Copilot: Add LSP plugin for Copilot

Fixes: QTCREATORBUG-27771
Change-Id: I1249b9a4492427208a70b3e21bf20ac668fc3c50
Reviewed-by: hjk <hjk@qt.io>

src/plugins/copilot/copilotclient.h

@@ -0,0 +1,53 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "requests/checkstatus.h"
+#include "requests/getcompletions.h"
+#include "requests/signinconfirm.h"
+#include "requests/signininitiate.h"
+#include "requests/signout.h"
+
+#include <languageclient/client.h>
+
+#include <utils/filepath.h>
+
+#include <QHash>
+#include <QTemporaryDir>
+
+namespace Copilot::Internal {
+
+class DocumentWatcher;
+
+class CopilotClient : public LanguageClient::Client
+{
+public:
+    explicit CopilotClient();
+
+    static CopilotClient *instance();
+
+    void requestCompletion(
+        const Utils::FilePath &path,
+        int version,
+        LanguageServerProtocol::Position position,
+        std::function<void(const GetCompletionRequest::Response &response)> callback);
+
+    void requestCheckStatus(
+        bool localChecksOnly,
+        std::function<void(const CheckStatusRequest::Response &response)> callback);
+
+    void requestSignOut(std::function<void(const SignOutRequest::Response &response)> callback);
+
+    void requestSignInInitiate(
+        std::function<void(const SignInInitiateRequest::Response &response)> callback);
+
+    void requestSignInConfirm(
+        const QString &userCode,
+        std::function<void(const SignInConfirmRequest::Response &response)> callback);
+
+private:
+    std::map<Utils::FilePath, std::unique_ptr<DocumentWatcher>> m_documentWatchers;
+};
+
+} // namespace Copilot::Internal