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#include "command.hh"
#include "store-api.hh"
#include "derivations.hh"
namespace nix {
Commands * RegisterCommand::commands = 0;
void Command::printHelp(const string & programName, std::ostream & out)
{
Args::printHelp(programName, out);
auto exs = examples();
if (!exs.empty()) {
out << "\n";
out << "Examples:\n";
for (auto & ex : exs)
out << "\n"
<< " " << ex.description << "\n" // FIXME: wrap
<< " $ " << ex.command << "\n";
}
}
MultiCommand::MultiCommand(const Commands & _commands)
: commands(_commands)
{
expectedArgs.push_back(ExpectedArg{"command", 1, [=](Strings ss) {
assert(!command);
auto i = commands.find(ss.front());
if (i == commands.end())
throw UsageError(format("‘%1%’ is not a recognised command") % ss.front());
command = i->second;
}});
}
void MultiCommand::printHelp(const string & programName, std::ostream & out)
{
if (command) {
command->printHelp(programName + " " + command->name(), out);
return;
}
out << "Usage: " << programName << " <COMMAND> <FLAGS>... <ARGS>...\n";
out << "\n";
out << "Common flags:\n";
printFlags(out);
out << "\n";
out << "Available commands:\n";
Table2 table;
for (auto & command : commands)
table.push_back(std::make_pair(command.second->name(), command.second->description()));
printTable(out, table);
out << "\n";
out << "For full documentation, run ‘man " << programName << "’ or ‘man " << programName << "-<COMMAND>’.\n";
}
bool MultiCommand::processFlag(Strings::iterator & pos, Strings::iterator end)
{
if (Args::processFlag(pos, end)) return true;
if (command && command->processFlag(pos, end)) return true;
return false;
}
bool MultiCommand::processArgs(const Strings & args, bool finish)
{
if (command)
return command->processArgs(args, finish);
else
return Args::processArgs(args, finish);
}
StoreCommand::StoreCommand()
{
storeUri = getEnv("NIX_REMOTE");
mkFlag(0, "store", "store-uri", "URI of the Nix store to use", &storeUri);
}
ref<Store> StoreCommand::getStore()
{
if (!_store)
_store = createStore();
return ref<Store>(_store);
}
ref<Store> StoreCommand::createStore()
{
return openStore(storeUri);
}
void StoreCommand::run()
{
run(createStore());
}
StorePathsCommand::StorePathsCommand()
{
mkFlag('r', "recursive", "apply operation to closure of the specified paths", &recursive);
mkFlag(0, "all", "apply operation to the entire store", &all);
}
void StorePathsCommand::run(ref<Store> store)
{
Paths storePaths;
if (all) {
if (installables.size())
throw UsageError("‘--all’ does not expect arguments");
for (auto & p : store->queryAllValidPaths())
storePaths.push_back(p);
}
else {
for (auto & p : buildInstallables(store, false))
storePaths.push_back(p);
if (recursive) {
PathSet closure;
store->computeFSClosure(PathSet(storePaths.begin(), storePaths.end()),
closure, false, false);
storePaths = Paths(closure.begin(), closure.end());
}
}
run(store, storePaths);
}
void StorePathCommand::run(ref<Store> store)
{
auto storePaths = buildInstallables(store, false);
if (storePaths.size() != 1)
throw UsageError("this command requires exactly one store path");
run(store, *storePaths.begin());
}
}
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