nix: Make all options available as flags

Thus, instead of ‘--option <name> <value>’, you can write ‘--<name>
<value>’. So

  --option http-connections 100

becomes

  --http-connections 100

Apart from brevity, the difference is that it's not an error to set a
non-existent option via --option, but unrecognized arguments are
fatal.

Boolean options have special treatment: they're mapped to the
argument-less flags ‘--<name>’ and ‘--no-<name>’. E.g.

  --option auto-optimise-store false

becomes

  --no-auto-optimise-store
This commit is contained in:
Eelco Dolstra 2017-06-07 16:17:17 +02:00
parent c8cc50d46e
commit b8283773bd
No known key found for this signature in database
GPG key ID: 8170B4726D7198DE
4 changed files with 40 additions and 0 deletions

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@ -98,6 +98,13 @@ template<> void BaseSetting<SandboxMode>::toJSON(JSONPlaceholder & out)
AbstractSetting::toJSON(out);
}
template<> void BaseSetting<SandboxMode>::convertToArg(Args & args)
{
args.mkFlag(0, name, {}, "Enable sandboxing.", 0, [=](Strings ss) { value = smEnabled; });
args.mkFlag(0, "no-" + name, {}, "Disable sandboxing.", 0, [=](Strings ss) { value = smDisabled; });
args.mkFlag(0, "relaxed-" + name, {}, "Enable sandboxing, but allow builds to disable it.", 0, [=](Strings ss) { value = smRelaxed; });
}
void MaxBuildJobsSetting::set(const std::string & str)
{
if (str == "auto") value = std::max(1U, std::thread::hardware_concurrency());

View file

@ -115,6 +115,13 @@ void Config::toJSON(JSONObject & out)
}
}
void Config::convertToArgs(Args & args)
{
for (auto & s : _settings)
if (!s.second.isAlias)
s.second.setting->convertToArg(args);
}
AbstractSetting::AbstractSetting(
const std::string & name,
const std::string & description,
@ -128,12 +135,22 @@ void AbstractSetting::toJSON(JSONPlaceholder & out)
out.write(to_string());
}
void AbstractSetting::convertToArg(Args & args)
{
}
template<typename T>
void BaseSetting<T>::toJSON(JSONPlaceholder & out)
{
out.write(value);
}
template<typename T>
void BaseSetting<T>::convertToArg(Args & args)
{
args.mkFlag(0, name, {}, description, 1, [=](Strings ss) { set(*ss.begin()); });
}
template<> void BaseSetting<std::string>::set(const std::string & str)
{
value = str;
@ -174,6 +191,12 @@ template<> std::string BaseSetting<bool>::to_string()
return value ? "true" : "false";
}
template<> void BaseSetting<bool>::convertToArg(Args & args)
{
args.mkFlag(0, name, {}, description, 0, [=](Strings ss) { value = true; });
args.mkFlag(0, "no-" + name, {}, description, 0, [=](Strings ss) { value = false; });
}
template<> void BaseSetting<Strings>::set(const std::string & str)
{
value = tokenizeString<Strings>(str);
@ -216,6 +239,8 @@ template class BaseSetting<long long>;
template class BaseSetting<unsigned long long>;
template class BaseSetting<bool>;
template class BaseSetting<std::string>;
template class BaseSetting<Strings>;
template class BaseSetting<StringSet>;
void PathSetting::set(const std::string & str)
{

View file

@ -63,6 +63,8 @@ public:
void resetOverriden();
void toJSON(JSONObject & out);
void convertToArgs(Args & args);
};
class AbstractSetting
@ -99,6 +101,8 @@ protected:
virtual void toJSON(JSONPlaceholder & out);
virtual void convertToArg(Args & args);
bool isOverriden() { return overriden; }
};
@ -132,6 +136,8 @@ public:
std::string to_string() override;
void convertToArg(Args & args) override;
void toJSON(JSONPlaceholder & out) override;
};

View file

@ -22,6 +22,8 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
});
mkFlag(0, "version", "show version information", std::bind(printVersion, programName));
settings.convertToArgs(*this);
}
};