feat(tickertape): implement ticker tape model and functionality

tickertape/tickertape.go

@@ -0,0 +1,66 @@
+package tickertape
+
+import (
+	"time"
+
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+// Model represents the state of the ticker tape.
+type Model struct {
+	Text        string // The Text to be displayed in the ticker tape.
+	Position    int    // The current Position of the ticker tape.
+	TickerWidth int    // The TickerWidth of the ticker tape display.
+}
+
+// tickMsg is a message used to trigger the ticker tape update.
+type tickMsg struct{}
+
+// Init initializes the ticker tape model and starts the ticking process.
+func (m *Model) Init() tea.Cmd {
+	return m.tick()
+}
+
+// tick returns a command that sends a tickMsg after a specified duration.
+func (m *Model) tick() tea.Cmd {
+	return tea.Tick(time.Millisecond*150, func(time.Time) tea.Msg {
+		return tickMsg{}
+	})
+}
+
+// Update handles incoming messages and updates the ticker tape model accordingly.
+func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		m.TickerWidth = msg.Width // Update the TickerWidth of the ticker tape display.
+		return m, nil
+	case tickMsg:
+		m.Position = (m.Position + 1) % len(m.Text) // Update the Position of the ticker tape.
+		return m, m.tick()                          // Schedule the next tick.
+	}
+	return m, nil
+}
+
+// View renders the ticker tape view.
+func (m *Model) View() string {
+	ticker := m.Text[m.Position:] + m.Text[:m.Position]
+
+	// Get the actual displayable TickerWidth
+	displayWidth := m.TickerWidth
+	if displayWidth < len(ticker) {
+		ticker = ticker[:displayWidth]
+	}
+
+	return ticker
+}
+
+// UpdateText updates the Text of the ticker tape.
+func (m *Model) UpdateText(newText string) {
+	m.Text = newText
+	m.Position = 0 // Reset Position to start.
+}
+
+// UpdateWidth updates the TickerWidth of the ticker tape.
+func (m *Model) UpdateWidth(newWidth int) {
+	m.TickerWidth = newWidth
+}