Meta: Add a script that makes sure files end in a newline.

This script checks .html, .css, .js, .cpp, .h, .gml and .sh files.

It also makes sure that there are no black lines at the end of the
files checked.

Meta/check-newlines-at-eof.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+cd "$script_path/.." || exit 1
+
+MISSING_NEWLINE_AT_EOF_ERRORS=()
+MORE_THAN_ONE_NEWLINE_AT_EOF_ERRORS=()
+
+while IFS= read -r f; do
+    [ -s "$f" ] || continue
+
+    if [ "$(tail -n 1 "$f" | wc -l)" != 1 ]; then
+        MISSING_NEWLINE_AT_EOF_ERRORS+=( "$f" )
+    elif [[ "$(tail -n 1 "$f")" =~ ^[[:space:]]*$ ]]; then
+        MORE_THAN_ONE_NEWLINE_AT_EOF_ERRORS+=( "$f" )
+    fi
+done < <(git ls-files -- \
+    '*.cpp' \
+    '*.h' \
+    '*.gml' \
+    '*.html' \
+    '*.js' \
+    '*.css' \
+    '*.sh' \
+    ':!:Base' \
+    ':!:Kernel/FileSystem/ext2_fs.h' \
+    ':!:Libraries/LibC/getopt.cpp' \
+    ':!:Libraries/LibCore/puff.h' \
+    ':!:Libraries/LibCore/puff.cpp' \
+    ':!:Libraries/LibELF/exec_elf.h' \
+)
+
+exit_status=0
+if (( ${#MISSING_NEWLINE_AT_EOF_ERRORS[@]} )); then
+    echo "Files with no newline at the end: ${MISSING_NEWLINE_AT_EOF_ERRORS[*]}"
+    exit_status=1
+fi
+if (( ${#MORE_THAN_ONE_NEWLINE_AT_EOF_ERRORS[@]} )); then
+    echo "Files that have blank lines at the end: ${MORE_THAN_ONE_NEWLINE_AT_EOF_ERRORS[*]}"
+    exit_status=1
+fi
+exit "$exit_status"

Meta/lint-ci.sh

@@ -16,6 +16,7 @@ set +e
 for cmd in \
         Meta/check-ak-test-files.sh \
         Meta/check-debug-flags.sh \
+        Meta/check-newlines-at-eof.sh \
         Meta/check-style.sh \
         Meta/lint-executable-resources.sh \
         Meta/lint-ipc-ids.sh \