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Make subcommand construction in MultiCommand lazy

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(cherry picked from commit a0de58f471)
This commit is contained in:
Eelco Dolstra 2019-06-18 16:01:35 +02:00
parent f964f428fe
commit ac67685606
28 changed files with 61 additions and 201 deletions
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15
src/libutil/args.cc
View file

@ -215,17 +215,15 @@ void Command::printHelp(const string & programName, std::ostream & out)
}
}
MultiCommand::MultiCommand(const std::vector<ref<Command>> & _commands)
MultiCommand::MultiCommand(const Commands & commands)
: commands(commands)
{
for (auto & command : _commands)
commands.emplace(command->name(), command);
expectedArgs.push_back(ExpectedArg{"command", 1, true, [=](std::vector<std::string> ss) {
assert(!command);
auto i = commands.find(ss[0]);
if (i == commands.end())
throw UsageError("'%s' is not a recognised command", ss[0]);
command = i->second;
command = i->second();
}});
}
@ -246,10 +244,11 @@ void MultiCommand::printHelp(const string & programName, std::ostream & out)
out << "Available commands:\n";
Table2 table;
for (auto & command : commands) {
auto descr = command.second->description();
for (auto & i : commands) {
auto command = i.second();
auto descr = command->description();
if (!descr.empty())
table.push_back(std::make_pair(command.second->name(), descr));
table.push_back(std::make_pair(command->name(), descr));
}
printTable(out, table);
}

13
src/libutil/args.hh
View file

@ -192,8 +192,15 @@ public:
run() method. */
struct Command : virtual Args
{
private:
std::string _name;
public:
virtual ~Command() { }
virtual std::string name() = 0;
std::string name() { return _name; }
virtual void prepare() { };
virtual void run() = 0;
@ -210,7 +217,7 @@ struct Command : virtual Args
void printHelp(const string & programName, std::ostream & out) override;
};
typedef std::map<std::string, ref<Command>> Commands;
typedef std::map<std::string, std::function<ref<Command>()>> Commands;
/* An argument parser that supports multiple subcommands,
i.e. ‘<command> <subcommand>’. */
@ -221,7 +228,7 @@ public:
std::shared_ptr<Command> command;
MultiCommand(const std::vector<ref<Command>> & commands);
MultiCommand(const Commands & commands);
void printHelp(const string & programName, std::ostream & out) override;

7
src/nix/add-to-store.cc
View file

@ -22,11 +22,6 @@ struct CmdAddToStore : MixDryRun, StoreCommand
.dest(&namePart);
}
std::string name() override
{
return "add-to-store";
}
std::string description() override
{
return "add a path to the Nix store";
@ -58,4 +53,4 @@ struct CmdAddToStore : MixDryRun, StoreCommand
}
};
static RegisterCommand r1(make_ref<CmdAddToStore>());
static auto r1 = registerCommand<CmdAddToStore>("add-to-store");

7
src/nix/build.cc
View file

@ -24,11 +24,6 @@ struct CmdBuild : MixDryRun, InstallablesCommand
.set(&outLink, Path(""));
}
std::string name() override
{
return "build";
}
std::string description() override
{
return "build a derivation or fetch a store path";
@ -69,4 +64,4 @@ struct CmdBuild : MixDryRun, InstallablesCommand
}
};
static RegisterCommand r1(make_ref<CmdBuild>());
static auto r1 = registerCommand<CmdBuild>("build");

14
src/nix/cat.cc
View file

@ -28,11 +28,6 @@ struct CmdCatStore : StoreCommand, MixCat
expectArg("path", &path);
}
std::string name() override
{
return "cat-store";
}
std::string description() override
{
return "print the contents of a store file on stdout";
@ -54,11 +49,6 @@ struct CmdCatNar : StoreCommand, MixCat
expectArg("path", &path);
}
std::string name() override
{
return "cat-nar";
}
std::string description() override
{
return "print the contents of a file inside a NAR file";
@ -70,5 +60,5 @@ struct CmdCatNar : StoreCommand, MixCat
}
};
static RegisterCommand r1(make_ref<CmdCatStore>());
static RegisterCommand r2(make_ref<CmdCatNar>());
static auto r1 = registerCommand<CmdCatStore>("cat-store");
static auto r2 = registerCommand<CmdCatNar>("cat-nar");

2
src/nix/command.cc
View file

@ -5,7 +5,7 @@
namespace nix {
std::vector<ref<Command>> * RegisterCommand::commands = 0;
Commands * RegisterCommand::commands = nullptr;
StoreCommand::StoreCommand()
{

