Meta: Add script to enforce license headers & run it on Travis

.travis.yml

@@ -34,6 +34,7 @@ script:
 - cd ../Kernel
 - ./makeall.sh
 - ../Meta/lint-shell-scripts.sh
+- ../Meta/check-license-headers.sh
 - ../Meta/Lagom/build-js.sh
 - cd ../Libraries/LibJS/Tests
 - ./run-tests

DevTools/HackStudio/Debugger/Debugger.h

@@ -1,4 +1,3 @@
-
 /*
  * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
  * All rights reserved.

Meta/check-license-headers.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+cd "$script_path/.." || exit 1
+
+# We simply check if the file starts with:
+# /*
+#  * Copyright
+PATTERN=$'^/\*\n \* Copyright'
+ERRORS=()
+
+while IFS= read -r f; do
+    if [[ ! $(cat "$f") =~ $PATTERN ]]; then
+        ERRORS+=("$f")
+    fi
+done < <(git ls-files -- \
+'*.cpp' \
+'*.h' \
+':!:Tests' \
+':!:Base' \
+':!:Kernel/FileSystem/ext2_fs.h' \
+':!:Libraries/LibC/getopt.cpp' \
+':!:Libraries/LibCore/puff.h' \
+':!:Libraries/LibELF/exec_elf.h' \
+)
+
+if (( ${#ERRORS[@]} )); then
+    echo "Files missing license headers: ${ERRORS[*]}"
+    exit 1
+fi