Fix macOS client/server failing to start from terminal

The macOS client and server were completely unusable when run from a
terminal. They blocked forever in `[NSApp run];` which was called by
Sys_InitProtocolHandler(). `applicationDidFinishLaunching` was never
called to exit the NSApp run loop.

Use SDL's SDL_DROPFILE event to receive URLs to handle on macOS instead.
This also handles URLs while the game is running (connect to new server)
instead of nothing happening when clicking a link while the game is
running.

code/sdl/sdl_input.c

@@ -1168,6 +1168,28 @@ static void IN_ProcessEvents( void )
 				}
 				break;
 
+#if defined(PROTOCOL_HANDLER) && defined(__APPLE__)
+			case SDL_DROPFILE:
+				{
+					char *filename = e.drop.file;
+
+					// Handle macOS open URL event. URL protocol scheme must be set in Info.plist.
+					if( !Q_strncmp( filename, PROTOCOL_HANDLER ":", strlen( PROTOCOL_HANDLER ":" ) ) )
+					{
+						char *protocolCommand = Sys_ParseProtocolUri( filename );
+
+						if( protocolCommand )
+						{
+							Cbuf_ExecuteText( EXEC_APPEND, va( "%s\n", protocolCommand ) );
+							free( protocolCommand );
+						}
+					}
+
+					SDL_free( filename );
+				}
+				break;
+#endif
+
 			default:
 				break;
 		}
@@ -1250,6 +1272,10 @@ void IN_Init( void *windowData )
 	in_joystick = Cvar_Get( "in_joystick", "0", CVAR_ARCHIVE|CVAR_LATCH );
 	in_joystickThreshold = Cvar_Get( "joy_threshold", "0.15", CVAR_ARCHIVE );
 
+#if defined(PROTOCOL_HANDLER) && defined(__APPLE__)
+	SDL_EventState( SDL_DROPFILE, SDL_ENABLE );
+#endif
+
 	SDL_StartTextInput( );
 
 	mouseAvailable = ( in_mouse->value != 0 );

code/sys/sys_local.h

@@ -66,6 +66,5 @@ int Sys_PID( void );
 qboolean Sys_PIDIsRunning( int pid );
 
 #ifdef PROTOCOL_HANDLER
-char *Sys_InitProtocolHandler( void );
 char *Sys_ParseProtocolUri( const char *uri );
 #endif

code/sys/sys_main.c

@@ -643,20 +643,6 @@ void Sys_ParseArgs( int argc, char **argv )
 }
 
 #ifdef PROTOCOL_HANDLER
-/*
-=================
-Sys_InitProtocolHandler
-
-See sys_osx.m for macOS implementation.
-=================
-*/
-#ifndef __APPLE__
-char *Sys_InitProtocolHandler( void )
-{
-	return NULL;
-}
-#endif
-
 /*
 =================
 Sys_ParseProtocolUri
@@ -716,9 +702,9 @@ char *Sys_ParseProtocolUri( const char *uri )
 			}
 		}
 
-		bufsize = strlen( "+connect " ) + i + 1;
+		bufsize = strlen( "connect " ) + i + 1;
 		out = malloc( bufsize );
-		strcpy( out, "+connect " );
+		strcpy( out, "connect " );
 		strncat( out, uri, i );
 		return out;
 	}
@@ -815,10 +801,6 @@ int main( int argc, char **argv )
 
 	Sys_PlatformInit( );
 
-#ifdef PROTOCOL_HANDLER
-	protocolCommand = Sys_InitProtocolHandler( );
-#endif
-
 	// Set the initial time base
 	Sys_Milliseconds( );
 
@@ -865,6 +847,7 @@ int main( int argc, char **argv )
 #ifdef PROTOCOL_HANDLER
 	if ( protocolCommand != NULL )
 	{
+		Q_strcat( commandLine, sizeof( commandLine ), "+" );
 		Q_strcat( commandLine, sizeof( commandLine ), protocolCommand );
 		free( protocolCommand );
 	}

code/sys/sys_osx.m

@@ -34,10 +34,6 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #import <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
-#ifdef PROTOCOL_HANDLER
-char *protocolCommand = NULL;
-#endif
-
 /*
 ==============
 Sys_Dialog
@@ -119,42 +115,3 @@ char *Sys_StripAppBundle( char *dir )
 	Q_strncpyz(cwd, Sys_Dirname(cwd), sizeof(cwd));
 	return cwd;
 }
-
-#ifdef PROTOCOL_HANDLER
-
-@interface AppDelegate : NSObject <NSApplicationDelegate>
-@end
-
-@implementation AppDelegate
-
-- (void)handleAppleEvent:(NSAppleEventDescriptor *)event withReplyEvent: (NSAppleEventDescriptor *)replyEvent
-{
-	NSString *input = [[event paramDescriptorForKeyword:keyDirectObject] stringValue];
-	protocolCommand = Sys_ParseProtocolUri( input.UTF8String );
-}
-
-- (void)applicationDidFinishLaunching:(NSNotification *)notification
-{
-	[NSApp stop:nil];
-}
-
-@end
-
-char *Sys_InitProtocolHandler( void )
-{
-	[NSApplication sharedApplication];
-
-	AppDelegate *appDelegate = [AppDelegate new];
-	NSAppleEventManager *sharedAppleEventManager = [NSAppleEventManager new];
-	[sharedAppleEventManager setEventHandler:appDelegate
-	                             andSelector:@selector(handleAppleEvent:withReplyEvent:)
-	                           forEventClass:kInternetEventClass
-	                              andEventID:kAEGetURL];
-
-	[NSApp setDelegate:appDelegate];
-	[NSApp run];
-
-	return protocolCommand;
-}
-
-#endif