screen_cursor.go RawHistoryFolder

1package vt
2
3import (
4	"strconv"
5	"strings"
6
7	renderer "github.com/bnema/vev-vt/core"
8)
9
10type cursorState struct {
11	row        int
12	col        int
13	style      renderer.Style
14	originMode bool
15	insertMode bool
16	saved      bool
17}
18
19func (s *Screen) cursorReportRow() int {
20	if s.originMode {
21		return clamp(s.Row, s.cursorMinRow(), s.cursorMaxRow()) - s.cursorMinRow() + 1
22	}
23	return s.Row + 1
24}
25
26func (s *Screen) cursorMinRow() int {
27	if s.originMode {
28		return clamp(s.scrollTop, 0, s.frame.Height-1)
29	}
30	return 0
31}
32
33func (s *Screen) cursorMaxRow() int {
34	if s.originMode {
35		return clamp(s.scrollBottom, 0, s.frame.Height-1)
36	}
37	return max(s.frame.Height-1, 0)
38}
39
40func (s *Screen) addressedRow(row int) int {
41	if s.originMode {
42		return clamp(s.scrollTop+row-1, s.cursorMinRow(), s.cursorMaxRow())
43	}
44	return clamp(row-1, 0, s.frame.Height-1)
45}
46
47func (s *Screen) addressCursor(row, col int) {
48	s.Row = s.addressedRow(row)
49	s.Col = clamp(col-1, 0, s.frame.Width-1)
50}
51
52func (s *Screen) homeCursor() {
53	s.addressCursor(1, 1)
54}
55
56func (s *Screen) applyCursorStyle(params string) {
57	if strings.HasPrefix(params, ">") || !strings.HasSuffix(params, " ") {
58		return
59	}
60	styleParam := strings.TrimSuffix(params, " ")
61	style := 0
62	if styleParam != "" {
63		v, err := strconv.Atoi(styleParam)
64		if err != nil {
65			return
66		}
67		style = v
68	}
69	if style < 0 || style > 6 {
70		return
71	}
72	s.cursorStyle = style
73	s.cursorStyleSet = true
74}
75
76func (s *Screen) saveCursor() {
77	s.savedCursor = cursorState{row: s.Row, col: s.Col, style: s.Style, originMode: s.originMode, insertMode: s.insertMode, saved: true}
78}
79
80func (s *Screen) restoreCursor() {
81	if !s.savedCursor.saved {
82		return
83	}
84	s.Row = clamp(s.savedCursor.row, 0, s.frame.Height-1)
85	s.Col = clamp(s.savedCursor.col, 0, s.frame.Width-1)
86	s.Style = s.savedCursor.style
87	s.originMode = s.savedCursor.originMode
88	s.insertMode = s.savedCursor.insertMode
89}