Add OptTable::PrintHelp.
llvm-svn: 90420
diff --git a/clang/lib/Driver/OptTable.cpp b/clang/lib/Driver/OptTable.cpp
index f68a1d8..fc89cef 100644
--- a/clang/lib/Driver/OptTable.cpp
+++ b/clang/lib/Driver/OptTable.cpp
@@ -11,6 +11,7 @@
#include "clang/Driver/Arg.h"
#include "clang/Driver/ArgList.h"
#include "clang/Driver/Option.h"
+#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
@@ -255,3 +256,77 @@
return Args;
}
+
+static std::string getOptionHelpName(const OptTable &Opts, OptSpecifier Id) {
+ std::string Name = Opts.getOptionName(Id);
+
+ // Add metavar, if used.
+ switch (Opts.getOptionKind(Id)) {
+ case Option::GroupClass: case Option::InputClass: case Option::UnknownClass:
+ assert(0 && "Invalid option with help text.");
+
+ case Option::MultiArgClass: case Option::JoinedAndSeparateClass:
+ assert(0 && "Cannot print metavar for this kind of option.");
+
+ case Option::FlagClass:
+ break;
+
+ case Option::SeparateClass: case Option::JoinedOrSeparateClass:
+ Name += ' ';
+ // FALLTHROUGH
+ case Option::JoinedClass: case Option::CommaJoinedClass:
+ if (const char *MetaVarName = Opts.getOptionMetaVar(Id))
+ Name += MetaVarName;
+ else
+ Name += "<value>";
+ break;
+ }
+
+ return Name;
+}
+
+void OptTable::PrintHelp(llvm::raw_ostream &OS, const char *Name,
+ const char *Title) const {
+ OS << "OVERVIEW: " << Title << "\n";
+ OS << '\n';
+ OS << "USAGE: " << Name << " [options] <inputs>\n";
+ OS << '\n';
+ OS << "OPTIONS:\n";
+
+ // Render help text into (option, help) pairs.
+ std::vector< std::pair<std::string, const char*> > OptionHelp;
+ for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
+ unsigned Id = i + 1;
+ if (const char *Text = getOptionHelpText(Id))
+ OptionHelp.push_back(std::make_pair(getOptionHelpName(*this, Id), Text));
+ }
+
+ // Find the maximum option length.
+ unsigned OptionFieldWidth = 0;
+ for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
+ // Skip titles.
+ if (!OptionHelp[i].second)
+ continue;
+
+ // Limit the amount of padding we are willing to give up for alignment.
+ unsigned Length = OptionHelp[i].first.size();
+ if (Length <= 23)
+ OptionFieldWidth = std::max(OptionFieldWidth, Length);
+ }
+
+ const unsigned InitialPad = 2;
+ for (unsigned i = 0, e = OptionHelp.size(); i != e; ++i) {
+ const std::string &Option = OptionHelp[i].first;
+ int Pad = OptionFieldWidth - int(Option.size());
+ OS.indent(InitialPad) << Option;
+
+ // Break on long option names.
+ if (Pad < 0) {
+ OS << "\n";
+ Pad = OptionFieldWidth + InitialPad;
+ }
+ OS.indent(Pad + 1) << OptionHelp[i].second << '\n';
+ }
+
+ OS.flush();
+}