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package util
import (
"math"
"os"
"strings"
"time"
"github.com/charmbracelet/lipgloss/v2"
"github.com/charmbracelet/lipgloss/v2/compat"
"github.com/sst/opencode/internal/styles"
)
var (
shimmerStart = time.Now()
trueColorSupport = hasTrueColor()
)
// Shimmer renders text with a moving foreground highlight.
// bg is the background color, dim is the base text color, bright is the highlight color.
func Shimmer(s string, bg compat.AdaptiveColor, _ compat.AdaptiveColor, _ compat.AdaptiveColor) string {
if s == "" {
return ""
}
runes := []rune(s)
n := len(runes)
if n == 0 {
return s
}
pad := 10
period := float64(n + pad*2)
sweep := 2.5
elapsed := time.Since(shimmerStart).Seconds()
pos := (math.Mod(elapsed, sweep) / sweep) * period
half := 2.0
type seg struct {
useHex bool
hex string
bold bool
faint bool
text string
}
segs := make([]seg, 0, n/4)
useHex := trueColorSupport
for i, r := range runes {
ip := float64(i + pad)
dist := math.Abs(ip - pos)
bold := false
faint := true
hex := ""
if dist <= half {
// Simple 3-level brightness based on distance
if dist <= half/3 {
// Center: brightest
bold = true
faint = false
if useHex {
hex = "#ffffff"
}
} else {
// Edge: medium bright
bold = false
faint = false
if useHex {
hex = "#cccccc"
}
}
}
if len(segs) == 0 ||
segs[len(segs)-1].useHex != useHex ||
segs[len(segs)-1].hex != hex ||
segs[len(segs)-1].bold != bold ||
segs[len(segs)-1].faint != faint {
segs = append(segs, seg{useHex: useHex, hex: hex, bold: bold, faint: faint, text: string(r)})
} else {
segs[len(segs)-1].text += string(r)
}
}
baseStyle := styles.NewStyle().Background(bg)
var b strings.Builder
b.Grow(len(s) * 2)
for _, g := range segs {
st := baseStyle
if g.useHex && g.hex != "" {
c := compat.AdaptiveColor{Dark: lipgloss.Color(g.hex), Light: lipgloss.Color(g.hex)}
st = st.Foreground(c)
}
if g.bold {
st = st.Bold(true)
}
if g.faint {
st = st.Faint(true)
}
b.WriteString(st.Render(g.text))
}
return b.String()
}
func hasTrueColor() bool {
c := strings.ToLower(os.Getenv("COLORTERM"))
return strings.Contains(c, "truecolor") || strings.Contains(c, "24bit")
}
func rgbHex(r, g, b int) string {
if r < 0 {
r = 0
}
if r > 255 {
r = 255
}
if g < 0 {
g = 0
}
if g > 255 {
g = 255
}
if b < 0 {
b = 0
}
if b > 255 {
b = 255
}
return "#" + hex2(r) + hex2(g) + hex2(b)
}
func hex2(v int) string {
const digits = "0123456789abcdef"
return string([]byte{digits[(v>>4)&0xF], digits[v&0xF]})
}
|
