LibFileSystem: Move TempFile from LibCore to LibFileSystem

As suggested in commit de18485

Userland/Libraries/LibFileSystem/TempFile.cpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2020-2023, the SerenityOS developers.
+ * Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/System.h>
+#include <LibFileSystem/FileSystem.h>
+#include <LibFileSystem/TempFile.h>
+
+namespace FileSystem {
+
+TempFile::~TempFile()
+{
+    // Temporary files aren't removed by anyone else, so we must do it ourselves.
+    auto recursion_mode = RecursionMode::Disallowed;
+    if (m_type == Type::Directory)
+        recursion_mode = RecursionMode::Allowed;
+
+    auto result = FileSystem::remove(m_path, recursion_mode);
+    if (result.is_error())
+        warnln("Removal of temporary file failed '{}': {}", m_path, result.error().string_literal());
+}
+
+ErrorOr<NonnullOwnPtr<TempFile>> TempFile::create_temp_directory()
+{
+    char pattern[] = "/tmp/tmp.XXXXXX";
+
+    auto path = TRY(Core::System::mkdtemp(pattern));
+    return adopt_nonnull_own_or_enomem(new (nothrow) TempFile(Type::Directory, path));
+}
+
+ErrorOr<NonnullOwnPtr<TempFile>> TempFile::create_temp_file()
+{
+    char file_path[] = "/tmp/tmp.XXXXXX";
+    TRY(Core::System::mkstemp(file_path));
+
+    auto string = TRY(String::from_utf8({ file_path, sizeof file_path }));
+    return adopt_nonnull_own_or_enomem(new (nothrow) TempFile(Type::File, string));
+}
+
+}