Merge pull request #2468 from OlegHahm/make_travis_whining_about_trailing_whitespaces_are_a_nono

Make travis whining about trailing whitespaces are a nono

.travis.yml

@@ -44,6 +44,8 @@ script:
     - make -s -C ./examples/default info-concurrency
     - git rebase riot/master || git rebase --abort
 
+    - ./dist/tools/whitespacecheck/check.sh master || exit
+
     - ./dist/tools/licenses/check.sh master --diff-filter=MR --error-exitcode=0 || exit
     - ./dist/tools/licenses/check.sh master --diff-filter=AC || exit
 

dist/tools/whitespacecheck/check.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+# Copyright 2015 Oliver Hahm <oliver.hahm@inria.fr>
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+# If no branch but an option is given, unset BRANCH.
+# Otherwise, consume this parameter.
+BRANCH="${1}"
+if echo "${BRANCH}" | grep -q '^-'; then
+    if [ $(git rev-parse --abbrev-ref HEAD) != "master" ]; then
+        BRANCH="master"
+    else
+        BRANCH=""
+    fi
+else
+    if [ -n "${BRANCH}" ]; then
+        shift 1
+    fi
+fi
+
+
+# select files to check
+if [ -z "${BRANCH}" ]; then
+    BRANCH=$(git rev-list HEAD | tail -n 1)
+fi
+
+git diff --check $(git merge-base ${BRANCH} HEAD) > /dev/null
+if [ $? -gt 0 ]
+then
+    echo "ERROR: This change introduces new whitespace errors"
+    exit 1
+else
+    exit 0
+fi