From 68aedbf2faf9b0cf22130c30c2ab281927c547be Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sun, 7 Jun 2026 18:48:10 +0300
Subject: [PATCH] Add hash table formatters

---
 libs/util/include/psemek/util/hash_table.hpp | 57 ++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/libs/util/include/psemek/util/hash_table.hpp b/libs/util/include/psemek/util/hash_table.hpp
index f5989f0f..ae0d1acc 100644
--- a/libs/util/include/psemek/util/hash_table.hpp
+++ b/libs/util/include/psemek/util/hash_table.hpp
@@ -6,6 +6,7 @@
 
 #include <memory>
 #include <initializer_list>
+#include <format>
 
 namespace psemek::util
 {
@@ -716,3 +717,59 @@ namespace psemek::util
 	};
 
 }
+
+
+namespace std
+{
+
+	template <typename T, typename Hash, typename Equal, typename Char>
+	struct formatter<::psemek::util::hash_set<T, Hash, Equal>, Char>
+		: std::formatter<T, Char>
+	{
+		using std::formatter<T, Char>::parse;
+
+		template <typename FormatContext>
+		auto format(::psemek::util::hash_set<T, Hash, Equal> const & s, FormatContext & ctx) const
+		{
+			bool first = true;
+			ctx.advance_to(std::format_to(ctx.out(), "{{"));
+			for (auto const & v : s)
+			{
+				if (!first)
+					ctx.advance_to(std::format_to(ctx.out(), ", "));
+				first = false;
+				ctx.advance_to(formatter<T, Char>::format(v, ctx));
+			}
+			return std::format_to(ctx.out(), "}}");
+		}
+	};
+
+	template <typename Key, typename Value, typename KeyHash, typename KeyEqual, typename Char>
+	struct formatter<::psemek::util::hash_map<Key, Value, KeyHash, KeyEqual>, Char>
+		: std::pair<formatter<Key, Char>, formatter<Value, Char>>
+	{
+		template <typename ParseContext>
+		constexpr auto parse(ParseContext & ctx)
+		{
+			return std::pair<formatter<Key, Char>, formatter<Value, Char>>::first.parse(ctx);
+		}
+
+		template <typename FormatContext>
+		auto format(::psemek::util::hash_map<Key, Value, KeyHash, KeyEqual> const & m, FormatContext & ctx) const
+		{
+			bool first = true;
+			ctx.advance_to(std::format_to(ctx.out(), "{{"));
+			for (auto const & p : m)
+			{
+				if (!first)
+					ctx.advance_to(std::format_to(ctx.out(), ", "));
+				first = false;
+				ctx.advance_to(std::pair<formatter<Key, Char>, formatter<Value, Char>>::first.format(p.first, ctx));
+				ctx.advance_to(std::format_to(ctx.out(), ": "));
+				ctx.advance_to(std::pair<formatter<Key, Char>, formatter<Value, Char>>::second.format(p.second, ctx));
+			}
+			return std::format_to(ctx.out(), "}}");
+		}
+	};
+
+}