60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
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#pragma once
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#include "args.hh"
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namespace nix {
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/* A command is an argument parser that can be executed by calling its
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run() method. */
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struct Command : virtual Args
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{
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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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};
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class Store;
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/* A command that require a Nix store. */
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struct StoreCommand : virtual Command
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{
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bool reserveSpace;
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StoreCommand(bool reserveSpace = true)
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: reserveSpace(reserveSpace) { };
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void run() override;
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virtual void run(ref<Store>) = 0;
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};
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typedef std::map<std::string, ref<Command>> Commands;
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/* An argument parser that supports multiple subcommands,
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i.e. ‘<command> <subcommand>’. */
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struct MultiCommand : virtual Args
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{
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Commands commands;
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std::shared_ptr<Command> command;
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MultiCommand(const Commands & commands);
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void printHelp(const string & programName, std::ostream & out) override;
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bool processFlag(Strings::iterator & pos, Strings::iterator end) override;
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bool processArgs(const Strings & args, bool finish) override;
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};
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/* A helper class for registering commands globally. */
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struct RegisterCommand
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{
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static Commands * commands;
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RegisterCommand(ref<Command> command)
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{
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if (!commands) commands = new Commands;
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commands->emplace(command->name(), command);
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}
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};
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}
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