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TBEL is a powerful expression language for ThingsBoard platform user-defined functions. Original implementation is based on MVEL.

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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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.
 */

package org.mvel2.sh.command.basic;

import org.mvel2.sh.Command;
import org.mvel2.sh.ShellSession;

import static org.mvel2.sh.text.TextUtil.pad;

public class Help implements Command {
  public Object execute(ShellSession session, String[] args) {
    for (String command : session.getCommands().keySet()) {
      System.out.println(command + pad(command.length(), 25) + "- " + session.getCommands().get(command).getDescription());
    }

    return null;
  }


  public String getDescription() {
    return "displays help for available shell commands";
  }

  public String getHelp() {
    return "No help yet";
  }
}