Minor improvments to ansicolor sink

include/spdlog/sinks/ansicolor_sink-inl.h

@@ -22,14 +22,14 @@ SPDLOG_INLINE ansicolor_sink<ConsoleMutex>::ansicolor_sink(FILE *target_file, co
     colors_[level::trace] = white;
     colors_[level::debug] = cyan;
     colors_[level::info] = green;
-    colors_[level::warn] = yellow + bold;
-    colors_[level::err] = red + bold;
-    colors_[level::critical] = bold + on_red;
+    colors_[level::warn] = yellow_bold;
+    colors_[level::err] = red_bold;
+    colors_[level::critical] = bold_on_red;
     colors_[level::off] = reset;
 }
 
 template<typename ConsoleMutex>
-SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color(level::level_enum color_level, const std::string &color)
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color(level::level_enum color_level, string_view_t color)
 {
     std::lock_guard<mutex_t> lock(mutex_);
     colors_[color_level] = color;
@@ -107,9 +107,9 @@ SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color_mode(color_mode mode)
 }
 
 template<typename ConsoleMutex>
-SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_ccode_(const std::string &color_code)
+SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::print_ccode_(const string_view_t &color_code)
 {
-    fwrite(color_code.data(), sizeof(char), color_code.size(), target_file_);
+    fwrite(color_code.data(), sizeof(string_view_t::char_type), color_code.size(), target_file_);
 }
 
 template<typename ConsoleMutex>

include/spdlog/sinks/ansicolor_sink.h

@@ -20,6 +20,7 @@ namespace sinks {
  * of the message.
  * If no color terminal detected, omit the escape codes.
  */
+
 template<typename ConsoleMutex>
 class ansicolor_sink : public sink
 {
@@ -30,50 +31,57 @@ public:
 
     ansicolor_sink(const ansicolor_sink &other) = delete;
     ansicolor_sink &operator=(const ansicolor_sink &other) = delete;
-    void set_color(level::level_enum color_level, const std::string &color);
+    void set_color(level::level_enum color_level, string_view_t color);
+    void set_color_mode(color_mode mode);
+    bool should_color();
+
     void log(const details::log_msg &msg) override;
     void flush() override;
     void set_pattern(const std::string &pattern) final;
     void set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) override;
-    bool should_color();
-    void set_color_mode(color_mode mode);
 
-    /// Formatting codes
-    const std::string reset = "\033[m";
-    const std::string bold = "\033[1m";
-    const std::string dark = "\033[2m";
-    const std::string underline = "\033[4m";
-    const std::string blink = "\033[5m";
-    const std::string reverse = "\033[7m";
-    const std::string concealed = "\033[8m";
-    const std::string clear_line = "\033[K";
+
+    // Formatting codes
+    const string_view_t reset = "\033[m";
+    const string_view_t bold = "\033[1m";
+    const string_view_t dark = "\033[2m";
+    const string_view_t underline = "\033[4m";
+    const string_view_t blink = "\033[5m";
+    const string_view_t reverse = "\033[7m";
+    const string_view_t concealed = "\033[8m";
+    const string_view_t clear_line = "\033[K";
 
     // Foreground colors
-    const std::string black = "\033[30m";
-    const std::string red = "\033[31m";
-    const std::string green = "\033[32m";
-    const std::string yellow = "\033[33m";
-    const std::string blue = "\033[34m";
-    const std::string magenta = "\033[35m";
-    const std::string cyan = "\033[36m";
-    const std::string white = "\033[37m";
+    const string_view_t black = "\033[30m";
+    const string_view_t red = "\033[31m";
+    const string_view_t green = "\033[32m";
+    const string_view_t yellow = "\033[33m";
+    const string_view_t blue = "\033[34m";
+    const string_view_t magenta = "\033[35m";
+    const string_view_t cyan = "\033[36m";
+    const string_view_t white = "\033[37m";
 
     /// Background colors
-    const std::string on_black = "\033[40m";
-    const std::string on_red = "\033[41m";
-    const std::string on_green = "\033[42m";
-    const std::string on_yellow = "\033[43m";
-    const std::string on_blue = "\033[44m";
-    const std::string on_magenta = "\033[45m";
-    const std::string on_cyan = "\033[46m";
-    const std::string on_white = "\033[47m";
+    const string_view_t on_black = "\033[40m";
+    const string_view_t on_red = "\033[41m";
+    const string_view_t on_green = "\033[42m";
+    const string_view_t on_yellow = "\033[43m";
+    const string_view_t on_blue = "\033[44m";
+    const string_view_t on_magenta = "\033[45m";
+    const string_view_t on_cyan = "\033[46m";
+    const string_view_t on_white = "\033[47m";
+
+    /// Bold colors
+    const string_view_t yellow_bold = "\033[33m\033[1m";
+    const string_view_t red_bold = "\033[31m\033[1m";
+    const string_view_t bold_on_red = "\033[1m\033[31m";
 
 private:
     FILE *target_file_;
     mutex_t &mutex_;
     bool should_do_colors_;
-    std::unordered_map<level::level_enum, std::string, level::level_hasher> colors_;
-    void print_ccode_(const std::string &color_code);
+    std::unordered_map<level::level_enum, string_view_t, level::level_hasher> colors_;
+    void print_ccode_(const string_view_t&color_code);
     void print_range_(const fmt::memory_buffer &formatted, size_t start, size_t end);
 };