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A Java library for parsing command line options
/*
The MIT License
Copyright (c) 2004-2013 Paul R. Holser, Jr.
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 joptsimple;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import joptsimple.internal.Rows;
import joptsimple.internal.Strings;
import static joptsimple.ParserRules.*;
import static joptsimple.internal.Classes.*;
import static joptsimple.internal.Strings.*;
/**
* A help formatter that allows configuration of overall row width and column separator width.
*
* The formatter produces a two-column output. The left column is for the options, and the right column for their
* descriptions. The formatter will allow as much space as possible for the descriptions, by minimizing the option
* column's width, no greater than slightly less than half the overall desired width.
*
* @author Paul Holser
*/
public class BuiltinHelpFormatter implements HelpFormatter {
private final Rows nonOptionRows;
private final Rows optionRows;
/**
* Makes a formatter with a pre-configured overall row width and column separator width.
*/
BuiltinHelpFormatter() {
this( 80, 2 );
}
/**
* Makes a formatter with a given overall row width and column separator width.
*
* @param desiredOverallWidth how many characters wide to make the overall help display
* @param desiredColumnSeparatorWidth how many characters wide to make the separation between option column and
* description column
*/
public BuiltinHelpFormatter( int desiredOverallWidth, int desiredColumnSeparatorWidth ) {
nonOptionRows = new Rows( desiredOverallWidth * 2, 0 );
optionRows = new Rows( desiredOverallWidth, desiredColumnSeparatorWidth );
}
public String format( Map options ) {
Comparator comparator =
new Comparator() {
public int compare( OptionDescriptor first, OptionDescriptor second ) {
return first.options().iterator().next().compareTo( second.options().iterator().next() );
}
};
Set sorted = new TreeSet( comparator );
sorted.addAll( options.values() );
addRows( sorted );
return formattedHelpOutput();
}
private String formattedHelpOutput() {
StringBuilder formatted = new StringBuilder();
String nonOptionDisplay = nonOptionRows.render();
if ( !Strings.isNullOrEmpty( nonOptionDisplay ) )
formatted.append( nonOptionDisplay ).append( LINE_SEPARATOR );
formatted.append( optionRows.render() );
return formatted.toString();
}
private void addRows( Collection options ) {
addNonOptionsDescription( options );
if ( options.isEmpty() )
optionRows.add( "No options specified", "" );
else {
addHeaders( options );
addOptions( options );
}
fitRowsToWidth();
}
private void addNonOptionsDescription( Collection options ) {
OptionDescriptor nonOptions = findAndRemoveNonOptionsSpec( options );
if ( shouldShowNonOptionArgumentDisplay( nonOptions ) ) {
nonOptionRows.add( "Non-option arguments:", "" );
nonOptionRows.add(createNonOptionArgumentsDisplay(nonOptions), "");
}
}
private boolean shouldShowNonOptionArgumentDisplay( OptionDescriptor nonOptions ) {
return !Strings.isNullOrEmpty( nonOptions.description() )
|| !Strings.isNullOrEmpty( nonOptions.argumentTypeIndicator() )
|| !Strings.isNullOrEmpty( nonOptions.argumentDescription() );
}
private String createNonOptionArgumentsDisplay(OptionDescriptor nonOptions) {
StringBuilder buffer = new StringBuilder();
maybeAppendOptionInfo( buffer, nonOptions );
maybeAppendNonOptionsDescription( buffer, nonOptions );
return buffer.toString();
}
private void maybeAppendNonOptionsDescription( StringBuilder buffer, OptionDescriptor nonOptions ) {
buffer.append( buffer.length() > 0 && !Strings.isNullOrEmpty( nonOptions.description() ) ? " -- " : "" )
.append( nonOptions.description() );
}
private OptionDescriptor findAndRemoveNonOptionsSpec( Collection options ) {
for ( Iterator it = options.iterator(); it.hasNext(); ) {
OptionDescriptor next = it.next();
if ( next.representsNonOptions() ) {
it.remove();
return next;
}
}
throw new AssertionError( "no non-options argument spec" );
}
private void addHeaders( Collection options ) {
if ( hasRequiredOption( options ) ) {
optionRows.add("Option (* = required)", "Description");
optionRows.add("---------------------", "-----------");
} else {
optionRows.add("Option", "Description");
optionRows.add("------", "-----------");
}
}
private boolean hasRequiredOption( Collection options ) {
for ( OptionDescriptor each : options ) {
if ( each.isRequired() )
return true;
}
return false;
}
private void addOptions( Collection options ) {
for ( OptionDescriptor each : options ) {
if ( !each.representsNonOptions() )
optionRows.add( createOptionDisplay( each ), createDescriptionDisplay( each ) );
}
}
private String createOptionDisplay( OptionDescriptor descriptor ) {
StringBuilder buffer = new StringBuilder( descriptor.isRequired() ? "* " : "" );
for ( Iterator i = descriptor.options().iterator(); i.hasNext(); ) {
String option = i.next();
buffer.append( option.length() > 1 ? DOUBLE_HYPHEN : HYPHEN );
buffer.append( option );
if ( i.hasNext() )
buffer.append( ", " );
}
maybeAppendOptionInfo( buffer, descriptor );
return buffer.toString();
}
private void maybeAppendOptionInfo( StringBuilder buffer, OptionDescriptor descriptor ) {
String indicator = extractTypeIndicator( descriptor );
String description = descriptor.argumentDescription();
if ( indicator != null || !isNullOrEmpty( description ) )
appendOptionHelp( buffer, indicator, description, descriptor.requiresArgument() );
}
private String extractTypeIndicator( OptionDescriptor descriptor ) {
String indicator = descriptor.argumentTypeIndicator();
if ( !isNullOrEmpty( indicator ) && !String.class.getName().equals( indicator ) )
return shortNameOf( indicator );
return null;
}
private void appendOptionHelp( StringBuilder buffer, String typeIndicator, String description, boolean required ) {
if ( required )
appendTypeIndicator( buffer, typeIndicator, description, '<', '>' );
else
appendTypeIndicator( buffer, typeIndicator, description, '[', ']' );
}
private void appendTypeIndicator( StringBuilder buffer, String typeIndicator, String description,
char start, char end ) {
buffer.append( ' ' ).append( start );
if ( typeIndicator != null )
buffer.append( typeIndicator );
if ( !Strings.isNullOrEmpty( description ) ) {
if ( typeIndicator != null )
buffer.append( ": " );
buffer.append( description );
}
buffer.append( end );
}
private String createDescriptionDisplay( OptionDescriptor descriptor ) {
List defaultValues = descriptor.defaultValues();
if ( defaultValues.isEmpty() )
return descriptor.description();
String defaultValuesDisplay = createDefaultValuesDisplay( defaultValues );
return ( descriptor.description() + ' ' + surround( "default: " + defaultValuesDisplay, '(', ')' ) ).trim();
}
private String createDefaultValuesDisplay( List defaultValues ) {
return defaultValues.size() == 1 ? defaultValues.get( 0 ).toString() : defaultValues.toString();
}
private void fitRowsToWidth() {
nonOptionRows.fitToWidth();
optionRows.fitToWidth();
}
}