Msgs can now be sent to Programs with Program.Send(Msg)

examples/send-msg/main.go

@@ -0,0 +1,141 @@
+package main
+
+// A simple example that shows how to send messages to a Bubble Tea program
+// from outside the program using Program.Send(Msg).
+
+import (
+	"fmt"
+	"math/rand"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/charmbracelet/bubbles/spinner"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+var (
+	spinnerStyle  = lipgloss.NewStyle().Foreground(lipgloss.Color("63"))
+	helpStyle     = lipgloss.NewStyle().Foreground(lipgloss.Color("241")).Margin(1, 0)
+	dotStyle      = helpStyle.Copy().UnsetMargins()
+	foodStyle     = lipgloss.NewStyle().Foreground(lipgloss.Color("36"))
+	durationStyle = dotStyle.Copy()
+	appStyle      = lipgloss.NewStyle().Margin(1, 2, 0, 2)
+)
+
+type resultMsg struct {
+	duration time.Duration
+	food     string
+}
+
+func (r resultMsg) String() string {
+	if r.duration == 0 {
+		return dotStyle.Render(strings.Repeat(".", 30))
+	}
+	return fmt.Sprintf("🍔 Ate %s %s", r.food,
+		durationStyle.Render(r.duration.String()))
+}
+
+type model struct {
+	spinner  spinner.Model
+	results  []resultMsg
+	quitting bool
+}
+
+func newModel() model {
+	const numLastResults = 5
+	s := spinner.NewModel()
+	s.Style = spinnerStyle
+	return model{
+		spinner: s,
+		results: make([]resultMsg, numLastResults),
+	}
+}
+
+func (m model) Init() tea.Cmd {
+	return spinner.Tick
+}
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.KeyMsg:
+		m.quitting = true
+		return m, tea.Quit
+	case resultMsg:
+		m.results = append(m.results[1:], msg)
+		return m, nil
+	case spinner.TickMsg:
+		var cmd tea.Cmd
+		m.spinner, cmd = m.spinner.Update(msg)
+		return m, cmd
+	default:
+		return m, nil
+	}
+}
+
+func (m model) View() string {
+	var s string
+
+	if m.quitting {
+		s += "That’s all for today!"
+	} else {
+		s += m.spinner.View() + " Eating food..."
+	}
+
+	s += "\n\n"
+
+	for _, res := range m.results {
+		s += res.String() + "\n"
+	}
+
+	if !m.quitting {
+		s += helpStyle.Render("Press any key to exit")
+	}
+
+	if m.quitting {
+		s += "\n"
+	}
+
+	return appStyle.Render(s)
+}
+
+func main() {
+	rand.Seed(time.Now().UTC().UnixNano())
+
+	done := make(chan struct{})
+
+	p := tea.NewProgram(newModel())
+	go func() {
+		if err := p.Start(); err != nil {
+			fmt.Println("Error running program:", err)
+			os.Exit(1)
+		}
+		close(done)
+	}()
+
+	// Simulate activity
+	go func() {
+		for {
+			pause := time.Duration(rand.Int63n(899)+100) * time.Millisecond
+			time.Sleep(pause)
+
+			// Send the Bubble Tea program a message from outside the program.
+			p.Send(resultMsg{food: randomFood(), duration: pause})
+		}
+	}()
+
+	<-done
+}
+
+func randomEmoji() string {
+	emojis := []rune("🍦🧋🍡🤠👾😭🦊🐯🦆🥨🎏🍔🍒🍥🎮📦🦁🐶🐸🍕🥐🧲🚒🥇🏆🌽")
+	return string(emojis[rand.Intn(len(emojis))])
+}
+
+func randomFood() string {
+	food := []string{"an apple", "a pear", "a gherkin", "a party gherkin",
+		"a kohlrabi", "some spaghetti", "tacos", "a currywurst", "some curry",
+		"a sandwich", "some peanut butter", "some cashews", "some ramen"}
+	return string(food[rand.Intn(len(food))])
+}