Plan document open actions in app core

src/app.cpp

@@ -193,7 +193,10 @@ void App::open_document(std::string path)
     if (!route)
         return;
 
-    if (route.value().kind == pp::app::DocumentOpenKind::import_abr)
+    const bool has_unsaved_project =
+        route.value().kind == pp::app::DocumentOpenKind::open_project && Canvas::I->m_unsaved;
+    const auto open_plan = pp::app::plan_document_open(route.value().kind, has_unsaved_project);
+    if (open_plan == pp::app::DocumentOpenPlanAction::prompt_import_abr)
     {
         auto mb = message_box("Import ABR", "Would you like to import the brushes?", true);
         mb->on_submit = [this, path] (Node* target) {
@@ -201,7 +204,7 @@ void App::open_document(std::string path)
             target->destroy();
         };
     }
-    else if (route.value().kind == pp::app::DocumentOpenKind::import_ppbr)
+    else if (open_plan == pp::app::DocumentOpenPlanAction::prompt_import_ppbr)
     {
         auto mb = message_box("Import PPBR", "Would you like to import the brushes?", true);
         mb->on_submit = [this, path] (Node* target) {
@@ -239,8 +242,7 @@ void App::open_document(std::string path)
             });
             ActionManager::clear();
         };
-        const auto open_decision = pp::app::plan_project_open(Canvas::I->m_unsaved);
-        if (open_decision == pp::app::ProjectOpenDecision::open_now)
+        if (open_plan == pp::app::DocumentOpenPlanAction::open_project_now)
         {
             open_action();
         }

src/app_core/document_session.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "app_core/document_route.h"
 #include "foundation/result.h"
 
 #include <cctype>
@@ -46,6 +47,13 @@ enum class DocumentFileWriteDecision {
     prompt_overwrite,
 };
 
+enum class DocumentOpenPlanAction {
+    open_project_now,
+    prompt_discard_unsaved_project,
+    prompt_import_abr,
+    prompt_import_ppbr,
+};
+
 struct DocumentFileTarget {
     std::string name;
     std::string directory;
@@ -64,6 +72,24 @@ struct DocumentVersionTarget {
         : ProjectOpenDecision::open_now;
 }
 
+[[nodiscard]] constexpr DocumentOpenPlanAction plan_document_open(
+    DocumentOpenKind kind,
+    bool has_unsaved_changes) noexcept
+{
+    switch (kind) {
+    case DocumentOpenKind::import_abr:
+        return DocumentOpenPlanAction::prompt_import_abr;
+    case DocumentOpenKind::import_ppbr:
+        return DocumentOpenPlanAction::prompt_import_ppbr;
+    case DocumentOpenKind::open_project:
+        return has_unsaved_changes
+            ? DocumentOpenPlanAction::prompt_discard_unsaved_project
+            : DocumentOpenPlanAction::open_project_now;
+    }
+
+    return DocumentOpenPlanAction::open_project_now;
+}
+
 [[nodiscard]] constexpr CloseRequestDecision plan_close_request(
     bool has_unsaved_changes,
     bool close_prompt_already_open) noexcept