forked from lix-project/lix
131 lines
3.2 KiB
C++
131 lines
3.2 KiB
C++
#include "config.hh"
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#include "args.hh"
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namespace nix {
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void Config::set(const std::string & name, const std::string & value)
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{
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auto i = _settings.find(name);
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if (i == _settings.end())
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throw UsageError("unknown setting '%s'", name);
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i->second.setting->set(value);
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}
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void Config::add(AbstractSetting * setting)
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{
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_settings.emplace(setting->name, Config::SettingData{false, setting});
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for (auto & alias : setting->aliases)
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_settings.emplace(alias, Config::SettingData{true, setting});
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bool set = false;
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auto i = initials.find(setting->name);
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if (i != initials.end()) {
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setting->set(i->second);
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initials.erase(i);
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set = true;
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}
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for (auto & alias : setting->aliases) {
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auto i = initials.find(alias);
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if (i != initials.end()) {
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if (set)
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warn("setting '%s' is set, but it's an alias of '%s' which is also set",
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alias, setting->name);
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else {
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setting->set(i->second);
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initials.erase(i);
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set = true;
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}
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}
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}
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}
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void Config::warnUnused()
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{
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for (auto & i : initials)
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warn("unknown setting '%s'", i.first);
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}
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std::string Config::dump()
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{
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std::string res;
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for (auto & opt : _settings)
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if (!opt.second.isAlias)
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res += opt.first + " = " + opt.second.setting->to_string() + "\n";
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return res;
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}
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AbstractSetting::AbstractSetting(
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const std::string & name,
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const std::string & description,
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const std::set<std::string> & aliases)
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: name(name), description(description), aliases(aliases)
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{
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}
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template<> void Setting<std::string>::set(const std::string & str)
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{
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value = str;
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}
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template<> std::string Setting<std::string>::to_string()
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{
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return value;
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}
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template<typename T>
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void Setting<T>::set(const std::string & str)
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{
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static_assert(std::is_integral<T>::value, "Integer required.");
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try {
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auto i = std::stoll(str);
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if (i < std::numeric_limits<T>::min() ||
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i > std::numeric_limits<T>::max())
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throw UsageError("setting '%s' has out-of-range value %d", name, i);
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value = i;
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} catch (std::logic_error&) {
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throw UsageError("setting '%s' has invalid value '%s'", name, str);
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}
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}
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template<typename T>
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std::string Setting<T>::to_string()
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{
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static_assert(std::is_integral<T>::value, "Integer required.");
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return std::to_string(value);
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}
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template<> void Setting<bool>::set(const std::string & str)
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{
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if (str == "true" || str == "yes" || str == "1")
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value = true;
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else if (str == "false" || str == "no" || str == "0")
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value = false;
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else
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throw UsageError("Boolean setting '%s' has invalid value '%s'", name, str);
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}
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template<> std::string Setting<bool>::to_string()
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{
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return value ? "true" : "false";
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}
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template class Setting<int>;
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template class Setting<unsigned int>;
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template class Setting<long>;
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template class Setting<size_t>;
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void PathSetting::set(const std::string & str)
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{
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if (str == "") {
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if (allowEmpty)
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value = "";
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else
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throw UsageError("setting '%s' cannot be empty", name);
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} else
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value = canonPath(str);
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}
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}
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