find_highlight.go RawHistoryFolder

1package theme
2
3import (
4	"fmt"
5	"strconv"
6	"strings"
7)
8
9// GenerateFindHighlightCSS builds CSS to style find-in-page matches using the accent color.
10func GenerateFindHighlightCSS(p Palette) string {
11	accent := strings.TrimSpace(p.Accent)
12	const highlightDimAlpha = 0.5
13	dim := rgbaFromHex(accent, highlightDimAlpha)
14	active := accent
15
16	return fmt.Sprintf(`/* Find highlight styling */
17::-webkit-search-results {
18	background-color: %s !important;
19}
20
21::-webkit-search-results-decoration {
22	background-color: %s !important;
23}
24
25::selection {
26	background-color: %s !important;
27}
28`, dim, active, active)
29}
30
31func rgbaFromHex(hex string, alpha float64) string {
32	if len(hex) != 7 || !strings.HasPrefix(hex, "#") {
33		return hex
34	}
35
36	r, rOK := parseHexByte(hex[1:3])
37	g, gOK := parseHexByte(hex[3:5])
38	b, bOK := parseHexByte(hex[5:7])
39	if !rOK || !gOK || !bOK {
40		return hex
41	}
42
43	if alpha < 0 {
44		alpha = 0
45	}
46	if alpha > 1 {
47		alpha = 1
48	}
49
50	return fmt.Sprintf("rgba(%d, %d, %d, %.2f)", r, g, b, alpha)
51}
52
53func parseHexByte(value string) (uint64, bool) {
54	parsed, err := strconv.ParseUint(value, 16, 8)
55	if err != nil {
56		return 0, false
57	}
58	return parsed, true
59}