From 6a0c5c178db3c9f4f5ad08c4a1805bc9106a07f8 Mon Sep 17 00:00:00 2001
From: Hartmut Seichter <hartmut@gmail.com>
Date: Mon, 22 Jul 2024 22:40:38 +0200
Subject: [PATCH] formatters for std::format and std::print

---
 src/core/include/pw/core/formatter.hpp | 69 ++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 src/core/include/pw/core/formatter.hpp

diff --git a/src/core/include/pw/core/formatter.hpp b/src/core/include/pw/core/formatter.hpp
new file mode 100644
index 0000000..04be12b
--- /dev/null
+++ b/src/core/include/pw/core/formatter.hpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 1999-2021 Hartmut Seichter
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef PW_CORE_FORMATTER_HPP
+#define PW_CORE_FORMATTER_HPP
+
+#include <pw/core/globals.hpp>
+#include <pw/core/matrix.hpp>
+#include <pw/core/vector.hpp>
+
+#include <format>
+#include <numeric>
+#include <string>
+
+template <typename Scalar, std::size_t N>
+struct std::formatter<pw::vector<Scalar, N>> {
+
+    constexpr auto parse(std::format_parse_context& ctx) { return ctx.begin(); }
+
+    constexpr auto format(const pw::vector<Scalar, N>& v,
+                          std::format_context& ctx) const noexcept {
+        return std::format_to(
+            ctx.out(), "{}",
+            std::accumulate(std::next(std::begin(v)), std::end(v),
+                            std::to_string(v[0]),
+                            [](const auto& prev, const auto& e) {
+            return prev + " " + std::to_string(e);
+        }));
+    }
+};
+
+template <typename Scalar, std::size_t Rows, std::size_t Cols>
+struct std::formatter<pw::matrix<Scalar, Rows, Cols>> {
+
+    constexpr auto parse(std::format_parse_context& ctx) { return ctx.begin(); }
+
+    constexpr auto format(const pw::matrix<Scalar, Rows, Cols>& m,
+                          std::format_context& ctx) const noexcept {
+        return std::format_to(
+            ctx.out(), "{}",
+            std::accumulate(std::next(std::begin(m)), std::end(m),
+                            std::format("{}", m[0]),
+                            [](const auto& prev, const auto& e) {
+            return prev + "\n" + std::format("{}", e);
+        }));
+    }
+};
+
+#endif