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A Java library for parsing command line options
There is a newer version: 6.0-alpha-3
/*
 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.internal;

import java.util.LinkedHashSet;
import java.util.Set;

import static java.lang.Math.*;

import static joptsimple.internal.Strings.*;

/**
 * @author Paul Holser
 */
public class Rows {
    private final int overallWidth;
    private final int columnSeparatorWidth;
    private final Set rows = new LinkedHashSet();
    private int widthOfWidestOption;
    private int widthOfWidestDescription;

    public Rows( int overallWidth, int columnSeparatorWidth ) {
        this.overallWidth = overallWidth;
        this.columnSeparatorWidth = columnSeparatorWidth;
    }

    public void add( String option, String description ) {
        add( new Row( option, description ) );
    }

    private void add( Row row ) {
        rows.add( row );
        widthOfWidestOption = max( widthOfWidestOption, row.option.length() );
        widthOfWidestDescription = max( widthOfWidestDescription, row.description.length() );
    }

    private void reset() {
        rows.clear();
        widthOfWidestOption = 0;
        widthOfWidestDescription = 0;
    }

    public void fitToWidth() {
        Columns columns = new Columns( optionWidth(), descriptionWidth() );

        Set fitted = new LinkedHashSet();
        for ( Row each : rows )
            fitted.addAll( columns.fit( each ) );

        reset();

        for ( Row each : fitted )
            add( each );
    }

    public String render() {
        StringBuilder buffer = new StringBuilder();

        for ( Row each : rows ) {
            pad( buffer, each.option, optionWidth() ).append( repeat( ' ', columnSeparatorWidth ) );
            pad( buffer, each.description, descriptionWidth() ).append( LINE_SEPARATOR );
        }

        return buffer.toString();
    }

    private int optionWidth() {
        return min( ( overallWidth - columnSeparatorWidth ) / 2, widthOfWidestOption );
    }

    private int descriptionWidth() {
        return min( ( overallWidth - columnSeparatorWidth ) / 2, widthOfWidestDescription );
    }

    private StringBuilder pad( StringBuilder buffer, String s, int length ) {
        buffer.append( s ).append( repeat( ' ', length - s.length() ) );
        return buffer;
    }
}