SCUMM: Add a "chained games manager"

This replaces the somewhat ugly use of the config manager to store
the chained games.

3 files changed, 61 insertions, 1 deletions

diff --git a/engines/engine.cpp b/engines/engine.cpp
index c63437f800..24008dd073 100644
--- a/engines/engine.cpp
+++ b/engines/engine.cpp
@@ -45,6 +45,7 @@
 #include "common/taskbar.h"
 #include "common/textconsole.h"
 #include "common/translation.h"
+#include "common/singleton.h"
 
 #include "backends/keymapper/keymapper.h"
 
@@ -101,6 +102,36 @@ static void defaultErrorHandler(const char *msg) {
 	}
 }
 
+// Chained games manager
+
+ChainedGamesManager::ChainedGamesManager() {
+	clear();
+}
+
+void ChainedGamesManager::clear() {
+	_chainedGames.clear();
+}
+
+void ChainedGamesManager::push(const Common::String target, const int slot) {
+	Game game;
+	game.target = target;
+	game.slot = slot;
+	_chainedGames.push(game);
+}
+
+bool ChainedGamesManager::pop(Common::String &target, int &slot) {
+	if (_chainedGames.empty()) {
+		return false;
+	}
+	Game game = _chainedGames.pop();
+	target = game.target;
+	slot = game.slot;
+	return true;
+}
+
+namespace Common {
+DECLARE_SINGLETON(ChainedGamesManager);
+}
 
 Engine::Engine(OSystem *syst)
 	: _system(syst),
diff --git a/engines/engine.h b/engines/engine.h
index e325cc1ba2..d3415d584c 100644
--- a/engines/engine.h
+++ b/engines/engine.h
@@ -27,6 +27,8 @@
 #include "common/str.h"
 #include "common/language.h"
 #include "common/platform.h"
+#include "common/queue.h"
+#include "common/singleton.h"
 
 class OSystem;
 
@@ -334,6 +336,32 @@ protected:
 
 };
 
+// Chained games
+
+/**
+ * Singleton class which manages chained games. A chained game is one that
+ * starts automatically, optionally loading a saved game, instead of returning
+ * to the launcher.
+ */
+class ChainedGamesManager : public Common::Singleton<ChainedGamesManager> {
+private:
+	struct Game {
+		Common::String target;
+		int slot;
+	};
+
+	Common::Queue<Game> _chainedGames;
+
+public:
+	ChainedGamesManager();
+	void clear();
+	void push(const Common::String target, const int slot = -1);
+	bool pop(Common::String &target, int &slot);
+};
+
+/** Convenience shortcut for accessing the chained games manager. */
+#define ChainedGamesMan ChainedGamesManager::instance()
+
 // FIXME: HACK for MidiEmu & error()
 extern Engine *g_engine;
 
diff --git a/engines/scumm/scumm.cpp b/engines/scumm/scumm.cpp
index 34ae957951..9518ed4e5c 100644
--- a/engines/scumm/scumm.cpp
+++ b/engines/scumm/scumm.cpp
@@ -2625,7 +2625,8 @@ bool ScummEngine::startManiac() {
 
 		// Set up the chanined games to Maniac Mansion, and then back
 		// to the current game again with that save slot.
-		ConfMan.set("chained_games", maniacTarget + "," + ConfMan.getActiveDomainName() + ":100", Common::ConfigManager::kTransientDomain);
+		ChainedGamesMan.push(maniacTarget);
+		ChainedGamesMan.push(ConfMan.getActiveDomainName(), 100);
 
 		// Force a return to the launcher. This will start the first
 		// chained game.