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feat: configurable price gradients #345

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b48175b
feat: configurable price gradients
brunofjesus Feb 10, 2026
0609add
feat: dynamic theme switching
brunofjesus Feb 10, 2026
0fc8869
feat: minor performance optimizations
brunofjesus Feb 11, 2026
d590055
fix: remove unnecessary pointers
brunofjesus Feb 11, 2026
49059cb
docs: add price-color-scheme to readme
brunofjesus Mar 10, 2026
0887342
fix: use correct tag default color
brunofjesus Mar 10, 2026
d4cdfcd
Merge branch 'achannarasappa:master' into feat/light-colors
brunofjesus Apr 30, 2026
702cdc2
chore: linting fixes
brunofjesus Apr 30, 2026
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11 changes: 11 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,17 @@ colors:
text-line: "#00ffff"
text-tag: "#005fff"
background-tag: "#0087ff"
price-color-scheme:
light:
positive-start: "#22C55E"
positive-end: "#15803D"
negative-start: "#EF4444"
negative-end: "#B91C1C"
dark:
positive-start: "#C6FF40"
positive-end: "#779929"
negative-start: "#FF7940"
negative-end: "#994926"
```

* Terminals supporting TrueColor will be able to represent the full color space and in other cases colors will be down sampled
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28 changes: 22 additions & 6 deletions internal/common/common.go
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Expand Up @@ -36,12 +36,28 @@ type Config struct {

// ConfigColorScheme represents user defined color scheme
type ConfigColorScheme struct {
Text string `yaml:"text"`
TextLight string `yaml:"text-light"`
TextLabel string `yaml:"text-label"`
TextLine string `yaml:"text-line"`
TextTag string `yaml:"text-tag"`
BackgroundTag string `yaml:"background-tag"`
Text string `yaml:"text"`
TextLight string `yaml:"text-light"`
TextLabel string `yaml:"text-label"`
TextLine string `yaml:"text-line"`
TextTag string `yaml:"text-tag"`
BackgroundTag string `yaml:"background-tag"`
PriceColorScheme ConfigPriceColorSchemeGroup `yaml:"price-color-scheme"`
}

// ConfigPriceColorSchemeGroup represents user defined price color scheme for light and dark mode
type ConfigPriceColorSchemeGroup struct {
Light ConfigPriceColorScheme `yaml:"light"`
Dark ConfigPriceColorScheme `yaml:"dark"`
}

// ConfigPriceColorScheme represents user defined price color scheme with start and end colors
// for positive and negative price changes
type ConfigPriceColorScheme struct {
PositiveStart string `yaml:"positive-start"`
PositiveEnd string `yaml:"positive-end"`
NegativeStart string `yaml:"negative-start"`
NegativeEnd string `yaml:"negative-end"`
}

type ConfigAssetGroup struct {
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133 changes: 87 additions & 46 deletions internal/ui/util/style.go
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Expand Up @@ -11,15 +11,40 @@ import (

const (
maxPercentChangeColorGradient = 10
strongChangeThreshold = 10.0
mediumChangeThreshold = 5.0
)

//nolint:gochecknoglobals
var (
p = te.ColorProfile()
stylePricePositive = newStyleFromGradient("#C6FF40", "#779929")
stylePriceNegative = newStyleFromGradient("#FF7940", "#994926")
p = te.ColorProfile()
colorRegex = regexp.MustCompile(`^#(?:[0-9a-fA-F]{3}){1,2}$`)
)

//nolint:gochecknoglobals
var defaultColorScheme = c.ConfigColorScheme{
Text: "#d0d0d0",
TextLight: "#8a8a8a",
TextLabel: "#626262",
TextLine: "#3a3a3a",
BackgroundTag: "#303030",
TextTag: "#8a8a8a",
PriceColorScheme: c.ConfigPriceColorSchemeGroup{
Light: c.ConfigPriceColorScheme{
PositiveStart: "#22C55E",
PositiveEnd: "#15803D",
NegativeStart: "#EF4444",
NegativeEnd: "#B91C1C",
},
Dark: c.ConfigPriceColorScheme{
PositiveStart: "#C6FF40",
PositiveEnd: "#779929",
NegativeStart: "#FF7940",
NegativeEnd: "#994926",
},
},
}

// NewStyle creates a new predefined style function
func NewStyle(fg string, bg string, bold bool) func(string) string {
s := te.Style{}.Foreground(p.Color(fg)).Background(p.Color(bg))
Expand All @@ -30,115 +55,131 @@ func NewStyle(fg string, bg string, bold bool) func(string) string {
return s.Styled
}

func stylePrice(percent float64, text string) string { //nolint:cyclop
func getStylePriceFn(colorScheme c.ConfigPriceColorScheme) func(float64, string) string {
positiveGradient := newStyleFromGradient(colorScheme.PositiveStart, colorScheme.PositiveEnd)
negativeGradient := newStyleFromGradient(colorScheme.NegativeStart, colorScheme.NegativeEnd)

out := te.String(text)
return func(percent float64, text string) string { //nolint:cyclop
