Add HideIncompleteCourses; in some environments, it doesn't make sense to show incomplete courses.

stepmania/src/Course.cpp

@@ -219,6 +219,7 @@ void Course::Init()
 	m_SortOrder_Ranking = 0;
 
 	m_LoadedFromProfile = ProfileSlot_Invalid;
+	m_bIncomplete = false;
 	m_TrailCache.clear();
 	m_iTrailCacheSeed = 0;
 	m_RadarCache.clear();

stepmania/src/CourseLoaderCRS.cpp

@@ -185,6 +185,7 @@ bool CourseLoaderCRS::LoadFromMsd( const RString &sPath, const MsdFile &msd, Cou
 				{
 					LOG->UserLog( "Course file", sPath, "random_within_group entry \"%s\" specifies a group that doesn't exist. "
 						      "This entry will be ignored.", sSong.c_str() );
+					out.m_bIncomplete = true;
 					continue; // skip this #SONG
 				}
 			}
@@ -211,6 +212,7 @@ bool CourseLoaderCRS::LoadFromMsd( const RString &sPath, const MsdFile &msd, Cou
 				{
 					LOG->UserLog( "Course file", sPath, "contains a fixed song entry \"%s\" that does not exist. "
 						      "This entry will be ignored.", sSong.c_str());
+					out.m_bIncomplete = true;
 					continue; // skip this #SONG
 				}
 			}

stepmania/src/SongManager.cpp

@@ -53,6 +53,7 @@ static const ThemeMetric<bool>		MOVE_UNLOCKS_TO_BOTTOM_OF_PREFERRED_SORT	( "Song
 static const ThemeMetric<int>		EXTRA_STAGE2_DIFFICULTY_MAX	( "SongManager", "ExtraStage2DifficultyMax" );
 
 static Preference<RString> g_sDisabledSongs( "DisabledSongs", "" );
+static Preference<bool> g_bHideIncompleteCourses( "HideIncompleteCourses", false );
 
 RString SONG_GROUP_COLOR_NAME( size_t i )   { return ssprintf( "SongGroupColor%i", (int) i+1 ); }
 RString COURSE_GROUP_COLOR_NAME( size_t i ) { return ssprintf( "CourseGroupColor%i", (int) i+1 ); }
@@ -705,6 +706,13 @@ void SongManager::InitCoursesFromDisk( LoadingWindow *ld )
 
 			Course* pCourse = new Course;
 			CourseLoaderCRS::LoadFromCRSFile( *sCoursePath, *pCourse );
+
+			if( g_bHideIncompleteCourses.Get() && pCourse->m_bIncomplete )
+			{
+				delete pCourse;
+				continue;
+			}
+
 			m_pCourses.push_back( pCourse );
 		}
 	}