add styling trackers

include/spdlog/details/log_msg.h

@@ -6,8 +6,49 @@
 #include <spdlog/common.h>
 #include <string>
 
+
 namespace spdlog {
 namespace details {
+
+#if !defined(_WIN32) && defined(SPDLOG_EXTENDED_STLYING)
+
+#include <vector>
+#include <array>
+
+enum class style_type
+{
+    // reservation for data structures
+    null_style,
+    // font style
+    reset, bold, dark, underline, blink, reverse,
+    // font foreground colors
+    fg_black, fg_red, fg_green, fg_yellow, fg_blue, fg_magenta, fg_cyan, fg_white, fg_default,
+    // font  background colors
+    bg_black, bg_red, bg_green, bg_yellow, bg_blue, bg_magenta, bg_cyan, bg_white, bg_default,
+};
+
+#if !defined(SPDLOG_ANSI_STLYE_COUNT)
+#   define SPDLOG_ANSI_STLYE_COUNT 25
+    using styles_array  = std::array<details::style_type, SPDLOG_ANSI_STLYE_COUNT>;
+    using style_strings = std::array<std::string, SPDLOG_ANSI_STLYE_COUNT>;
+    using style_codes   = std::array<string_view_t, SPDLOG_ANSI_STLYE_COUNT>;
+#endif
+
+// styling info.
+struct styling_info
+{
+    styling_info() = default;
+    styling_info(details::styles_array styles)
+        : styles(styles)
+        , is_start(true)
+    {}
+
+    bool is_start   = false;
+    size_t position = 0;
+    details::styles_array styles{};
+};
+#endif
+
 struct SPDLOG_API log_msg
 {
     log_msg() = default;
@@ -26,6 +67,11 @@ struct SPDLOG_API log_msg
     mutable size_t color_range_start{0};
     mutable size_t color_range_end{0};
 
+#if !defined(_WIN32) && defined(SPDLOG_EXTENDED_STLYING)
+    // for ansi console styling
+    mutable std::vector<styling_info> styling_ranges;
+#endif
+
     source_loc source;
     string_view_t payload;
 };