================
@@ -570,6 +571,74 @@ static int dumpConfig(bool IsSTDIN) {
return 0;
}
+// Check whether `FilePath` is ignored according to the nearest
+// .clang-format-ignore file based on the rules below:
+// - A blank line is skipped.
+// - Leading and trailing spaces of a line are trimmed.
+// - A line starting with a hash (`#`) is a comment.
+// - A non-comment line is a single pattern.
+// - The slash (`/`) is used as the directory separator.
+// - A pattern is relative to the directory of the .clang-format-ignore file
(or
+// the root directory if the pattern starts with a slash).
+// - A pattern is negated if it starts with a bang (`!`).
+static bool isIgnored(StringRef FilePath) {
+ using namespace llvm::sys::fs;
+ if (!is_regular_file(FilePath))
+ return false;
+
+ using namespace llvm::sys::path;
+ SmallString<128> Path, AbsPath{FilePath};
+
+ make_absolute(AbsPath);
+ remove_dots(AbsPath, /*remove_dot_dot=*/true);
+
+ StringRef IgnoreDir{AbsPath};
+ do {
+ IgnoreDir = parent_path(IgnoreDir);
+ if (IgnoreDir.empty())
+ return false;
+
+ Path = IgnoreDir;
+ append(Path, ".clang-format-ignore");
+ } while (!is_regular_file(Path));
+
+ std::ifstream IgnoreFile{Path.c_str()};
+ if (!IgnoreFile.good())
+ return false;
+
+ AbsPath = convert_to_slash(AbsPath);
+
+ bool HasMatch = false;
+ for (std::string Pattern; std::getline(IgnoreFile, Pattern);) {
+ Pattern = StringRef(Pattern).trim();
----------------
owenca wrote:
I converted back to `std::string` because `StringRef` doesn't have `erase()`.
However, I can use `drop_front()`.
https://github.com/llvm/llvm-project/pull/76327
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