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An interactive shell for accessing Apache Accumulo via a command line interface.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *   https://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.
 */
package org.apache.accumulo.shell.commands;

import java.io.IOException;
import java.util.Iterator;

import org.apache.accumulo.shell.Shell;
import org.apache.accumulo.shell.Shell.Command;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.jline.reader.History;

import com.google.common.collect.Iterators;

public class HistoryCommand extends Command {
  private Option clearHist;
  private Option disablePaginationOpt;

  @Override
  public int execute(final String fullCommand, final CommandLine cl, final Shell shellState)
      throws IOException {
    if (cl.hasOption(clearHist.getOpt())) {
      shellState.getReader().getHistory().purge();
    } else {
      Iterator source = shellState.getReader().getHistory().iterator();
      Iterator historyIterator = Iterators.transform(source,
          input -> String.format("%d: %s", input.index() + 1, input.line()));
      shellState.printLines(historyIterator, !cl.hasOption(disablePaginationOpt.getOpt()));
    }

    return 0;
  }

  @Override
  public String description() {
    return "generates a list of commands previously executed";
  }

  @Override
  public int numArgs() {
    return 0;
  }

  @Override
  public Options getOptions() {
    final Options o = new Options();
    clearHist = new Option("c", "clear", false, "clear history file");
    o.addOption(clearHist);
    disablePaginationOpt = new Option("np", "no-pagination", false, "disable pagination of output");
    o.addOption(disablePaginationOpt);
    return o;
  }
}