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MultiCommand: Simplify construction

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(cherry picked from commit 15a16e5c05)
This commit is contained in:
Eelco Dolstra 2018-11-22 15:59:52 +01:00
parent 092af3c826
commit f1b5c76c1a
3 changed files with 15 additions and 8 deletions
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8
src/nix/command.cc
View file

@ -5,7 +5,7 @@
namespace nix { namespace nix {
Commands * RegisterCommand::commands = 0; std::vector<ref<Command>> * RegisterCommand::commands = 0;
void Command::printHelp(const string & programName, std::ostream & out) void Command::printHelp(const string & programName, std::ostream & out)
{ {
@ -22,9 +22,11 @@ void Command::printHelp(const string & programName, std::ostream & out)
} }
} }
MultiCommand::MultiCommand(const Commands & _commands) MultiCommand::MultiCommand(const std::vector<ref<Command>> & _commands)
: commands(_commands)
{ {
for (auto & command : _commands)
commands.emplace(command->name(), command);
expectedArgs.push_back(ExpectedArg{"command", 1, true, [=](std::vector<std::string> ss) { expectedArgs.push_back(ExpectedArg{"command", 1, true, [=](std::vector<std::string> ss) {
assert(!command); assert(!command);
auto i = commands.find(ss[0]); auto i = commands.find(ss[0]);

8
src/nix/command.hh
View file

@ -182,7 +182,7 @@ public:
std::shared_ptr<Command> command; std::shared_ptr<Command> command;
MultiCommand(const Commands & commands); MultiCommand(const std::vector<ref<Command>> & commands);
void printHelp(const string & programName, std::ostream & out) override; void printHelp(const string & programName, std::ostream & out) override;
@ -194,12 +194,12 @@ public:
/* A helper class for registering commands globally. */ /* A helper class for registering commands globally. */
struct RegisterCommand struct RegisterCommand
{ {
static Commands * commands; static std::vector<ref<Command>> * commands;
RegisterCommand(ref<Command> command) RegisterCommand(ref<Command> command)
{ {
if (!commands) commands = new Commands; if (!commands) commands = new std::vector<ref<Command>>;
commands->emplace(command->name(), command); commands->push_back(command);
} }
}; };

7
src/nix/main.cc
View file

@ -104,10 +104,15 @@ struct NixArgs : virtual MultiCommand, virtual MixCommonArgs
"--help-config' for a list of configuration settings.\n"; "--help-config' for a list of configuration settings.\n";
} }
void printHelp(const string & programName, std::ostream & out)
{
MultiCommand::printHelp(programName, out);
std::cout << "\nNote: this program is EXPERIMENTAL and subject to change.\n";
}
void showHelpAndExit() void showHelpAndExit()
{ {
printHelp(programName, std::cout); printHelp(programName, std::cout);
std::cout << "\nNote: this program is EXPERIMENTAL and subject to change.\n";
throw Exit(); throw Exit();
} }
}; };