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// Color and theming utility functions! Handy.
// Graciously stolen from https://stackoverflow.com/a/54071699! ::::)
// in: r,g,b in [0,1], out: h in [0,360) and s,l in [0,1]
export function rgb2hsl(r, g, b) {
let a=Math.max(r,g,b), n=a-Math.min(r,g,b), f=(1-Math.abs(a+a-n-1));
let h= n && ((a==r) ? (g-b)/n : ((a==g) ? 2+(b-r)/n : 4+(r-g)/n));
return [60*(h<0?h+6:h), f ? n/f : 0, (a+a-n)/2];
}
export function getColors(primary) {
const [ r, g, b ] = primary.slice(1)
.match(/[0-9a-fA-F]{2,2}/g)
.slice(0, 3)
.map(val => parseInt(val, 16) / 255);
const [ h, s, l ] = rgb2hsl(r, g, b);
const dim = `hsl(${Math.round(h)}deg, ${Math.round(s * 50)}%, ${Math.round(l * 80)}%)`;
return {primary, dim};
}
export function getLinkThemeString(color) {
if (!color) return '';
const { primary, dim } = getColors(color);
return `--primary-color: ${primary}; --dim-color: ${dim}`;
}
export function getThemeString(color, additionalVariables = []) {
if (!color) return '';
const { primary, dim } = getColors(color);
const variables = [
`--primary-color: ${primary}`,
`--dim-color: ${dim}`,
...additionalVariables
].filter(Boolean);
if (!variables.length) return '';
return (
`:root {\n` +
variables.map(line => ` ` + line + ';\n').join('') +
`}`
);
}
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