forked from lix-project/lix
6438ba22af
On second though this was annoying. E.g. "nix log nixpkgs.hello" would build/download Hello first, even though the log can be fetched directly from the binary cache. May need to revisit this.
143 lines
3.5 KiB
C++
143 lines
3.5 KiB
C++
#include "command.hh"
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#include "store-api.hh"
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#include "derivations.hh"
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namespace nix {
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Commands * RegisterCommand::commands = 0;
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void Command::printHelp(const string & programName, std::ostream & out)
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{
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Args::printHelp(programName, out);
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auto exs = examples();
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if (!exs.empty()) {
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out << "\n";
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out << "Examples:\n";
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for (auto & ex : exs)
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out << "\n"
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<< " " << ex.description << "\n" // FIXME: wrap
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<< " $ " << ex.command << "\n";
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}
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}
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MultiCommand::MultiCommand(const Commands & _commands)
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: commands(_commands)
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{
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expectedArgs.push_back(ExpectedArg{"command", 1, true, [=](Strings ss) {
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assert(!command);
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auto i = commands.find(ss.front());
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if (i == commands.end())
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throw UsageError(format("‘%1%’ is not a recognised command") % ss.front());
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command = i->second;
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}});
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}
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void MultiCommand::printHelp(const string & programName, std::ostream & out)
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{
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if (command) {
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command->printHelp(programName + " " + command->name(), out);
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return;
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}
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out << "Usage: " << programName << " <COMMAND> <FLAGS>... <ARGS>...\n";
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out << "\n";
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out << "Common flags:\n";
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printFlags(out);
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out << "\n";
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out << "Available commands:\n";
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Table2 table;
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for (auto & command : commands)
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table.push_back(std::make_pair(command.second->name(), command.second->description()));
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printTable(out, table);
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out << "\n";
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out << "For full documentation, run ‘man " << programName << "’ or ‘man " << programName << "-<COMMAND>’.\n";
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}
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bool MultiCommand::processFlag(Strings::iterator & pos, Strings::iterator end)
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{
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if (Args::processFlag(pos, end)) return true;
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if (command && command->processFlag(pos, end)) return true;
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return false;
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}
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bool MultiCommand::processArgs(const Strings & args, bool finish)
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{
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if (command)
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return command->processArgs(args, finish);
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else
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return Args::processArgs(args, finish);
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}
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StoreCommand::StoreCommand()
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{
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storeUri = getEnv("NIX_REMOTE");
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mkFlag(0, "store", "store-uri", "URI of the Nix store to use", &storeUri);
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}
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ref<Store> StoreCommand::getStore()
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{
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if (!_store)
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_store = createStore();
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return ref<Store>(_store);
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}
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ref<Store> StoreCommand::createStore()
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{
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return openStore(storeUri);
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}
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void StoreCommand::run()
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{
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run(createStore());
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}
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StorePathsCommand::StorePathsCommand()
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{
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mkFlag('r', "recursive", "apply operation to closure of the specified paths", &recursive);
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mkFlag(0, "all", "apply operation to the entire store", &all);
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}
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void StorePathsCommand::run(ref<Store> store)
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{
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Paths storePaths;
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if (all) {
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if (installables.size())
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throw UsageError("‘--all’ does not expect arguments");
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for (auto & p : store->queryAllValidPaths())
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storePaths.push_back(p);
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}
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else {
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for (auto & p : toStorePaths(store, NoBuild))
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storePaths.push_back(p);
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if (recursive) {
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PathSet closure;
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store->computeFSClosure(PathSet(storePaths.begin(), storePaths.end()),
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closure, false, false);
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storePaths = Paths(closure.begin(), closure.end());
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}
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}
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run(store, storePaths);
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}
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void StorePathCommand::run(ref<Store> store)
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{
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auto storePaths = toStorePaths(store, NoBuild);
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if (storePaths.size() != 1)
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throw UsageError("this command requires exactly one store path");
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run(store, *storePaths.begin());
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}
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}
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