[travis] check/fix EOF newline on pretty/pretty-check (#3671)

script/clang-format-check.sh

@@ -35,7 +35,21 @@
 
 set -x
 
+die() {
+    echo " *** ERROR: " $*
+    exit 1
+}
+
 # from `man diff`:
 # Exit status is 0 if inputs are the same, 1 if different, 2 if trouble.
 
-$(dirname "$0")/clang-format.sh -style=file $@  | diff -u $@ -
+$(dirname "$0")/clang-format.sh -style=file $@  | diff -u $@ - || die
+
+for arg; do true; done
+file=$arg
+[ -n "$(tail -c1 $file)" ] && {
+    echo " *** ERROR: Missing EOF newline: " $file
+    exit 1
+}
+
+exit 0

script/clang-format.sh

@@ -48,4 +48,23 @@ else
     die "clang-format 6.0 required"
 fi
 
-clang-format $@
+clang-format $@ || die
+
+# ensure EOF newline
+REPLACE=no
+for arg
+do
+    case $arg in
+        -i)
+            REPLACE=yes
+            ;;
+    esac
+done
+
+file=$arg
+
+[ $REPLACE != yes ] || {
+    [ -n "$(tail -c1 $file)" ] && echo >> $file
+}
+
+exit 0