[clang-format] append newline after code when inserting new headers a…

…t the end of the code which does not end with newline.

Summary:
append newline after code when inserting new headers at the end of the
code which does not end with newline.

Reviewers: djasper

Subscribers: cfe-commits, klimek

Differential Revision: https://reviews.llvm.org/D21026

llvm-svn: 283330

clang/lib/Format/Format.cpp

@@ -1662,6 +1662,7 @@ fixCppIncludeInsertions(StringRef Code, const tooling::Replacements &Replaces,
     if (CategoryEndOffsets.find(*I) == CategoryEndOffsets.end())
       CategoryEndOffsets[*I] = CategoryEndOffsets[*std::prev(I)];
 
+  bool NeedNewLineAtEnd = !Code.empty() && Code.back() != '\n';
   for (const auto &R : HeaderInsertions) {
     auto IncludeDirective = R.getReplacementText();
     bool Matched = IncludeRegex.match(IncludeDirective, &Matches);
@@ -1680,10 +1681,18 @@ fixCppIncludeInsertions(StringRef Code, const tooling::Replacements &Replaces,
     std::string NewInclude = !IncludeDirective.endswith("\n")
                                  ? (IncludeDirective + "\n").str()
                                  : IncludeDirective.str();
+    // When inserting headers at end of the code, also append '\n' to the code
+    // if it does not end with '\n'.
+    if (NeedNewLineAtEnd && Offset == Code.size()) {
+      NewInclude = "\n" + NewInclude;
+      NeedNewLineAtEnd = false;
+    }
     auto NewReplace = tooling::Replacement(FileName, Offset, 0, NewInclude);
     auto Err = Result.add(NewReplace);
     if (Err) {
       llvm::consumeError(std::move(Err));
+      unsigned NewOffset = Result.getShiftedCodePosition(Offset);
+      NewReplace = tooling::Replacement(FileName, NewOffset, 0, NewInclude);
       Result = Result.merge(tooling::Replacements(NewReplace));
     }
   }

clang/unittests/Format/CleanupTest.cpp

@@ -709,16 +709,24 @@ TEST_F(CleanUpReplacementsTest, EmptyCode) {
   EXPECT_EQ(Expected, apply(Code, Replaces));
 }
 
-// FIXME: although this case does not crash, the insertion is wrong. A '\n'
-// should be inserted between the two #includes.
 TEST_F(CleanUpReplacementsTest, NoNewLineAtTheEndOfCode) {
   std::string Code = "#include <map>";
-  std::string Expected = "#include <map>#include <vector>\n";
+  std::string Expected = "#include <map>\n#include <vector>\n";
   tooling::Replacements Replaces =
       toReplacements({createInsertion("#include <vector>")});
   EXPECT_EQ(Expected, apply(Code, Replaces));
 }
 
+TEST_F(CleanUpReplacementsTest, NoNewLineAtTheEndOfCodeMultipleInsertions) {
+  std::string Code = "#include <map>";
+  std::string Expected =
+      "#include <map>\n#include <string>\n#include <vector>\n";
+  tooling::Replacements Replaces =
+      toReplacements({createInsertion("#include <string>"),
+                      createInsertion("#include <vector>")});
+  EXPECT_EQ(Expected, apply(Code, Replaces));
+}
+
 TEST_F(CleanUpReplacementsTest, SkipExistingHeaders) {
   std::string Code = "#include \"a.h\"\n"
                      "#include <vector>\n";