Update lint_xrefs.sh

Author: shoumikhin

scripts/lint_xrefs.sh

@@ -34,12 +34,17 @@ done < <(
     ':(exclude,glob)**/third-party/**'
     ':(exclude,glob)**/third_party/**'
   )
-  if [ $# -gt 0 ]; then
-    paths=("$@")
+  if [ $# -eq 2 ]; then
+    for filename in $(git diff --name-only --unified=0 "$1...$2"); do
+      git diff --unified=0 "$1...$2" -- "$filename" "${excludes[@]}" \
+        | grep -E '^\+' \
+        | grep -Ev '^\+\+\+' \
+        | perl -nle 'print for m#'"$pattern"'#g' \
+        | sed 's|^|'"$filename"':|'
+    done
   else
-    paths=('*')
-  fi
-  git --no-pager grep --no-color -I -P -o "$pattern" -- "${paths[@]}" "${excludes[@]}" \
+    git --no-pager grep --no-color -I -P -o "$pattern" -- . "${excludes[@]}"
+  fi \
   | grep -Ev 'https?://' \
   | sed -E \
       -e 's#([^:]+):\[[^]]+\]\(([^)]+)\)#\1:\2#' \