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* Minor refactoring: use iterators to process arguments.

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This commit is contained in:
Eelco Dolstra 2003-04-04 12:02:40 +00:00
parent c68dca5dac
commit ab723e341a
1 changed files with 79 additions and 80 deletions
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159
src/nix.cc
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@ -70,6 +70,9 @@ public:
};
typedef vector<string> Strings;
/* Wrapper classes that ensures that the database is closed upon
object destruction. */
class Db2 : public Db
@ -427,7 +430,9 @@ string getPkg(string hash)
}
void runPkg(string hash, const vector<string> & args)
void runPkg(string hash,
Strings::iterator firstArg,
Strings::iterator lastArg)
{
string src;
string path;
@ -453,8 +458,7 @@ void runPkg(string hash, const vector<string> & args)
const char * args2[env.size() + 2];
int i = 0;
args2[i++] = runner.c_str();
for (vector<string>::const_iterator it = args.begin();
it != args.end(); it++, i++)
for (Strings::const_iterator it = firstArg; it != lastArg; it++, i++)
args2[i] = it->c_str();
args2[i] = 0;
@ -493,11 +497,11 @@ void delPkg(string hash)
}
void exportPkgs(string outDir, vector<string> hashes)
void exportPkgs(string outDir,
Strings::iterator firstHash,
Strings::iterator lastHash)
{
for (vector<string>::iterator it = hashes.begin();
it != hashes.end(); it++)
{
for (Strings::iterator it = firstHash; it != lastHash; it++) {
string hash = *it;
string pkgDir = getPkg(hash);
string tmpFile = outDir + "/export_tmp";
@ -616,10 +620,9 @@ void listInstalledPkgs()
}
void printInfo(vector<string> hashes)
void printInfo(Strings::iterator first, Strings::iterator last)
{
for (vector<string>::iterator it = hashes.begin();
it != hashes.end(); it++)
for (Strings::iterator it = first; it != last; it++)
{
try {
cout << *it << " " << queryPkgId(*it) << endl;
@ -630,10 +633,10 @@ void printInfo(vector<string> hashes)
}
void computeClosure(const vector<string> & rootHashes,
void computeClosure(Strings::iterator first, Strings::iterator last,
set<string> & result)
{
list<string> workList(rootHashes.begin(), rootHashes.end());
list<string> workList(first, last);
set<string> doneSet;
while (!workList.empty()) {
@ -656,10 +659,10 @@ void computeClosure(const vector<string> & rootHashes,
}
void printClosure(const vector<string> & rootHashes)
void printClosure(Strings::iterator first, Strings::iterator last)
{
set<string> allHashes;
computeClosure(rootHashes, allHashes);
computeClosure(first, last, allHashes);
for (set<string>::iterator it = allHashes.begin();
it != allHashes.end(); it++)
cout << *it << endl;
@ -672,10 +675,10 @@ string dotQuote(const string & s)
}
void printGraph(vector<string> rootHashes)
void printGraph(Strings::iterator first, Strings::iterator last)
{
set<string> allHashes;
computeClosure(rootHashes, allHashes);
computeClosure(first, last, allHashes);
cout << "digraph G {\n";
@ -699,58 +702,8 @@ void printGraph(vector<string> rootHashes)
}
void run(vector<string> args)
void run(Strings args)
{
UsageError argcError("wrong number of arguments");
string cmd;
if (args.size() < 1) throw UsageError("no command specified");
cmd = args[0];
args.erase(args.begin()); // O(n)
if (cmd == "init") {
if (args.size() != 0) throw argcError;
initDB();
} else if (cmd == "verify") {
if (args.size() != 0) throw argcError;
verifyDB();
} else if (cmd == "getpkg") {
if (args.size() != 1) throw argcError;
string path = getPkg(args[0]);
cout << path << endl;
} else if (cmd == "delpkg") {
if (args.size() != 1) throw argcError;
