Shorten the output of `clang-format --version`, include revision number.

Before:
  $ clang-format  --version
  LLVM (http://llvm.org/):
    LLVM version 3.5svn
    Optimized build with assertions.
    Built Jan  3 2014 (14:28:46).
    Default target: x86_64-apple-darwin13.0.0
    Host CPU: core-avx-i

Now:
  $ bin/clang-format --version
  clang-format version 3.5 (198452)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198694 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/clang-format/ClangFormat.cpp b/tools/clang-format/ClangFormat.cpp
index 28ff5c1335..9744609073 100644
--- a/tools/clang-format/ClangFormat.cpp
+++ b/tools/clang-format/ClangFormat.cpp
@@ -17,6 +17,7 @@
 #include "clang/Basic/DiagnosticOptions.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/SourceManager.h"
+#include "clang/Basic/Version.h"
 #include "clang/Format/Format.h"
 #include "clang/Lex/Lexer.h"
 #include "clang/Rewrite/Core/Rewriter.h"
@@ -255,6 +256,11 @@ static bool format(StringRef FileName) {
 }  // namespace format
 }  // namespace clang
 
+static void PrintVersion() {
+  raw_ostream &OS = outs();
+  OS << clang::getClangToolFullVersion("clang-format") << '\n';
+}
+
 int main(int argc, const char **argv) {
   llvm::sys::PrintStackTraceOnErrorSignal();
 
@@ -268,6 +274,7 @@ int main(int argc, const char **argv) {
       I->second->setHiddenFlag(cl::ReallyHidden);
   }
 
+  cl::SetVersionPrinter(PrintVersion);
   cl::ParseCommandLineOptions(
       argc, argv,
       "A tool to format C/C++/Obj-C code.\n\n"