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.

.travis.yml

@@ -33,7 +33,7 @@ before_install:
 script:
 - export SERENITY_ROOT=$(pwd)
 - Meta/lint-shell-scripts.sh
-- Meta/check-license-headers.sh
+- Meta/check-style.sh
 - cd Toolchain
 - TRY_USE_LOCAL_TOOLCHAIN=y ./BuildIt.sh
 - cd "$SERENITY_ROOT"

AK/Base64.h

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

Applications/Browser/BrowserConsoleClient.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 <LibGUI/Widget.h>

Applications/Browser/ConsoleWidget.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 "BrowserConsoleClient.h"

Applications/Browser/InspectorWidget.h

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

Applications/FileManager/FileUtils.h

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

Applications/FontEditor/GlyphEditorWidget.h

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

Applications/SystemMonitor/GraphWidget.h

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

Demos/Eyes/EyesWidget.h

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

DevTools/HackStudio/Debugger/BacktraceModel.h

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

DevTools/HackStudio/Debugger/BreakpointCallback.h

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

DevTools/HackStudio/Debugger/VariablesModel.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include "Debugger.h"
 #include <AK/NonnullOwnPtr.h>
 #include <LibGUI/Model.h>

DevTools/ProfileViewer/ProfileTimelineWidget.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include <LibGUI/Frame.h>
 
 class Profile;

Games/Solitaire/SolitaireWidget.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include "CardStack.h"
 #include <LibGUI/Painter.h>
 #include <LibGUI/Widget.h>

Kernel/Devices/PATAChannel.h

@@ -34,17 +34,18 @@
 // More information about the ATA spec for PATA can be found here:
 //      ftp://ftp.seagate.com/acrobat/reference/111-1c.pdf
 //
+
 #pragma once
 
 #include <AK/OwnPtr.h>
 #include <AK/RefPtr.h>
+#include <Kernel/IO.h>
 #include <Kernel/Lock.h>
 #include <Kernel/PCI/Access.h>
 #include <Kernel/PCI/Device.h>
+#include <Kernel/PhysicalAddress.h>
 #include <Kernel/VM/PhysicalPage.h>
 #include <Kernel/WaitQueue.h>
-#include <Kernel/IO.h>
-#include <Kernel/PhysicalAddress.h>
 
 namespace Kernel {
 

Kernel/Devices/PATADiskDevice.h

@@ -27,7 +27,7 @@
 //
 // A Disk Device Connected to a PATA Channel
 //
-//
+
 #pragma once
 
 #include <Kernel/Devices/BlockDevice.h>

Kernel/Devices/SerialDevice.h

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

Kernel/FileSystem/ext2_types.h

@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 /* 
  * If linux/types.h is already been included, assume it has defined
  * everything we need.  (cross fingers)  Other header files may have 

Kernel/PCI/IOAccess.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <Kernel/PCI/Access.h>
 
 namespace Kernel {

Kernel/PCI/MMIOAccess.h

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

Kernel/Ptrace.h

@@ -25,6 +25,7 @@
  */
 
 #pragma once
+
 #include <Kernel/KResult.h>
 #include <Kernel/Process.h>
 #include <Kernel/Syscall.h>

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>

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>

Meta/check-license-headers.sh

@@ -1,30 +0,0 @@
-#!/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

Meta/check-style.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
+cd "$script_path/.." || exit 1
+
+# We simply check if the file starts with:
+# /*
+#  * Copyright
+LICENSE_HEADER_PATTERN=$'^/\*\n \* Copyright'
+MISSING_LICENSE_HEADER_ERRORS=()
+
+# We check that "#pragma once" is present
+PRAGMA_ONCE_PATTERN='#pragma once'
+MISSING_PRAGMA_ONCE_ERRORS=()
+
+# We make sure that there's a blank line before and after pragma once
+GOOD_PRAGMA_ONCE_PATTERN=$'(^|\\S\n\n)#pragma once(\n\n\\S.|$)'
+BAD_PRAGMA_ONCE_ERRORS=()
+
+while IFS= read -r f; do
+    file_content="$(< "$f")"
+    if [[ ! "$file_content" =~ $LICENSE_HEADER_PATTERN ]]; then
+        MISSING_LICENSE_HEADER_ERRORS+=("$f")
+    fi
+    if [[ "$f" =~ \.h$ ]]; then
+        if [[ ! "$file_content" =~ $PRAGMA_ONCE_PATTERN ]]; then
+            MISSING_PRAGMA_ONCE_ERRORS+=("$f")
+        elif [[ ! "$file_content" =~ $GOOD_PRAGMA_ONCE_PATTERN ]]; then
+            BAD_PRAGMA_ONCE_ERRORS+=("$f")
+        fi
+    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' \
+)
+
+exit_status=0
+if (( ${#MISSING_LICENSE_HEADER_ERRORS[@]} )); then
+    echo "Files missing license headers: ${MISSING_LICENSE_HEADER_ERRORS[*]}"
+    exit_status=1
+fi
+if (( ${#MISSING_PRAGMA_ONCE_ERRORS[@]} )); then
+    echo "Header files missing \"#pragma once\": ${MISSING_PRAGMA_ONCE_ERRORS[*]}"
+    exit_status=1
+fi
+if (( ${#BAD_PRAGMA_ONCE_ERRORS[@]} )); then
+    echo "\"#pragma once\" should have a blank line before and after in these files: ${BAD_PRAGMA_ONCE_ERRORS[*]}"
+    exit_status=1
+fi
+exit "$exit_status"

Services/LookupServer/DNSResponse.h

@@ -24,14 +24,13 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-
 #pragma once
 
 #include "DNSAnswer.h"
 #include "DNSQuestion.h"
+#include <AK/Optional.h>
 #include <AK/Types.h>
 #include <AK/Vector.h>
-#include <AK/Optional.h>
 
 class DNSResponse {
 public:
@@ -69,7 +68,7 @@ public:
     Code code() const { return (Code)m_code; }
 
 private:
-    DNSResponse() {}
+    DNSResponse() { }
 
     u16 m_id { 0 };
     u8 m_code { 0 };

Services/SystemMenu/ShutdownDialog.h

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

Services/Taskbar/TaskbarWindow.h

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