if p == te.TrueColor && percent > 0.0 {
return positiveGradient(percent, text)
}

if percent == 0.0 {
return out.Foreground(p.Color("241")).String()
}

if p == te.TrueColor && percent > 0.0 {
return stylePricePositive(percent, text)
}
if p == te.TrueColor && percent < 0.0 {
return negativeGradient(percent, text)
}

if p == te.TrueColor && percent < 0.0 {
return stylePriceNegative(percent, text)
}
out := te.String(text)

if percent > 10.0 {
return out.Foreground(p.Color("70")).String()
}
if percent == 0.0 {
return out.Foreground(p.Color("241")).String()
}

if percent > 5 {
return out.Foreground(p.Color("76")).String()
}
if percent > strongChangeThreshold {
return out.Foreground(p.Color("70")).String()
}

if percent > 0.0 {
return out.Foreground(p.Color("82")).String()
}
if percent > mediumChangeThreshold {
return out.Foreground(p.Color("76")).String()
}

if percent < -10.0 {
return out.Foreground(p.Color("124")).String()
}
if percent > 0.0 {
return out.Foreground(p.Color("82")).String()
}

if percent < -5.0 {
return out.Foreground(p.Color("160")).String()
}
if percent < strongChangeThreshold*-1 {
return out.Foreground(p.Color("124")).String()
}

return out.Foreground(p.Color("196")).String()
if percent < mediumChangeThreshold*-1 {
return out.Foreground(p.Color("160")).String()
}

return out.Foreground(p.Color("196")).String()
}
}

func newStyleFromGradient(startColorHex string, endColorHex string) func(float64, string) string {
c1, _ := colorful.Hex(startColorHex)
c2, _ := colorful.Hex(endColorHex)

return func(percent float64, text string) string {

normalizedPercent := getNormalizedPercentWithMax(percent, maxPercentChangeColorGradient)
textColor := p.Color(c1.BlendHsv(c2, normalizedPercent).Hex())

return te.String(text).Foreground(textColor).String()

}
}

// Normalize 0-100 percent with a maximum percent value
func getNormalizedPercentWithMax(percent float64, maxPercent float64) float64 {

absolutePercent := math.Abs(percent)
if absolutePercent >= maxPercent {
return 1.0
}

return math.Abs(percent / maxPercent)

}

// GetColorScheme generates a color scheme based on user defined colors or defaults
func GetColorScheme(colorScheme c.ConfigColorScheme) c.Styles {
priceColorScheme := getPriceColorScheme(colorScheme)

return c.Styles{
Text: NewStyle(
getColorOrDefault(colorScheme.Text, "#d0d0d0"),
getColorOrDefault(colorScheme.Text, defaultColorScheme.Text),
"",
false,
),
TextLight: NewStyle(
getColorOrDefault(colorScheme.TextLight, "#8a8a8a"),
getColorOrDefault(colorScheme.TextLight, defaultColorScheme.TextLight),
"",
false,
),
TextBold: NewStyle(
getColorOrDefault(colorScheme.Text, "#d0d0d0"),
getColorOrDefault(colorScheme.Text, defaultColorScheme.Text),
"",
true,
),
TextLabel: NewStyle(
getColorOrDefault(colorScheme.TextLabel, "#626262"),
getColorOrDefault(colorScheme.TextLabel, defaultColorScheme.TextLabel),
"",
false,
),
TextLine: NewStyle(
getColorOrDefault(colorScheme.TextLine, "#3a3a3a"),
getColorOrDefault(colorScheme.TextLine, defaultColorScheme.TextLine),
"",
false,
),
TextPrice: stylePrice,
TextPrice: getStylePriceFn(priceColorScheme),
Tag: NewStyle(
getColorOrDefault(colorScheme.TextTag, "#8a8a8a"),
getColorOrDefault(colorScheme.BackgroundTag, "#303030"),
getColorOrDefault(colorScheme.TextTag, defaultColorScheme.TextTag),
getColorOrDefault(colorScheme.BackgroundTag, defaultColorScheme.BackgroundTag),
false,
),
}
}

// getPriceColorScheme returns the color scheme group for price changes based
// on user defined colors or defaults for light and dark mode
func getPriceColorScheme(colorScheme c.ConfigColorScheme) c.ConfigPriceColorScheme {
source := colorScheme.PriceColorScheme.Light
defaults := defaultColorScheme.PriceColorScheme.Light

if te.HasDarkBackground() {
source = colorScheme.PriceColorScheme.Dark
defaults = defaultColorScheme.PriceColorScheme.Dark
}

return c.ConfigPriceColorScheme{
PositiveStart: getColorOrDefault(source.PositiveStart, defaults.PositiveStart),
PositiveEnd: getColorOrDefault(source.PositiveEnd, defaults.PositiveEnd),
NegativeStart: getColorOrDefault(source.NegativeStart, defaults.NegativeStart),
NegativeEnd: getColorOrDefault(source.NegativeEnd, defaults.NegativeEnd),
}
}

func getColorOrDefault(colorConfig string, colorDefault string) string {
re := regexp.MustCompile(`^#(?:[0-9a-fA-F]{3}){1,2}$`)

if len(re.FindStringIndex(colorConfig)) > 0 {
if len(colorRegex.FindStringIndex(colorConfig)) > 0 {
return colorConfig
}

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