1 files changed, 97 insertions, 0 deletions
diff --git a/nihil.config/option.cc b/nihil.config/option.cc
new file mode 100644
index 0000000..886f4b6
--- /dev/null
+++ b/nihil.config/option.cc
@@ -0,0 +1,97 @@
+/*
+ * This source code is released into the public domain.
+ */
+
+module;
+
+#include <coroutine>
+#include <expected>
+#include <iostream>
+#include <string>
+
+module nihil.config;
+
+import nihil.error;
+import nihil.monad;
+import nihil.ucl;
+
+namespace nihil::config {
+
+//NOLINTNEXTLINE(bugprone-easily-swappable-parameters)
+option::option(std::string_view name, std::string_view description)
+	: m_name(name)
+	, m_description(description)
+{
+	auto okay = store::get().register_option(this);
+	if (okay)
+		return;
+
+	std::print(std::cerr,
+		   "INTERNAL ERROR: failed to register "
+		   "configuration option '{}': {}",
+		   m_name, okay.error());
+	std::exit(1);
+}
+
+option::~option()
+{
+	std::ignore = store::get().unregister_option(this);
+}
+
+auto option::name(this option const &self) noexcept
+	-> std::string_view
+{
+	return self.m_name;
+}
+
+auto option::description(this option const &self) noexcept
+	-> std::string_view
+{
+	return self.m_description;
+}
+
+auto option::is_default(this option const &self) noexcept
+	-> bool
+{
+	return self.m_is_default;
+}
+
+auto option::is_default(this option  &self, bool b) -> void
+{
+	self.m_is_default = b;
+}
+
+auto option::string(this option const &self) -> std::string
+{
+	return self.get_string();
+}
+
+auto option::string(this option &self, std::string_view value)
+	-> std::expected<void, error>
+{
+	co_await self.set_string(value);
+	self.is_default(false);
+	co_return {};
+}
+
+auto option::ucl(this option const &self)
+	-> std::expected<nihil::ucl::object, error>
+{
+	return self.get_ucl();
+}
+
+auto option::ucl(this option &self, nihil::ucl::object const &value)
+	-> std::expected<void, error>
+{
+	co_await self.set_ucl(value);
+	self.is_default(false);
+	co_return {};
+}
+
+auto operator<<(std::ostream &strm, option const &opt)
+-> std::ostream &
+{
+	return strm << "<" << opt.name() << "=" << opt.string() << ">";
+}
+
+} // namespace nihil