enter duplicates stack val if buf empty

1 files changed, 2 insertions, 0 deletions

diff --git a/ui.go b/ui.go
index 4d121a7..cea51e7 100644
--- a/ui.go
+++ b/ui.go
@@ -64,6 +64,8 @@ func (ui UI) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				fn(&ui.calc)
 			} else if v, err := ui.calc.parseBuffer(); err == nil {
 				ui.calc.stack.push(v)
+			} else if ui.calc.buf == "" {
+				ui.calc.dup()
 			}
 			ui.calc.buf = ""
 		default: