nixos/nixos-option: Convert --all into -r
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@ -14,12 +14,16 @@
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nixos-option</command>
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<arg>
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<option>-I</option> <replaceable>path</replaceable>
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<group choice='req'>
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<arg choice='plain'><option>-r</option></arg>
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<arg choice='plain'><option>--recursive</option></arg>
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</group>
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</arg>
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<arg>
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<option>--all</option>
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<option>-I</option> <replaceable>path</replaceable>
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</arg>
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<arg>
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@ -45,6 +49,15 @@
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This command accepts the following options:
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</para>
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<variablelist>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--recursive</option></term>
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<listitem>
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<para>
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Print all the values at or below the specified path recursively.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-I</option> <replaceable>path</replaceable>
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@ -56,16 +69,6 @@
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>--all</option>
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</term>
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<listitem>
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<para>
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Print the values of all options.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection>
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@ -52,7 +52,7 @@
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<listitem>
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<para>
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<command>nixos-option</command> has been rewritten in C++, speeding it up, improving correctness,
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and adding a <option>--all</option> option which prints all options and their values.
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and adding a <option>-r</option> option which prints all options and their values recursively.
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</para>
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</listitem>
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</itemizedlist>
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@ -290,9 +290,14 @@ FindAlongOptionPathRet findAlongOptionPath(Context & ctx, const std::string & pa
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return {v, processedPath};
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}
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// Calls f on all the option names
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void mapOptions(const std::function<void(const std::string & path)> & f, Context & ctx, Value root)
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// Calls f on all the option names at or below the option described by `path`.
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// Note that "the option described by `path`" is not trivial -- if path describes a value inside an aggregate
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// option (such as users.users.root), the *option* described by that path is one path component shorter
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// (eg: users.users), which results in f being called on sibling-paths (eg: users.users.nixbld1). If f
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// doesn't want these, it must do its own filtering.
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void mapOptions(const std::function<void(const std::string & path)> & f, Context & ctx, const std::string & path)
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{
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auto root = findAlongOptionPath(ctx, path);
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recurse(
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[f, &ctx](const std::string & path, std::variant<Value, std::exception_ptr> v) {
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bool isOpt = std::holds_alternative<std::exception_ptr>(v) || isOption(ctx, std::get<Value>(v));
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@ -301,7 +306,7 @@ void mapOptions(const std::function<void(const std::string & path)> & f, Context
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}
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return !isOpt;
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},
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ctx, root, "");
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ctx, root.option, root.path);
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}
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// Calls f on all the config values inside one option.
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@ -475,17 +480,26 @@ void printConfigValue(Context & ctx, Out & out, const std::string & path, std::v
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out << ";\n";
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}
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void printAll(Context & ctx, Out & out)
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// Replace with std::starts_with when C++20 is available
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bool starts_with(const std::string & s, const std::string & prefix)
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{
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return s.size() >= prefix.size() &&
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std::equal(s.begin(), std::next(s.begin(), prefix.size()), prefix.begin(), prefix.end());
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}
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void printRecursive(Context & ctx, Out & out, const std::string & path)
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{
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mapOptions(
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[&ctx, &out](const std::string & optionPath) {
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[&ctx, &out, &path](const std::string & optionPath) {
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mapConfigValuesInOption(
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[&ctx, &out](const std::string & configPath, std::variant<Value, std::exception_ptr> v) {
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printConfigValue(ctx, out, configPath, v);
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[&ctx, &out, &path](const std::string & configPath, std::variant<Value, std::exception_ptr> v) {
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if (starts_with(configPath, path)) {
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printConfigValue(ctx, out, configPath, v);
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}
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},
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optionPath, ctx);
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},
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ctx, ctx.optionsRoot);
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ctx, path);
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}
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void printAttr(Context & ctx, Out & out, const std::string & path, Value & root)
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@ -569,7 +583,7 @@ void printOne(Context & ctx, Out & out, const std::string & path)
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int main(int argc, char ** argv)
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{
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bool all = false;
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bool recursive = false;
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std::string path = ".";
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std::string optionsExpr = "(import <nixpkgs/nixos> {}).options";
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std::string configExpr = "(import <nixpkgs/nixos> {}).config";
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@ -585,8 +599,8 @@ int main(int argc, char ** argv)
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nix::showManPage("nixos-option");
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} else if (*arg == "--version") {
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nix::printVersion("nixos-option");
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} else if (*arg == "--all") {
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all = true;
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} else if (*arg == "-r" || *arg == "--recursive") {
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recursive = true;
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} else if (*arg == "--path") {
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path = nix::getArg(*arg, arg, end);
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} else if (*arg == "--options_expr") {
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@ -615,18 +629,12 @@ int main(int argc, char ** argv)
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Context ctx{*state, *myArgs.getAutoArgs(*state), optionsRoot, configRoot};
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Out out(std::cout);
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if (all) {
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if (!args.empty()) {
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throw UsageError("--all cannot be used with arguments");
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}
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printAll(ctx, out);
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} else {
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if (args.empty()) {
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printOne(ctx, out, "");
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}
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for (const auto & arg : args) {
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printOne(ctx, out, arg);
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}
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auto print = recursive ? printRecursive : printOne;
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if (args.empty()) {
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print(ctx, out, "");
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}
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for (const auto & arg : args) {
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print(ctx, out, arg);
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}
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ctx.state.printStats();
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