Make document session history effects explicit

src/app_core/document_session.cpp

@@ -1 +1,62 @@
 #include "app_core/document_session.h"
+
+namespace pp::app {
+namespace {
+
+[[nodiscard]] constexpr HistoryUiPlan make_history_clear_effect() noexcept
+{
+    HistoryUiPlan plan;
+    plan.operation = HistoryUiOperation::clear;
+    plan.clears_history = true;
+    plan.updates_memory_label = true;
+    return plan;
+}
+
+[[nodiscard]] constexpr HistoryUiPlan make_history_no_op_effect() noexcept
+{
+    HistoryUiPlan plan;
+    plan.operation = HistoryUiOperation::clear;
+    plan.no_op = true;
+    return plan;
+}
+
+} // namespace
+
+HistoryUiPlan plan_document_open_history(const DocumentOpenRoute& route) noexcept
+{
+    return route.kind == DocumentOpenKind::open_project
+        ? make_history_clear_effect()
+        : make_history_no_op_effect();
+}
+
+HistoryUiPlan plan_close_request_history(CloseRequestDecision) noexcept
+{
+    return make_history_no_op_effect();
+}
+
+HistoryUiPlan plan_document_save_history(DocumentSaveDecision) noexcept
+{
+    return make_history_no_op_effect();
+}
+
+HistoryUiPlan plan_document_workflow_history(DocumentWorkflowDecision) noexcept
+{
+    return make_history_no_op_effect();
+}
+
+HistoryUiPlan plan_document_file_save_history(const DocumentFileSavePlan&) noexcept
+{
+    return make_history_no_op_effect();
+}
+
+HistoryUiPlan plan_document_version_save_history(const DocumentVersionTarget&) noexcept
+{
+    return make_history_no_op_effect();
+}
+
+HistoryUiPlan plan_new_document_history(const NewDocumentPlan&) noexcept
+{
+    return make_history_clear_effect();
+}
+
+} // namespace pp::app