Meta: Add a script check the presence of "#pragma once" in header files

.. and make travis run it.

I renamed check-license-headers.sh to check-style.sh and expanded it so
that it now also checks for the presence of "#pragma once" in .h files.

It also checks the presence of a (single) blank line above and below the
"#pragma once" line.

I also added "#pragma once" to all the files that need it: even the ones
we are not check.
I also added/removed blank lines in order to make the script not fail.

I also ran clang-format on the files I modified.

Libraries/LibC/bits/FILE.h

@@ -24,7 +24,6 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-
 #pragma once
 
 #include <sys/cdefs.h>

Libraries/LibC/float.h

@@ -24,3 +24,4 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once

Libraries/LibC/memory.h

@@ -24,4 +24,6 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <string.h>

Libraries/LibC/net/route.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <sys/socket.h>
 
 struct rtentry {

Libraries/LibC/netinet/tcp.h

@@ -23,3 +23,5 @@
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+
+#pragma once

Libraries/LibC/sys/arch/i386/regs.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <AK/Types.h>
 
 struct [[gnu::packed]] PtraceRegisters

Libraries/LibC/sys/file.h

@@ -24,3 +24,4 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once

Libraries/LibC/sys/mman.h

@@ -24,4 +24,6 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <mman.h>

Libraries/LibC/sys/sysmacros.h

@@ -24,3 +24,4 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once

Libraries/LibCore/Forward.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 namespace Core {
 
 class ArgsParser;

Libraries/LibCore/Gzip.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <AK/ByteBuffer.h>
 #include <AK/Optional.h>
 #include <AK/String.h>

Libraries/LibCore/puff.h

@@ -1,3 +1,5 @@
+#pragma once
+
 /* puff.h
   Copyright (C) 2002-2013 Mark Adler, all rights reserved
   version 2.3, 21 Jan 2013

Libraries/LibCrypto/BigInt/UnsignedBigInteger.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <AK/ByteBuffer.h>
 #include <AK/LogStream.h>
 #include <AK/String.h>
@@ -45,7 +46,7 @@ public:
     {
     }
 
-    UnsignedBigInteger() {}
+    UnsignedBigInteger() { }
 
     static UnsignedBigInteger create_invalid();
 

Libraries/LibDebug/Dwarf/AbbreviationsMap.h

@@ -25,12 +25,14 @@
  */
 
 #pragma once
+
 #include "DwarfTypes.h"
 #include <AK/HashMap.h>
 #include <AK/Optional.h>
 #include <AK/Types.h>
 
 namespace Dwarf {
+
 class DwarfInfo;
 
 class AbbreviationsMap {

Libraries/LibDebug/Dwarf/CompilationUnit.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include "AbbreviationsMap.h"
 #include <AK/Types.h>
 

Libraries/LibDebug/Dwarf/DIE.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include "CompilationUnit.h"
 #include "DwarfTypes.h"
 #include <AK/BufferStream.h>

Libraries/LibDebug/Dwarf/DwarfInfo.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include "CompilationUnit.h"
 #include "DwarfTypes.h"
 #include <AK/BufferStream.h>

Libraries/LibDebug/Dwarf/DwarfTypes.h

@@ -23,7 +23,9 @@
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+
 #pragma once
+
 #include <AK/Types.h>
 
 namespace Dwarf {

Libraries/LibDebug/Dwarf/Expression.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include "AK/ByteBuffer.h"
 #include "AK/Types.h"
 
@@ -32,6 +33,7 @@ class PtraceRegisters;
 
 namespace Dwarf {
 namespace Expression {
+
 enum class Type {
     None,
     UnsignedIntetger,
@@ -52,5 +54,5 @@ enum class Operations : u8 {
 
 Value evaluate(const ByteBuffer&, const PtraceRegisters&);
 
-};
-};
+}
+}

Libraries/LibDebug/Dwarf/LineProgram.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <AK/BufferStream.h>
 #include <AK/Vector.h>
 

Libraries/LibGUI/FilePicker.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <AK/LexicalPath.h>
 #include <AK/Optional.h>
 #include <LibCore/StandardPaths.h>

Libraries/LibGUI/Forward.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 namespace GUI {
 
 class AbstractButton;

Libraries/LibGUI/ResizeCorner.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <LibGUI/Widget.h>
 
 namespace GUI {

Libraries/LibGemini/Forward.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 namespace Gemini {
 
 class Document;

Libraries/LibGfx/Triangle.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <AK/Forward.h>
 #include <LibGfx/Point.h>
 

Libraries/LibHTTP/Forward.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 namespace HTTP {
 
 class HttpRequest;

Libraries/LibJS/MarkupGenerator.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <AK/HashTable.h>
 #include <AK/String.h>
 #include <LibJS/Forward.h>
@@ -61,4 +63,4 @@ private:
     static String wrap_string_in_style(String source, StyleType type);
 };
 
-}
+}

Libraries/LibJS/Runtime/Date.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <LibCore/DateTime.h>
 #include <LibJS/Runtime/Object.h>
 

Libraries/LibJS/Runtime/Exception.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <LibJS/Runtime/Cell.h>
 #include <LibJS/Runtime/Value.h>
 

Libraries/LibLine/Span.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <stdlib.h>
 
 namespace Line {

Libraries/LibLine/Style.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <AK/String.h>
 #include <AK/Types.h>
 #include <AK/Vector.h>

Libraries/LibLine/SuggestionDisplay.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <AK/Forward.h>
 #include <AK/String.h>
 #include <LibLine/SuggestionManager.h>

Libraries/LibLine/SuggestionManager.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <AK/Forward.h>
 #include <AK/String.h>
 #include <AK/Utf32View.h>

Libraries/LibWeb/Layout/LayoutReplaced.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <LibWeb/DOM/Element.h>
 #include <LibWeb/Layout/LayoutBox.h>
 

Libraries/LibWeb/PageView.h

@@ -23,6 +23,7 @@
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+
 #pragma once
 
 #include <AK/URL.h>