1 //===-- CommandLine.cpp - Command line parser implementation --------------===//
3 // This class implements a command line argument processor that is useful when
4 // creating a tool. It provides a simple, minimalistic interface that is easily
5 // extensible and supports nonlocal (library) command line options.
7 // Note that rather than trying to figure out what this code does, you could try
8 // reading the library documentation located in docs/CommandLine.html
10 //===----------------------------------------------------------------------===//
12 #include "Support/CommandLine.h"
20 //===----------------------------------------------------------------------===//
21 // Basic, shared command line option processing machinery...
24 // Return the global command line option vector. Making it a function scoped
25 // static ensures that it will be initialized correctly before its first use.
27 static std::map<std::string, Option*> *CommandLineOptions = 0;
28 static std::map<std::string, Option*> &getOpts() {
29 if (CommandLineOptions == 0)
30 CommandLineOptions = new std::map<std::string,Option*>();
31 return *CommandLineOptions;
34 static Option *getOption(const std::string &Str) {
35 if (CommandLineOptions == 0) return 0;
36 std::map<std::string,Option*>::iterator I = CommandLineOptions->find(Str);
37 return I != CommandLineOptions->end() ? I->second : 0;
40 static std::vector<Option*> &getPositionalOpts() {
41 static std::vector<Option*> Positional;
45 static void AddArgument(const char *ArgName, Option *Opt) {
46 if (getOption(ArgName)) {
47 std::cerr << "CommandLine Error: Argument '" << ArgName
48 << "' defined more than once!\n";
50 // Add argument to the argument map!
51 getOpts()[ArgName] = Opt;
55 // RemoveArgument - It's possible that the argument is no longer in the map if
56 // options have already been processed and the map has been deleted!
58 static void RemoveArgument(const char *ArgName, Option *Opt) {
59 if (CommandLineOptions == 0) return;
60 assert(getOption(ArgName) == Opt && "Arg not in map!");
61 CommandLineOptions->erase(ArgName);
62 if (CommandLineOptions->empty()) {
63 delete CommandLineOptions;
64 CommandLineOptions = 0;
68 static const char *ProgramName = 0;
69 static const char *ProgramOverview = 0;
71 static inline bool ProvideOption(Option *Handler, const char *ArgName,
72 const char *Value, int argc, char **argv,
74 // Enforce value requirements
75 switch (Handler->getValueExpectedFlag()) {
77 if (Value == 0 || *Value == 0) { // No value specified?
78 if (i+1 < argc) { // Steal the next argument, like for '-o filename'
81 return Handler->error(" requires a value!");
87 return Handler->error(" does not allow a value! '" +
88 std::string(Value) + "' specified.");
90 case ValueOptional: break;
91 default: std::cerr << "Bad ValueMask flag! CommandLine usage error:"
92 << Handler->getValueExpectedFlag() << "\n"; abort();
95 // Run the handler now!
96 return Handler->addOccurrence(ArgName, Value);
99 static bool ProvidePositionalOption(Option *Handler, const std::string &Arg) {
101 return ProvideOption(Handler, Handler->ArgStr, Arg.c_str(), 0, 0, Dummy);
105 // Option predicates...
106 static inline bool isGrouping(const Option *O) {
107 return O->getFormattingFlag() == cl::Grouping;
109 static inline bool isPrefixedOrGrouping(const Option *O) {
110 return isGrouping(O) || O->getFormattingFlag() == cl::Prefix;
113 // getOptionPred - Check to see if there are any options that satisfy the
114 // specified predicate with names that are the prefixes in Name. This is
115 // checked by progressively stripping characters off of the name, checking to
116 // see if there options that satisfy the predicate. If we find one, return it,
117 // otherwise return null.
119 static Option *getOptionPred(std::string Name, unsigned &Length,
120 bool (*Pred)(const Option*)) {
122 Option *Op = getOption(Name);
123 if (Op && Pred(Op)) {
124 Length = Name.length();
128 if (Name.size() == 1) return 0;
130 Name.erase(Name.end()-1, Name.end()); // Chop off the last character...
131 Op = getOption(Name);
133 // Loop while we haven't found an option and Name still has at least two
134 // characters in it (so that the next iteration will not be the empty
136 } while ((Op == 0 || !Pred(Op)) && Name.size() > 1);
138 if (Op && Pred(Op)) {
139 Length = Name.length();
140 return Op; // Found one!
