BASE: Add --auto-detect command

Allows to display games in the current directory that are compatible with ScummVM.

This option enables the user to find games in the directory from which ScummVM was launched. In terminal it looks like:

--------------------------------------------------------------------------------------

$ scummvm --auto-detect

ID                   Description
-------------------- ---------------------------------------------------------
drascula             Drascula: The Vampire Strikes Back (DOS/English)
queen                Flight of the Amazon Queen (Talkie/DOS/English)

--------------------------------------------------------------------------------------

The current directory is defined as dir(".") then using EngineMan.detectGames to recognise games.

1 files changed, 25 insertions, 0 deletions

diff --git a/base/commandLine.cpp b/base/commandLine.cpp
index 558c147b96..57a5893db0 100644
--- a/base/commandLine.cpp
+++ b/base/commandLine.cpp
@@ -68,6 +68,7 @@ static const char HELP_STRING[] =
 	"  -z, --list-games         Display list of supported games and exit\n"
 	"  -t, --list-targets       Display list of configured targets and exit\n"
 	"  --list-saves=TARGET      Display a list of saved games for the game (TARGET) specified\n"
+	"  --auto-detect            Display a list of games from current directory\n"
 #if defined(WIN32) && !defined(_WIN32_WCE) && !defined(__SYMBIAN32__)
 	"  --console                Enable the console window (default:enabled)\n"
 #endif
@@ -402,6 +403,9 @@ Common::String parseCommandLine(Common::StringMap &settings, int argc, const cha
 			DO_COMMAND('z', "list-games")
 			END_COMMAND
 
+			DO_LONG_COMMAND("auto-detect")
+			END_COMMAND
+
 #ifdef DETECTOR_TESTING_HACK
 			// HACK FIXME TODO: This command is intentionally *not* documented!
 			DO_LONG_COMMAND("test-detector")
@@ -771,6 +775,24 @@ static void listAudioDevices() {
 	}
 }
 
+/** Display all games in current directory */
+static void autoDetect(){
+	//Current directory
+	Common::FSNode dir(".");
+	Common::FSList files;
+	//Collect all files from directory
+	dir.getChildren(files, Common::FSNode::kListAll);
+	GameList candidates(EngineMan.detectGames(files));
+	if (candidates.empty()) {
+		printf("%s\n","ScummVM could not find any game in the current directory" );
+	} else {
+		printf("ID                   Description\n");
+		printf("-------------------- ---------------------------------------------------------\n");
+		for (GameList::iterator v = candidates.begin(); v != candidates.end(); ++v) {
+			printf("%-20s %s\n", v->gameid().c_str(), v->description().c_str());
+		}
+	}
+}
 
 #ifdef DETECTOR_TESTING_HACK
 static void runDetectorTest() {
@@ -997,6 +1019,9 @@ bool processSettings(Common::String &command, Common::StringMap &settings, Commo
 	} else if (command == "help") {
 		printf(HELP_STRING, s_appName);
 		return true;
+	} else if (command == "auto-detect"){
+		autoDetect();
+		return true;
 	}
 #ifdef DETECTOR_TESTING_HACK
 	else if (command == "test-detector") {