Add some skeleton functions to make the option-using code in gnucash/…

…gnome-utils and gnucash/gnome happy.

libgnucash/app-utils/gnc-optiondb.cpp

@@ -1142,3 +1142,21 @@ void
 gnc_option_db_book_options(GncOptionDB*)
 {
 }
+
+const QofInstance*
+gnc_option_db_lookup_qofinstance_value(GncOptionDB*, const char*, const char*)
+{
+    return nullptr;
+}
+
+GList*
+gnc_option_db_lookup_glist_value(GncOptionDB*, const char*, const char*)
+{
+    return nullptr;
+}
+
+void
+gnc_option_db_set_glist_value(GncOptionDB*, const char*, const char*, GList*)
+{
+}
+

libgnucash/app-utils/gnc-optiondb.h

@@ -104,7 +104,70 @@ void gnc_option_db_save(GncOptionDB* odb, QofBook* book,
  */
 void gnc_option_db_book_options(GncOptionDB*);
 
+/**
+ * Retrieve the string value of an option in the GncOptionDB
+ *
+ * @param odb the GncOptionDB
+ * @param section the section in which the option is stored
+ * @param name the option name
+ * @return the static char* of the value or nullptr if the option isn't found
+ * or if its value isn't a string.
+ */
+const char* gnc_option_db_lookup_string_value(GncOptionDB*, const char*,
+                                              const char*);
 
+/**
+ * Set the string value of an option in the GncOptionDB.
+ *
+ * The value will not be saved if the option is not in the GncOptionDB or if the
+ * type of the option isn't string or text.
+ *
+ * @param odb the GncOptionDB
+ * @param section the section in which the option is stored
+ * @param name the option name
+ * @param value the value to be stored in the option.
+ */
+void gnc_option_db_set_string_value(GncOptionDB*, const char*,
+                                    const char*, const char*);
+
+/**
+ * Retrieve the string value of an option in the GncOptionDB
+ *
+ * @param odb the GncOptionDB
+ * @param section the section in which the option is stored
+ * @param name the option name
+ * @return the const QofInstance* of the value or nullptr if the option isn't
+ * found or if its value isn't a QofInstance*.
+ */
+
+const QofInstance* gnc_option_db_lookup_qofinstance_value(GncOptionDB*,
+                                                          const char*,
+                                                          const char*);
+
+/**
+ * Retrieve the GList* value of an option in the GncOptionDB
+ *
+ * @param odb the GncOptionDB
+ * @param section the section in which the option is stored
+ * @param name the option name
+ * @return the GList* of the value or nullptr if the option isn't found
+ * or if its value isn't a string.
+ */
+GList* gnc_option_db_lookup_glist_value(GncOptionDB*, const char*, const char*);
+
+/**
+ * Set the GList* value of an option in the GncOptionDB.
+ *
+ * The value will not be saved if the option is not in the GncOptionDB or if the
+ * type of the option isn't string or text.
+ *
+ * @param odb the GncOptionDB
+ * @param section the section in which the option is stored
+ * @param name the option name
+ * @param value the value to be stored in the option.
+ */
+void gnc_option_db_set_glist_value(GncOptionDB*, const char*,
+                                    const char*, GList*);
 
 #ifdef __cplusplus
 }