forked from lix-project/lix
* `nix --dump' command.
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parent
aeaffec785
commit
38e12df631
29
src/nix.cc
29
src/nix.cc
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@ -62,6 +62,29 @@ static void opAdd(Strings opFlags, Strings opArgs)
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}
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/* A sink that writes dump output to stdout. */
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struct StdoutSink : DumpSink
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{
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virtual void operator ()
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(const unsigned char * data, unsigned int len)
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{
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/* Don't use cout, it's slow as hell! */
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write(STDOUT_FILENO, (char *) data, len);
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}
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};
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/* Dump a value to standard output */
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static void opDump(Strings opFlags, Strings opArgs)
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{
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if (!opFlags.empty()) throw UsageError("unknown flag");
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if (opArgs.size() != 1) throw UsageError("only one argument allowed");
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StdoutSink sink;
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dumpPath(opArgs[0], sink);
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}
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/* Initialise the Nix databases. */
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static void opInit(Strings opFlags, Strings opArgs)
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{
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@ -83,7 +106,7 @@ static void opInit(Strings opFlags, Strings opArgs)
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--query / -q: query stored values
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--add: add values
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--verify: verify Nix structures
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--dump: dump a value
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--dump: dump a file or value
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--init: initialise the Nix database
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--version: output version information
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--help: display help
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@ -134,6 +157,8 @@ void run(Strings::iterator argCur, Strings::iterator argEnd)
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op = opDelete;
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else if (arg == "--add")
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op = opAdd;
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else if (arg == "--dump")
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op = opDump;
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else if (arg == "--init")
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op = opInit;
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else if (arg[0] == '-')
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@ -158,11 +183,9 @@ int main(int argc, char * * argv)
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ATinit(argc, argv, &bottomOfStack);
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try {
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Strings args;
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while (argc--) args.push_back(*argv++);
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run(args.begin() + 1, args.end());
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} catch (UsageError & e) {
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cerr << "error: " << e.what() << endl
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<< "Try `nix --help' for more information.\n";
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@ -21,7 +21,8 @@ struct MySink : DumpSink
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{
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virtual void operator () (const unsigned char * data, unsigned int len)
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{
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cout.write((char *) data, len);
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/* Don't use cout, it's slow as hell! */
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write(STDOUT_FILENO, (char *) data, len);
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}
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};
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