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Embeddable expression language for Java.

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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Twineworks GmbH
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.twineworks.tweakflow.repl.commands;

import com.twineworks.tweakflow.repl.ReplState;
import com.twineworks.tweakflow.repl.console.TextTerminal;
import net.sourceforge.argparse4j.inf.ArgumentParser;
import net.sourceforge.argparse4j.inf.Namespace;
import net.sourceforge.argparse4j.inf.Subparser;
import net.sourceforge.argparse4j.inf.Subparsers;

public class HelpCommand implements Command {

  public static void supplyParser(Subparsers subparsers, ArgumentParser parser) {
    Subparser subparser = subparsers.addParser("\\help", false);
    subparser.aliases("\\?");
    subparser.help("show usage information");
    subparser.setDefault("command", new HelpCommand(parser));
  }

  private final ArgumentParser parser;

  public HelpCommand(ArgumentParser parser) {
    this.parser = parser;
  }

  @Override
  public ReplState perform(Namespace args, String input, TextTerminal terminal, ReplState state) {
    terminal.println(parser.formatHelp());
    return state;
  }

}