[clang-tidy] Default options in modules.

Summary:
This patch allows modules to specify default options for the checks
defined in them. This way a sufficiently configurable check can be registered in
multiple modules with different default options. E.g. the SpacesBeforeComments
option may be set to 1 for the "llvm-namespace-comments" check and to 2 for the
"google-readability-namespace-comment" check without modifying or extending the
check code.

This patch also registers the google-readability-braces-around-statements check
with suitable defaults.

Reviewers: djasper

Reviewed By: djasper

Subscribers: curdeius, cfe-commits

Differential Revision: http://reviews.llvm.org/D5798

llvm-svn: 219923

1 files changed, 14 insertions, 0 deletions

diff --git a/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp b/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
index a4bfe0488c1..5283a5cd2cc 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidyOptions.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "ClangTidyOptions.h"
+#include "ClangTidyModuleRegistry.h"
 #include "clang/Basic/LLVM.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/Errc.h"
@@ -96,6 +97,19 @@ template <> struct MappingTraits<ClangTidyOptions> {
 namespace clang {
 namespace tidy {
 
+ClangTidyOptions ClangTidyOptions::getDefaults() {
+  ClangTidyOptions Options;
+  Options.Checks = "";
+  Options.HeaderFilterRegex = "";
+  Options.AnalyzeTemporaryDtors = false;
+  Options.User = llvm::None;
+  for (ClangTidyModuleRegistry::iterator I = ClangTidyModuleRegistry::begin(),
+                                         E = ClangTidyModuleRegistry::end();
+       I != E; ++I)
+    Options = Options.mergeWith(I->instantiate()->getModuleOptions());
+  return Options;
+}
+
 ClangTidyOptions
 ClangTidyOptions::mergeWith(const ClangTidyOptions &Other) const {
   ClangTidyOptions Result = *this;