config: add separate implementation for read, write

1 files changed, 39 insertions, 0 deletions

diff --git a/nihil.config/write.cc b/nihil.config/write.cc
new file mode 100644
index 0000000..4b2a232
--- /dev/null
+++ b/nihil.config/write.cc
@@ -0,0 +1,39 @@
+/*
+ * This source code is released into the public domain.
+ */
+
+module;
+
+#include <filesystem>
+#include <format>
+#include <utility>
+
+import nihil;
+import nihil.ucl;
+
+module nihil.config;
+
+namespace nihil::config {
+
+auto write_to(std::filesystem::path const &filename) -> void
+try {
+	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;
+
+		uclconfig.insert({option.name(), option.to_ucl()});
+	}
+
+	auto ucl_text = std::format("{:c}", uclconfig);
+	auto ret = safe_write_file(filename, ucl_text);
+	if (!ret)
+		throw error(std::format("{}: {}", filename.string(),
+					ret.error().message()));
+} catch (ucl::error const &exc) {
+	throw error(std::format("{}: {}", filename.string(), exc.what()));
+}
+
+};