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// transform /path/to/file.ext to file.ext
export function basename(path = '') {
return path ? path.replace(/^.*\//, '') : '';
}
// transform /path/to/file.ext to .ext
export function extname(path = '') {
const [_, ext] = /.+(\.[^.]+)$/.exec(path) || [];
return ext || '';
}
// join a list of path segments with slashes, ensuring no double slashes
export function joinPaths(...parts) {
let str = '';
for (const part of parts) {
if (!part) continue;
str = !str ? part : `${str.replace(/\/$/, '')}/${part.replace(/^\//, '')}`;
}
return str;
}
// test whether a variable is an object
export function isObject(obj) {
return Object.prototype.toString.call(obj) === '[object Object]';
}
// returns whether a dark theme is enabled
export function isDarkTheme() {
const style = window.getComputedStyle(document.documentElement);
return style.getPropertyValue('--is-dark-theme').trim().toLowerCase() === 'true';
}
// removes duplicate elements in an array
export function uniq(arr) {
return Array.from(new Set(arr));
}
// strip <tags> from a string
export function stripTags(text) {
return text.replace(/<[^>]*>?/gm, '');
}
// searches the inclusive range [minValue, maxValue].
// credits: https://matthiasott.com/notes/write-your-media-queries-in-pixels-not-ems
export function mqBinarySearch(feature, minValue, maxValue, step, unit) {
if (maxValue - minValue < step) {
return minValue;
}
const mid = Math.ceil((minValue + maxValue) / 2 / step) * step;
if (matchMedia(`screen and (min-${feature}:${mid}${unit})`).matches) {
return mqBinarySearch(feature, mid, maxValue, step, unit); // feature is >= mid
}
return mqBinarySearch(feature, minValue, mid - step, step, unit); // feature is < mid
}
export function parseIssueHref(href) {
const path = (href || '').replace(/[#?].*$/, '');
const [_, owner, repo, type, index] = /([^/]+)\/([^/]+)\/(issues|pulls)\/([0-9]+)/.exec(path) || [];
return {owner, repo, type, index};
}
// return the sub-match result as an array: [unmatched, matched, unmatched, matched, ...]
// res[even] is unmatched, res[odd] is matched, see unit tests for examples
export function strSubMatch(full, sub) {
const res = [''];
let i = 0, j = 0;
const subLower = sub.toLowerCase(), fullLower = full.toLowerCase();
while (i < subLower.length && j < fullLower.length) {
if (subLower[i] === fullLower[j]) {
if (res.length % 2 !== 0) res.push('');
res[res.length - 1] += full[j];
j++;
i++;
} else {
if (res.length % 2 === 0) res.push('');
res[res.length - 1] += full[j];
j++;
}
}
if (i !== sub.length) {
// if the sub string doesn't match the full, only return the full as unmatched.
return [full];
}
if (j < full.length) {
// append remaining chars from full to result as unmatched
if (res.length % 2 === 0) res.push('');
res[res.length - 1] += full.substring(j);
}
return res;
}
// pretty-print a number using locale-specific separators, e.g. 1200 -> 1,200
export function prettyNumber(num, locale = 'en-US') {
if (typeof num !== 'number') return '';
const {format} = new Intl.NumberFormat(locale);
return format(num);
}
// parse a URL, either relative '/path' or absolute 'https://localhost/path'
export function parseUrl(str) {
return new URL(str, str.startsWith('http') ? undefined : window.location.origin);
}
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