Added an option to specify fallback style.

Summary:
Added -fallback-style option. Changed clang-format to stop searching
for .clang-format when an invalid file is found.

Reviewers: djasper, klimek

Reviewed By: djasper

CC: cfe-commits, klimek

Differential Revision: http://llvm-reviews.chandlerc.com/D2292

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@196108 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 3 deletions

diff --git a/tools/clang-format/ClangFormat.cpp b/tools/clang-format/ClangFormat.cpp
index 768165b92e..513439649d 100644
--- a/tools/clang-format/ClangFormat.cpp
+++ b/tools/clang-format/ClangFormat.cpp
@@ -62,6 +62,12 @@ static cl::opt<std::string>
     Style("style",
           cl::desc(clang::format::StyleOptionHelpDescription),
           cl::init("file"), cl::cat(ClangFormatCategory));
+static cl::opt<std::string>
+FallbackStyle("fallback-style",
+              cl::desc("The name of the predefined style used as a fallback in "
+                       "case clang-format is invoked with -style=file, but can "
+                       "not find the .clang-format file to use."),
+              cl::init("LLVM"), cl::cat(ClangFormatCategory));
 
 static cl::opt<std::string>
 AssumeFilename("assume-filename",
@@ -192,8 +198,8 @@ static bool format(StringRef FileName) {
   if (fillRanges(Sources, ID, Code.get(), Ranges))
     return true;
 
-  FormatStyle FormatStyle =
-      getStyle(Style, (FileName == "-") ? AssumeFilename : FileName);
+  FormatStyle FormatStyle = getStyle(
+      Style, (FileName == "-") ? AssumeFilename : FileName, FallbackStyle);
   Lexer Lex(ID, Sources.getBuffer(ID), Sources,
             getFormattingLangOpts(FormatStyle.Standard));
   tooling::Replacements Replaces = reformat(FormatStyle, Lex, Sources, Ranges);
@@ -256,7 +262,8 @@ int main(int argc, const char **argv) {
   if (DumpConfig) {
     std::string Config =
         clang::format::configurationAsText(clang::format::getStyle(
-            Style, FileNames.empty() ? AssumeFilename : FileNames[0]));
+            Style, FileNames.empty() ? AssumeFilename : FileNames[0],
+            FallbackStyle));
     llvm::outs() << Config << "\n";
     return 0;
   }