[llvm] [llvm-lit] Process ANSI color codes in test output when formatting (PR #106776)

[Alexander Richardson via llvm-commits]

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@@ -1005,6 +1005,44 @@ def _executeShCmd(cmd, shenv, results, timeoutHelper):
     return exitCode
 
 
+def reFindLast(r, s):
+    matches = r.findall(s)
+    if not matches:
+        return None
+    return matches[-1]
+
+
+def findColor(s, curr_color):
+    m = reFindLast(color_re, s)
+    if not m:
+        return curr_color
+    # "\33[0m" means "reset all formatting". Sometimes the 0 is skipped.
+    if m == "\33[m" or m == "\33[0m":
+        return None
+    return m
+
+
+def escapeColor(s, f):
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arichardson wrote:

Also since this is just a single if statement and is called exactly once, I don't think it needs to be separate function.

https://github.com/llvm/llvm-project/pull/106776