Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/tools/llvm-cov/RenderingSupport.h

@@ -0,0 +1,61 @@
+//===- RenderingSupport.h - output stream rendering support functions  ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_COV_RENDERINGSUPPORT_H
+#define LLVM_COV_RENDERINGSUPPORT_H
+
+#include "llvm/Support/raw_ostream.h"
+#include <utility>
+
+namespace llvm {
+
+/// \brief A helper class that resets the output stream's color if needed
+/// when destroyed.
+class ColoredRawOstream {
+  ColoredRawOstream(const ColoredRawOstream &OS) = delete;
+
+public:
+  raw_ostream &OS;
+  bool IsColorUsed;
+
+  ColoredRawOstream(raw_ostream &OS, bool IsColorUsed)
+      : OS(OS), IsColorUsed(IsColorUsed) {}
+
+  ColoredRawOstream(ColoredRawOstream &&Other)
+      : OS(Other.OS), IsColorUsed(Other.IsColorUsed) {
+    // Reset the other IsColorUsed so that the other object won't reset the
+    // color when destroyed.
+    Other.IsColorUsed = false;
+  }
+
+  ~ColoredRawOstream() {
+    if (IsColorUsed)
+      OS.resetColor();
+  }
+};
+
+template <typename T>
+inline raw_ostream &operator<<(const ColoredRawOstream &OS, T &&Value) {
+  return OS.OS << std::forward<T>(Value);
+}
+
+/// \brief Change the color of the output stream if the `IsColorUsed` flag
+/// is true. Returns an object that resets the color when destroyed.
+inline ColoredRawOstream colored_ostream(raw_ostream &OS,
+                                         raw_ostream::Colors Color,
+                                         bool IsColorUsed = true,
+                                         bool Bold = false, bool BG = false) {
+  if (IsColorUsed)
+    OS.changeColor(Color, Bold, BG);
+  return ColoredRawOstream(OS, IsColorUsed);
+}
+
+} // namespace llvm
+
+#endif // LLVM_COV_RENDERINGSUPPORT_H