Add possibility to exclude files/directories from check

Exclude code from directory analysis/PWGDIL/dielectron/papaframework.
The code of the papa framework currently has its own license header since the
code was original developed for the ALICE collaboration before the original
author copied the code also to CbmRoot.

scripts/check-licence-header.sh

@@ -3,6 +3,18 @@
 # SPDX-License-Identifier: GPL-3.0-only
 # First commited by Eoin Clerkin
 
+
+# In the array excludes all directories and/or files are listed which shouldn't be
+# tested if they habe the proper license statement.
+# For all the directories/files listed in the array an explanation should be given.
+
+excludes=(
+# The directory is excluded since the files have a license header
+# inherited from the ALICE experiment. The code was copied by the
+# original author when he started working for CBM.
+papaframework
+)
+
 RETURN_CODE="0"
 
 licenceHeaderCheck () {
@@ -43,7 +55,7 @@ licenceHeaderCheck () {
 
 
 if [ $# -eq 1 ]; then
-UPSTREAM=$1	
+  UPSTREAM=$1
 else
   if [ -z $UPSTREAM ]; then
     UPSTREAM=$(git remote -v | grep git.cbm.gsi.de[:/]computing/cbmroot | cut -f1 | uniq)
@@ -56,20 +68,24 @@ else
   fi
 fi
 
-
-
-if [ -f $1 ]; then 
-CHANGED_FILES="$1"
-echo "LICENCE HEADER CHECK FOR FILE: $1"
+if [ -f $1 ]; then
+  CHANGED_FILES="$1"
+  echo "LICENCE HEADER CHECK FOR FILE: $1"
 else
-echo "Upstream name is :" $UPSTREAM
-BASE_COMMIT=$UPSTREAM/master
-CHANGED_FILES=$(git diff --name-only $BASE_COMMIT | egrep '\.cxx$|\.h|\.C$')
+  echo "Upstream name is :" $UPSTREAM
+  BASE_COMMIT=$UPSTREAM/master
+  CHANGED_FILES=$(git diff --name-only $BASE_COMMIT | egrep '\.cxx$|\.h|\.C$')
 fi
 
-
+# Exclude files which shouldn't be tested
+# Check the license header for all other files
 for FILE in $CHANGED_FILES; do
-	licenceHeaderCheck $FILE
+  for EXCLUDE in "${excludes[@]}"; do
+    FILE=$(echo $FILE | egrep -v "$EXCLUDE")
+  done
+  if [[ -n $FILE ]]; then
+    licenceHeaderCheck $FILE
+  fi
 done
 
 if [ $RETURN_CODE -eq "0" ]; then
@@ -78,6 +94,4 @@ else
 	echo "[FAIL] Visit https://redmine.cbm.gsi.de/projects/cbmroot/wiki/Licence for information on correct syntax for licence header."
 fi
 
-
-
 exit $RETURN_CODE;