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#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::addSetting(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::warnUnknownSettings()
{
for (auto & i : initials)
warn("unknown setting '%s'", i.first);
}
StringMap Config::getSettings()
{
StringMap res;
for (auto & opt : _settings)
if (!opt.second.isAlias)
res.emplace(opt.first, opt.second.setting->to_string());
return res;
}
void Config::applyConfigFile(const Path & path, bool fatal)
{
try {
string contents = readFile(path);
unsigned int pos = 0;
while (pos < contents.size()) {
string line;
while (pos < contents.size() && contents[pos] != '\n')
line += contents[pos++];
pos++;
string::size_type hash = line.find('#');
if (hash != string::npos)
line = string(line, 0, hash);
vector<string> tokens = tokenizeString<vector<string> >(line);
if (tokens.empty()) continue;
if (tokens.size() < 2 || tokens[1] != "=")
throw UsageError("illegal configuration line ‘%1%’ in ‘%2%’", line, path);
string name = tokens[0];
vector<string>::iterator i = tokens.begin();
advance(i, 2);
try {
set(name, concatStringsSep(" ", Strings(i, tokens.end()))); // FIXME: slow
} catch (UsageError & e) {
if (fatal) throw;
warn("in configuration file '%s': %s", path, e.what());
}
};
} catch (SysError &) { }
}
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<typename T, typename Tag>
void Setting<T, Tag>::set(const std::string & str)
{
static_assert(std::is_integral<T>::value, "Integer required.");
if (!string2Int(str, value))
throw UsageError("setting '%s' has invalid value '%s'", name, str);
}
template<typename T, typename Tag>
std::string Setting<T, Tag>::to_string()
{
static_assert(std::is_integral<T>::value, "Integer required.");
return std::to_string(value);
}
bool AbstractSetting::parseBool(const std::string & str)
{
if (str == "true" || str == "yes" || str == "1")
return true;
else if (str == "false" || str == "no" || str == "0")
return false;
else
throw UsageError("Boolean setting '%s' has invalid value '%s'", name, str);
}
template<> void Setting<bool>::set(const std::string & str)
{
value = parseBool(str);
}
std::string AbstractSetting::printBool(bool b)
{
return b ? "true" : "false";
}
template<> std::string Setting<bool>::to_string()
{
return printBool(value);
}
template<> void Setting<Strings>::set(const std::string & str)
{
value = tokenizeString<Strings>(str);
}
template<> std::string Setting<Strings>::to_string()
{
return concatStringsSep(" ", value);
}
template<> void Setting<StringSet>::set(const std::string & str)
{
value = tokenizeString<StringSet>(str);
}
template<> std::string Setting<StringSet>::to_string()
{
return concatStringsSep(" ", value);
}
template class Setting<int>;
template class Setting<unsigned int>;
template class Setting<long>;
template class Setting<size_t>;
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);
}
}
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