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package viinput
import (
"strings"
tea "charm.land/bubbletea/v2"
)
// Mode represents the current vi-style input state.
type Mode int
const (
// ModeInsert accepts normal text entry and cursor editing keys.
ModeInsert Mode = iota
// ModeNormal accepts vi-style commands.
ModeNormal
)
// Model is the state container for the vi-style input component.
type Model struct {
Prompt string
runes []rune
cursor int
mode Mode
focused bool
pending rune
history [][]rune
wantsExit bool
}
// New returns a Model initialized for insert mode.
func New() Model {
return Model{mode: ModeInsert}
}
// Focus marks the model as active and returns a no-op command.
func (m *Model) Focus() tea.Cmd {
m.focused = true
m.mode = ModeInsert
m.pending = 0
m.wantsExit = false
return nil
}
// Blur marks the model as inactive.
func (m *Model) Blur() {
m.focused = false
m.pending = 0
m.wantsExit = false
}
// SetValue replaces the current buffer contents.
func (m *Model) SetValue(value string) {
m.runes = []rune(value)
m.cursor = len(m.runes)
m.pending = 0
m.wantsExit = false
}
// Value returns the current buffer contents.
func (m Model) Value() string {
return string(m.runes)
}
// Mode returns the current editing mode.
func (m Model) Mode() Mode {
return m.mode
}
// WantsExit reports whether normal mode requested that editing end.
func (m Model) WantsExit() bool {
return m.wantsExit
}
// Update applies a key event to the model.
func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
keyMsg, ok := msg.(tea.KeyPressMsg)
if !ok || !m.focused {
return m, nil
}
if m.mode == ModeNormal && m.pending != 0 {
m.handlePendingNormal(keyMsg)
m.pending = 0
return m, nil
}
switch m.mode {
case ModeInsert:
return m.updateInsertMode(keyMsg)
case ModeNormal:
return m.updateNormalMode(keyMsg)
default:
return m, nil
}
}
// View renders the prompt, value and cursor.
func (m Model) View() string {
var builder strings.Builder
builder.WriteString(m.Prompt)
cursorRune := "█"
if m.mode == ModeInsert {
cursorRune = "▏"
}
cursor := clampInt(m.cursor, 0, len(m.runes))
builder.WriteString(string(m.runes[:cursor]))
builder.WriteString(cursorRune)
builder.WriteString(string(m.runes[cursor:]))
return builder.String()
}
func (m Model) updateInsertMode(keyMsg tea.KeyPressMsg) (Model, tea.Cmd) {
switch keyMsg.String() {
case "esc":
m.mode = ModeNormal
m.pending = 0
case "left":
m.cursor = clampInt(m.cursor-1, 0, len(m.runes))
case "right":
m.cursor = clampInt(m.cursor+1, 0, len(m.runes))
case "home", "ctrl+a":
m.cursor = 0
case "end", "ctrl+e":
m.cursor = len(m.runes)
case "backspace", "ctrl+h":
m.deleteBeforeCursor()
case "delete", "ctrl+d":
m.deleteAtCursor()
default:
if text, ok := insertedText(keyMsg); ok {
m.insertText(text)
}
}
return m, nil
}
func (m Model) updateNormalMode(keyMsg tea.KeyPressMsg) (Model, tea.Cmd) {
switch keyMsg.String() {
case "esc":
m.wantsExit = true
return m, nil
case "h", "left":
m.cursor = clampInt(m.cursor-1, 0, len(m.runes))
case "l", "right":
m.cursor = clampInt(m.cursor+1, 0, len(m.runes))
case "w":
m.cursor = wordForward(m.runes, m.cursor)
case "b":
m.cursor = wordBackward(m.runes, m.cursor)
case "e":
m.cursor = wordEnd(m.runes, m.cursor)
case "0":
m.cursor = 0
case "$":
m.cursor = len(m.runes)
case "g":
m.pending = 'g'
case "d":
m.pending = 'd'
case "i":
m.mode = ModeInsert
case "a":
m.cursor = clampInt(m.cursor+1, 0, len(m.runes))
m.mode = ModeInsert
case "I":
m.cursor = 0
m.mode = ModeInsert
case "A":
m.cursor = len(m.runes)
m.mode = ModeInsert
case "x":
m.deleteAtCursor()
case "X":
m.deleteBeforeCursor()
case "D":
m.deleteToLineEnd()
case "C":
m.changeToLineEnd()
case "u":
m.undo()
default:
m.pending = 0
}
return m, nil
}
func (m *Model) handlePendingNormal(keyMsg tea.KeyPressMsg) {
switch m.pending {
case 'g':
switch keyMsg.String() {
case "g", "h":
m.cursor = 0
case "l":
m.cursor = len(m.runes)
}
case 'd':
switch keyMsg.String() {
case "d":
m.deleteLine()
case "w":
m.deleteWordForward()
case "e":
m.deleteWordEnd()
case "b":
m.deleteWordBackward()
case "0":
m.deleteFromLineStart()
case "$":
m.deleteToLineEnd()
}
}
}
func insertedText(keyMsg tea.KeyPressMsg) (string, bool) {
text := keyMsg.Text
if text != "" {
return text, true
}
value := keyMsg.String()
if len([]rune(value)) == 1 {
return value, true
}
return "", false
}
func clampInt(value, min, max int) int {
if value < min {
return min
}
if value > max {
return max
}
return value
}
|
