Open a TTY if input is not a TTY, unless the user has spec'd otherwise

examples/pipe/main.go

@@ -0,0 +1,94 @@
+package main
+
+// An example of how to pipe in data to a Bubble Tea application. It's actually
+// more of a proof that Bubble Tea will automatically listen for keystrokes
+// when input is not a TTY, such as when data is piped or redirected in.
+//
+// In the case of this example we're listing for a single keystroke used to
+// exit the program.
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/charmbracelet/bubbles/textinput"
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+func main() {
+	stat, err := os.Stdin.Stat()
+	if err != nil {
+		panic(err)
+	}
+
+	if stat.Mode()&os.ModeNamedPipe == 0 && stat.Size() == 0 {
+		fmt.Println("Try piping in some text.")
+		os.Exit(1)
+	}
+
+	reader := bufio.NewReader(os.Stdin)
+	var b strings.Builder
+
+	for {
+		r, _, err := reader.ReadRune()
+		if err != nil && err == io.EOF {
+			break
+		}
+		_, err = b.WriteRune(r)
+		if err != nil {
+			fmt.Println("Error getting input:", err)
+			os.Exit(1)
+		}
+	}
+
+	model := newModel(strings.TrimSpace(b.String()))
+
+	if err := tea.NewProgram(model).Start(); err != nil {
+		fmt.Println("Couldn't start program:", err)
+		os.Exit(1)
+	}
+}
+
+type model struct {
+	userInput textinput.Model
+}
+
+func newModel(initialValue string) (m model) {
+	i := textinput.NewModel()
+	i.Prompt = ""
+	i.CursorColor = "63"
+	i.Width = 48
+	i.SetValue(initialValue)
+	i.CursorEnd()
+	i.Focus()
+
+	m.userInput = i
+	return
+}
+
+func (m model) Init() tea.Cmd {
+	return textinput.Blink
+}
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	if key, ok := msg.(tea.KeyMsg); ok {
+		switch key.Type {
+		case tea.KeyCtrlC, tea.KeyEscape, tea.KeyEnter:
+			return m, tea.Quit
+		}
+	}
+
+	var cmd tea.Cmd
+	m.userInput, cmd = m.userInput.Update(msg)
+	return m, cmd
+}
+
+func (m model) View() string {
+	return fmt.Sprintf(
+		"\nYou piped in: %s\n\nPress ^C to exit",
+		m.userInput.View(),
+	)
+}