diff --git a/get-pr-changed-files b/get-pr-changed-files
new file mode 100755
index 000000000000..29ab09b2e8f4
--- /dev/null
+++ b/get-pr-changed-files
@@ -0,0 +1,2 @@
+#!/bin/bash
+curl -s -L https://patch-diff.githubusercontent.com/raw/cms-sw/$1/pull/$2.patch | grep '^diff --git ' | sed 's|.* a/||;s|  *b/.*||' | sort | uniq
diff --git a/run-pr-format b/run-pr-format
new file mode 100755
index 000000000000..190fca27aba4
--- /dev/null
+++ b/run-pr-format
@@ -0,0 +1,25 @@
+#!/bin/bash -ex
+PULL_REQUEST=$1
+CMS_BOT_DIR=$(dirname $0)
+case $CMS_BOT_DIR in /*) ;; *) CMS_BOT_DIR=$(pwd)/${CMS_BOT_DIR} ;; esac
+if [ "X${WORKSPACE}" = "X" ] ; then WORKSPACE=$(pwd) ; fi
+
+NUM_PROC=$(getconf _NPROCESSORS_ONLN)
+cd $CMSSW_BASE/src
+git cms-merge-topic -u ${PULL_REQUEST}
+scram build -j ${NUM_PROC} llvm-ccdb
+rm -rf ${CMSSW_BASE}/pr-changed-files-all.log ${CMSSW_BASE}/pr-changed-files-selected.log
+${CMS_BOT_DIR}/get-pr-changed-files cmssw ${PULL_REQUEST} > ${CMSSW_BASE}/pr-changed-files-all.log
+touch ${CMSSW_BASE}/pr-changed-files-selected.log
+for f in $(cat ${CMSSW_BASE}/pr-changed-files-all.log | grep -v '/test/') ; do
+  if [ $(grep "/src/$f\"" $CMSSW_BASE/compile_commands.json | wc -l) -gt 0 ] ; then 
+    echo $f >> ${CMSSW_BASE}/pr-changed-files-selected.log
+  fi
+done
+USER_CODE_CHECK_FILES=$(cat ${CMSSW_BASE}/pr-changed-files-selected.log | tr '\n' ' ')
+if [ "${USER_CODE_CHECK_FILES}" != "" ] ; then 
+  export USER_STYLE_CHECKS='boost-use-to-string,misc-string-compare,misc-uniqueptr-reset-release,modernize-deprecated-headers,modernize-make-shared,modernize-use-bool-literals,modernize-use-equals-delete,modernize-use-nullptr,modernize-use-override,performance-unnecessary-copy-initialization,readability-container-size-empty,readability-redundant-string-cstr,readability-static-definition-in-anonymous-namespace,readability-uniqueptr-delete-release'
+  export USER_CODE_CHECK_FILES
+  scram build -j ${NUM_PROC} style > ${WORKSPACE}/clang-tidy.log 2>&1
+  git diff > ${WORKSPACE}/${PULL_REQUEST}.diff
+fi