feat(plz): make the defualt selected item configrable

src/config/plz_menu.rs

@@ -19,7 +19,23 @@ const CHEATSHEETS_URL_TEMPLATE: &str =
 
 /// Plz menu config.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
-pub struct PlzMenu(pub Vec<PlzMenuItem>);
+pub struct PlzMenu {
+    /// The default selected poison in the menu.
+    pub selected_pos: PlzMenuSelection,
+    /// The menu items.
+    pub items: Vec<PlzMenuItem>,
+}
+
+/// Plz menu selection position.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum PlzMenuSelection {
+    /// The first item in the menu.
+    Start,
+    /// The middle item in the menu (in case of even number of items, the first item in the second half).
+    Center,
+    /// The last item in the menu.
+    End,
+}
 
 /// Plz menu item.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
@@ -45,7 +61,9 @@ pub enum PlzMenuOperation {
 
 impl Default for PlzMenu {
     fn default() -> Self {
-        PlzMenu(vec![
+        PlzMenu{
+            selected_pos: PlzMenuSelection::Center,
+            items: vec![
             PlzMenuItem {
                 display_msg: "Show man page".to_string(),
                 operation: PlzMenuOperation::Command,
@@ -71,6 +89,6 @@ impl Default for PlzMenu {
                 operation: PlzMenuOperation::Local,
                 args: vec!["~/info".to_string()],
             },
-        ])
+        ]}
     }
 }