142 return 0; // No option found!
145 static bool RequiresValue(const Option *O) {
146 return O->getNumOccurrencesFlag() == cl::Required ||
147 O->getNumOccurrencesFlag() == cl::OneOrMore;
150 static bool EatsUnboundedNumberOfValues(const Option *O) {
151 return O->getNumOccurrencesFlag() == cl::ZeroOrMore ||
152 O->getNumOccurrencesFlag() == cl::OneOrMore;
155 void cl::ParseCommandLineOptions(int &argc, char **argv,
156 const char *Overview) {
157 assert((!getOpts().empty() || !getPositionalOpts().empty()) &&
158 "No options specified, or ParseCommandLineOptions called more"
160 ProgramName = argv[0]; // Save this away safe and snug
161 ProgramOverview = Overview;
162 bool ErrorParsing = false;
164 std::map<std::string, Option*> &Opts = getOpts();
165 std::vector<Option*> &PositionalOpts = getPositionalOpts();
167 // Check out the positional arguments to collect information about them.
168 unsigned NumPositionalRequired = 0;
169 Option *ConsumeAfterOpt = 0;
170 if (!PositionalOpts.empty()) {
171 if (PositionalOpts[0]->getNumOccurrencesFlag() == cl::ConsumeAfter) {
172 assert(PositionalOpts.size() > 1 &&
173 "Cannot specify cl::ConsumeAfter without a positional argument!");
174 ConsumeAfterOpt = PositionalOpts[0];
177 // Calculate how many positional values are _required_.
178 bool UnboundedFound = false;
179 for (unsigned i = ConsumeAfterOpt != 0, e = PositionalOpts.size();
181 Option *Opt = PositionalOpts[i];
182 if (RequiresValue(Opt))
183 ++NumPositionalRequired;
184 else if (ConsumeAfterOpt) {
185 // ConsumeAfter cannot be combined with "optional" positional options
186 // unless there is only one positional argument...
187 if (PositionalOpts.size() > 2)
189 Opt->error(" error - this positional option will never be matched, "
190 "because it does not Require a value, and a "
191 "cl::ConsumeAfter option is active!");
192 } else if (UnboundedFound && !Opt->ArgStr[0]) {
193 // This option does not "require" a value... Make sure this option is
194 // not specified after an option that eats all extra arguments, or this
195 // one will never get any!
197 ErrorParsing |= Opt->error(" error - option can never match, because "
198 "another positional argument will match an "
199 "unbounded number of values, and this option"
200 " does not require a value!");
202 UnboundedFound |= EatsUnboundedNumberOfValues(Opt);
206 // PositionalVals - A vector of "positional" arguments we accumulate into to
207 // processes at the end...
209 std::vector<std::string> PositionalVals;
211 // If the program has named positional arguments, and the name has been run
212 // across, keep track of which positional argument was named. Otherwise put
213 // the positional args into the PositionalVals list...
214 Option *ActivePositionalArg = 0;
216 // Loop over all of the arguments... processing them.
217 bool DashDashFound = false; // Have we read '--'?
218 for (int i = 1; i < argc; ++i) {
220 const char *Value = "";
221 const char *ArgName = "";
223 // Check to see if this is a positional argument. This argument is
224 // considered to be positional if it doesn't start with '-', if it is "-"
225 // itself, or if we have seen "--" already.
227 if (argv[i][0] != '-' || argv[i][1] == 0 || DashDashFound) {
228 // Positional argument!
229 if (ActivePositionalArg) {
230 ProvidePositionalOption(ActivePositionalArg, argv[i]);
231 continue; // We are done!
232 } else if (!PositionalOpts.empty()) {
233 PositionalVals.push_back(argv[i]);
235 // All of the positional arguments have been fulfulled, give the rest to
236 // the consume after option... if it's specified...
238 if (PositionalVals.size() >= NumPositionalRequired &&
239 ConsumeAfterOpt != 0) {
240 for (++i; i < argc; ++i)
241 PositionalVals.push_back(argv[i]);
242 break; // Handle outside of the argument processing loop...
245 // Delay processing positional arguments until the end...
248 } else { // We start with a '-', must be an argument...
250 while (*ArgName == '-') ++ArgName; // Eat leading dashes
252 if (*ArgName == 0 && !DashDashFound) { // Is this the mythical "--"?
253 DashDashFound = true; // Yup, take note of that fact...
254 continue; // Don't try to process it as an argument iself.
