Apply ansi coloring to a string in C++

ansi_color.cc

#include "ansi_color.h"

/**
 * @name inColor
 *
 * @brief returns a string, ansi-formatted to be displayed in a particular
 * color & style in the console.
 *
 * @param content - string content to wrap in ansi formatting
 * @param foreground - text foreground color (default: kAnsiColorDefault)
 * @param background - text background color (default: kAnsiColorDefault)
 * @param format - format to apply to the text (default: kAnsiFormatDefault)
 * @return string - the formatted (colored) string
 * @note The inspiration to create this function came from the following source:
 *  https://stackoverflow.com/questions/2616906/how-do-i-output-coloured-text-to-a-linux-terminal
 */
std::string inColor(const std::string content, AnsiColor foreground,
                    AnsiColor background, AnsiFormat format) {
  std::string fg, bg, fmt;

  // get the foreground ansi color code
  switch (foreground) {
    case kAnsiColorDefault:
      fg = "39;";
      break;
    case kAnsiColorBlack:
      fg = "30;";
      break;
    case kAnsiColorRed:
      fg = "31;";
      break;
    case kAnsiColorGreen:
      fg = "32;";
      break;
    case kAnsiColorYellow:
      fg = "33;";
      break;
    case kAnsiColorBlue:
      fg = "34;";
      break;
    case kAnsiColorMagenta:
      fg = "35;";
      break;
    case kAnsiColorCyan:
      fg = "36;";
      break;
    case kAnsiColorWhite:
      fg = "97;";
      break;
    case kAnsiColorGrey:
      fg = "37;";
      break;
    case kAnsiColorInvisible:
      fg = ";";
      break;
  }

  // get the background ansi color code
  switch (background) {
    case kAnsiColorDefault:
      bg = "49m";
      break;
    case kAnsiColorBlack:
      bg = "40m";
      break;
    case kAnsiColorRed:
      bg = "41m";
      break;
    case kAnsiColorGreen:
      bg = "42m";
      break;
    case kAnsiColorYellow:
      bg = "43m";
      break;
    case kAnsiColorBlue:
      bg = "44m";
      break;
    case kAnsiColorMagenta:
      bg = "45m";
      break;
    case kAnsiColorCyan:
      bg = "46m";
      break;
    case kAnsiColorWhite:
      bg = "107m";
      break;
    case kAnsiColorGrey:
      bg = "47m";
      break;
    case kAnsiColorInvisible:
      bg = "m";
      break;
  }

  // get the formatting style
  switch (format) {
    case kAnsiFormatDefault:
      fmt = "0;";
      break;
    case kAnsiFormatBold:
      fmt = "1;";
      break;
    case kAnsiFormatDim:
      fmt = "2;";
      break;
    case kAnsiFormatUnderlined:
      fmt = "3;";
      break;
    case kAnsiFormatBlink:
      fmt = "5;";
      break;
    case kAnsiFormatReverse:
      fmt = "7;";
      break;
    case kAnsiFormatHidden:
      fmt = "8;";
      break;
  }

  // wrap the content in the ansi color declaration and return the wrapped
  // content
  return kAnsiColorBegin + fmt + fg + bg + content + kAnsiColorEnd;
}

ansi_color.h

#include <string>

const char* kAnsiColorBegin = "\033[";
const char* kAnsiColorEnd = "\033[0m";

enum AnsiColor {
  kAnsiColorBlack,
  kAnsiColorRed,
  kAnsiColorGreen,
  kAnsiColorYellow,
  kAnsiColorBlue,
  kAnsiColorMagenta,
  kAnsiColorCyan,
  kAnsiColorWhite,
  kAnsiColorGrey,
  kAnsiColorDefault,
  kAnsiColorInvisible,
};

enum AnsiFormat {
  kAnsiFormatDefault,
  kAnsiFormatBold,
  kAnsiFormatDim,
  kAnsiFormatUnderlined,
  kAnsiFormatBlink,
  kAnsiFormatReverse,
  kAnsiFormatHidden,
};

std::string inColor(std::string content = "",
                    AnsiColor foreground = kAnsiColorDefault,
                    AnsiColor background = kAnsiColorDefault,
                    AnsiFormat format = kAnsiFormatDefault);