textinput.go RawHistoryFolder

1package ui
2
3import (
4	renderer "github.com/bnema/vev-vt"
5	"github.com/bnema/vev/internal/domain"
6)
7
8// TextInput stores editable text as runes for terminal overlay input models.
9type TextInput struct {
10	runes []rune
11}
12
13func (t *TextInput) Insert(r rune) { t.runes = append(t.runes, r) }
14
15func (t *TextInput) Backspace() {
16	if len(t.runes) == 0 {
17		return
18	}
19	t.runes = t.runes[:len(t.runes)-1]
20}
21
22func (t *TextInput) Value() string { return string(t.runes) }
23
24func (t *TextInput) SetValue(value string) { t.runes = []rune(value) }
25
26// DrawInputLine draws prefix + value. The caret is not drawn: the daemon
27// places the real terminal cursor at InputCaret, so client predictive echo
28// can type ahead on the input line.
29func DrawInputLine(f renderer.Frame, y int, prefix, value string, style renderer.Style) {
30	if y < 0 || y >= f.Height {
31		return
32	}
33	DrawText(f, 0, y, f.Width, prefix+value, style)
34}
35
36// InputCaret is the caret column of an input line drawn by DrawInputLine on
37// row 0 of a frame of size inner. It reports false when the frame has no row
38// or prefix + value leaves no room for the caret, so a clipped line never
39// shows a misplaced cursor.
40func InputCaret(inner domain.Size, prefix, value string) (int, bool) {
41	col := 0
42	for _, r := range prefix + value {
43		col += renderer.RuneWidth(r)
44	}
45	return col, inner.Rows > 0 && col < inner.Cols
46}