154 lines
3.5 KiB
C++
154 lines
3.5 KiB
C++
#pragma once
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#include "args.hh"
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namespace nix {
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struct Value;
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class EvalState;
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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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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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/* A command that require a Nix store. */
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struct StoreCommand : virtual Command
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{
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std::string storeUri;
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StoreCommand();
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void run() override;
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ref<Store> getStore();
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virtual ref<Store> createStore();
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virtual void run(ref<Store>) = 0;
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private:
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std::shared_ptr<Store> _store;
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};
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struct Installable
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{
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virtual std::string what() = 0;
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virtual PathSet toBuildable()
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{
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throw Error("argument ‘%s’ cannot be built", what());
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}
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virtual Value * toValue(EvalState & state)
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{
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throw Error("argument ‘%s’ cannot be evaluated", what());
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}
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};
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/* A command that operates on a list of "installables", which can be
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store paths, attribute paths, Nix expressions, etc. */
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struct InstallablesCommand : virtual Args, StoreCommand
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{
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std::vector<std::shared_ptr<Installable>> installables;
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Path file;
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InstallablesCommand()
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{
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mkFlag('f', "file", "file", "evaluate FILE rather than the default", &file);
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expectArgs("installables", &_installables);
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}
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/* Return a value representing the Nix expression from which we
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are installing. This is either the file specified by ‘--file’,
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or an attribute set constructed from $NIX_PATH, e.g. ‘{ nixpkgs
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= import ...; bla = import ...; }’. */
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Value * getSourceExpr(EvalState & state);
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std::vector<std::shared_ptr<Installable>> parseInstallables(ref<Store> store, Strings ss);
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PathSet buildInstallables(ref<Store> store, bool dryRun);
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ref<EvalState> getEvalState();
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void prepare() override;
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virtual bool useDefaultInstallables() { return true; }
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private:
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Strings _installables;
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std::shared_ptr<EvalState> evalState;
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Value * vSourceExpr = 0;
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};
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/* A command that operates on zero or more store paths. */
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struct StorePathsCommand : public InstallablesCommand
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{
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private:
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bool recursive = false;
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bool all = false;
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public:
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StorePathsCommand();
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using StoreCommand::run;
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virtual void run(ref<Store> store, Paths storePaths) = 0;
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void run(ref<Store> store) override;
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bool useDefaultInstallables() override { return !all; }
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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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class MultiCommand : virtual Args
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{
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public:
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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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