feat: Add settings page for providers (#353)

sources/providersConfig/ProviderLauncher.hpp

@@ -0,0 +1,82 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <functional>
+
+#include <QByteArray>
+#include <QHash>
+#include <QObject>
+#include <QPointer>
+#include <QString>
+#include <QStringList>
+
+#include "ProviderInstance.hpp"
+
+class QNetworkAccessManager;
+class QNetworkReply;
+class QProcessEnvironment;
+class QTimer;
+
+namespace Utils { class Process; }
+
+namespace QodeAssist::Providers {
+
+class ProviderLauncher : public QObject
+{
+    Q_OBJECT
+    Q_DISABLE_COPY_MOVE(ProviderLauncher)
+public:
+    enum State : quint8 {
+        Idle,      // no process running
+        Starting,  // QProcess::start invoked, waiting for it to be alive
+        Probing,   // process alive, polling ready_url
+        Ready,     // ready probe succeeded (or no probe configured)
+        Stopping,  // termination requested; waiting for QProcess to exit
+        Failed,    // process exited unexpectedly or readiness probe gave up
+    };
+    Q_ENUM(State)
+
+    explicit ProviderLauncher(QObject *parent = nullptr);
+    ~ProviderLauncher() override;
+
+
+    void start(const QString &instanceName, const LaunchConfig &cfg);
+    void stop(const QString &instanceName);
+    void restart(const QString &instanceName, const LaunchConfig &cfg);
+
+    [[nodiscard]] State state(const QString &instanceName) const;
+    [[nodiscard]] bool isReady(const QString &instanceName) const;
+    [[nodiscard]] QString lastError(const QString &instanceName) const;
+    [[nodiscard]] QByteArray scrollback(const QString &instanceName) const;
+
+    [[nodiscard]] QStringList activeInstances() const;
+
+signals:
+    void stateChanged(const QString &instanceName, State newState);
+    void bytesReceived(const QString &instanceName, const QByteArray &chunk);
+
+private:
+    struct Slot;
+    void teardownSlot(Slot *slot);
+    void launchProcess(Slot *slot);
+    void launchDetached(Slot *slot);
+    void appendScrollback(Slot *slot, const QByteArray &chunk);
+    void scheduleReadyProbe(Slot *slot);
+    void runReadyProbe(Slot *slot);
+    void probeOnceAsync(Slot *slot, int expectedGeneration, const QString &url,
+                        std::function<void(bool)> onResult);
+    void appendLog(Slot *slot, const QString &line);
+    void changeState(Slot *slot, State newState);
+    QString expandVars(const QString &input, const Slot *slot) const;
+    QStringList expandVars(const QStringList &args, const Slot *slot) const;
+    static QString expandOne(const QString &input, const Slot *slot,
+                             const QProcessEnvironment &sys);
+    static void killByPid(qint64 pid);
+
+    QHash<QString, Slot *> m_slots;
+    QNetworkAccessManager *m_nam = nullptr;
+};
+
+} // namespace QodeAssist::Providers