Break out formatters

In the change made to move to std::format, we defined some custom type
formatters in logging.hpp.  This had the unintended effect of making
all compile units pull in the majority of boost::url, and nlohmann::json
as includes.

This commit breaks out boost and json formatters into their own separate
includes.

Tested: Code compiles.  Logging changes only.

Change-Id: I6a788533169f10e19130a1910cd3be0cc729b020
Signed-off-by: Ed Tanous <ed@tanous.net>

1 files changed, 39 insertions, 0 deletions

diff --git a/include/json_formatters.hpp b/include/json_formatters.hpp
new file mode 100644
index 0000000000..ae72a083c9
--- /dev/null
+++ b/include/json_formatters.hpp
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <nlohmann/json.hpp>
+
+#include <format>
+
+// Clang-tidy would rather these be static, but using static causes the template
+// specialization to not function.  Ignore the warning.
+// NOLINTBEGIN(readability-convert-member-functions-to-static, cert-dcl58-cpp)
+
+template <>
+struct std::formatter<nlohmann::json::json_pointer>
+{
+    constexpr auto parse(std::format_parse_context& ctx)
+    {
+        return ctx.begin();
+    }
+    auto format(const nlohmann::json::json_pointer& ptr, auto& ctx) const
+    {
+        return std::format_to(ctx.out(), "{}", ptr.to_string());
+    }
+};
+
+template <>
+struct std::formatter<nlohmann::json>
+{
+    static constexpr auto parse(std::format_parse_context& ctx)
+    {
+        return ctx.begin();
+    }
+    auto format(const nlohmann::json& json, auto& ctx) const
+    {
+        return std::format_to(
+            ctx.out(), "{}",
+            json.dump(-1, ' ', false,
+                      nlohmann::json::error_handler_t::replace));
+    }
+};
+// NOLINTEND(readability-convert-member-functions-to-static, cert-dcl58-cpp)