15
src/nix/command.hh
View file

@ -151,15 +151,22 @@ struct StorePathCommand : public InstallablesCommand
/* A helper class for registering commands globally. */
struct RegisterCommand
{
static std::vector<ref<Command>> * commands;
static Commands * commands;
RegisterCommand(ref<Command> command)
RegisterCommand(const std::string & name,
std::function<ref<Command>()> command)
{
if (!commands) commands = new std::vector<ref<Command>>;
commands->push_back(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);

7
src/nix/copy.cc
View file

@ -42,11 +42,6 @@ struct CmdCopy : StorePathsCommand
.set(&substitute, Substitute);
}
std::string name() override
{
return "copy";
}
std::string description() override
{
return "copy paths between Nix stores";
@ -97,4 +92,4 @@ struct CmdCopy : StorePathsCommand
}
};
static RegisterCommand r1(make_ref<CmdCopy>());
static auto r1 = registerCommand<CmdCopy>("copy");

7
src/nix/doctor.cc
View file

@ -38,11 +38,6 @@ struct CmdDoctor : StoreCommand
{
bool success = true;
std::string name() override
{
return "doctor";
}
std::string description() override
{
return "check your system for potential problems and print a PASS or FAIL for each check.";
@ -136,4 +131,4 @@ struct CmdDoctor : StoreCommand
}
};
static RegisterCommand r1(make_ref<CmdDoctor>());
static auto r1 = registerCommand<CmdDoctor>("doctore");

7
src/nix/dump-path.cc
View file

@ -5,11 +5,6 @@ using namespace nix;
struct CmdDumpPath : StorePathCommand
{
std::string name() override
{
return "dump-path";
}
std::string description() override
{
return "dump a store path to stdout (in NAR format)";
@ -33,4 +28,4 @@ struct CmdDumpPath : StorePathCommand
}
};
static RegisterCommand r1(make_ref<CmdDumpPath>());
static auto r1 = registerCommand<CmdDumpPath>("dump-path");

7
src/nix/edit.cc
View file

@ -10,11 +10,6 @@ using namespace nix;
struct CmdEdit : InstallableCommand
{
std::string name() override
{
return "edit";
}
std::string description() override
{
return "open the Nix expression of a Nix package in $EDITOR";
@ -50,4 +45,4 @@ struct CmdEdit : InstallableCommand
}
};
static RegisterCommand r1(make_ref<CmdEdit>());
static auto r1 = registerCommand<CmdEdit>("edit");

7
src/nix/eval.cc
View file

@ -18,11 +18,6 @@ struct CmdEval : MixJSON, InstallableCommand
mkFlag(0, "raw", "print strings unquoted", &raw);
}
std::string name() override
{
return "eval";
}
std::string description() override
{
return "evaluate a Nix expression";
@ -74,4 +69,4 @@ struct CmdEval : MixJSON, InstallableCommand
}
};
static RegisterCommand r1(make_ref<CmdEval>());
static auto r1 = registerCommand<CmdEval>("eval");

26
src/nix/hash.cc
View file

@ -36,11 +36,6 @@ struct CmdHash : Command
expectArgs("paths", &paths);
}
std::string name() override
{
return mode == mFile ? "hash-file" : "hash-path";
}
std::string description() override
{
return mode == mFile
@ -71,8 +66,8 @@ struct CmdHash : Command
}
};
static RegisterCommand r1(make_ref<CmdHash>(CmdHash::mFile));
static RegisterCommand r2(make_ref<CmdHash>(CmdHash::mPath));
static RegisterCommand r1("hash-file", [](){ return make_ref<CmdHash>(CmdHash::mFile); });
static RegisterCommand r2("hash-path", [](){ return make_ref<CmdHash>(CmdHash::mPath); });
struct CmdToBase : Command
{
@ -88,15 +83,6 @@ struct CmdToBase : Command
expectArgs("strings", &args);
}
std::string name() override
{
return
base == Base16 ? "to-base16" :
base == Base32 ? "to-base32" :
base == Base64 ? "to-base64" :
"to-sri";
}
std::string description() override
{
return fmt("convert a hash to %s representation",
@ -113,10 +99,10 @@ struct CmdToBase : Command
}
};
static RegisterCommand r3(make_ref<CmdToBase>(Base16));
static RegisterCommand r4(make_ref<CmdToBase>(Base32));
static RegisterCommand r5(make_ref<CmdToBase>(Base64));
static RegisterCommand r6(make_ref<CmdToBase>(SRI));
static RegisterCommand r3("to-base16", [](){ return make_ref<CmdToBase>(Base16); });
static RegisterCommand r4("to-base32", [](){ return make_ref<CmdToBase>(Base32); });
static RegisterCommand r5("to-base64", [](){ return make_ref<CmdToBase>(Base64); });
static RegisterCommand r6("to-sri", [](){ return make_ref<CmdToBase>(SRI); });
/* Legacy nix-hash command. */
static int compatNixHash(int argc, char * * argv)

