Issue #372 - Added plugin to change display on joystick input

- The frontend now includes the "SpecificDisplay" plugin which can be
configured to show a specific display when particular custom input is
received.
- Exposed the fe.Display and fe.Filters arrays for plugin and layout
access from within the config menu

config/plugins/SpecificDisplay.nut

@@ -0,0 +1,68 @@
+///////////////////////////////////////////////////
+//
+// Attract-Mode Frontend - SpecificDisplay plugin
+//
+///////////////////////////////////////////////////
+class UserConfig </ help="Load a specific display on custom input" /> {
+
+	</ label="Display to Show", help="The display to be shown when input is recieved", order=1, options="" />
+	display="";
+
+	</ label="Trigger",
+		help="The custom command that will show this display (see also: Config->Controls->Costom#)",
+		order=2, options="Custom1,Custom2,Custom3,Custom4,Custom5,Custom6" />
+	trigger="";
+};
+
+local dattr = UserConfig.getattributes("display");
+foreach ( d in fe.displays )
+{
+	if ( dattr["options"].len() < 1 )
+		dattr["options"] = d.name;
+	else
+		dattr["options"] += "," + d.name;
+}
+
+UserConfig.setattributes("display", dattr);
+
+class SpecificDisplay
+{
+	trigger = "";
+	display_index = 0;
+
+	constructor()
+	{
+		local my_config = fe.get_config();
+
+		trigger = my_config["trigger"].tolower();
+
+		for ( local i=0; i<fe.displays.len(); i++ )
+		{
+			if ( fe.displays[i].name == my_config[ "display" ] )
+			{
+				display_index = i;
+				break;
+			}
+		}
+
+		if ( display_index == -1 )
+		{
+			print( "SpecificDisplay plugin: could not find configured display: "
+				+ my_config["display"] + "\n" );
+			display_index = 0;
+		}
+
+		fe.add_signal_handler( this, "on_signal" );
+	}
+
+	function on_signal( signal_str )
+	{
+		if ( signal_str == trigger )
+			fe.set_display( display_index );
+
+		return false;
+	}
+}
+
+fe.plugin[ "SpecificDisplay" ] <- SpecificDisplay();
+

src/fe_vm.cpp

@@ -1431,12 +1431,57 @@ class FeConfigVM
 
 			fe.SetInstance( _SC("overlay"), fe_vm );
 
+			fe.Bind( _SC("Display"), Sqrat::Class <FeDisplayInfo, Sqrat::NoConstructor>()
+				.Prop( _SC("name"), &FeDisplayInfo::get_name )
+				.Prop( _SC("layout"), &FeDisplayInfo::get_layout )
+				.Prop( _SC("romlist"), &FeDisplayInfo::get_romlist_name )
+				.Prop( _SC("in_cycle"), &FeDisplayInfo::show_in_cycle )
+				.Prop( _SC("in_menu"), &FeDisplayInfo::show_in_menu )
+			);
+
+			fe.Bind( _SC("Filter"), Sqrat::Class <FeFilter, Sqrat::NoConstructor>()
+				.Prop( _SC("name"), &FeFilter::get_name )
+				.Prop( _SC("index"), &FeFilter::get_rom_index )
+				.Prop( _SC("size"), &FeFilter::get_size )
+				.Prop( _SC("sort_by"), &FeFilter::get_sort_by )
+				.Prop( _SC("reverse_order"), &FeFilter::get_reverse_order )
+				.Prop( _SC("list_limit"), &FeFilter::get_list_limit )
+			);
+
 			fe.Bind( _SC("Monitor"), Sqrat::Class <FeMonitor, Sqrat::NoConstructor>()
 				.Prop( _SC("num"), &FeMonitor::get_num )
 				.Prop( _SC("width"), &FeMonitor::get_width )
 				.Prop( _SC("height"), &FeMonitor::get_height )
 			);
 
+			//
+			// fe.displays
+			//
+			Sqrat::Table dtab;  // hack Table to Array because creating the Array straight up doesn't work
+			fe.Bind( _SC("displays"), dtab );
+			Sqrat::Array darray( dtab.GetObject() );
+
+			int display_count = fe_vm->m_feSettings->displays_count();
+			for ( int i=0; i< display_count; i++ )
+				darray.SetInstance( darray.GetSize(),
+					fe_vm->m_feSettings->get_display( i ) );
+
+			//
+			// fe.filters
+			//
+			FeDisplayInfo *di = fe_vm->m_feSettings->get_display(
+				fe_vm->m_feSettings->get_current_display_index() );
+
+			Sqrat::Table ftab;  // hack Table to Array because creating the Array straight up doesn't work
+			fe.Bind( _SC("filters"), ftab );
+			Sqrat::Array farray( ftab.GetObject() );
+
+			if ( di )
+			{
+				for ( int i=0; i < di->get_filter_count(); i++ )
+					farray.SetInstance( farray.GetSize(), di->get_filter( i ) );
+			}
+
 			// hack Table to Array because creating the Array straight up doesn't work
 			Sqrat::Table mtab;
 			fe.Bind( _SC("monitors"), mtab );