Clangd: add quick fix factory

Change-Id: Idea71364b0e3f528e9dd366d46a2797f5056dfed
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangcodemodel/clangdquickfixfactory.cpp

@@ -0,0 +1,62 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "clangdquickfixfactory.h"
+
+#include "clangdclient.h"
+#include "clangmodelmanagersupport.h"
+
+#include <languageclient/languageclientquickfix.h>
+
+using namespace LanguageServerProtocol;
+
+namespace ClangCodeModel {
+namespace Internal {
+
+ClangdQuickFixFactory::ClangdQuickFixFactory() = default;
+
+void ClangdQuickFixFactory::match(const CppEditor::Internal::CppQuickFixInterface &interface,
+                                  QuickFixOperations &result)
+{
+    const auto client = ClangModelManagerSupport::instance()->clientForFile(interface.filePath());
+    if (!client)
+        return;
+
+    const auto uri = DocumentUri::fromFilePath(interface.filePath());
+    QTextCursor cursor(interface.textDocument());
+    cursor.setPosition(interface.position());
+    cursor.select(QTextCursor::LineUnderCursor);
+    const QList<Diagnostic> &diagnostics = client->diagnosticsAt(uri, cursor);
+    for (const Diagnostic &diagnostic : diagnostics) {
+        ClangdDiagnostic clangdDiagnostic(diagnostic);
+        if (const auto actions = clangdDiagnostic.codeActions()) {
+            for (const CodeAction &action : *actions)
+                result << new LanguageClient::CodeActionQuickFixOperation(action, client);
+        }
+    }
+}
+
+} // namespace Internal
+} // namespace ClangCodeModel