PrintSensibly.h

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/****************************************************************************** 
 * 
 *  @file  PrintSensibly.h
 * 
 *  Copyright (c) 2004, Michael E. Smoot .
 *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
 *  All rights reverved.
 * 
 *  See the file COPYING in the top directory of this distribution for
 *  more information.
 *  
 *  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.  
 *  
 *****************************************************************************/ 

#ifndef TCLAP_PRINTSENSIBLY_H
#define TCLAP_PRINTSENSIBLY_H

#include <iostream>
#include <algorithm>
#include <string>

namespace TCLAP {

inline void spacePrint( std::ostream& os, 
                              const std::string& s, 
                              int maxWidth, 
                              int indentSpaces=0, 
                              int secondLineOffset=0 )
{
     int len = (int)(s.length());

     if ( (len + indentSpaces > maxWidth) && maxWidth > 0 )
     {
          int allowedLen = maxWidth - indentSpaces;
          int start = 0;
          while ( start < len )
          {
               // find the substring length
               int stringLen = std::min( len - start, allowedLen );

               // trim the length so it doesn't end in middle of a word
               if ( stringLen == allowedLen )
                    while ( s[stringLen+start] != ' ' && 
                            s[stringLen+start] != ',' &&
                            s[stringLen+start] != '|' )
                         stringLen--;
               
               // check for newlines
               for ( int i = 0; i < stringLen; i++ )
                    if ( s[start+i] == '\n' )
                         stringLen = i+1;

               // print the indent 
               for ( int i = 0; i < indentSpaces; i++ )
                    os << " ";

               if ( start == 0 )
               {
                    // handle second line offsets
                    indentSpaces += secondLineOffset;

                    // adjust allowed len
                    allowedLen -= secondLineOffset;
               }
               
               os << s.substr(start,stringLen) << std::endl;

               // so we don't start a line with a space
               if ( s[stringLen+start] == ' ' )
                    start++;
               
               start += stringLen;
          }
     }
     else
     {
          for ( int i = 0; i < indentSpaces; i++ )
                    os << " ";
          os << s << std::endl;
     }
}

} //namespace TCLAP

#endif

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