chore(scripts/list-attributes.sh): script to track attributes semired…

…ucible/irreducible (#18165)

This script generates the data for #18164

scripts/list-attributes.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+# This script generates the data for mathlib#18164
+
+URL_BASE="https://github.com/leanprover-community/mathlib/blob"
+SHA=$(git rev-parse HEAD)
+
+IFS=":"
+git grep -n "local attribute \[semireducible\]\|attribute \[irreducible\]" | \
+	grep -v 'src/tactic\|src/meta\|test' | \
+	while read fn ln rest; do
+		grep --silent "SYNCHRONIZED WITH MATHLIB4" $fn || \
+			echo "$URL_BASE/$SHA/$fn#L$ln"
+	done
+