make values capable of being a list & add boost

Signed-off-by: Folling <mail@folling.io>

src/objects/properties/property.cpp

@@ -8,6 +8,7 @@
 #include <persistence/function_context.hpp>
 #include <persistence/project.hpp>
 #include <sys/stat.h>
+#include <values/value.hpp>
 
 IkarusProperty::IkarusProperty(IkarusProject * project, IkarusId id, Data data):
     IkarusObject{project, id},
@@ -121,6 +122,31 @@ IkarusPropertySource const * ikarus_property_get_source(IkarusProperty const * p
     }
 }
 
+IkarusValue * ikarus_property_get_default_value(IkarusProperty const * property) {
+    LOG_VERBOSE("fetching property default value");
+
+    LOG_VERBOSE("project={};property={}", property->get_project()->get_path().c_str(), property->get_id());
+
+    auto * ctx = property->get_project()->get_function_context();
+
+    VTRY(
+        auto const value,
+        property->get_project()
+            ->get_db()
+            ->query_one<int>("SELECT `default_value` FROM `properties` WHERE `id` = ?", property->get_id())
+            .on_error([ctx](auto const& err) {
+                ctx->set_error(
+                    fmt::format("failed to fetch property's default value: {}", err),
+                    true,
+                    IkarusErrorInfo_Source_SubSystem,
+                    IkarusErrorInfo_Type_SubSystem_Database
+                );
+            })
+    );
+
+    return new IkarusValue(property->get_project(), value);
+}
+
 void ikarus_property_visit(
     IkarusProperty * property,
     void (*toggle_property_visitor)(struct IkarusToggleProperty *, void *),