11
src/nix/log.cc
View file

@ -8,15 +8,6 @@ using namespace nix;
struct CmdLog : InstallableCommand
{
CmdLog()
{
}
std::string name() override
{
return "log";
}
std::string description() override
{
return "show the build log of the specified packages or paths, if available";
@ -68,4 +59,4 @@ struct CmdLog : InstallableCommand
}
};
static RegisterCommand r1(make_ref<CmdLog>());
static auto r1 = registerCommand<CmdLog>("log");

14
src/nix/ls.cc
View file

@ -100,11 +100,6 @@ struct CmdLsStore : StoreCommand, MixLs
};
}
std::string name() override
{
return "ls-store";
}
std::string description() override
{
return "show information about a store path";
@ -136,11 +131,6 @@ struct CmdLsNar : Command, MixLs
};
}
std::string name() override
{
return "ls-nar";
}
std::string description() override
{
return "show information about the contents of a NAR file";
@ -152,5 +142,5 @@ struct CmdLsNar : Command, MixLs
}
};
static RegisterCommand r1(make_ref<CmdLsStore>());
static RegisterCommand r2(make_ref<CmdLsNar>());
static auto r1 = registerCommand<CmdLsStore>("ls-store");
static auto r2 = registerCommand<CmdLsNar>("ls-nar");

7
src/nix/make-content-addressable.cc
View file

@ -11,11 +11,6 @@ struct CmdMakeContentAddressable : StorePathsCommand
realiseMode = Build;
}
std::string name() override
{
return "make-content-addressable";
}
std::string description() override
{
return "rewrite a path or closure to content-addressable form";
@ -92,4 +87,4 @@ struct CmdMakeContentAddressable : StorePathsCommand
}
};
static RegisterCommand r1(make_ref<CmdMakeContentAddressable>());
static auto r1 = registerCommand<CmdMakeContentAddressable>("make-content-addressable");

11
src/nix/optimise-store.cc
View file

@ -8,15 +8,6 @@ using namespace nix;
struct CmdOptimiseStore : StoreCommand
{
CmdOptimiseStore()
{
}
std::string name() override
{
return "optimise-store";
}
std::string description() override
{
return "replace identical files in the store by hard links";
@ -38,4 +29,4 @@ struct CmdOptimiseStore : StoreCommand
}
};
static RegisterCommand r1(make_ref<CmdOptimiseStore>());
static auto r1 = registerCommand<CmdOptimiseStore>("optimise-store");

7
src/nix/path-info.cc
View file

@ -24,11 +24,6 @@ struct CmdPathInfo : StorePathsCommand, MixJSON
mkFlag(0, "sigs", "show signatures", &showSigs);
}
std::string name() override
{
return "path-info";
}
std::string description() override
{
return "query information about store paths";
@ -130,4 +125,4 @@ struct CmdPathInfo : StorePathsCommand, MixJSON
}
};
static RegisterCommand r1(make_ref<CmdPathInfo>());
static auto r1 = registerCommand<CmdPathInfo>("path-info");

7
src/nix/ping-store.cc
View file

@ -6,11 +6,6 @@ using namespace nix;
struct CmdPingStore : StoreCommand
{
std::string name() override
{
return "ping-store";
}
std::string description() override
{
return "test whether a store can be opened";
@ -32,4 +27,4 @@ struct CmdPingStore : StoreCommand
}
};
static RegisterCommand r1(make_ref<CmdPingStore>());
static auto r1 = registerCommand<CmdPingStore>("ping-store");

4
src/nix/repl.cc
View file

@ -801,8 +801,6 @@ struct CmdRepl : StoreCommand, MixEvalArgs
expectArgs("files", &files);
}
std::string name() override { return "repl"; }
std::string description() override
{
return "start an interactive environment for evaluating Nix expressions";
@ -816,6 +814,6 @@ struct CmdRepl : StoreCommand, MixEvalArgs
}
};
static RegisterCommand r1(make_ref<CmdRepl>());
static auto r1 = registerCommand<CmdRepl>("repl");
}

7
src/nix/run.cc
View file

@ -61,11 +61,6 @@ struct CmdRun : InstallablesCommand
.handler([&](std::vector<std::string> ss) { unset.insert(ss.front()); });
}
std::string name() override
{
return "run";
}
std::string description() override
{
return "run a shell in which the specified packages are available";
@ -182,7 +177,7 @@ struct CmdRun : InstallablesCommand
}
};
static RegisterCommand r1(make_ref<CmdRun>());
static auto r1 = registerCommand<CmdRun>("run");
void chrootHelper(int argc, char * * argv)
{

