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#pragma once
#include "args.hh"
#include "common-eval-args.hh"
namespace nix {
extern std::string programPath;
struct Value;
class Bindings;
class EvalState;
struct Pos;
class Store;
/* A command that requires a Nix store. */
struct StoreCommand : virtual Command
{
StoreCommand();
void run() override;
ref<Store> getStore();
virtual ref<Store> createStore();
virtual void run(ref<Store>) = 0;
private:
std::shared_ptr<Store> _store;
};
struct Buildable
{
Path drvPath; // may be empty
std::map<std::string, Path> outputs;
};
typedef std::vector<Buildable> Buildables;
struct Installable
{
virtual ~Installable() { }
virtual std::string what() = 0;
virtual Buildables toBuildables()
{
throw Error("argument '%s' cannot be built", what());
}
Buildable toBuildable();
virtual Value * toValue(EvalState & state)
{
throw Error("argument '%s' cannot be evaluated", what());
}
};
struct SourceExprCommand : virtual Args, StoreCommand, MixEvalArgs
{
Path file;
SourceExprCommand();
/* Return a value representing the Nix expression from which we
are installing. This is either the file specified by ‘--file’,
or an attribute set constructed from $NIX_PATH, e.g. ‘{ nixpkgs
= import ...; bla = import ...; }’. */
Value * getSourceExpr(EvalState & state);
ref<EvalState> getEvalState();
private:
std::shared_ptr<EvalState> evalState;
Value * vSourceExpr = 0;
};
enum RealiseMode { Build, NoBuild, DryRun };
/* A command that operates on a list of "installables", which can be
store paths, attribute paths, Nix expressions, etc. */
struct InstallablesCommand : virtual Args, SourceExprCommand
{
std::vector<std::shared_ptr<Installable>> installables;
InstallablesCommand()
{
expectArgs("installables", &_installables);
}
void prepare() override;
virtual bool useDefaultInstallables() { return true; }
private:
std::vector<std::string> _installables;
};
/* A command that operates on exactly one "installable" */
struct InstallableCommand : virtual Args, SourceExprCommand
{
std::shared_ptr<Installable> installable;
InstallableCommand()
{
expectArg("installable", &_installable);
}
void prepare() override;
private:
std::string _installable;
};
/* A command that operates on zero or more store paths. */
struct StorePathsCommand : public InstallablesCommand
{
private:
bool recursive = false;
bool all = false;
protected:
RealiseMode realiseMode = NoBuild;
public:
StorePathsCommand(bool recursive = false);
using StoreCommand::run;
virtual void run(ref<Store> store, Paths storePaths) = 0;
void run(ref<Store> store) override;
bool useDefaultInstallables() override { return !all; }
};
/* A command that operates on exactly one store path. */
struct StorePathCommand : public InstallablesCommand
{
using StoreCommand::run;
virtual void run(ref<Store> store, const Path & storePath) = 0;
void run(ref<Store> store) override;
};
/* A helper class for registering commands globally. */
struct RegisterCommand
{
static Commands * commands;
RegisterCommand(const std::string & name,
std::function<ref<Command>()> command)
{
if (!commands) commands = new Commands;
commands->emplace(name, command);
}
};
template<class T>
static RegisterCommand registerCommand(const std::string & name)
{
return RegisterCommand(name, [](){ return make_ref<T>(); });
}
std::shared_ptr<Installable> parseInstallable(
SourceExprCommand & cmd, ref<Store> store, const std::string & installable,
bool useDefaultInstallables);
Buildables build(ref<Store> store, RealiseMode mode,
std::vector<std::shared_ptr<Installable>> installables);
PathSet toStorePaths(ref<Store> store, RealiseMode mode,
std::vector<std::shared_ptr<Installable>> installables);
Path toStorePath(ref<Store> store, RealiseMode mode,
std::shared_ptr<Installable> installable);
PathSet toDerivations(ref<Store> store,
std::vector<std::shared_ptr<Installable>> installables,
bool useDeriver = false);
/* Helper function to generate args that invoke $EDITOR on
filename:lineno. */
Strings editorFor(const Pos & pos);
}
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