From c2d0351e6929a7cc6eeae4ff4c4a0cd59890d050 Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Wed, 13 Nov 2019 17:24:51 +0900
Subject: [PATCH] feat: add (ANSI) terminal colorize operators

---
 toml/color.hpp | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 toml/color.hpp

diff --git a/toml/color.hpp b/toml/color.hpp
new file mode 100644
index 0000000..514632b
--- /dev/null
+++ b/toml/color.hpp
@@ -0,0 +1,78 @@
+#ifndef TOML11_COLOR_HPP
+#define TOML11_COLOR_HPP
+#include <ostream>
+#include <cstdint>
+
+namespace toml
+{
+
+// put ANSI escape sequence to ostream
+namespace color_ansi
+{
+namespace detail
+{
+inline int colorize_index()
+{
+    static const int index = std::ios_base::xalloc();
+    return index;
+}
+} // detail
+
+inline std::ostream& colorize(std::ostream& os)
+{
+    // by default, it is zero.
+    os.iword(detail::colorize_index()) = 1;
+    return os;
+}
+inline std::ostream& nocolorize(std::ostream& os)
+{
+    os.iword(detail::colorize_index()) = 0;
+    return os;
+}
+inline std::ostream& reset  (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[00m";} return os;}
+inline std::ostream& bold   (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[01m";} return os;}
+inline std::ostream& grey   (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[30m";} return os;}
+inline std::ostream& red    (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[31m";} return os;}
+inline std::ostream& green  (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[32m";} return os;}
+inline std::ostream& yellow (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[33m";} return os;}
+inline std::ostream& blue   (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[34m";} return os;}
+inline std::ostream& magenta(std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[35m";} return os;}
+inline std::ostream& cyan   (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[36m";} return os;}
+inline std::ostream& white  (std::ostream& os)
+{if(os.iword(detail::colorize_index()) == 1) {os << "\033[37m";} return os;}
+} // color_ansi
+
+// do nothing.
+namespace nocolor
+{
+inline std::ostream& colorize  (std::ostream& os) noexcept {return os;}
+inline std::ostream& nocolorize(std::ostream& os) noexcept {return os;}
+inline std::ostream& reset     (std::ostream& os) noexcept {return os;}
+inline std::ostream& bold      (std::ostream& os) noexcept {return os;}
+inline std::ostream& grey      (std::ostream& os) noexcept {return os;}
+inline std::ostream& red       (std::ostream& os) noexcept {return os;}
+inline std::ostream& green     (std::ostream& os) noexcept {return os;}
+inline std::ostream& yellow    (std::ostream& os) noexcept {return os;}
+inline std::ostream& blue      (std::ostream& os) noexcept {return os;}
+inline std::ostream& magenta   (std::ostream& os) noexcept {return os;}
+inline std::ostream& cyan      (std::ostream& os) noexcept {return os;}
+inline std::ostream& white     (std::ostream& os) noexcept {return os;}
+} // nocolor
+
+#ifdef TOML11_COLORIZE_ERROR_MESSAGE
+namespace color = color_ansi;
+#else
+namespace color = nocolor;
+#endif
+
+} // toml
+#endif// TOML11_COLOR_HPP