[llvm] [llvm-diff] Add colorful output to diff (PR #131012)

[via llvm-commits]

https://github.com/Bertik23 updated https://github.com/llvm/llvm-project/pull/131012

>From ecb9b0bf2dae6a02942a78800b4296e9da88c287 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Albert=20Havli=C4=8Dek?= <havlialb at fit.cvut.cz>
Date: Thu, 13 Mar 2025 08:44:08 +0100
Subject: [PATCH] [llvm-diff] Color for differences between left and right

---
 llvm/tools/llvm-diff/lib/DiffConsumer.cpp | 27 ++++++++++++++---------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/llvm/tools/llvm-diff/lib/DiffConsumer.cpp b/llvm/tools/llvm-diff/lib/DiffConsumer.cpp
index b6eb71916acf9..5ff9b3d76ac98 100644
--- a/llvm/tools/llvm-diff/lib/DiffConsumer.cpp
+++ b/llvm/tools/llvm-diff/lib/DiffConsumer.cpp
@@ -14,6 +14,8 @@
 #include "llvm/IR/Instructions.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/WithColor.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
@@ -199,20 +201,23 @@ void DiffConsumer::logd(const DiffLogBuilder &Log) {
     switch (Log.getLineKind(I)) {
     case DC_match:
       out << "  ";
-      Log.getLeft(I)->print(dbgs()); dbgs() << '\n';
-      //printValue(Log.getLeft(I), true);
+      Log.getLeft(I)->print(dbgs());
+      dbgs() << '\n';
       break;
-    case DC_left:
-      out << "< ";
-      Log.getLeft(I)->print(dbgs()); dbgs() << '\n';
-      //printValue(Log.getLeft(I), true);
+    case DC_left: {
+      auto LeftColor = llvm::WithColor(out, raw_ostream::RED);
+      LeftColor << "< ";
+      Log.getLeft(I)->print(LeftColor);
+      LeftColor << '\n';
       break;
-    case DC_right:
-      out << "> ";
-      Log.getRight(I)->print(dbgs()); dbgs() << '\n';
-      //printValue(Log.getRight(I), false);
+    }
+    case DC_right: {
+      auto RightColor = llvm::WithColor(out, raw_ostream::GREEN);
+      RightColor << "> ";
+      Log.getRight(I)->print(RightColor);
+      RightColor << '\n';
       break;
     }
-    //out << "\n";
+    }
   }
 }