content: package ganymede.kernel.magic;
  /*-
   * ##########################################################################
   * Ganymede
   * %%
   * Copyright (C) 2021, 2022 Allen D. Ball
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * ##########################################################################
   */
  import com.fasterxml.jackson.databind.JsonNode;
  import ball.annotation.ServiceProviderFor;
  import ganymede.kernel.client.KernelRestClient;
  import ganymede.kernel.renderer.ThymeleafRenderer;
  import ganymede.notebook.AbstractMagic;
  import ganymede.notebook.Description;
  import ganymede.notebook.Magic;
  import ganymede.server.Message;
  import java.util.Map;
  import lombok.Data;
  import lombok.NoArgsConstructor;
  import lombok.ToString;
  import lombok.extern.log4j.Log4j2;
  
  import static java.util.stream.Collectors.toList;
  
  /**
   * {@link Magics} {@link Magic}: List configured {@link Magic}s.
   *
   * @author {@link.uri mailto:ball@hcf.dev Allen D. Ball}
   */
  @ServiceProviderFor({ Magic.class })
  @Description("Lists available cell magics")
  @NoArgsConstructor @ToString @Log4j2
  public class Magics extends AbstractMagic {
      @Override
      public void execute(String line0, String code, JsonNode metadata) throws Exception {
          var resource = getClass().getSimpleName();
          var rows =
              context.magics().values().stream()
              .distinct()
              .map(t -> new Row(String.join(", ", t.getMagicNames()), t.getDescription(), t.getUsage()))
              .collect(toList());
          var map = Map.<String,Object>of("rows", rows);
          var html = ThymeleafRenderer.process(getClass(), resource + ".html", "html", map);
          var text = ThymeleafRenderer.process(getClass(), resource + ".text", "text", map);
  
          new KernelRestClient().print(Message.mime_bundle(html, text));
      }
  
      @Data
      private class Row {
          private final String names;
          private final String description;
          private final String usage;
      }
  }
  