From 8d93cc59ad64999cb30317eecbabbc608e07da4b Mon Sep 17 00:00:00 2001
From: Hernawan Fa'iz Abdillah <hernawan.faiz.abdillah@gmail.com>
Date: Thu, 20 Jul 2023 14:03:31 +0700
Subject: [PATCH] handle menu navigation inapplicable on single item

---
 src/engine.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/engine.rs b/src/engine.rs
index 16465204..b40017ff 100644
--- a/src/engine.rs
+++ b/src/engine.rs
@@ -891,6 +891,9 @@ impl Reedline {
             ReedlineEvent::MenuNext => {
                 self.active_menu()
                     .map_or(Ok(EventStatus::Inapplicable), |menu| {
+                        if menu.get_values().len() < 2 {
+                            return Ok(EventStatus::Inapplicable);
+                        }
                         menu.menu_event(MenuEvent::NextElement);
                         Ok(EventStatus::Handled)
                     })
@@ -898,6 +901,9 @@ impl Reedline {
             ReedlineEvent::MenuPrevious => {
                 self.active_menu()
                     .map_or(Ok(EventStatus::Inapplicable), |menu| {
+                        if menu.get_values().len() < 2 {
+                            return Ok(EventStatus::Inapplicable);
+                        }
                         menu.menu_event(MenuEvent::PreviousElement);
                         Ok(EventStatus::Handled)
                     })
@@ -905,6 +911,9 @@ impl Reedline {
             ReedlineEvent::MenuUp => {
                 self.active_menu()
                     .map_or(Ok(EventStatus::Inapplicable), |menu| {
+                        if menu.get_values().len() < 2 {
+                            return Ok(EventStatus::Inapplicable);
+                        }
                         menu.menu_event(MenuEvent::MoveUp);
                         Ok(EventStatus::Handled)
                     })
@@ -912,6 +921,9 @@ impl Reedline {
             ReedlineEvent::MenuDown => {
                 self.active_menu()
                     .map_or(Ok(EventStatus::Inapplicable), |menu| {
+                        if menu.get_values().len() < 2 {
+                            return Ok(EventStatus::Inapplicable);
+                        }
                         menu.menu_event(MenuEvent::MoveDown);
                         Ok(EventStatus::Handled)
                     })
@@ -919,6 +931,9 @@ impl Reedline {
             ReedlineEvent::MenuLeft => {
                 self.active_menu()
                     .map_or(Ok(EventStatus::Inapplicable), |menu| {
+                        if menu.get_values().len() < 2 {
+                            return Ok(EventStatus::Inapplicable);
+                        }
                         menu.menu_event(MenuEvent::MoveLeft);
                         Ok(EventStatus::Handled)
                     })
@@ -926,6 +941,9 @@ impl Reedline {
             ReedlineEvent::MenuRight => {
                 self.active_menu()
                     .map_or(Ok(EventStatus::Inapplicable), |menu| {
+                        if menu.get_values().len() < 2 {
+                            return Ok(EventStatus::Inapplicable);
+                        }
                         menu.menu_event(MenuEvent::MoveRight);
                         Ok(EventStatus::Handled)
                     })