Support add/delete pattern & curve

api/s12_curves.py

@@ -43,11 +43,29 @@ def set_curve_cache(name: str, cs: ChangeSet) -> SqlChangeSet:
         f_x, f_y = xy['x'], xy['y']
         undo_sql += f"\ninsert into curves (id, x, y) values ({f_id}, {f_x}, {f_y});"
 
-    redo_cs = g_update_prefix | { 'type': 'curve' } | new
-    undo_cs = g_update_prefix | { 'type': 'curve' } | old
+    redo_cs = { 'type': 'curve' } | new
+    undo_cs = { 'type': 'curve' } | old
 
     return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)
 
 
 def set_curve(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, set_curve_cache(name, cs))
+    result = set_curve_cache(name, cs)
+    result.redo_cs |= g_update_prefix
+    result.undo_cs |= g_update_prefix
+    return execute_command(name, result)
+
+
+def add_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    result = set_curve_cache(name, cs)
+    result.redo_cs |= g_add_prefix
+    result.undo_cs |= g_delete_prefix
+    return execute_command(name, result)
+
+
+def delete_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    cs.operations[0]['coords'] = []
+    result = set_curve_cache(name, cs)
+    result.redo_cs |= g_delete_prefix
+    result.undo_cs |= g_add_prefix
+    return execute_command(name, result)