257 const char *ArgNameEnd = ArgName;
258 while (*ArgNameEnd && *ArgNameEnd != '=')
259 ++ArgNameEnd; // Scan till end of argument name...
262 if (*Value) // If we have an equals sign...
263 ++Value; // Advance to value...
266 std::string RealName(ArgName, ArgNameEnd);
267 // Extract arg name part
268 std::map<std::string, Option*>::iterator I = Opts.find(RealName);
270 if (I == Opts.end() && !*Value && RealName.size() > 1) {
271 // Check to see if this "option" is really a prefixed or grouped
275 Option *PGOpt = getOptionPred(RealName, Length, isPrefixedOrGrouping);
277 // If the option is a prefixed option, then the value is simply the
278 // rest of the name... so fall through to later processing, by
279 // setting up the argument name flags and value fields.
281 if (PGOpt && PGOpt->getFormattingFlag() == cl::Prefix) {
282 ArgNameEnd = ArgName+Length;
284 I = Opts.find(std::string(ArgName, ArgNameEnd));
285 assert(I->second == PGOpt);
287 // This must be a grouped option... handle all of them now...
288 assert(isGrouping(PGOpt) && "Broken getOptionPred!");
291 // Move current arg name out of RealName into RealArgName...
292 std::string RealArgName(RealName.begin(),RealName.begin()+Length);
293 RealName.erase(RealName.begin(), RealName.begin()+Length);
295 // Because ValueRequired is an invalid flag for grouped arguments,
296 // we don't need to pass argc/argv in...
298 assert(PGOpt->getValueExpectedFlag() != cl::ValueRequired &&
299 "Option can not be cl::Grouping AND cl::ValueRequired!");
301 ErrorParsing |= ProvideOption(PGOpt, RealArgName.c_str(), "",
304 // Get the next grouping option...
305 if (!RealName.empty())
306 PGOpt = getOptionPred(RealName, Length, isGrouping);
307 } while (!RealName.empty() && PGOpt);
309 if (RealName.empty()) // Processed all of the options, move on
310 continue; // to the next argv[] value...
312 // If RealName is not empty, that means we did not match one of the
313 // options! This is an error.
319 Handler = I != Opts.end() ? I->second : 0;
324 std::cerr << "Unknown command line argument '" << argv[i] << "'. Try: "
325 << argv[0] << " --help'\n";
330 // Check to see if this option accepts a comma separated list of values. If
331 // it does, we have to split up the value into multiple values...
332 if (Handler->getMiscFlags() & CommaSeparated) {
333 std::string Val(Value);
334 std::string::size_type Pos = Val.find(',');
336 while (Pos != std::string::npos) {
337 // Process the portion before the comma...
338 ErrorParsing |= ProvideOption(Handler, ArgName,
339 std::string(Val.begin(),
340 Val.begin()+Pos).c_str(),
342 // Erase the portion before the comma, AND the comma...
343 Val.erase(Val.begin(), Val.begin()+Pos+1);
344 Value += Pos+1; // Increment the original value pointer as well...
346 // Check for another comma...
351 // If this is a named positional argument, just remember that it is the
353 if (Handler->getFormattingFlag() == cl::Positional)
354 ActivePositionalArg = Handler;
356 ErrorParsing |= ProvideOption(Handler, ArgName, Value, argc, argv, i);
359 // Check and handle positional arguments now...
360 if (NumPositionalRequired > PositionalVals.size()) {
361 std::cerr << "Not enough positional command line arguments specified!\n"
362 << "Must specify at least " << NumPositionalRequired
363 << " positional arguments: See: " << argv[0] << " --help\n";
367 } else if (ConsumeAfterOpt == 0) {
368 // Positional args have already been handled if ConsumeAfter is specified...
369 unsigned ValNo = 0, NumVals = PositionalVals.size();
370 for (unsigned i = 0, e = PositionalOpts.size(); i != e; ++i) {
371 if (RequiresValue(PositionalOpts[i])) {
372 ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo++]);
373 --NumPositionalRequired; // We fulfilled our duty...
376 // If we _can_ give this option more arguments, do so now, as long as we
377 // do not give it values that others need. 'Done' controls whether the
378 // option even _WANTS_ any more.
