1 files changed, 5 insertions, 0 deletions
diff --git a/vis.h b/vis.h
index 913a503..6c6e0fe 100644
--- a/vis.h
+++ b/vis.h
@@ -224,6 +224,7 @@ enum VisOperator {
 	VIS_OP_PUT_AFTER_END,
 	VIS_OP_PUT_BEFORE,
 	VIS_OP_PUT_BEFORE_END,
+	VIS_OP_LAST, /* has to be last enum member */
 };
 
 /* set operator to execute, has immediate effect if
@@ -242,6 +243,10 @@ enum VisOperator {
  */
 bool vis_operator(Vis*, enum VisOperator, ...);
 
+typedef struct OperatorContext OperatorContext;
+typedef size_t (VisOperatorFunction)(Vis*, Text*, OperatorContext*);
+int vis_operator_register(Vis*, VisOperatorFunction*, void *context);
+
 enum VisMotion {
 	VIS_MOVE_LINE_DOWN,
 	VIS_MOVE_LINE_UP,