public class CustomProjectManager extends ProjectManager {
	
	IProjectConfig projectConfig;
	
	@Override
	public void initialize(ProjectDescription description, IProjectConfig projectConfig,
			Procedure2<? super URI, ? super Iterable<Issue>> acceptor,
			IExternalContentProvider openedDocumentsContentProvider,
			Provider<Map<String, ResourceDescriptionsData>> indexProvider, CancelIndicator cancelIndicator) {
		super.initialize(description, projectConfig, acceptor, openedDocumentsContentProvider, indexProvider, cancelIndicator);
		this.projectConfig = projectConfig;
	}
	
	@Override
	public Result doInitialBuild(CancelIndicator cancelIndicator) {
		List<URI> allUris = new ArrayList<>();
		for (ISourceFolder srcFolder : super.getProjectConfig().getSourceFolders()) {
			allUris.addAll(srcFolder.getAllResources(fileSystemScanner));
		}
		var url = getClass().getResource("/org/eclipse/mydsl/lib/catalogue.mydsl");
		allUris.add(URI.createURI(url.toString()));
		return super.doBuild(allUris, Collections.emptyList(), Collections.emptyList(), cancelIndicator);
	}
}