380 bool Done = PositionalOpts[i]->getNumOccurrencesFlag() == cl::Required;
381 while (NumVals-ValNo > NumPositionalRequired && !Done) {
382 switch (PositionalOpts[i]->getNumOccurrencesFlag()) {
384 Done = true; // Optional arguments want _at most_ one value
386 case cl::ZeroOrMore: // Zero or more will take all they can get...
387 case cl::OneOrMore: // One or more will take all they can get...
388 ProvidePositionalOption(PositionalOpts[i], PositionalVals[ValNo++]);
391 assert(0 && "Internal error, unexpected NumOccurrences flag in "
392 "positional argument processing!");
397 assert(ConsumeAfterOpt && NumPositionalRequired <= PositionalVals.size());
399 for (unsigned j = 1, e = PositionalOpts.size(); j != e; ++j)
400 if (RequiresValue(PositionalOpts[j]))
401 ErrorParsing |= ProvidePositionalOption(PositionalOpts[j],
402 PositionalVals[ValNo++]);
404 // Handle the case where there is just one positional option, and it's
405 // optional. In this case, we want to give JUST THE FIRST option to the
406 // positional option and keep the rest for the consume after. The above
407 // loop would have assigned no values to positional options in this case.
409 if (PositionalOpts.size() == 2 && ValNo == 0 && !PositionalVals.empty())
410 ErrorParsing |= ProvidePositionalOption(PositionalOpts[1],
411 PositionalVals[ValNo++]);
413 // Handle over all of the rest of the arguments to the
414 // cl::ConsumeAfter command line option...
415 for (; ValNo != PositionalVals.size(); ++ValNo)
416 ErrorParsing |= ProvidePositionalOption(ConsumeAfterOpt,
417 PositionalVals[ValNo]);
420 // Loop over args and make sure all required args are specified!
421 for (std::map<std::string, Option*>::iterator I = Opts.begin(),
422 E = Opts.end(); I != E; ++I) {
423 switch (I->second->getNumOccurrencesFlag()) {
426 if (I->second->getNumOccurrences() == 0) {
427 I->second->error(" must be specified at least once!");
436 // Free all of the memory allocated to the map. Command line options may only
437 // be processed once!
438 delete CommandLineOptions;
439 CommandLineOptions = 0;
440 PositionalOpts.clear();
442 // If we had an error processing our arguments, don't let the program execute
443 if (ErrorParsing) exit(1);
446 //===----------------------------------------------------------------------===//
447 // Option Base class implementation
450 bool Option::error(std::string Message, const char *ArgName) {
451 if (ArgName == 0) ArgName = ArgStr;
453 std::cerr << HelpStr; // Be nice for positional arguments
455 std::cerr << "-" << ArgName;
456 std::cerr << " option" << Message << "\n";
460 bool Option::addOccurrence(const char *ArgName, const std::string &Value) {
461 NumOccurrences++; // Increment the number of times we have been seen
463 switch (getNumOccurrencesFlag()) {
465 if (NumOccurrences > 1)
466 return error(": may only occur zero or one times!", ArgName);
469 if (NumOccurrences > 1)
470 return error(": must occur exactly one time!", ArgName);
474 case ConsumeAfter: break;
475 default: return error(": bad num occurrences flag value!");
478 return handleOccurrence(ArgName, Value);
481 // addArgument - Tell the system that this Option subclass will handle all
482 // occurrences of -ArgStr on the command line.
484 void Option::addArgument(const char *ArgStr) {
486 AddArgument(ArgStr, this);
488 if (getFormattingFlag() == Positional)
489 getPositionalOpts().push_back(this);
490 else if (getNumOccurrencesFlag() == ConsumeAfter) {
491 if (!getPositionalOpts().empty() &&
492 getPositionalOpts().front()->getNumOccurrencesFlag() == ConsumeAfter)
493 error("Cannot specify more than one option with cl::ConsumeAfter!");
494 getPositionalOpts().insert(getPositionalOpts().begin(), this);
498 void Option::removeArgument(const char *ArgStr) {
500 RemoveArgument(ArgStr, this);
502 if (getFormattingFlag() == Positional) {
503 std::vector<Option*>::iterator I =
504 std::find(getPositionalOpts().begin(), getPositionalOpts().end(), this);
505 assert(I != getPositionalOpts().end() && "Arg not registered!");
506 getPositionalOpts().erase(I);
507 } else if (getNumOccurrencesFlag() == ConsumeAfter) {
508 assert(!getPositionalOpts().empty() && getPositionalOpts()[0] == this &&
509 "Arg not registered correctly!");
510 getPositionalOpts().erase(getPositionalOpts().begin());
515 // getValueStr - Get the value description string, using "DefaultMsg" if nothing
516 // has been specified yet.
