COMMON: Cleanup names/handling of some error codes

base/commandLine.cpp

@@ -641,30 +641,31 @@ static Common::Error listSaves(const char *target) {
 	GameDescriptor game = EngineMan.findGame(gameid, &plugin);
 
 	if (!plugin) {
-		warning("Could not find any plugin to handle target '%s' (gameid '%s')", target, gameid.c_str());
-		return Common::kPluginNotFound;
+		return Common::Error(Common::kEnginePluginNotFound,
+						Common::String::format("target '%s', gameid '%s", target, gameid.c_str()));
 	}
 
 	if (!(*plugin)->hasFeature(MetaEngine::kSupportsListSaves)) {
 		// TODO: Include more info about the target (desc, engine name, ...) ???
-		printf("ScummVM does not support listing save states for target '%s' (gameid '%s') .\n", target, gameid.c_str());
-		result = Common::kPluginNotSupportSaves;
+		return Common::Error(Common::kEnginePluginNotSupportSaves,
+						Common::String::format("target '%s', gameid '%s", target, gameid.c_str()));
 	} else {
 		// Query the plugin for a list of savegames
 		SaveStateList saveList = (*plugin)->listSaves(target);
 
+		if (saveList.size() > 0) {
 			// TODO: Include more info about the target (desc, engine name, ...) ???
-		printf("Saves for target '%s' (gameid '%s'):\n", target, gameid.c_str());
+			printf("Save states for target '%s' (gameid '%s'):\n", target, gameid.c_str());
 			printf("  Slot Description                                           \n"
 				   "  ---- ------------------------------------------------------\n");
 
-		if (saveList.size() == 0)
-			result = Common::kNoSavesError;
-
 			for (SaveStateList::const_iterator x = saveList.begin(); x != saveList.end(); ++x) {
 				printf("  %-4s %s\n", x->save_slot().c_str(), x->description().c_str());
 				// TODO: Could also iterate over the full hashmap, printing all key-value pairs
 			}
+		} else {
+			printf("There are no save states for target '%s' (gameid '%s'):\n", target, gameid.c_str());
+		}
 	}
 
 	// Revert to the old active domain

base/main.cpp

@@ -111,13 +111,12 @@ static const EnginePlugin *detectPlugin() {
 	if (plugin == 0) {
 		printf("failed\n");
 		warning("%s is an invalid gameid. Use the --list-games option to list supported gameid", gameid.c_str());
-		return 0;
 	} else {
 		printf("%s\n", plugin->getName());
-	}
 
 		// FIXME: Do we really need this one?
 		printf("  Starting '%s'\n", game.description().c_str());
+	}
 
 	return plugin;
 }
@@ -352,8 +351,10 @@ extern "C" int scummvm_main(int argc, const char * const argv[]) {
 
 	// TODO: deal with settings that require plugins to be loaded
 	res = Base::processSettings(command, settings);
-	if (res.getCode() != Common::kArgumentNotProcessed)
+	if (res.getCode() != Common::kArgumentNotProcessed) {
+		warning("%s", res.getDesc().c_str());
 		return res.getCode();
+	}
 
 	// Init the backend. Must take place after all config data (including
 	// the command line params) was read.

common/error.cpp

@@ -66,11 +66,15 @@ static String errorToString(ErrorCode errorCode) {
 	case kWritingFailed:
 		return _s("Writing data failed");
 
-	case kUnknownError:
-	case kPluginNotFound:
-	case kPluginNotSupportSaves:
-	case kNoSavesError:
+	case kEnginePluginNotFound:
+		return _s("Could not find suitable engine plugin");
+	case kEnginePluginNotSupportSaves:
+		return _s("Engine plugin does not support save states");
+
 	case kArgumentNotProcessed:
+		return _s("Command line argument not processed");
+
+	case kUnknownError:
 	default:
 		return _s("Unknown error");
 	}

common/error.h

@@ -63,9 +63,8 @@ enum ErrorCode {
 	kWritingFailed,				///< Failure to write data -- disk full?
 
 	// The following are used by --list-saves
-	kPluginNotFound,			///< Failed to find plugin to handle target
-	kPluginNotSupportSaves,		///< Failed if plugin does not support saves
-	kNoSavesError,				///< There are no saves to show
+	kEnginePluginNotFound,		///< Failed to find plugin to handle target
+	kEnginePluginNotSupportSaves,	///< Failed if plugin does not support listing save states
 
 	kArgumentNotProcessed,		///< Used in command line parsing