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package joptsimple.examples;
import java.io.File;
import java.util.HashSet;
import java.util.Map;
import static java.io.File.*;
import static java.util.Arrays.*;
import joptsimple.HelpFormatter;
import joptsimple.OptionDescriptor;
import joptsimple.OptionParser;
import static joptsimple.util.DateConverter.*;
public class HelpFormatterExample {
static class MyFormatter implements HelpFormatter {
public String format( Map<String, ? extends OptionDescriptor> options ) {
StringBuilder buffer = new StringBuilder();
for ( OptionDescriptor each : new HashSet<>( options.values() ) ) {
buffer.append( lineFor( each ) );
}
return buffer.toString();
}
private String lineFor( OptionDescriptor descriptor ) {
if ( descriptor.representsNonOptions() ) {
return descriptor.argumentDescription() + '(' + descriptor.argumentTypeIndicator() + "): "
+ descriptor.description() + System.getProperty( "line.separator" );
}
StringBuilder line = new StringBuilder( descriptor.options().toString() );
line.append( ": description = " ).append( descriptor.description() );
line.append( ", required = " ).append( descriptor.isRequired() );
line.append( ", accepts arguments = " ).append( descriptor.acceptsArguments() );
line.append( ", requires argument = " ).append( descriptor.requiresArgument() );
line.append( ", argument description = " ).append( descriptor.argumentDescription() );
line.append( ", argument type indicator = " ).append( descriptor.argumentTypeIndicator() );
line.append( ", default values = " ).append( descriptor.defaultValues() );
line.append( System.getProperty( "line.separator" ) );
return line.toString();
}
}
public static void main( String[] args ) throws Exception {
OptionParser parser = new OptionParser() {
{
accepts( "c" ).withRequiredArg().ofType( Integer.class )
.describedAs( "count" ).defaultsTo( 1 );
accepts( "q" ).withOptionalArg().ofType( Double.class )
.describedAs( "quantity" );
accepts( "d", "some date" ).withRequiredArg().required()
.withValuesConvertedBy( datePattern( "MM/dd/yy" ) );
acceptsAll( asList( "v", "talkative", "chatty" ), "be more verbose" );
accepts( "output-file" ).withOptionalArg().ofType( File.class )
.describedAs( "file" );
acceptsAll( asList( "h", "?" ), "show help" ).forHelp();
acceptsAll( asList( "cp", "classpath" ) ).withRequiredArg()
.describedAs( "path1" + pathSeparatorChar + "path2:..." )
.ofType( File.class )
.withValuesSeparatedBy( pathSeparatorChar );
nonOptions( "files to chew on" ).ofType( File.class ).describedAs( "input files" );
}
};
parser.formatHelpWith( new MyFormatter() );
parser.printHelpOn( System.out );
}
}
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