518 static const char *getValueStr(const Option &O, const char *DefaultMsg) {
519 if (O.ValueStr[0] == 0) return DefaultMsg;
523 //===----------------------------------------------------------------------===//
524 // cl::alias class implementation
527 // Return the width of the option tag for printing...
528 unsigned alias::getOptionWidth() const {
529 return std::strlen(ArgStr)+6;
532 // Print out the option for the alias...
533 void alias::printOptionInfo(unsigned GlobalWidth) const {
534 unsigned L = std::strlen(ArgStr);
535 std::cerr << " -" << ArgStr << std::string(GlobalWidth-L-6, ' ') << " - "
541 //===----------------------------------------------------------------------===//
542 // Parser Implementation code...
545 // basic_parser implementation
548 // Return the width of the option tag for printing...
549 unsigned basic_parser_impl::getOptionWidth(const Option &O) const {
550 unsigned Len = std::strlen(O.ArgStr);
551 if (const char *ValName = getValueName())
552 Len += std::strlen(getValueStr(O, ValName))+3;
557 // printOptionInfo - Print out information about this option. The
558 // to-be-maintained width is specified.
560 void basic_parser_impl::printOptionInfo(const Option &O,
561 unsigned GlobalWidth) const {
562 std::cerr << " -" << O.ArgStr;
564 if (const char *ValName = getValueName())
565 std::cerr << "=<" << getValueStr(O, ValName) << ">";
567 std::cerr << std::string(GlobalWidth-getOptionWidth(O), ' ') << " - "
568 << O.HelpStr << "\n";
574 // parser<bool> implementation
576 bool parser<bool>::parse(Option &O, const char *ArgName,
577 const std::string &Arg, bool &Value) {
578 if (Arg == "" || Arg == "true" || Arg == "TRUE" || Arg == "True" ||
581 } else if (Arg == "false" || Arg == "FALSE" || Arg == "False" || Arg == "0") {
584 return O.error(": '" + Arg +
585 "' is invalid value for boolean argument! Try 0 or 1");
590 // parser<int> implementation
592 bool parser<int>::parse(Option &O, const char *ArgName,
593 const std::string &Arg, int &Value) {
595 Value = (int)strtol(Arg.c_str(), &End, 0);
597 return O.error(": '" + Arg + "' value invalid for integer argument!");
601 // parser<unsigned> implementation
603 bool parser<unsigned>::parse(Option &O, const char *ArgName,
604 const std::string &Arg, unsigned &Value) {
606 long long int V = strtoll(Arg.c_str(), &End, 0);
608 if (*End != 0 || V < 0 || Value != V)
609 return O.error(": '" + Arg + "' value invalid for uint argument!");
613 // parser<double>/parser<float> implementation
615 static bool parseDouble(Option &O, const std::string &Arg, double &Value) {
616 const char *ArgStart = Arg.c_str();
618 Value = strtod(ArgStart, &End);
620 return O.error(": '" +Arg+ "' value invalid for floating point argument!");
624 bool parser<double>::parse(Option &O, const char *AN,
625 const std::string &Arg, double &Val) {
626 return parseDouble(O, Arg, Val);
629 bool parser<float>::parse(Option &O, const char *AN,
630 const std::string &Arg, float &Val) {
632 if (parseDouble(O, Arg, dVal))
640 // generic_parser_base implementation
643 // findOption - Return the option number corresponding to the specified
644 // argument string. If the option is not found, getNumOptions() is returned.
646 unsigned generic_parser_base::findOption(const char *Name) {
647 unsigned i = 0, e = getNumOptions();
651 if (getOption(i) == N)
659 // Return the width of the option tag for printing...
660 unsigned generic_parser_base::getOptionWidth(const Option &O) const {
662 unsigned Size = std::strlen(O.ArgStr)+6;
663 for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
664 Size = std::max(Size, (unsigned)std::strlen(getOption(i))+8);
667 unsigned BaseSize = 0;
668 for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
669 BaseSize = std::max(BaseSize, (unsigned)std::strlen(getOption(i))+8);
674 // printOptionInfo - Print out information about this option. The
675 // to-be-maintained width is specified.
