Split progress bar example into static and animated versions

examples/progress-animated/main.go

@@ -0,0 +1,93 @@
+package main
+
+// A simple example that shows how to render an animated progress bar. In this
+// example we bump the progress by 25% every two seconds, animating our
+// progress bar to its new target state.
+//
+// It's also possible to render a progress bar in a more static fashion without
+// transitions. For details on that approach see the progress-static example.
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/charmbracelet/bubbles/progress"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+const (
+	padding  = 2
+	maxWidth = 80
+)
+
+var helpStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#626262")).Render
+
+func main() {
+	m := model{
+		progress: progress.NewModel(progress.WithDefaultGradient()),
+	}
+
+	if err := tea.NewProgram(m).Start(); err != nil {
+		fmt.Println("Oh no!", err)
+		os.Exit(1)
+	}
+}
+
+type tickMsg time.Time
+
+type model struct {
+	progress progress.Model
+}
+
+func (_ model) Init() tea.Cmd {
+	return tickCmd()
+}
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.KeyMsg:
+		return m, tea.Quit
+
+	case tea.WindowSizeMsg:
+		m.progress.Width = msg.Width - padding*2 - 4
+		if m.progress.Width > maxWidth {
+			m.progress.Width = maxWidth
+		}
+		return m, nil
+
+	case tickMsg:
+		if m.progress.Percent() == 1.0 {
+			return m, tea.Quit
+		}
+
+		// Note that you can also use progress.Model.SetPercent to set the
+		// percentage value explicitly, too.
+		cmd := m.progress.IncrPercent(0.25)
+		return m, tea.Batch(tickCmd(), cmd)
+
+	// FrameMsg is sent when the progress bar wants to animate itself
+	case progress.FrameMsg:
+		var cmd tea.Cmd
+		m.progress, cmd = m.progress.Update(msg)
+		return m, cmd
+
+	default:
+		return m, nil
+	}
+}
+
+func (e model) View() string {
+	pad := strings.Repeat(" ", padding)
+	return "\n" +
+		pad + e.progress.View() + "\n\n" +
+		pad + helpStyle("Press any key to quit")
+}
+
+func tickCmd() tea.Cmd {
+	return tea.Tick(time.Second*2, func(t time.Time) tea.Msg {
+		return tickMsg(t)
+	})
+}