From 5dab33694fbbe82f4aa46ad148584ec105385372 Mon Sep 17 00:00:00 2001
From: Christopher Lam <christopher.lck@gmail.com>
Date: Thu, 2 Dec 2021 22:12:12 +0800
Subject: [PATCH] [1/3][qofbook.cpp] add & expose qof_book_unset_feature

same as qof_book_set_feature but removes feature item
---
 libgnucash/engine/qofbook.cpp | 21 +++++++++++++++++++++
 libgnucash/engine/qofbook.h   |  1 +
 2 files changed, 22 insertions(+)

diff --git a/libgnucash/engine/qofbook.cpp b/libgnucash/engine/qofbook.cpp
index ab2b012319..1cbc673eb8 100644
--- a/libgnucash/engine/qofbook.cpp
+++ b/libgnucash/engine/qofbook.cpp
@@ -1255,6 +1255,27 @@ qof_book_set_feature (QofBook *book, const gchar *key, const gchar *descr)
     }
 }
 
+
+void
+qof_book_unset_feature (QofBook *book, const gchar *key, const gchar *descr)
+{
+    KvpFrame *frame = qof_instance_get_slots (QOF_INSTANCE (book));
+    KvpValue* feature = nullptr;
+    auto feature_slot = frame->get_slot({GNC_FEATURES});
+    if (feature_slot)
+    {
+        auto feature_frame = feature_slot->get<KvpFrame*>();
+        feature = feature_frame->get_slot({key});
+    }
+    if (feature == nullptr || g_strcmp0 (feature->get<const char*>(), descr))
+    {
+        qof_book_begin_edit (book);
+        delete frame->set_path({GNC_FEATURES, key}, nullptr);
+        qof_instance_set_dirty (QOF_INSTANCE (book));
+        qof_book_commit_edit (book);
+    }
+}
+
 void
 qof_book_load_options (QofBook *book, GNCOptionLoad load_cb, GNCOptionDB *odb)
 {
diff --git a/libgnucash/engine/qofbook.h b/libgnucash/engine/qofbook.h
index f48ed94002..a262299380 100644
--- a/libgnucash/engine/qofbook.h
+++ b/libgnucash/engine/qofbook.h
@@ -382,6 +382,7 @@ void qof_book_option_frame_delete (QofBook *book, const char* opt_name);
 /** Access functions for reading and setting the used-features on this book.
  */
 GHashTable *qof_book_get_features (QofBook *book);
+void qof_book_unset_feature (QofBook *book, const gchar *key, const gchar *descr);
 void qof_book_set_feature (QofBook *book, const gchar *key, const gchar *descr);
 
 void qof_book_begin_edit(QofBook *book);