Provide an accessor to GncOptionAccountValue::m_allowed

To enable its use by gnc_account_sel_filter

libgnucash/app-utils/CMakeLists.txt

@@ -92,6 +92,7 @@ set(app_utils_ALL_LIBRARIES
     gnc-engine
     gnc-locale-tax
     gnucash-guile
+    ${GLIB_LDFLAGS}
     ${GIO_LDFLAGS}
     ${LIBXML2_LDFLAGS}
     ${LIBXSLT_LDFLAGS}

libgnucash/app-utils/gnc-option-impl.cpp

@@ -48,6 +48,24 @@ GncOptionAccountValue::validate(const GncOptionAccountList& values) const
     return true;
 }
 
+/**
+ * Create a GList of account types to pass to gnc_account_sel_set_acct_filters.
+ * gnc_account_sel_set_acct_filters copies the list so the intermediary caller
+ * is responsible for freeing the list.
+ *
+ * @return an allocated GList* or nullptr if the list is empty.
+ */
+GList*
+GncOptionAccountValue::account_type_list() const noexcept
+{
+    if (m_allowed.empty())
+        return nullptr;
+    GList* retval;
+    for (auto type : m_allowed)
+        retval = g_list_prepend(retval, GINT_TO_POINTER(type));
+    return g_list_reverse(retval);
+}
+
 static constexpr int days_in_month[12]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
 
 static void

libgnucash/app-utils/gnc-option-impl.hpp

@@ -584,6 +584,7 @@ public:
             //throw!
             m_value = values;
     }
+    GList* account_type_list() const noexcept;
     bool is_changed() const noexcept { return m_value != m_default_value; }
     GncOptionUIType get_ui_type() const noexcept { return m_ui_type; }
     void make_internal() { m_ui_type = GncOptionUIType::INTERNAL; }

libgnucash/app-utils/gnc-option.cpp

@@ -256,6 +256,18 @@ GncOption::permissible_value_description(std::size_t index) const
                       }, *m_option);
 }
 
+GList*
+GncOption::account_type_list() const noexcept
+{
+    return std::visit([] (const auto& option) -> GList* {
+                          if constexpr (std::is_same_v<std::decay_t<decltype(option)>,
+                                        GncOptionAccountValue>)
+                              return option.account_type_list();
+                          else
+                              return nullptr;
+                      }, *m_option);
+}
+
 std::ostream&
 GncOption::out_stream(std::ostream& oss) const
 {

libgnucash/app-utils/gnc-option.hpp

@@ -24,6 +24,11 @@
 #ifndef GNC_OPTION_HPP_
 #define GNC_OPTION_HPP_
 
+extern "C"
+{
+#include <glib.h>
+}
+
 #include <string>
 #include <iostream>
 #include <variant>
@@ -86,6 +91,7 @@ public:
     const std::string& permissible_value(std::size_t index) const;
     const std::string& permissible_value_name(std::size_t index) const;
     const std::string& permissible_value_description(std::size_t index) const;
+    GList* account_type_list() const noexcept;
     std::ostream& out_stream(std::ostream& oss) const;
     std::istream& in_stream(std::istream& iss);
     std::ostream& to_scheme(std::ostream& oss) const;