StdOutput.h

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// -*- Mode: c++; c-basic-offset: 4; tab-width: 4; -*-

/****************************************************************************** 
 * 
 *  file:  StdOutput.h
 * 
 *  Copyright (c) 2004, Michael E. Smoot
 *  Copyright (c) 2017, Google LLC
 *  All rights reserved.
 * 
 *  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_STDCMDLINEOUTPUT_H
#define TCLAP_STDCMDLINEOUTPUT_H

#include <string>
#include <vector>
#include <list>
#include <iostream>
#include <algorithm>

#include <tclap/CmdLineInterface.h>
#include <tclap/CmdLineOutput.h>
#include <tclap/XorHandler.h>
#include <tclap/Arg.h>

namespace TCLAP {

class StdOutput : public CmdLineOutput
{

    public:

        virtual void usage(CmdLineInterface& c);

        virtual void version(CmdLineInterface& c);

        virtual void failure(CmdLineInterface& c, 
                     ArgException& e );

    protected:

        void _shortUsage( CmdLineInterface& c, std::ostream& os ) const;

        void _longUsage( CmdLineInterface& c, std::ostream& os ) const;

        void spacePrint( std::ostream& os, 
                         const std::string& s, 
                         int maxWidth, 
                         int indentSpaces, 
                         int secondLineOffset ) const;

};


inline void StdOutput::version(CmdLineInterface& _cmd) 
{
    std::string progName = _cmd.getProgramName();
    std::string xversion = _cmd.getVersion();

    std::cout << std::endl << progName << "  version: " 
              << xversion << std::endl << std::endl;
}

inline void StdOutput::usage(CmdLineInterface& _cmd ) 
{
    std::cout << std::endl << "USAGE: " << std::endl << std::endl; 

    _shortUsage( _cmd, std::cout );

    std::cout << std::endl << std::endl << "Where: " << std::endl << std::endl;

    _longUsage( _cmd, std::cout );

    std::cout << std::endl; 

}

inline void StdOutput::failure( CmdLineInterface& _cmd,
                                ArgException& e ) 
{
    std::string progName = _cmd.getProgramName();

    std::cerr << "PARSE ERROR: " << e.argId() << std::endl
              << "             " << e.error() << std::endl << std::endl;

    if ( _cmd.hasHelpAndVersion() )
        {
            std::cerr << "Brief USAGE: " << std::endl;

            _shortUsage( _cmd, std::cerr ); 

            std::cerr << std::endl << "For complete USAGE and HELP type: " 
                      << std::endl << "   " << progName << " "
                      << Arg::nameStartString() << "help"
                      << std::endl << std::endl;
        }
    else
        usage(_cmd);

    throw ExitException(1);
}

inline void 
StdOutput::_shortUsage( CmdLineInterface& _cmd, 
                        std::ostream& os ) const
{
    std::list<Arg*> argList = _cmd.getArgList();
    std::string progName = _cmd.getProgramName();
    XorHandler xorHandler = _cmd.getXorHandler();
    std::vector< std::vector<Arg*> > xorList = xorHandler.getXorList();

    std::string s = progName + " ";

    // first the xor
    for ( int i = 0; static_cast<unsigned int>(i) < xorList.size(); i++ )
        {
            s += " {";
            for ( ArgVectorIterator it = xorList[i].begin(); 
                  it != xorList[i].end(); it++ )
                s += (*it)->shortID() + "|";

            s[s.length()-1] = '}';
        }

    // then the rest
    for (ArgListIterator it = argList.begin(); it != argList.end(); it++)
        if ( !xorHandler.contains( (*it) ) )
            s += " " + (*it)->shortID();

    // if the program name is too long, then adjust the second line offset 
    int secondLineOffset = static_cast<int>(progName.length()) + 2;
    if ( secondLineOffset > 75/2 )
        secondLineOffset = static_cast<int>(75/2);

    spacePrint( os, s, 75, 3, secondLineOffset );
}

inline void 
StdOutput::_longUsage( CmdLineInterface& _cmd, 
                       std::ostream& os ) const
{
    std::list<Arg*> argList = _cmd.getArgList();
    std::string message = _cmd.getMessage();
    XorHandler xorHandler = _cmd.getXorHandler();
    std::vector< std::vector<Arg*> > xorList = xorHandler.getXorList();

    // first the xor 
    for ( int i = 0; static_cast<unsigned int>(i) < xorList.size(); i++ )
        {
            for ( ArgVectorIterator it = xorList[i].begin(); 
                  it != xorList[i].end(); 
                  it++ )
                {
                    spacePrint( os, (*it)->longID(), 75, 3, 3 );
                    spacePrint( os, (*it)->getDescription(), 75, 5, 0 );

                    if ( it+1 != xorList[i].end() )
                        spacePrint(os, "-- OR --", 75, 9, 0);
                }
            os << std::endl << std::endl;
        }

    // then the rest
    for (ArgListIterator it = argList.begin(); it != argList.end(); it++)
        if ( !xorHandler.contains( (*it) ) )
            {
                spacePrint( os, (*it)->longID(), 75, 3, 3 ); 
                spacePrint( os, (*it)->getDescription(), 75, 5, 0 ); 
                os << std::endl;
            }

    os << std::endl;

    spacePrint( os, message, 75, 3, 0 );
}

inline void StdOutput::spacePrint( std::ostream& os, 
                                   const std::string& s, 
                                   int maxWidth, 
                                   int indentSpaces, 
                                   int secondLineOffset ) const
{
    int len = static_cast<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<int>( len - start, allowedLen );
                    // doing it this way to support a VisualC++ 2005 bug 
                    using namespace std; 
                    int stringLen = min<int>( len - start, allowedLen );

                    // trim the length so it doesn't end in middle of a word
                    if ( stringLen == allowedLen )
                        while ( stringLen >= 0 &&
                                s[stringLen+start] != ' ' && 
                                s[stringLen+start] != ',' &&
                                s[stringLen+start] != '|' ) 
                            stringLen--;
    
                    // ok, the word is longer than the line, so just split 
                    // wherever the line ends
                    if ( stringLen <= 0 )
                        stringLen = allowedLen;

                    // 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
                    while ( s[stringLen+start] == ' ' && start < len )
                        start++;
            
                    start += stringLen;
                }
        }
    else
        {
            for ( int i = 0; i < indentSpaces; i++ )
                os << " ";
            os << s << std::endl;
        }
}

} //namespace TCLAP
#endif