);
 
   // Parse a few arguments which are specific to Node.
-  node::ParseArgs(&argc, argv);
+  node::ParseArgs(argc, argv);
   // Parse the rest of the args (up to the 'option_end_index' (where '--' was
   // in the command line))
   int v8argc = node::option_end_index;
@@ -2354,9 +2361,6 @@ int Start(int argc, char *argv[]) {
     eio_set_max_poll_reqs(10);
   }
 
-  V8::Initialize();
-  HandleScope handle_scope;
-
   V8::SetFatalErrorHandler(node::OnFatalError);
 
 
@@ -2386,15 +2390,39 @@ int Start(int argc, char *argv[]) {
 #endif // __POSIX__
   }
 
+  return argv;
+}
+
+
+void EmitExit(v8::Handle<v8::Object> process) {
+  // process.emit('exit')
+  Local<Value> emit_v = process->Get(String::New("emit"));
+  assert(emit_v->IsFunction());
+  Local<Function> emit = Local<Function>::Cast(emit_v);
+  Local<Value> args[] = { String::New("exit") };
+  TryCatch try_catch;
+  emit->Call(process, 1, args);
+  if (try_catch.HasCaught()) {
+    FatalException(try_catch);
+  }
+}
+
+
+int Start(int argc, char *argv[]) {
+  v8::V8::Initialize();
+  v8::HandleScope handle_scope;
+
+  argv = Init(argc, argv);
+
   // Create the one and only Context.
   Persistent<v8::Context> context = v8::Context::New();
   v8::Context::Scope context_scope(context);
 
-  atexit(node::AtExit);
+  Handle<Object> process = SetupProcessObject(argc, argv);
 
   // Create all the objects, load modules, do everything.
   // so your next reading stop should be node::Load()!
-  node::Load(argc, argv);
+  Load(process);
 
   // TODO Probably don't need to start this each time.
   // Avoids failing on test/simple/test-eio-race3.js though
@@ -2407,18 +2435,7 @@ int Start(int argc, char *argv[]) {
   // watchers, it blocks.
   ev_loop(EV_DEFAULT_UC_ 0);
 
-
-  // process.emit('exit')
-  Local<Value> emit_v = process->Get(String::New("emit"));
-  assert(emit_v->IsFunction());
-  Local<Function> emit = Local<Function>::Cast(emit_v);
-  Local<Value> args[] = { String::New("exit") };
-  TryCatch try_catch;
-  emit->Call(process, 1, args);
-  if (try_catch.HasCaught()) {
-    FatalException(try_catch);
-  }
-
+  EmitExit(process);
 
 #ifndef NDEBUG
   // Clean up.

src/node.h

@@ -37,7 +37,12 @@
 
 namespace node {
 
-int Start (int argc, char *argv[]);
+int Start(int argc, char *argv[]);
+
+char** Init(int argc, char *argv[]);
+v8::Handle<v8::Object> SetupProcessObject(int argc, char *argv[]);
+void Load(v8::Handle<v8::Object> process);
+void EmitExit(v8::Handle<v8::Object> process);
 
 #define NODE_PSYMBOL(s) Persistent<String>::New(String::NewSymbol(s))