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// This source code is released into the public domain.
module nihil.config;
import nihil.std;
import nihil.core;
namespace nihil::config {
store::store() = default;
auto store::get() -> store &
{
static auto instance = store();
return instance;
}
auto store::register_option(this store &self, option *object)
-> std::expected<void, error>
{
auto [it, okay] = self.m_options.insert(
std::pair{object->name(), object});
if (okay)
return {};
return std::unexpected(error(std::format(
"attempt to register duplicate "
"configuration option '{0}'",
object->name())));
}
auto store::unregister_option(this store &self, option *object)
-> std::expected<void, error>
{
auto it = self.m_options.find(object->name());
if (it == self.m_options.end())
return std::unexpected(error(std::format(
"attempt to unregister non-existent "
"configuration option '{}'",
object->name())));
self.m_options.erase(it);
return {};
}
auto store::fetch(this store const &self, std::string_view name)
-> std::expected<option const *, error>
{
if (auto it = self.m_options.find(name); it != self.m_options.end())
return it->second;
return std::unexpected(error(std::format(
"unknown configuration option '{}'",
name)));
}
auto store::fetch(this store &self, std::string_view name)
-> std::expected<option *, error>
{
auto opt = co_await static_cast<store const &>(self).fetch(name);
co_return const_cast<option *>(opt);
}
auto store::all(this store const &self) -> nihil::generator<option const *>
{
for (auto &&it : self.m_options)
co_yield it.second;
}
auto store::all(this store &self) -> nihil::generator<option *>
{
for (auto &&it : self.m_options)
co_yield it.second;
}
auto get_option(std::string_view option_name)
-> std::expected<option *, error>
{
co_return co_await store::get().fetch(option_name);
}
} // namespace nihil::config
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