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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) 2004-2015 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.text.BreakIterator;
import java.util.ArrayList;
import java.util.List;

import static java.text.BreakIterator.*;

import static joptsimple.internal.Strings.*;

/**
 * @author Paul Holser
 */
class Columns {
    private static final int INDENT_WIDTH = 2;

    private final int optionWidth;
    private final int descriptionWidth;

    Columns( int optionWidth, int descriptionWidth ) {
        this.optionWidth = optionWidth;
        this.descriptionWidth = descriptionWidth;
    }

    List fit( Row row ) {
        List options = piecesOf( row.option, optionWidth );
        List descriptions = piecesOf( row.description, descriptionWidth );

        List rows = new ArrayList<>();
        for ( int i = 0; i < Math.max( options.size(), descriptions.size() ); ++i )
            rows.add( new Row( itemOrEmpty( options, i ), itemOrEmpty( descriptions, i ) ) );

        return rows;
    }

    private static String itemOrEmpty( List items, int index ) {
        return index >= items.size() ? "" : items.get( index );
    }

    private List piecesOf( String raw, int width ) {
        List pieces = new ArrayList<>();

        for ( String each : raw.trim().split( LINE_SEPARATOR ) )
            pieces.addAll( piecesOfEmbeddedLine( each, width ) );

        return pieces;
    }

    private List piecesOfEmbeddedLine( String line, int width ) {
        List pieces = new ArrayList<>();

        BreakIterator words = BreakIterator.getLineInstance();
        words.setText( line );

        StringBuilder nextPiece = new StringBuilder();

        int start = words.first();
        for ( int end = words.next(); end != DONE; start = end, end = words.next() )
            nextPiece = processNextWord( line, nextPiece, start, end, width, pieces );

        if ( nextPiece.length() > 0 )
            pieces.add( nextPiece.toString() );

        return pieces;
    }

    private StringBuilder processNextWord( String source, StringBuilder nextPiece, int start, int end, int width,
                                           List pieces ) {
        StringBuilder augmented = nextPiece;

        String word = source.substring( start, end );
        if ( augmented.length() + word.length() > width ) {
            pieces.add( augmented.toString().replaceAll( "\\s+$", "" ) );
            augmented = new StringBuilder( repeat( ' ', INDENT_WIDTH ) ).append( word );
        }
        else
            augmented.append( word );

        return augmented;
    }
}