feat: add support acp in common chat (#369)

sources/acp/AgentBinding.cpp

@@ -0,0 +1,88 @@
+// Copyright (C) 2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE
+
+#include "AgentBinding.hpp"
+
+#include <QCoreApplication>
+
+namespace QodeAssist::Acp {
+
+namespace {
+
+bool isUsableId(const QString &id)
+{
+    if (id.size() > maxAgentBindingIdLength)
+        return false;
+
+    for (const QChar c : id) {
+        if (c.category() == QChar::Other_Control || c.category() == QChar::Other_Format)
+            return false;
+    }
+
+    return true;
+}
+
+} // namespace
+
+QString AgentBinding::displayId() const
+{
+    return agentId.size() <= maxAgentBindingIdLength
+               ? agentId
+               : agentId.first(maxAgentBindingIdLength - 1) + QChar(0x2026);
+}
+
+QJsonObject AgentBinding::toJson() const
+{
+    QJsonObject json;
+    json["agentId"] = agentId;
+    if (!sessionId.isEmpty())
+        json["sessionId"] = sessionId;
+    return json;
+}
+
+AgentBinding AgentBinding::fromJson(const QJsonValue &value, QString *error)
+{
+    const auto fail = [error](const QString &reason) {
+        if (error)
+            *error = reason;
+        return AgentBinding{};
+    };
+
+    if (value.isUndefined() || value.isNull())
+        return {};
+
+    if (!value.isObject()) {
+        return fail(
+            QCoreApplication::translate("QodeAssist", "the agent binding is not an object"));
+    }
+
+    const QJsonObject json = value.toObject();
+
+    if (!json.value("agentId").isString() && json.contains("agentId")) {
+        return fail(
+            QCoreApplication::translate("QodeAssist", "the agent id is not a string"));
+    }
+
+    if (!json.value("sessionId").isString() && json.contains("sessionId")) {
+        return fail(
+            QCoreApplication::translate("QodeAssist", "the agent session id is not a string"));
+    }
+
+    AgentBinding binding{json["agentId"].toString(), json["sessionId"].toString()};
+
+    if (binding.agentId.isEmpty() && !binding.sessionId.isEmpty()) {
+        return fail(
+            QCoreApplication::translate(
+                "QodeAssist", "the agent binding names a session but no agent"));
+    }
+
+    if (!isUsableId(binding.agentId) || !isUsableId(binding.sessionId)) {
+        return fail(
+            QCoreApplication::translate("QodeAssist", "the agent binding holds an unusable id"));
+    }
+
+    return binding;
+}
+
+} // namespace QodeAssist::Acp