677 void generic_parser_base::printOptionInfo(const Option &O,
678 unsigned GlobalWidth) const {
680 unsigned L = std::strlen(O.ArgStr);
681 std::cerr << " -" << O.ArgStr << std::string(GlobalWidth-L-6, ' ')
682 << " - " << O.HelpStr << "\n";
684 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
685 unsigned NumSpaces = GlobalWidth-strlen(getOption(i))-8;
686 std::cerr << " =" << getOption(i) << std::string(NumSpaces, ' ')
687 << " - " << getDescription(i) << "\n";
691 std::cerr << " " << O.HelpStr << "\n";
692 for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
693 unsigned L = std::strlen(getOption(i));
694 std::cerr << " -" << getOption(i) << std::string(GlobalWidth-L-8, ' ')
695 << " - " << getDescription(i) << "\n";
701 //===----------------------------------------------------------------------===//
702 // --help and --help-hidden option implementation
708 const Option *EmptyArg;
709 const bool ShowHidden;
711 // isHidden/isReallyHidden - Predicates to be used to filter down arg lists.
712 inline static bool isHidden(std::pair<std::string, Option *> &OptPair) {
713 return OptPair.second->getOptionHiddenFlag() >= Hidden;
715 inline static bool isReallyHidden(std::pair<std::string, Option *> &OptPair) {
716 return OptPair.second->getOptionHiddenFlag() == ReallyHidden;
720 HelpPrinter(bool showHidden) : ShowHidden(showHidden) {
724 void operator=(bool Value) {
725 if (Value == false) return;
727 // Copy Options into a vector so we can sort them as we like...
728 std::vector<std::pair<std::string, Option*> > Options;
729 copy(getOpts().begin(), getOpts().end(), std::back_inserter(Options));
731 // Eliminate Hidden or ReallyHidden arguments, depending on ShowHidden
732 Options.erase(std::remove_if(Options.begin(), Options.end(),
733 std::ptr_fun(ShowHidden ? isReallyHidden : isHidden)),
736 // Eliminate duplicate entries in table (from enum flags options, f.e.)
737 { // Give OptionSet a scope
738 std::set<Option*> OptionSet;
739 for (unsigned i = 0; i != Options.size(); ++i)
740 if (OptionSet.count(Options[i].second) == 0)
741 OptionSet.insert(Options[i].second); // Add new entry to set
743 Options.erase(Options.begin()+i--); // Erase duplicate
747 std::cerr << "OVERVIEW:" << ProgramOverview << "\n";
749 std::cerr << "USAGE: " << ProgramName << " [options]";
751 // Print out the positional options...
752 std::vector<Option*> &PosOpts = getPositionalOpts();
753 Option *CAOpt = 0; // The cl::ConsumeAfter option, if it exists...
754 if (!PosOpts.empty() && PosOpts[0]->getNumOccurrencesFlag() == ConsumeAfter)
757 for (unsigned i = CAOpt != 0, e = PosOpts.size(); i != e; ++i) {
758 if (PosOpts[i]->ArgStr[0])
759 std::cerr << " --" << PosOpts[i]->ArgStr;
760 std::cerr << " " << PosOpts[i]->HelpStr;
763 // Print the consume after option info if it exists...
764 if (CAOpt) std::cerr << " " << CAOpt->HelpStr;
768 // Compute the maximum argument length...
770 for (unsigned i = 0, e = Options.size(); i != e; ++i)
771 MaxArgLen = std::max(MaxArgLen, Options[i].second->getOptionWidth());
773 std::cerr << "OPTIONS:\n";
774 for (unsigned i = 0, e = Options.size(); i != e; ++i)
775 Options[i].second->printOptionInfo(MaxArgLen);
777 // Halt the program if help information is printed
784 // Define the two HelpPrinter instances that are used to print out help, or
787 HelpPrinter NormalPrinter(false);
788 HelpPrinter HiddenPrinter(true);
790 cl::opt<HelpPrinter, true, parser<bool> >
791 HOp("help", cl::desc("display available options (--help-hidden for more)"),
792 cl::location(NormalPrinter), cl::ValueDisallowed);
794 cl::opt<HelpPrinter, true, parser<bool> >
795 HHOp("help-hidden", cl::desc("display all available options"),
796 cl::location(HiddenPrinter), cl::Hidden, cl::ValueDisallowed);
798 } // End anonymous namespace