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// Package write provides a shell script interface for the text area bubble.
// https://github.com/charmbracelet/bubbles/tree/master/textarea
//
// It can be used to ask the user to write some long form of text (multi-line)
// input. The text the user entered will be sent to stdout.
// Text entry is completed with CTRL+D and aborted with CTRL+C or Escape.
//
// $ gum write > output.text
package write
import (
"io"
"os"
"github.com/charmbracelet/bubbles/help"
"github.com/charmbracelet/bubbles/key"
"github.com/charmbracelet/bubbles/textarea"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
"github.com/charmbracelet/x/editor"
)
type keymap struct {
textarea.KeyMap
Submit key.Binding
Quit key.Binding
Abort key.Binding
OpenInEditor key.Binding
}
// FullHelp implements help.KeyMap.
func (k keymap) FullHelp() [][]key.Binding { return nil }
// ShortHelp implements help.KeyMap.
func (k keymap) ShortHelp() []key.Binding {
return []key.Binding{
k.InsertNewline,
k.OpenInEditor,
k.Submit,
}
}
func defaultKeymap() keymap {
km := textarea.DefaultKeyMap
km.InsertNewline = key.NewBinding(
key.WithKeys("ctrl+j"),
key.WithHelp("ctrl+j", "insert newline"),
)
return keymap{
KeyMap: km,
Quit: key.NewBinding(
key.WithKeys("esc"),
key.WithHelp("esc", "quit"),
),
Abort: key.NewBinding(
key.WithKeys("ctrl+c"),
key.WithHelp("ctrl+c", "cancel"),
),
OpenInEditor: key.NewBinding(
key.WithKeys("ctrl+e"),
key.WithHelp("ctrl+e", "open editor"),
),
Submit: key.NewBinding(
key.WithKeys("enter"),
key.WithHelp("enter", "submit"),
),
}
}
type model struct {
autoWidth bool
header string
headerStyle lipgloss.Style
quitting bool
submitted bool
textarea textarea.Model
showHelp bool
help help.Model
keymap keymap
padding []int
}
func (m model) Init() tea.Cmd { return textarea.Blink }
func (m model) View() string {
if m.quitting {
return ""
}
var parts []string
// Display the header above the text area if it is not empty.
if m.header != "" {
parts = append(parts, m.headerStyle.Render(m.header))
}
parts = append(parts, m.textarea.View())
if m.showHelp {
parts = append(parts, "", m.help.View(m.keymap))
}
return lipgloss.NewStyle().
Padding(m.padding...).
Render(lipgloss.JoinVertical(
lipgloss.Left,
parts...,
))
}
func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
switch msg := msg.(type) {
case tea.WindowSizeMsg:
if m.autoWidth {
m.textarea.SetWidth(msg.Width - m.padding[1] - m.padding[3])
}
case tea.FocusMsg, tea.BlurMsg:
var cmd tea.Cmd
m.textarea, cmd = m.textarea.Update(msg)
return m, cmd
case startEditorMsg:
return m, openEditor(msg.path, msg.lineno)
case editorFinishedMsg:
if msg.err != nil {
m.quitting = true
return m, tea.Interrupt
}
m.textarea.SetValue(msg.content)
case tea.KeyMsg:
km := m.keymap
switch {
case key.Matches(msg, km.Abort):
m.quitting = true
return m, tea.Interrupt
case key.Matches(msg, km.Quit):
m.quitting = true
return m, tea.Quit
case key.Matches(msg, km.Submit):
m.quitting = true
m.submitted = true
return m, tea.Quit
case key.Matches(msg, km.OpenInEditor):
//nolint: gosec
return m, createTempFile(m.textarea.Value(), uint(m.textarea.Line())+1)
}
}
var cmd tea.Cmd
m.textarea, cmd = m.textarea.Update(msg)
return m, cmd
}
type startEditorMsg struct {
path string
lineno uint
}
type editorFinishedMsg struct {
content string
err error
}
func createTempFile(content string, lineno uint) tea.Cmd {
return func() tea.Msg {
f, err := os.CreateTemp("", "gum.*.md")
if err != nil {
return editorFinishedMsg{err: err}
}
_, err = io.WriteString(f, content)
if err != nil {
return editorFinishedMsg{err: err}
}
_ = f.Close()
return startEditorMsg{
path: f.Name(),
lineno: lineno,
}
}
}
func openEditor(path string, lineno uint) tea.Cmd {
cb := func(err error) tea.Msg {
if err != nil {
return editorFinishedMsg{
err: err,
}
}
bts, err := os.ReadFile(path)
if err != nil {
return editorFinishedMsg{err: err}
}
return editorFinishedMsg{
content: string(bts),
}
}
cmd, err := editor.Cmd(
"Gum",
path,
editor.LineNumber(int(lineno)),
editor.EndOfLine(),
)
if err != nil {
return func() tea.Msg { return cb(err) }
}
return tea.ExecProcess(cmd, cb)
}
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