From 2e2d1bd3b6c7776b77c33b94f30ead89367a71e6 Mon Sep 17 00:00:00 2001
From: Lexi Winter <lexi@le-fay.org>
Date: Tue, 1 Jul 2025 17:07:04 +0100
Subject: add nihil.std

---
 nihil.config/write.ccm | 42 +++++++++++++++++++++++++++---------------
 1 file changed, 27 insertions(+), 15 deletions(-)

(limited to 'nihil.config/write.ccm')

diff --git a/nihil.config/write.ccm b/nihil.config/write.ccm
index 564bb20..a7eddd5 100644
--- a/nihil.config/write.ccm
+++ b/nihil.config/write.ccm
@@ -1,22 +1,34 @@
-/*
- * This source code is released into the public domain.
- */
-
-module;
-
-#include <expected>
-#include <filesystem>
-
+// This source code is released into the public domain.
 export module nihil.config:write;
 
+import nihil.std;
 import nihil.error;
+import nihil.monad;
+import nihil.posix;
+import nihil.ucl;
+import :option;
+import :store;
 
 namespace nihil::config {
 
-/*
- * Write all config values (except defaults) to disk.
- */
-export [[nodiscard]] auto write_to(std::filesystem::path const &filename) ->
-	std::expected<void, error>;
+// Write all config values (except defaults) to disk.
+export [[nodiscard]] auto
+write_to(std::filesystem::path const &filename) -> std::expected<void, error>
+{
+	auto uclconfig = ucl::map<ucl::object>();
+
+	// Add all the options to the UCL object.
+	for (auto const &option : store::get().all()) {
+		if (option->is_default())
+			continue;
+
+		auto uobj = co_await option->ucl();
+		uclconfig.insert({option->name(), uobj});
+	}
+
+	auto ucl_text = std::format("{:c}", uclconfig);
+	co_await safe_write_file(filename, ucl_text);
+	co_return {};
+}
 
-};
+}; // namespace nihil::config
-- 
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