第十三號艦隊
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Print Ansi Color String on Terminal

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有時候想要在Linux的Terminal想要印出彩色字串方便，可以有以下方法

C Solution

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#include <stdio.h>
#define ANSI_COLOR_RED     "\x1b[31m"
#define ANSI_COLOR_GREEN   "\x1b[32m"
#define ANSI_COLOR_YELLOW  "\x1b[33m"
#define ANSI_COLOR_BLUE    "\x1b[34m"
#define ANSI_COLOR_MAGENTA "\x1b[35m"
#define ANSI_COLOR_CYAN    "\x1b[36m"
#define ANSI_COLOR_RESET   "\x1b[0m"
};

int main (int argc, char const *argv[]) {

  printf(ANSI_COLOR_RED     "This text is RED!"     ANSI_COLOR_RESET "\n");
  printf(ANSI_COLOR_GREEN   "This text is GREEN!"   ANSI_COLOR_RESET "\n");
  printf(ANSI_COLOR_YELLOW  "This text is YELLOW!"  ANSI_COLOR_RESET "\n");
  printf(ANSI_COLOR_BLUE    "This text is BLUE!"    ANSI_COLOR_RESET "\n");
  printf(ANSI_COLOR_MAGENTA "This text is MAGENTA!" ANSI_COLOR_RESET "\n");
  printf(ANSI_COLOR_CYAN    "This text is CYAN!"    ANSI_COLOR_RESET "\n");
  return 0;
}

這方法簡單，不過麻煩的是要手動加上Color跟Reset標籤在文字前後。

C++11 Solution

突然想到可以用C++11的新特性User defined literal來簡化，可以減少不少手動置入的風險。也可以練習User defined literal的如何使用。

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#include <stdio.h>
#include <string>
namespace {
        #define ANSI_COLOR_RED     "\x1b[31m"
        #define ANSI_COLOR_GREEN   "\x1b[32m"
        #define ANSI_COLOR_YELLOW  "\x1b[33m"
        #define ANSI_COLOR_BLUE    "\x1b[34m"
        #define ANSI_COLOR_MAGENTA "\x1b[35m"
        #define ANSI_COLOR_CYAN    "\x1b[36m"
        #define ANSI_COLOR_RESET   "\x1b[0m"


        #define DEFINE_COLOR_STRING(color) \
                std::string operator"" _##color (const char* str) \
                { \
                        std::string tmp(ANSI_COLOR_##color); \
                        tmp += str; \
                        tmp += ANSI_COLOR_RESET; \
                        return tmp;\
                }
        DEFINE_COLOR_STRING(RED);
        DEFINE_COLOR_STRING(GREEN);
        DEFINE_COLOR_STRING(YELLOW);
        DEFINE_COLOR_STRING(BLUE);
        DEFINE_COLOR_STRING(MAGENTA);
        DEFINE_COLOR_STRING(CYAN);
};
std::cout << 123_RED << 456_YELLOW << 789_BLUE << std::endl;

不過User Defined Literal前的字串似乎不能寫成”123 456”_RED這種形式。有點可惜

```