Reapply r236854 and fixed r236867.

Makes emacs show a different message when clang-format encountered a
syntax error.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@236943 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 4 deletions

diff --git a/tools/clang-format/ClangFormat.cpp b/tools/clang-format/ClangFormat.cpp
index fe7d678852..5037e901f3 100644
--- a/tools/clang-format/ClangFormat.cpp
+++ b/tools/clang-format/ClangFormat.cpp
@@ -225,14 +225,18 @@ static bool format(StringRef FileName) {
 
   FormatStyle FormatStyle = getStyle(
       Style, (FileName == "-") ? AssumeFilename : FileName, FallbackStyle);
-  tooling::Replacements Replaces = reformat(FormatStyle, Sources, ID, Ranges);
+  bool IncompleteFormat = false;
+  tooling::Replacements Replaces =
+      reformat(FormatStyle, Sources, ID, Ranges, &IncompleteFormat);
   if (OutputXML) {
-    llvm::outs()
-        << "<?xml version='1.0'?>\n<replacements xml:space='preserve'>\n";
+    llvm::outs() << "<?xml version='1.0'?>\n<replacements "
+                    "xml:space='preserve' incomplete_format='"
+                 << (IncompleteFormat ? "true" : "false") << "'>\n";
     if (Cursor.getNumOccurrences() != 0)
       llvm::outs() << "<cursor>"
                    << tooling::shiftedCodePosition(Replaces, Cursor)
                    << "</cursor>\n";
+
     for (tooling::Replacements::const_iterator I = Replaces.begin(),
                                                E = Replaces.end();
          I != E; ++I) {
@@ -254,7 +258,9 @@ static bool format(StringRef FileName) {
     } else {
       if (Cursor.getNumOccurrences() != 0)
         outs() << "{ \"Cursor\": "
-               << tooling::shiftedCodePosition(Replaces, Cursor) << " }\n";
+               << tooling::shiftedCodePosition(Replaces, Cursor)
+               << ", \"IncompleteFormat\": "
+               << (IncompleteFormat ? "true" : "false") << " }\n";
       Rewrite.getEditBuffer(ID).write(outs());
     }
   }