headsetcontrol-battery-widget/package/contents/ui/lib/helper.js

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const batteryLevel = batteryPercent => ({
"-2": "not connected",
"-1": "charging"
})[batteryPercent] ?? batteryPercent + "%";
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const batteryIcon = batteryPercent => ({
"-2": "action-unavailable",
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"-1": "reload"
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})[batteryPercent] ?? "audio-headphones-symbolic";
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const hex2rgb = (hex, h = hex.replace('#', '0x')) => ({ r: h >> 16 & 255, g: h >> 8 & 255, b: h & 255 });
const rgb2Hex = rgb => "#" + ((1 << 24) + (rgb.r << 16) + (rgb.g << 8) + rgb.b).toString(16).slice(1);
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const interpolateColor = (f, c) => {
if(!f) return "transparent";
if(f >= 1) return c.pop();
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if(f <= 0) return c.shift();
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f *= c.length - 1;
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const i = ~~f;
f -= i;
const [ c1, c2 ] = [ hex2rgb(c[i]), hex2rgb(c[i + 1]) ];
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return rgb2Hex({
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r: c1.r + ((c2.r - c1.r) * f) | 10,
g: c1.g + ((c2.g - c1.g) * f) | 10,
b: c1.b + ((c2.b - c1.b) * f) | 10
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});
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};