nix --help: Show usage examples
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1b0088ebb2
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@ -5,6 +5,21 @@ namespace nix {
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Commands * RegisterCommand::commands = 0;
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void Command::printHelp(const string & programName, std::ostream & out)
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{
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Args::printHelp(programName, out);
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auto exs = examples();
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if (!exs.empty()) {
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out << "\n";
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out << "Examples:\n";
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for (auto & ex : exs)
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out << "\n"
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<< " " << ex.description << "\n" // FIXME: wrap
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<< " $ " << ex.command << "\n";
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}
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}
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MultiCommand::MultiCommand(const Commands & _commands)
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: commands(_commands)
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{
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@ -11,6 +11,18 @@ struct Command : virtual Args
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virtual std::string name() = 0;
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virtual void prepare() { };
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virtual void run() = 0;
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struct Example
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{
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std::string description;
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std::string command;
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};
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typedef std::list<Example> Examples;
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virtual Examples examples() { return Examples(); }
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void printHelp(const string & programName, std::ostream & out) override;
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};
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class Store;
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@ -36,6 +36,20 @@ struct CmdVerify : StorePathsCommand
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return "verify the integrity of store paths";
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}
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Examples examples() override
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{
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return {
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Example{
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"To verify the entire Nix store:",
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"nix verify --all"
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},
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Example{
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"To check whether each path in the closure of Firefox has at least 2 signatures:",
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"nix verify -r -n2 --no-contents $(type -p firefox)"
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},
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};
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}
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void run(ref<Store> store, Paths storePaths) override
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{
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restoreAffinity(); // FIXME
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