thezxtreme

Untitled

Mar 6th, 2020
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  1. #include <iostream>
  2. using std::ostream, std::cout, std::endl;
  3.  
  4. const char escape           = char( 27 );
  5. const char ansi_prefix[3]   = {escape, '[', '\0'};
  6.  
  7. // Based on code from an example at
  8. // <url: https://docs.microsoft.com/en-us/windows/console/console-virtual-terminal-sequences>:
  9. #ifdef _WIN32
  10.     #include <stdint.h>
  11.     namespace winapi {
  12.         using BOOL      = int;
  13.         using HANDLE    = void*;
  14.         using DWORD     = uint32_t;
  15.         const auto STD_OUTPUT_HANDLE                    = static_cast<DWORD>( -11 );
  16.         const auto ENABLE_VIRTUAL_TERMINAL_PROCESSING   = static_cast<DWORD>( 4 );
  17.         const auto INVALID_HANDLE_VALUE                 = reinterpret_cast<HANDLE>( -1 );
  18.  
  19.         extern "C" auto __stdcall GetStdHandle( const DWORD ) -> HANDLE;
  20.         extern "C" auto __stdcall GetConsoleMode( HANDLE, DWORD* ) -> BOOL;
  21.         extern "C" auto __stdcall SetConsoleMode( HANDLE, DWORD ) -> BOOL;
  22.  
  23.         inline auto enable_virtual_terminal_mode()
  24.             -> bool
  25.         {
  26.             const HANDLE output_handle = GetStdHandle( STD_OUTPUT_HANDLE );
  27.             if( output_handle == INVALID_HANDLE_VALUE) {
  28.                 return false;
  29.             }
  30.  
  31.             DWORD mode = 0;
  32.             if( not GetConsoleMode( output_handle, &mode ) ){
  33.                 return false;
  34.             }
  35.  
  36.             mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
  37.             return !!SetConsoleMode( output_handle, mode );
  38.         }
  39.        
  40.         inline const bool colors_are_available = enable_virtual_terminal_mode();
  41.     }  // namespace winapi
  42. #endif
  43.  
  44. // From the same Microsoft page:
  45. struct Ansi_color{ enum Enum: int {
  46.     original_colors             =   0,          // Returns to default state prior to modification.
  47.     bold_or_bright              =   1,          // Applies brightness/intensity flag to foreground color
  48.     underline                   =   4,          // Adds underline
  49.     no_underline                =  24,          // Removes underline
  50.     negative                    =   7,          // Swaps foreground and background colors
  51.     positive                    =  27,          // Returns foreground/background to normal
  52.     foreground_black            =  30,          // Applies non-bold/bright black to foreground
  53.     foreground_red              =  31,          // Applies non-bold/bright red to foreground
  54.     foreground_green            =  32,          // Applies non-bold/bright green to foreground
  55.     foreground_yellow           =  33,          // Applies non-bold/bright yellow to foreground
  56.     foreground_blue             =  34,          // Applies non-bold/bright blue to foreground
  57.     foreground_magenta          =  35,          // Applies non-bold/bright magenta to foreground
  58.     foreground_cyan             =  36,          // Applies non-bold/bright cyan to foreground
  59.     foreground_white            =  37,          // Applies non-bold/bright white to foreground
  60.     foreground_extended         =  38,          // Applies extended color value to the foreground (see details below)
  61.     foreground_default          =  39,          // Applies only the foreground portion of the defaults (see 0)
  62.     background_black            =  40,          // Applies non-bold/bright black to background
  63.     background_red              =  41,          // Applies non-bold/bright red to background
  64.     background_green            =  42,          // Applies non-bold/bright green to background
  65.     background_yellow           =  43,          // Applies non-bold/bright yellow to background
  66.     background_blue             =  44,          // Applies non-bold/bright blue to background
  67.     background_magenta          =  45,          // Applies non-bold/bright magenta to background
  68.     background_cyan             =  46,          // Applies non-bold/bright cyan to background
  69.     background_white            =  47,          // Applies non-bold/bright white to background
  70.     background_extended         =  48,          // Applies extended color value to the background (see details below)
  71.     background_default          =  49,          // Applies only the background portion of the defaults (see 0)
  72.     bright_foreground_black     =  90,          // Applies bold/bright black to foreground
  73.     bright_foreground_red       =  91,          // Applies bold/bright red to foreground
  74.     bright_foreground_green     =  92,          // Applies bold/bright green to foreground
  75.     bright_foreground_yellow    =  93,          // Applies bold/bright yellow to foreground
  76.     bright_foreground_blue      =  94,          // Applies bold/bright blue to foreground
  77.     bright_foreground_magenta   =  95,          // Applies bold/bright magenta to foreground
  78.     bright_foreground_cyan      =  96,          // Applies bold/bright cyan to foreground
  79.     bright_foreground_white     =  97,          // Applies bold/bright white to foreground
  80.     bright_background_black     = 100,          // Applies bold/bright black to background
  81.     bright_background_red       = 101,          // Applies bold/bright red to background
  82.     bright_background_green     = 102,          // Applies bold/bright green to background
  83.     bright_background_yellow    = 103,          // Applies bold/bright yellow to background
  84.     bright_background_blue      = 104,          // Applies bold/bright blue to background
  85.     bright_background_magenta   = 105,          // Applies bold/bright magenta to background
  86.     bright_background_cyan      = 106,          // Applies bold/bright cyan to background
  87.     bright_background_white     = 107           // Applies bold/bright white to background
  88. }; };
  89.  
  90. auto operator<<( ostream& stream, const Ansi_color::Enum code )
  91.     -> ostream&
  92. { return stream << ansi_prefix << +code << 'm'; }
  93.  
  94. auto main() -> int
  95. {
  96.     cout << "Colored text:" << endl;
  97.     for(    int code = Ansi_color::bright_foreground_red;
  98.             code <= Ansi_color::bright_foreground_white;
  99.             ++code ) {
  100.         cout << Ansi_color::Enum( code ) << "word ";
  101.     }
  102.     cout << Ansi_color::original_colors << endl;
  103.     cout << "And that was that." << endl;
  104. }
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