From 2a3f19ff67bd0292a2812993b2b19c292d113959 Mon Sep 17 00:00:00 2001 From: Lexi Winter Date: Mon, 23 Jun 2025 19:45:54 +0100 Subject: config: add separate implementation for read, write --- nihil.config/read.cc | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 nihil.config/read.cc (limited to 'nihil.config/read.cc') diff --git a/nihil.config/read.cc b/nihil.config/read.cc new file mode 100644 index 0000000..d55703d --- /dev/null +++ b/nihil.config/read.cc @@ -0,0 +1,57 @@ +/* + * This source code is released into the public domain. + */ + +module; + +#include +#include +#include +#include + +import nihil; +import nihil.ucl; + +module nihil.config; + +namespace nihil::config { + +auto read_from(std::filesystem::path const &filename) -> void +{ + // 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() == std::errc::no_such_file_or_directory) + return; + throw error(std::format("{}: {}", + filename.string(), + err.error().message())); + } + + // 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())); + } +} + +} // namespace nihil::config -- cgit v1.2.3