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/*
* This source code is released into the public domain.
*/
module;
#include <coroutine>
#include <expected>
#include <filesystem>
#include <format>
#include <iterator>
#include <string>
import nihil;
import nihil.ucl;
module nihil.config;
namespace nihil::config {
auto read_from(std::filesystem::path const &filename)
-> std::expected<void, nihil::error>
{
// TODO: nihil.ucl should have a way to load UCL from a filename.
std::string config_text;
auto err = read_file(filename, std::back_inserter(config_text));
if (!err) {
// Ignore ENOENT, it simply means we haven't created the
// config file yet, so default values will be used.
if (err.error().root_cause() == std::errc::no_such_file_or_directory)
return {};
auto errstr = std::format("cannot read {}", filename.string());
return std::unexpected(nihil::error(errstr, err.error()));
}
// Parse the UCL.
try {
auto uclconfig = ucl::parse(config_text);
for (auto &&[key, value] : uclconfig) {
auto &opt = store::get().fetch(key);
opt.from_ucl(value);
}
} catch (unknown_option const &) {
// This is probably an old option which has been removed;
// ignore it, and we'll remove the bad option next time
// we write the config.
} catch (error const &err) {
// Include the filename in any other config errors.
throw error(std::format("{}: {}", filename.string(),
err.what()));
} catch (ucl::error const &err) {
throw error(std::format("{}: {}", filename.string(),
err.what()));
}
return {};
}
} // namespace nihil::config
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