Split progress bar example into static and animated versions

examples/progress-static/main.go

@@ -0,0 +1,94 @@
+package main
+
+// A simple example that shows how to render a progress bar in a "pure"
+// fashion. In this example we bump the progress by 25% every second,
+// maintaining the progress state on our top level model using the progress bar
+// model's ViewAs method only for rendering.
+//
+// The signature for ViewAs is:
+//
+//     func (m Model) ViewAs(percent float64) string
+//
+// So it takes a float between 0 and 1, and renders the progress bar
+// accordingly. When using the progress bar in this "pure" fashion and there's
+// no need to call an Update method.
+//
+// The progress bar is also able to animate itself, however. For details see
+// the progress-animated 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() {
+	prog := progress.NewModel(progress.WithScaledGradient("#FF7CCB", "#FDFF8C"))
+
+	if err := tea.NewProgram(model{progress: prog}).Start(); err != nil {
+		fmt.Println("Oh no!", err)
+		os.Exit(1)
+	}
+}
+
+type tickMsg time.Time
+
+type model struct {
+	percent  float64
+	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:
+		m.percent += 0.25
+		if m.percent > 1.0 {
+			m.percent = 1.0
+			return m, tea.Quit
+		}
+		return m, tickCmd()
+
+	default:
+		return m, nil
+	}
+}
+
+func (e model) View() string {
+	pad := strings.Repeat(" ", padding)
+	return "\n" +
+		pad + e.progress.ViewAs(e.percent) + "\n\n" +
+		pad + helpStyle("Press any key to quit")
+}
+
+func tickCmd() tea.Cmd {
+	return tea.Tick(time.Second, func(t time.Time) tea.Msg {
+		return tickMsg(t)
+	})
+}