package org.djutils.cli;
   
   import static org.junit.Assert.assertEquals;
   
   import org.djutils.exceptions.Throw;
   import org.junit.Test;
   
   import picocli.CommandLine;
   import picocli.CommandLine.Command;
  import picocli.CommandLine.ITypeConverter;
  import picocli.CommandLine.Option;
  
  /**
   * Program to test the CLI. <br>
   * <br>
   * Copyright (c) 2003-2018 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See
   * for project information <a href="https://www.simulation.tudelft.nl/" target="_blank">www.simulation.tudelft.nl</a>. The
   * source code and binary code of this software is proprietary information of Delft University of Technology.
   * @author <a href="https://www.tudelft.nl/averbraeck" target="_blank">Alexander Verbraeck</a>
   */
  public class TestCLIRegisterConverter
  {
      /** lat/lon object that can be parsed. */
      public static class LatLon
      {
          /** lat. */
          private final double lat;
  
          /** lon. */
          private final double lon;
  
          /**
           * @param lat lat
           * @param lon lon
           */
          public LatLon(final double lat, final double lon)
          {
              this.lat = lat;
              this.lon = lon;
          }
  
          /**
           * @return lat
           */
          public double getLat()
          {
              return this.lat;
          }
  
          /**
           * @return lon
           */
          public double getLon()
          {
              return this.lon;
          }
  
          /**
           * parse a string of the form (lat, lon).
           * @param latlon the string to parse
           * @return the LatLon object
           * @throws RuntimeException on error
           */
          public static LatLon of(final String latlon) throws RuntimeException
          {
              String ll = latlon;
              Throw.when(!ll.startsWith("("), RuntimeException.class, "string does not contain '('");
              Throw.when(!ll.endsWith(")"), RuntimeException.class, "string does not contain ')'");
              ll = ll.replaceAll("\\(", "").replaceAll("\\)", "");
              String[] llArr = ll.split("\\,");
              Throw.when(llArr.length != 2, RuntimeException.class, "string does not contain one ','");
              double lat = Double.parseDouble(llArr[0].trim());
              double lon = Double.parseDouble(llArr[1].trim());
              return new LatLon(lat, lon);
          }
      }
  
      /** */
      @Command(description = "Test program for CLI", name = "Program", mixinStandardHelpOptions = true, version = "1.0")
      public static class Options
      {
          /** */
          @Option(names = {"-l", "--latlon"}, description = "Latitude and longitude of the form '(lat, lon)'")
          private LatLon latLon;
  
          /** @return the lat/lon */
          public LatLon getLatLon()
          {
              return this.latLon;
          }
      }
  
      /**
       * Convert a LatLon string to a LatLon object.
       */
      public static class LatLonConverter implements ITypeConverter<LatLon>
      {
          /** {@inheritDoc} */
          @Override
         public LatLon convert(final String value) throws Exception
         {
             return LatLon.of(value);
         }
     }
 
     /**
      * Test the CliUtil methods for registering user-defined converters.
      * @throws CliException on error
      * @throws IllegalAccessException on error
      * @throws IllegalArgumentException on error
      * @throws NoSuchFieldException on error
      */
     @Test
     public void testCliRegisterConverters()
             throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException, CliException
     {
         // test CliUtil with CommandLine
         String[] args = new String[] {"-l", "(50.2,71.3)"};
         Options options = new Options();
         CommandLine cmd = new CommandLine(options);
         cmd.registerConverter(LatLon.class, new LatLonConverter());
         CliUtil.execute(cmd, args);
         assertEquals(50.2, options.getLatLon().getLat(), 0.001);
         assertEquals(71.3, options.getLatLon().getLon(), 0.001);
     }
 }