CI: Enforce newline at end of files

Reference:
  https://medium.com/@alexey.inkin/how-to-force-newline-at-end-of-files-and-why-you-should-do-it-fdf76d1d090e

Author: jserv

.ci/check-newline.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+ret=0
+show=0
+# Reference: https://medium.com/@alexey.inkin/how-to-force-newline-at-end-of-files-and-why-you-should-do-it-fdf76d1d090e
+while IFS= read -rd '' f; do
+    if file --mime-encoding "$f" | grep -qv binary; then
+        tail -c1 < "$f" | read -r _ || show=1
+        if [ $show -eq 1 ]; then
+            echo "Warning: No newline at end of file $f"
+            ret=1
+            show=0
+        fi
+    fi
+done < <(git ls-files -z src tools tests)
+
+exit $ret

.github/workflows/main.yml

@@ -30,5 +30,6 @@ jobs:
     - name: coding convention
       run: |
             sudo apt-get install -q -y clang-format-12
-            sh .ci/check-format.sh
+            .ci/check-newline.sh
+            .ci/check-format.sh
       shell: bash