Check if the last line is terminated by a <newline> character

According to the Posix standard a line of a text is defined as follows:

3.206 Line
A sequence of zero or more non- <newline> characters plus a terminating
<newline> character.

The test checks if this is valid for all newly added or changed text files.

I stumbeled over the issue when adding a new header file the list of header
files used to generate a ROOT dictionary.
The previous last file of the list did not have a proper file ending and
attaching the new header file results in a ROOT dictionary source code with
the following line

'#endif#ifdef'

which could be properly parsed and compiled by the compiler but results in an
error at run time when loading the library.

To avoid such problems in future the test was added.

.gitlab-ci.yml

@@ -111,6 +111,24 @@ FileFormatCheck:
     - git fetch upstream
     - scripts/check-file-format.sh upstream
 
+FileEndCheck:
+  stage: checkFormat
+  image: alpine
+  tags:
+    - docker
+  only:
+    refs:
+      - merge_requests
+    variables:
+      - $CI_MERGE_REQUEST_PROJECT_PATH == "computing/cbmroot" && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME == "master"
+  script:
+    # Get the upstream repository manually. I did not find any other way to have it for
+    # comparison
+    - apk update && apk add git bash file
+    - scripts/connect_upstream_repo.sh $CI_MERGE_REQUEST_PROJECT_URL
+    - git fetch upstream
+    - scripts/check-file-ending.sh upstream
+
 CbmRoot_Continuous:
   stage: build
   tags:

scripts/check-file-ending.sh

+#!/bin/bash
+
+if [[ $# -eq 1 ]]; then
+  UPSTREAM=$1
+else
+  if [ -z $UPSTREAM ]; then
+    UPSTREAM=$(git remote -v | grep git.cbm.gsi.de[:/]computing/cbmroot | cut -f1 | uniq)
+    if [ -z $UPSTREAM ]; then
+      echo "Error: Name of upstream repository not provided and not found by automatic means"
+      echo 'Please provide if by checking your remotes with "git remote -v" and exporting UPSTREAM'
+      echo "or passing as an argument"
+      exit -1
+    fi
+  fi
+fi  
+echo "Upstream name is :" $UPSTREAM
+
+
+# If one wants to find all files in the CbmRoot and not only the changed ones
+# uncomment the follwing line and comment the next two
+#CHANGED_FILES=$(find . -type f -not \( -path "./.git/*" -o -path "./geometry/*" -o -path "./input/*" -o -path "./external/*" -o -path "./parameters/*" -prune \))
+
+BASE_COMMIT=$UPSTREAM/master
+CHANGED_FILES=$(git diff --name-only $BASE_COMMIT)
+
+echo ""
+for file in $CHANGED_FILES; do
+
+  # First check for text files and only do the further test on line endings
+  # for text files
+  result=$(file $file | grep -v text)
+  if [[ -z $result ]]; then
+    if [[ $(tail -c 1 $file) ]]; then
+      echo "File $file does not finish with end of line"
+      okay=false
+    fi
+  fi    
+done
+
+if [[ "$okay" = "false" ]]; then
+  echo ""
+  echo "Not all files have the correct file ending"
+  echo "Test failed"
+  echo ""
+  exit 1
+else
+  exit 0
+fi
+