various arch modifications, mainly for file download support

src/archutils/Darwin/SMMain.mm

@@ -1,6 +1,8 @@
 #include "global.h"
 #include "RageUtil.h"
 #include "RageThreads.h"
+#include "RageLog.h"
+#include "CommandLineActions.h"
 
 #import <Cocoa/Cocoa.h>
 #include "ProductInfo.h"
@@ -69,11 +71,34 @@
 	exit( SM_main(m_iArgc, m_pArgv) );
 }
 
+/* From here:
+ * http://www.cocoadev.com/index.pl?HowToRegisterURLHandler */
+- (void) getUrl:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent
+{
+	const char *url = [[[event paramDescriptorForKeyword:keyDirectObject] stringValue] UTF8String];
+
+	LOG->Info("Parsing URL: %s", url);
+
+	// I'm not sure this handles everything it needs to. - Colby
+	CommandLineActions::CommandLineArgs args;
+	args.argv.push_back(url);
+
+	CommandLineActions::ToProcess.push_back(args);
+}
+
 // Called when the internal event loop has just started running.
 - (void) applicationDidFinishLaunching:(NSNotification *)note
 {
 	m_bApplicationLaunched = YES;
 	[NSThread detachNewThreadSelector:@selector(startGame:) toTarget:self withObject:nil];
+
+	// Register ourselves as a URL handler.
+	[
+		[NSAppleEventManager sharedAppleEventManager] setEventHandler:self
+		andSelector:@selector(getUrl:withReplyEvent:)
+		forEventClass:kInternetEventClass
+		andEventID:kAEGetURL
+	];
 }
 
 - (BOOL) application:(NSApplication *)app openFile:(NSString *)file