Add script to test for tabs in commit range

In order to prevent violations of the coding style in ompi it was
decided to check any future PRs for white space violations. This script
checks whether a certain commit range has introduced a tab character.

See open-mpi/ompi#6831 for details.

Signed-off-by: guserav <[email protected]>

Author: guserav

jenkins/whitespace-checker.sh

@@ -0,0 +1,32 @@
+#! /usr/bin/env bash
+#
+# Copyright (c) 2019      Hewlett Packard Enterprise. All Rights Reserved.
+#
+# Additional copyrights may follow
+#
+# Check for white space violation in a given commit range.
+# Run on a PR to check whether it is introducing bad white space.
+#
+
+context=3
+config_file=.whitespace-checker-config.txt
+if [[ -r $config_file ]]; then
+    exclude_dirs=`cat $config_file`
+else
+    exclude_dirs='hwloc|libevent|pmix4x|treematch|romio'
+fi
+
+foundTab=0
+for file in $(git diff --name-only $1 $2 | grep -vE "/($exclude_dirs)/" | grep -E "(\.c|\.h)$")
+do
+    git diff $1 $2 -- $file | grep -C $context -E "^\+.*	+"
+    if [[ $? -eq 0 ]]
+    then
+        foundTab=1
+    fi
+done
+
+if [[ $foundTab -ne 0 ]]
+then
+    exit 1
+fi