delPkg(args[0]);
} else if (cmd == "run") {
if (args.size() < 1) throw argcError;
runPkg(args[0], vector<string>(args.begin() + 1, args.end()));
} else if (cmd == "ensure") {
if (args.size() != 1) throw argcError;
ensurePkg(args[0]);
} else if (cmd == "export") {
if (args.size() < 1) throw argcError;
exportPkgs(args[0], vector<string>(args.begin() + 1, args.end()));
} else if (cmd == "regprebuilt") {
if (args.size() != 2) throw argcError;
regPrebuilt(args[0], args[1]);
} else if (cmd == "regfile") {
if (args.size() != 1) throw argcError;
registerFile(args[0]);
} else if (cmd == "reginst") {
if (args.size() != 2) throw argcError;
registerInstalledPkg(args[0], args[1]);
} else if (cmd == "listinst") {
if (args.size() != 0) throw argcError;
listInstalledPkgs();
} else if (cmd == "info") {
printInfo(args);
} else if (cmd == "closure") {
printClosure(args);
} else if (cmd == "graph") {
printGraph(args);
} else
throw UsageError("unknown command: " + string(cmd));
}
@ -810,7 +763,7 @@ Subcommands:
}
void main2(int argc, char * * argv)
void run(Strings::iterator argCur, Strings::iterator argEnd)
{
umask(0022);
@ -821,8 +774,8 @@ void main2(int argc, char * * argv)
pkgHome = getenv(PKGHOME_ENVVAR);
/* Parse the global flags. */
while (argc) {
string arg(*argv);
for ( ; argCur != argEnd; argCur++) {
string arg(*argCur);
if (arg == "-h" || arg == "--help") {
printUsage();
return;
@ -831,13 +784,57 @@ void main2(int argc, char * * argv)
} else if (arg[0] == '-') {
throw UsageError("invalid option `" + arg + "'");
} else break;
argv++, argc--;
}
/* Put the remainder in a vector and pass it to run2(). */
vector<string> args;
while (argc--) args.push_back(*argv++);
run(args);
UsageError argcError("wrong number of arguments");
/* Parse the command. */
if (argCur == argEnd) throw UsageError("no command specified");
string cmd = *argCur++;
int argc = argEnd - argCur;
if (cmd == "init") {
if (argc != 0) throw argcError;
initDB();
} else if (cmd == "verify") {
if (argc != 0) throw argcError;
verifyDB();
} else if (cmd == "getpkg") {
if (argc != 1) throw argcError;
string path = getPkg(*argCur);
cout << path << endl;
} else if (cmd == "delpkg") {
if (argc != 1) throw argcError;
delPkg(*argCur);
} else if (cmd == "run") {
if (argc < 1) throw argcError;
runPkg(*argCur, argCur + 1, argEnd);
} else if (cmd == "ensure") {
if (argc != 1) throw argcError;
ensurePkg(*argCur);
} else if (cmd == "export") {
if (argc < 1) throw argcError;
exportPkgs(*argCur, argCur + 1, argEnd);
} else if (cmd == "regprebuilt") {
if (argc != 2) throw argcError;
regPrebuilt(*argCur, argCur[1]);
} else if (cmd == "regfile") {
if (argc != 1) throw argcError;
registerFile(*argCur);
} else if (cmd == "reginst") {
if (argc != 2) throw argcError;
registerInstalledPkg(*argCur, argCur[1]);
} else if (cmd == "listinst") {
if (argc != 0) throw argcError;
listInstalledPkgs();
} else if (cmd == "info") {
printInfo(argCur, argEnd);
} else if (cmd == "closure") {
printClosure(argCur, argEnd);
} else if (cmd == "graph") {
printGraph(argCur, argEnd);
} else
throw UsageError("unknown command: " + string(cmd));
}
@ -846,17 +843,19 @@ int main(int argc, char * * argv)
ATerm bottomOfStack;
ATinit(argc, argv, &bottomOfStack);
prog = *argv++, argc--;
/* Put the arguments in a vector. */
Strings args;
while (argc--) args.push_back(*argv++);
Strings::iterator argCur = args.begin(), argEnd = args.end();
prog = *argCur++;
try {
try {
main2(argc, argv);
run(argCur, argEnd);
} catch (DbException e) {
throw Error(e.what());
}
} catch (UsageError & e) {
cerr << "error: " << e.what() << endl
<< "Try `nix -h' for more information.\n";