Allow newline characters as separators for checks in Clang-Tidy configurations

This is a fix for llvm#53737. In addition to commas, newline characters are
considered as separators of checks.

Author: SimplyDanny

clang-tools-extra/clang-tidy/GlobList.cpp

@@ -27,7 +27,7 @@ static bool consumeNegativeIndicator(StringRef &GlobList) {
 // Converts first glob from the comma-separated list of globs to Regex and
 // removes it and the trailing comma from the GlobList.
 static llvm::Regex consumeGlob(StringRef &GlobList) {
-  StringRef UntrimmedGlob = GlobList.substr(0, GlobList.find(','));
+  StringRef UntrimmedGlob = GlobList.substr(0, GlobList.find_first_of(",\n"));
   StringRef Glob = UntrimmedGlob.trim();
   GlobList = GlobList.substr(UntrimmedGlob.size() + 1);
   SmallString<128> RegexText("^");
@@ -44,7 +44,7 @@ static llvm::Regex consumeGlob(StringRef &GlobList) {
 }
 
 GlobList::GlobList(StringRef Globs, bool KeepNegativeGlobs /* =true */) {
-  Items.reserve(Globs.count(',') + 1);
+  Items.reserve(Globs.count(',') + Globs.count('\n') + 1);
   do {
     GlobListItem Item;
     Item.IsPositive = !consumeNegativeIndicator(Globs);

clang-tools-extra/unittests/clang-tidy/ClangTidyOptionsTest.cpp

@@ -86,6 +86,20 @@ TEST(ParseConfiguration, ValidConfiguration) {
   EXPECT_EQ("some.user", *Options->User);
 }
 
+TEST(ParseConfiguration, ChecksSeparatedByNewlines) {
+  auto MemoryBuffer = llvm::MemoryBufferRef("Checks: |\n"
+                                            "  -*,misc-*\n"
+                                            "  llvm-*\n"
+                                            "  -clang-*,\n"
+                                            "  google-*",
+                                            "Options");
+
+  auto Options = parseConfiguration(MemoryBuffer);
+
+  EXPECT_TRUE(!!Options);
+  EXPECT_EQ("-*,misc-*\nllvm-*\n-clang-*,\ngoogle-*\n", *Options->Checks);
+}
+
 TEST(ParseConfiguration, MergeConfigurations) {
   llvm::ErrorOr<ClangTidyOptions> Options1 =
       parseConfiguration(llvm::MemoryBufferRef(R"(

clang-tools-extra/unittests/clang-tidy/GlobListTest.cpp

@@ -104,5 +104,18 @@ TYPED_TEST(GlobListTest, Complex) {
   EXPECT_TRUE(Filter.contains("asdfqwEasdf"));
 }
 
+TYPED_TEST(GlobListTest, NewlineCharactersAsSeparators) {
+  TypeParam Filter("a*  \n b,\n-c*,dd");
+
+  EXPECT_FALSE(Filter.contains(""));
+  EXPECT_TRUE(Filter.contains("aaa"));
+  EXPECT_TRUE(Filter.contains("b"));
+  EXPECT_FALSE(Filter.contains("c"));
+  EXPECT_FALSE(Filter.contains("ccc"));
+  EXPECT_FALSE(Filter.contains("d"));
+  EXPECT_TRUE(Filter.contains("dd"));
+  EXPECT_FALSE(Filter.contains("ddd"));
+}
+
 } // namespace tidy
 } // namespace clang