package org.apache.maven.internal;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Pattern;
  
  /**
   * Helper class to format multiline messages to the console
   */
  public class MultilineMessageHelper
  {
  
      private static final int DEFAULT_MAX_SIZE = 65;
      private static final char BOX_CHAR = '*';
  
      private static final Pattern S_FILTER = Pattern.compile( "\\s+" );
  
      public static String separatorLine()
      {
          StringBuilder sb = new StringBuilder( DEFAULT_MAX_SIZE );
          repeat( sb, '*', DEFAULT_MAX_SIZE );
          return sb.toString();
      }
  
      public static List<String> format( String... lines )
      {
          int size = DEFAULT_MAX_SIZE;
          int remainder = size - 4; // 4 chars = 2 box_char + 2 spaces
          List<String> result = new ArrayList<>();
          StringBuilder sb = new StringBuilder( size );
          // first line
          sb.setLength( 0 );
          repeat( sb, BOX_CHAR, size );
          result.add( sb.toString() );
          // lines
          for ( String line : lines )
          {
              sb.setLength( 0 );
              String[] words = S_FILTER.split( line );
              for ( String word : words )
              {
                  if ( sb.length() >= remainder - word.length() - ( sb.length() > 0 ? 1 : 0 ) )
                  {
                      repeat( sb, ' ', remainder - sb.length() );
                      result.add( BOX_CHAR + " " + sb + " " + BOX_CHAR );
                      sb.setLength( 0 );
                  }
                  if ( sb.length() > 0 )
                  {
                      sb.append( ' ' );
                  }
                  sb.append( word );
              }
  
              while ( sb.length() < remainder )
              {
                  sb.append( ' ' );
              }
              result.add( BOX_CHAR + " " + sb + " " + BOX_CHAR );
          }
          // last line
          sb.setLength( 0 );
          repeat( sb, BOX_CHAR, size );
          result.add( sb.toString() );
          return result;
      }
  
      private static void repeat( StringBuilder sb, char c, int nb )
      {
          for ( int i = 0; i < nb; i++ )
          {
              sb.append( c );
          }
      }
  }