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main.go
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package main
// A simple program demonstrating the textarea component from the Bubbles
// component library.
import (
"log"
"strings"
"charm.land/bubbles/v2/textarea"
tea "charm.land/bubbletea/v2"
"charm.land/lipgloss/v2"
)
func main() {
p := tea.NewProgram(initialModel())
if _, err := p.Run(); err != nil {
log.Fatal(err)
}
}
type errMsg error
type model struct {
textarea textarea.Model
err error
}
func initialModel() model {
ti := textarea.New()
ti.Placeholder = "Once upon a time..."
ti.SetVirtualCursor(false)
ti.SetStyles(textarea.DefaultStyles(true)) // default to dark styles.
ti.Focus()
return model{
textarea: ti,
err: nil,
}
}
func (m model) Init() tea.Cmd {
return tea.Batch(textarea.Blink, tea.RequestBackgroundColor)
}
func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
var cmds []tea.Cmd
var cmd tea.Cmd
switch msg := msg.(type) {
case tea.BackgroundColorMsg:
// Update styling now that we know the background color.
m.textarea.SetStyles(textarea.DefaultStyles(msg.IsDark()))
case tea.KeyPressMsg:
switch msg.String() {
case "esc":
if m.textarea.Focused() {
m.textarea.Blur()
}
case "ctrl+c":
return m, tea.Quit
default:
if !m.textarea.Focused() {
cmd = m.textarea.Focus()
cmds = append(cmds, cmd)
}
}
// We handle errors just like any other message
case errMsg:
m.err = msg
return m, nil
}
m.textarea, cmd = m.textarea.Update(msg)
cmds = append(cmds, cmd)
return m, tea.Batch(cmds...)
}
func (m model) headerView() string {
return "Tell me a story.\n"
}
func (m model) View() tea.View {
const (
footer = "\n(ctrl+c to quit)\n"
)
var c *tea.Cursor
if !m.textarea.VirtualCursor() {
c = m.textarea.Cursor()
// Set the y offset of the cursor based on the position of the textarea
// in the application.
offset := lipgloss.Height(m.headerView())
c.Y += offset
}
f := strings.Join([]string{
m.headerView(),
m.textarea.View(),
footer,
}, "\n")
v := tea.NewView(f)
v.Cursor = c
return v
}