Add basic navigation to sidebar

components/sidebar.go

@@ -6,24 +6,48 @@ import (
 )
 
 type Sidebar struct {
-	data string
+	data   []string
+	sindex int
 }
 
-func (s Sidebar) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+func (s Sidebar) Init() tea.Cmd {
+	return nil
+}
+
+func (s *Sidebar) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	switch m := msg.(type) {
 	case tea.KeyMsg:
 		switch m.String() {
 		case "up":
-
+			if s.sindex > 0 {
+				s.sindex--
+			}
+		case "down":
+			if s.sindex < len(s.data)-1 {
+				s.sindex++
 			}
 		}
 	}
+	return s, nil
+}
 
 func (s Sidebar) View() string {
-	sidebar := lipgloss.
+	var items []string
+	for i, item := range s.data {
+		if i == s.sindex {
+			items = append(items, lipgloss.
+				NewStyle().
+				Background(lipgloss.Color("93BD57")).
+				Padding(1, 2).
+				Render(item))
+		} else {
+			items = append(items, item)
+		}
+	}
+
+	return lipgloss.
 		NewStyle().
 		BorderStyle(lipgloss.NormalBorder()).
 		Padding(1, 2).
-		Render(s.data)
-	return sidebar
+		Render(lipgloss.JoinVertical(lipgloss.Left, items...))
 }