diff options
| -rw-r--r-- | src/nix.cc | 29 | ||||
| -rw-r--r-- | src/test.cc | 3 |
2 files changed, 28 insertions, 4 deletions
diff --git a/src/nix.cc b/src/nix.cc index fae3175ba..b2bb3bb1a 100644 --- a/src/nix.cc +++ b/src/nix.cc @@ -62,6 +62,29 @@ static void opAdd(Strings opFlags, Strings opArgs) } +/* A sink that writes dump output to stdout. */ +struct StdoutSink : DumpSink +{ + virtual void operator () + (const unsigned char * data, unsigned int len) + { + /* Don't use cout, it's slow as hell! */ + write(STDOUT_FILENO, (char *) data, len); + } +}; + + +/* Dump a value to standard output */ +static void opDump(Strings opFlags, Strings opArgs) +{ + if (!opFlags.empty()) throw UsageError("unknown flag"); + if (opArgs.size() != 1) throw UsageError("only one argument allowed"); + + StdoutSink sink; + dumpPath(opArgs[0], sink); +} + + /* Initialise the Nix databases. */ static void opInit(Strings opFlags, Strings opArgs) { @@ -83,7 +106,7 @@ static void opInit(Strings opFlags, Strings opArgs) --query / -q: query stored values --add: add values --verify: verify Nix structures - --dump: dump a value + --dump: dump a file or value --init: initialise the Nix database --version: output version information --help: display help @@ -134,6 +157,8 @@ void run(Strings::iterator argCur, Strings::iterator argEnd) op = opDelete; else if (arg == "--add") op = opAdd; + else if (arg == "--dump") + op = opDump; else if (arg == "--init") op = opInit; else if (arg[0] == '-') @@ -158,11 +183,9 @@ int main(int argc, char * * argv) ATinit(argc, argv, &bottomOfStack); try { - Strings args; while (argc--) args.push_back(*argv++); run(args.begin() + 1, args.end()); - } catch (UsageError & e) { cerr << "error: " << e.what() << endl << "Try `nix --help' for more information.\n"; diff --git a/src/test.cc b/src/test.cc index 019c7bf7e..a3706472e 100644 --- a/src/test.cc +++ b/src/test.cc @@ -21,7 +21,8 @@ struct MySink : DumpSink { virtual void operator () (const unsigned char * data, unsigned int len) { - cout.write((char *) data, len); + /* Don't use cout, it's slow as hell! */ + write(STDOUT_FILENO, (char *) data, len); } }; |