Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibCore/TimeZoneWatcherLinux.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Platform.h>
+#include <LibCore/FileWatcher.h>
+#include <LibCore/TimeZoneWatcher.h>
+
+#if !defined(AK_OS_LINUX)
+static_assert(false, "This file must only be used for Linux");
+#endif
+
+namespace Core {
+
+static constexpr auto time_zone_files = Array {
+    "/etc/localtime"sv,
+    "/etc/timezone"sv,
+    "/etc/TZ"sv,
+};
+
+static constexpr auto time_zone_mask = FileWatcherEvent::Type::ContentModified
+    | FileWatcherEvent::Type::Deleted
+    | FileWatcherEvent::Type::DoNotFollowLink;
+
+class TimeZoneWatcherImpl final : public TimeZoneWatcher {
+public:
+    static ErrorOr<NonnullOwnPtr<TimeZoneWatcherImpl>> create()
+    {
+        auto file_watcher = TRY(FileWatcher::create());
+
+        for (auto time_zone_file : time_zone_files) {
+            if (auto result = file_watcher->add_watch(time_zone_file, time_zone_mask); !result.is_error())
+                break;
+        }
+
+        return adopt_own(*new TimeZoneWatcherImpl(move(file_watcher)));
+    }
+
+private:
+    explicit TimeZoneWatcherImpl(NonnullRefPtr<FileWatcher> file_watcher)
+        : m_file_watcher(move(file_watcher))
+    {
+        m_file_watcher->on_change = [this](Core::FileWatcherEvent const& event) {
+            if (on_time_zone_changed)
+                on_time_zone_changed();
+
+            if (has_flag(event.type, FileWatcherEvent::Type::Deleted))
+                (void)m_file_watcher->add_watch(event.event_path, time_zone_mask);
+        };
+    }
+
+    NonnullRefPtr<FileWatcher> m_file_watcher;
+};
+
+ErrorOr<NonnullOwnPtr<TimeZoneWatcher>> TimeZoneWatcher::create()
+{
+    return TimeZoneWatcherImpl::create();
+}
+
+}