feat(tui): add document model and host message interfaces

1 files changed, 63 insertions, 0 deletions

diff --git a/include/ricochet/tui/identity.hh b/include/ricochet/tui/identity.hh
new file mode 100644
index 0000000..624c6cc
--- /dev/null
+++ b/include/ricochet/tui/identity.hh
@@ -0,0 +1,63 @@
+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <compare>
+#include <cstdint>
+
+namespace ricochet::tui {
+
+template<class Tag>
+struct Identity
+{
+  std::uint64_t value { 0 };
+
+  auto operator<=>( const Identity& ) const = default;
+};
+
+using TabId = Identity<struct TabTag>;
+using DocumentId = Identity<struct DocumentTag>;
+using Revision = Identity<struct RevisionTag>;
+using DraftRevision = Identity<struct DraftRevisionTag>;
+using BlockId = Identity<struct BlockTag>;
+using LinkId = Identity<struct LinkTag>;
+using ControlId = Identity<struct ControlTag>;
+using FormId = Identity<struct FormTag>;
+using OptionId = Identity<struct OptionTag>;
+using RadioGroupId = Identity<struct RadioGroupTag>;
+using TaskId = Identity<struct TaskTag>;
+using RequestId = Identity<struct RequestTag>;
+
+struct DocumentVersion
+{
+  DocumentId document {};
+  Revision revision {};
+
+  bool operator==( const DocumentVersion& ) const = default;
+};
+
+struct DocumentScope
+{
+  TabId tab {};
+  DocumentVersion version {};
+
+  bool operator==( const DocumentScope& ) const = default;
+};
+
+} // namespace ricochet::tui