Catch2/include/internal/catch_console_colour_impl.hpp

/*
 *  Created by Phil on 25/2/2012.
 *  Copyright 2012 Two Blue Cubes Ltd. All rights reserved.
 *
 *  Distributed under the Boost Software License, Version 1.0. (See accompanying
 *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 */
#ifndef TWOBLUECUBES_CATCH_CONSOLE_COLOUR_IMPL_HPP_INCLUDED
#define TWOBLUECUBES_CATCH_CONSOLE_COLOUR_IMPL_HPP_INCLUDED

#include "catch_console_colour.hpp"

namespace Catch { namespace Detail {
    struct IColourImpl {
        virtual ~IColourImpl() {}
        virtual void use( Colour::Code _colourCode ) = 0;
    };
}}

#if defined ( CATCH_PLATFORM_WINDOWS ) /////////////////////////////////////////

#include <windows.h>

namespace Catch {
namespace {
    
    class Win32ColourImpl : public Detail::IColourImpl {
    public:
        Win32ColourImpl() : stdoutHandle( GetStdHandle(STD_OUTPUT_HANDLE) )
        {
            CONSOLE_SCREEN_BUFFER_INFO csbiInfo;
            GetConsoleScreenBufferInfo( stdoutHandle, &csbiInfo );
            originalAttributes = csbiInfo.wAttributes;
        }

        virtual void use( Colour::Code _colourCode ) {
            switch( _colourCode ) {
                case Colour::None:      return setTextAttribute( originalAttributes );
                case Colour::White:     return setTextAttribute( FOREGROUND_GREEN | FOREGROUND_RED | FOREGROUND_BLUE );
                case Colour::Red:       return setTextAttribute( FOREGROUND_RED );
                case Colour::Green:     return setTextAttribute( FOREGROUND_GREEN );
                case Colour::Blue:      return setTextAttribute( FOREGROUND_BLUE );
                case Colour::Cyan:      return setTextAttribute( FOREGROUND_BLUE | FOREGROUND_GREEN );
                case Colour::Yellow:    return setTextAttribute( FOREGROUND_RED | FOREGROUND_GREEN );
                case Colour::Grey:      return setTextAttribute( 0 );

                case Colour::LightGrey:     return setTextAttribute( FOREGROUND_INTENSITY );
                case Colour::BrightRed:     return setTextAttribute( FOREGROUND_INTENSITY | FOREGROUND_RED );
                case Colour::BrightGreen:   return setTextAttribute( FOREGROUND_INTENSITY | FOREGROUND_GREEN );
                case Colour::BrightWhite:   return setTextAttribute( FOREGROUND_INTENSITY |  FOREGROUND_GREEN | FOREGROUND_RED | FOREGROUND_BLUE );

                case Colour::Bright: throw std::logic_error( "not a colour" );
            }
        }

    private:    
        void setTextAttribute( WORD _textAttribute ) {
            SetConsoleTextAttribute( stdoutHandle, _textAttribute );
        }
        HANDLE stdoutHandle;
        WORD originalAttributes;
    };

    inline bool shouldUseColourForPlatform() {
        return true;
    }
    
    Win32ColourImpl platformColourImpl;

} // end anon namespace
} // end namespace Catch

#else // Not Windows - assumed to be POSIX compatible //////////////////////////

#include <unistd.h>

namespace Catch {
namespace {

    // use POSIX/ ANSI console terminal codes
    // Thanks to Adam Strzelecki for original contribution
    // (http://github.com/nanoant)
    // https://github.com/philsquared/Catch/pull/131
    class PosixColourImpl : public Detail::IColourImpl {
    public:
        virtual void use( Colour::Code _colourCode ) {
            switch( _colourCode ) {
                case Colour::None:
                case Colour::White:     return setColour( "[0m" );
                case Colour::Red:       return setColour( "[0;31m" );
                case Colour::Green:     return setColour( "[0;32m" );
                case Colour::Blue:      return setColour( "[0:34m" );
                case Colour::Cyan:      return setColour( "[0;36m" );
                case Colour::Yellow:    return setColour( "[0;33m" );
                case Colour::Grey:      return setColour( "[1;30m" );

                case Colour::LightGrey:     return setColour( "[0;37m" );
                case Colour::BrightRed:     return setColour( "[1;31m" );
                case Colour::BrightGreen:   return setColour( "[1;32m" );
                case Colour::BrightWhite:   return setColour( "[1;37m" );
                
                case Colour::Bright: throw std::logic_error( "not a colour" );
            }
        }
    private:    
        void setColour( const char* _escapeCode ) {
            std::cout << '\033' << _escapeCode;
        }
    };

    inline bool shouldUseColourForPlatform() {
        return isatty( fileno(stdout) );
    }
    
    PosixColourImpl platformColourImpl;
    
} // end anon namespace
} // end namespace Catch

#endif // not Windows

namespace Catch {

    namespace {
        struct NoColourImpl : Detail::IColourImpl {
            void use( Colour::Code ) {}
        };
        NoColourImpl noColourImpl;        
        static const bool shouldUseColour = shouldUseColourForPlatform() &&
                                            !isDebuggerActive();
    }

    Colour::Colour( Code _colourCode ){ use( _colourCode ); }
    Colour::~Colour(){ use( None ); }
    void Colour::use( Code _colourCode ) {
        impl->use( _colourCode );
    }

    Detail::IColourImpl* Colour::impl = shouldUseColour
            ? static_cast<Detail::IColourImpl*>( &platformColourImpl )
            : static_cast<Detail::IColourImpl*>( &noColourImpl );

} // end namespace Catch

#endif // TWOBLUECUBES_CATCH_CONSOLE_COLOUR_IMPL_HPP_INCLUDED