check-fmt: compare with CR stripped (CRLF-safe on any runner)

Author: turinglambdaai

test/check-fmt.sh

@@ -1,13 +1,17 @@
 #!/usr/bin/env bash
 # Fail if any Racket source file is not formatted with `raco fmt` (width 102).
+# Comparison ignores CR so the check works on any platform's checkout
+# line-ending convention.
 # Run: bash test/check-fmt.sh
 set -u
 
 fail=0
 files=(main.rkt info.rkt private/*.rkt examples/*.rkt test/*.rkt)
 
 for f in "${files[@]}"; do
-  if ! raco fmt --width 102 "$f" 2>/dev/null | diff -q - "$f" >/dev/null 2>&1; then
+  fmt_out=$(raco fmt --width 102 "$f" 2>/dev/null | tr -d '\r')
+  file_out=$(tr -d '\r' < "$f")
+  if [ "$fmt_out" != "$file_out" ]; then
     echo "NOT FORMATTED: $f  (run: raco fmt -i --width 102 $f)"
     fail=1
   fi