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fix(tui): add ANSI-16 color fallbacks for SSH terminals

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Theme colors now use lipgloss.CompleteColor with hand-picked ANSI-16
values instead of raw hex. Prevents algorithmic degradation from
collapsing dark backgrounds into indistinguishable ANSI colors over
SSH. Backgrounds fall through to terminal default in 16-color mode;
semantic colors map to distinct ANSI indices (green/yellow/red/blue/
cyan/magenta). TrueColor rendering is unchanged.
This commit is contained in:
Tyler Koenig
2026-06-17 18:20:15 -04:00
parent adf8fed44f
commit 17606c238c
6 changed files with 160 additions and 138 deletions
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internal/tui/sparkline.go
+22 -10
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@@ -17,6 +17,17 @@ func parseHex(hex string) (r, g, b uint8) {
return
}
func trueColorHex(c lipgloss.TerminalColor) string {
switch v := c.(type) {
case lipgloss.CompleteColor:
return v.TrueColor
case lipgloss.Color:
return string(v)
default:
return ""
}
}
func dimColor(hex string, brightness float64) lipgloss.Color {
r, g, b := parseHex(hex)
f := 0.3 + brightness*0.7
@@ -27,35 +38,36 @@ func dimColor(hex string, brightness float64) lipgloss.Color {
))
}
func withBg(s lipgloss.Style, bg lipgloss.Color) lipgloss.Style {
if bg != "" {
func withBg(s lipgloss.Style, bg lipgloss.TerminalColor) lipgloss.Style {
if bg != nil {
return s.Background(bg)
}
return s
}
func (m Model) latencyStyle(ms int64, bg lipgloss.Color) lipgloss.Style {
var hex string
func (m Model) latencyStyle(ms int64, bg lipgloss.TerminalColor) lipgloss.Style {
var base lipgloss.TerminalColor
var t float64
switch {
case ms < 200:
hex = m.st.sparkSuccess
base = m.st.sparkSuccess
t = float64(ms) / 200
case ms < 500:
hex = m.st.sparkWarning
base = m.st.sparkWarning
t = float64(ms-200) / 300
default:
hex = m.st.sparkDanger
base = m.st.sparkDanger
t = float64(ms-500) / 1500
if t > 1 {
t = 1
}
}
hex := trueColorHex(base)
s := lipgloss.NewStyle().Foreground(dimColor(hex, t))
return withBg(s, bg)
}
func (m Model) latencySparkline(latencies []time.Duration, statuses []bool, width int, bg lipgloss.Color) string {
func (m Model) latencySparkline(latencies []time.Duration, statuses []bool, width int, bg lipgloss.TerminalColor) string {
if len(latencies) == 0 {
return withBg(m.st.subtleStyle, bg).Render(strings.Repeat("·", width))
}
@@ -103,7 +115,7 @@ func (m Model) latencySparkline(latencies []time.Duration, statuses []bool, widt
return sb.String()
}
func (m Model) heartbeatSparkline(statuses []bool, width int, bg lipgloss.Color) string {
func (m Model) heartbeatSparkline(statuses []bool, width int, bg lipgloss.TerminalColor) string {
if len(statuses) == 0 {
return withBg(m.st.subtleStyle, bg).Render(strings.Repeat("·", width))
}
@@ -143,7 +155,7 @@ func resolveSparklineIndex(x, sparkWidth, dataLen int) int {
return offset + (x - padding)
}
func (m Model) groupSparkline(groupID int, width int, bg lipgloss.Color) string {
func (m Model) groupSparkline(groupID int, width int, bg lipgloss.TerminalColor) string {
allSites := m.engine.GetAllSites()
var childStatuses [][]bool
for _, s := range allSites {