forked from lix-project/lix
2040240e23
The typical use is to inherit Config and add Setting<T> members:
class MyClass : private Config
{
Setting<int> foo{this, 123, "foo", "the number of foos to use"};
Setting<std::string> bar{this, "blabla", "bar", "the name of the bar"};
MyClass() : Config(readConfigFile("/etc/my-app.conf"))
{
std::cout << foo << "\n"; // will print 123 unless overriden
}
};
Currently, this is used by Store and its subclasses for store
parameters. You now get a warning if you specify a non-existant store
parameter in a store URI.
113 lines
2.5 KiB
C++
113 lines
2.5 KiB
C++
#include "config.hh"
|
|
#include "args.hh"
|
|
|
|
namespace nix {
|
|
|
|
void Config::set(const std::string & name, const std::string & value)
|
|
{
|
|
auto i = _settings.find(name);
|
|
if (i == _settings.end())
|
|
throw UsageError("unknown setting '%s'", name);
|
|
i->second.setting->set(value);
|
|
}
|
|
|
|
void Config::add(AbstractSetting * setting)
|
|
{
|
|
_settings.emplace(setting->name, Config::SettingData{false, setting});
|
|
for (auto & alias : setting->aliases)
|
|
_settings.emplace(alias, Config::SettingData{true, setting});
|
|
|
|
bool set = false;
|
|
|
|
auto i = initials.find(setting->name);
|
|
if (i != initials.end()) {
|
|
setting->set(i->second);
|
|
initials.erase(i);
|
|
set = true;
|
|
}
|
|
|
|
for (auto & alias : setting->aliases) {
|
|
auto i = initials.find(alias);
|
|
if (i != initials.end()) {
|
|
if (set)
|
|
warn("setting '%s' is set, but it's an alias of '%s' which is also set",
|
|
alias, setting->name);
|
|
else {
|
|
setting->set(i->second);
|
|
initials.erase(i);
|
|
set = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Config::warnUnused()
|
|
{
|
|
for (auto & i : initials)
|
|
warn("unknown setting '%s'", i.first);
|
|
}
|
|
|
|
std::string Config::dump()
|
|
{
|
|
std::string res;
|
|
for (auto & opt : _settings)
|
|
if (!opt.second.isAlias)
|
|
res += opt.first + " = " + opt.second.setting->to_string() + "\n";
|
|
return res;
|
|
}
|
|
|
|
AbstractSetting::AbstractSetting(
|
|
const std::string & name,
|
|
const std::string & description,
|
|
const std::set<std::string> & aliases)
|
|
: name(name), description(description), aliases(aliases)
|
|
{
|
|
}
|
|
|
|
template<> void Setting<std::string>::set(const std::string & str)
|
|
{
|
|
value = str;
|
|
}
|
|
|
|
template<> std::string Setting<std::string>::to_string()
|
|
{
|
|
return value;
|
|
}
|
|
|
|
template<> void Setting<int>::set(const std::string & str)
|
|
{
|
|
try {
|
|
value = std::stoi(str);
|
|
} catch (...) {
|
|
throw UsageError("setting '%s' has invalid value '%s'", name, str);
|
|
}
|
|
}
|
|
|
|
template<> std::string Setting<int>::to_string()
|
|
{
|
|
return std::to_string(value);
|
|
}
|
|
|
|
template<> void Setting<bool>::set(const std::string & str)
|
|
{
|
|
value = str == "true" || str == "1";
|
|
}
|
|
|
|
template<> std::string Setting<bool>::to_string()
|
|
{
|
|
return value ? "true" : "false";
|
|
}
|
|
|
|
void PathSetting::set(const std::string & str)
|
|
{
|
|
if (str == "") {
|
|
if (allowEmpty)
|
|
value = "";
|
|
else
|
|
throw UsageError("setting '%s' cannot be empty", name);
|
|
} else
|
|
value = canonPath(str);
|
|
}
|
|
|
|
}
|