Text input value getter/setter + cursor movement methods

examples/textinput/main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"log"
+
+	"github.com/charmbracelet/boba"
+	input "github.com/charmbracelet/boba/textinput"
+)
+
+type Model struct {
+	textInput input.Model
+	err       error
+}
+
+type tickMsg struct{}
+type errMsg error
+
+func main() {
+	p := boba.NewProgram(
+		initialize,
+		update,
+		view,
+	)
+
+	if err := p.Start(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func initialize() (boba.Model, boba.Cmd) {
+	inputModel := input.NewModel()
+	inputModel.Placeholder = "Pikachu"
+	inputModel.Focus()
+
+	return Model{
+		textInput: inputModel,
+		err:       nil,
+	}, input.Blink(inputModel)
+}
+
+func update(msg boba.Msg, model boba.Model) (boba.Model, boba.Cmd) {
+	var cmd boba.Cmd
+	m, ok := model.(Model)
+	if !ok {
+		// When we encounter errors in Update we simply add the error to the
+		// model so we can handle it in the view. We could also return a command
+		// that does something else with the error, like logs it via IO.
+		return Model{
+			err: errors.New("could not perform assertion on model in update"),
+		}, nil
+	}
+
+	switch msg := msg.(type) {
+	case boba.KeyMsg:
+		switch msg.Type {
+		case boba.KeyCtrlC:
+			fallthrough
+		case boba.KeyEsc:
+			fallthrough
+		case boba.KeyEnter:
+			return m, boba.Quit
+		}
+
+	// We handle errors just like any other message
+	case errMsg:
+		m.err = msg
+		return m, nil
+	}
+
+	m.textInput, cmd = input.Update(msg, m.textInput)
+	return m, cmd
+}
+
+func view(model boba.Model) string {
+	m, ok := model.(Model)
+	if !ok {
+		return "Oh no: could not perform assertion on model."
+	} else if m.err != nil {
+		return fmt.Sprintf("Uh oh: %s", m.err)
+	}
+	return fmt.Sprintf(
+		"What’s your favorite Pokémon?\n\n%s\n\n%s",
+		input.View(m.textInput),
+		"(esc to quit)",
+	) + "\n"
+}