7
src/nix/search.cc
View file

@ -52,11 +52,6 @@ struct CmdSearch : SourceExprCommand, MixJSON
.handler([&]() { writeCache = false; useCache = false; });
}
std::string name() override
{
return "search";
}
std::string description() override
{
return "query available packages";
@ -277,4 +272,4 @@ struct CmdSearch : SourceExprCommand, MixJSON
}
};
static RegisterCommand r1(make_ref<CmdSearch>());
static auto r1 = registerCommand<CmdSearch>("search");

11
src/nix/show-config.cc
View file

@ -8,15 +8,6 @@ using namespace nix;
struct CmdShowConfig : Command, MixJSON
{
CmdShowConfig()
{
}
std::string name() override
{
return "show-config";
}
std::string description() override
{
return "show the Nix configuration";
@ -37,4 +28,4 @@ struct CmdShowConfig : Command, MixJSON
}
};
static RegisterCommand r1(make_ref<CmdShowConfig>());
static auto r1 = registerCommand<CmdShowConfig>("show-config");

7
src/nix/show-derivation.cc
View file

@ -22,11 +22,6 @@ struct CmdShowDerivation : InstallablesCommand
.set(&recursive, true);
}
std::string name() override
{
return "show-derivation";
}
std::string description() override
{
return "show the contents of a store derivation";
@ -116,4 +111,4 @@ struct CmdShowDerivation : InstallablesCommand
}
};
static RegisterCommand r1(make_ref<CmdShowDerivation>());
static auto r1 = registerCommand<CmdShowDerivation>("show-derivation");

14
src/nix/sigs.cc
View file

@ -22,11 +22,6 @@ struct CmdCopySigs : StorePathsCommand
.handler([&](std::vector<std::string> ss) { substituterUris.push_back(ss[0]); });
}
std::string name() override
{
return "copy-sigs";
}
std::string description() override
{
return "copy path signatures from substituters (like binary caches)";
@ -93,7 +88,7 @@ struct CmdCopySigs : StorePathsCommand
}
};
static RegisterCommand r1(make_ref<CmdCopySigs>());
static auto r1 = registerCommand<CmdCopySigs>("copy-sigs");
struct CmdSignPaths : StorePathsCommand
{
@ -109,11 +104,6 @@ struct CmdSignPaths : StorePathsCommand
.dest(&secretKeyFile);
}
std::string name() override
{
return "sign-paths";
}
std::string description() override
{
return "sign the specified paths";
@ -146,4 +136,4 @@ struct CmdSignPaths : StorePathsCommand
}
};
static RegisterCommand r3(make_ref<CmdSignPaths>());
static auto r2 = registerCommand<CmdSignPaths>("sign-paths");

7
src/nix/upgrade-nix.cc
View file

@ -30,11 +30,6 @@ struct CmdUpgradeNix : MixDryRun, StoreCommand
.dest(&storePathsUrl);
}
std::string name() override
{
return "upgrade-nix";
}
std::string description() override
{
return "upgrade Nix to the latest stable version";
@ -157,4 +152,4 @@ struct CmdUpgradeNix : MixDryRun, StoreCommand
}
};
static RegisterCommand r1(make_ref<CmdUpgradeNix>());
static auto r1 = registerCommand<CmdUpgradeNix>("upgrade-nix");

7
src/nix/verify.cc
View file

@ -30,11 +30,6 @@ struct CmdVerify : StorePathsCommand
mkIntFlag('n', "sigs-needed", "require that each path has at least N valid signatures", &sigsNeeded);
}
std::string name() override
{
return "verify";
}
std::string description() override
{
return "verify the integrity of store paths";
@ -180,4 +175,4 @@ struct CmdVerify : StorePathsCommand
}
};
static RegisterCommand r1(make_ref<CmdVerify>());
static auto r1 = registerCommand<CmdVerify>("verify");

7
src/nix/why-depends.cc
View file

@ -44,11 +44,6 @@ struct CmdWhyDepends : SourceExprCommand
.set(&all, true);
}
std::string name() override
{
return "why-depends";
}
std::string description() override
{
return "show why a package has another package in its closure";
@ -264,4 +259,4 @@ struct CmdWhyDepends : SourceExprCommand
}
};
static RegisterCommand r1(make_ref<CmdWhyDepends>());
static auto r1 = registerCommand<CmdWhyDepends>("why-depends");