AbstractCommandLineParser.java

package net.jangaroo.jooc.cli;

import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.CmdLineParser;

import java.io.StringWriter;

import static org.kohsuke.args4j.ExampleMode.ALL;

public abstract class AbstractCommandLineParser {

  public abstract String getShellScriptName();

  public StringBuilder extendedUsage(CmdLineParser parser, CmdLineException e) {
    StringBuilder msg = new StringBuilder();
    // if there's a problem in the command line,
    // you'll get this exception. this will report
    // an error message.
    if (e != null) {
      msg.append(e.getMessage());
      msg.append("\n");
    }
    msg.append(getShellScriptName()).append(" [options...] source files...\n");
    // print the list of available options
    StringWriter writer = new StringWriter();
    parser.printUsage(writer, null);
    msg.append(writer.getBuffer());
    msg.append("\n");
    // print option sample. This is useful some time
    msg.append("  Example: ").append(getShellScriptName()).append(parser.printExample(ALL));
    msg.append("\n");
    return msg;
  }
}