void (Project project, final VirtualFile baseDir, final VirtualFile root, final boolean unique) { final Module[] modules = ModuleManager.getInstance(project).getModules(); if (modules.length > 0 && root != null) { ApplicationManager.getApplication().runWriteAction(() -> { final ModifiableRootModel model = ModuleRootManager.getInstance(modules[0]).getModifiableModel(); final ContentEntry[] contentEntries = model.getContentEntries(); for (ContentEntry contentEntry : contentEntries) { if (Comparing.equal(contentEntry.getFile(), baseDir)) { final SourceFolder[] sourceFolders = contentEntry.getSourceFolders(); if (!unique || sourceFolders.length == 0) { contentEntry.addSourceFolder(root, false); } } } model.commit(); }); } }