138 lines
4.3 KiB
JavaScript
138 lines
4.3 KiB
JavaScript
// transform /path/to/file.ext to file.ext
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export function basename(path = '') {
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return path ? path.replace(/^.*\//, '') : '';
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}
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// transform /path/to/file.ext to .ext
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export function extname(path = '') {
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const [_, ext] = /.+(\.[^.]+)$/.exec(path) || [];
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return ext || '';
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}
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// join a list of path segments with slashes, ensuring no double slashes
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export function joinPaths(...parts) {
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let str = '';
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for (const part of parts) {
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if (!part) continue;
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str = !str ? part : `${str.replace(/\/$/, '')}/${part.replace(/^\//, '')}`;
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}
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return str;
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}
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// test whether a variable is an object
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export function isObject(obj) {
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return Object.prototype.toString.call(obj) === '[object Object]';
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}
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// returns whether a dark theme is enabled
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export function isDarkTheme() {
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const style = window.getComputedStyle(document.documentElement);
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return style.getPropertyValue('--is-dark-theme').trim().toLowerCase() === 'true';
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}
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// strip <tags> from a string
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export function stripTags(text) {
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return text.replace(/<[^>]*>?/g, '');
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}
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// searches the inclusive range [minValue, maxValue].
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// credits: https://matthiasott.com/notes/write-your-media-queries-in-pixels-not-ems
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export function mqBinarySearch(feature, minValue, maxValue, step, unit) {
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if (maxValue - minValue < step) {
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return minValue;
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}
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const mid = Math.ceil((minValue + maxValue) / 2 / step) * step;
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if (matchMedia(`screen and (min-${feature}:${mid}${unit})`).matches) {
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return mqBinarySearch(feature, mid, maxValue, step, unit); // feature is >= mid
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}
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return mqBinarySearch(feature, minValue, mid - step, step, unit); // feature is < mid
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}
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export function parseIssueHref(href) {
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const path = (href || '').replace(/[#?].*$/, '');
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const [_, owner, repo, type, index] = /([^/]+)\/([^/]+)\/(issues|pulls)\/([0-9]+)/.exec(path) || [];
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return {owner, repo, type, index};
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}
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// parse a URL, either relative '/path' or absolute 'https://localhost/path'
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export function parseUrl(str) {
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return new URL(str, str.startsWith('http') ? undefined : window.location.origin);
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}
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// return current locale chosen by user
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function getCurrentLocale() {
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return document.documentElement.lang;
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}
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// given a month (0-11), returns it in the documents language
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export function translateMonth(month) {
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return new Date(Date.UTC(2022, month, 12)).toLocaleString(getCurrentLocale(), {month: 'short', timeZone: 'UTC'});
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}
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// given a weekday (0-6, Sunday to Saturday), returns it in the documents language
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export function translateDay(day) {
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return new Date(Date.UTC(2022, 7, day)).toLocaleString(getCurrentLocale(), {weekday: 'short', timeZone: 'UTC'});
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}
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// convert a Blob to a DataURI
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export function blobToDataURI(blob) {
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return new Promise((resolve, reject) => {
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try {
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const reader = new FileReader();
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reader.addEventListener('load', (e) => {
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resolve(e.target.result);
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});
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reader.addEventListener('error', () => {
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reject(new Error('FileReader failed'));
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});
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reader.readAsDataURL(blob);
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} catch (err) {
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reject(err);
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}
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});
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}
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// convert image Blob to another mime-type format.
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export function convertImage(blob, mime) {
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return new Promise(async (resolve, reject) => {
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try {
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const img = new Image();
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const canvas = document.createElement('canvas');
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img.addEventListener('load', () => {
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try {
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canvas.width = img.naturalWidth;
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canvas.height = img.naturalHeight;
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const context = canvas.getContext('2d');
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context.drawImage(img, 0, 0);
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canvas.toBlob((blob) => {
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if (!(blob instanceof Blob)) return reject(new Error('imageBlobToPng failed'));
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resolve(blob);
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}, mime);
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} catch (err) {
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reject(err);
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}
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});
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img.addEventListener('error', () => {
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reject(new Error('imageBlobToPng failed'));
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});
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img.src = await blobToDataURI(blob);
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} catch (err) {
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reject(err);
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}
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});
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}
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export function toAbsoluteUrl(url) {
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if (url.startsWith('http://') || url.startsWith('https://')) {
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return url;
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}
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if (url.startsWith('//')) {
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return `${window.location.protocol}${url}`; // it's also a somewhat absolute URL (with the current scheme)
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}
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if (url && !url.startsWith('/')) {
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throw new Error('unsupported url, it should either start with / or http(s)://');
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}
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return `${window.location.origin}${url}`;
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}
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