74 lines
2.3 KiB
JavaScript
74 lines
2.3 KiB
JavaScript
import { DateTime } from "luxon";
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export default function(eleventyConfig) {
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// Return the keys used in an object
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eleventyConfig.addFilter("getKeys", target => {
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return Object.keys(target);
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});
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/* Exclude all posts with given URLs from a collection list */
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eleventyConfig.addFilter("excludeFromCollection", function (collection=[], urls=[this.ctx.page.url]) {
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return collection.filter(post => urls.indexOf(post.url) === -1);
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});
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/* Filter a collection by a set of tags, returning any that share one or more tags */
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eleventyConfig.addFilter("filterByTags", function(collection=[], ...requiredTags) {
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return collection.filter(post => {
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return requiredTags.flat().some(tag => post.data.tags.includes(tag));
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});
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});
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/* Return n elements from a list */
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eleventyConfig.addFilter("head", (collection=[], n) => {
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if(!Array.isArray(collection) || collection.length === 0) {
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return [];
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}
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if( n < 0 ) {
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return collection.slice(n);
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}
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return collection.slice(0, n);
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});
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/* For <time> elements */
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eleventyConfig.addFilter("htmlDateString", (dateObj) => {
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return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat('yyyy-LL-dd');
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});
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/* What it says on the tin */
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eleventyConfig.addFilter("randomize", function(array) {
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// Create a copy of the array to avoid modifying the original
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let shuffledArray = array.slice();
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// Fisher-Yates shuffle algorithm
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for (let i = shuffledArray.length - 1; i > 0; i--) {
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const j = Math.floor(Math.random() * (i + 1));
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[shuffledArray[i], shuffledArray[j]] = [shuffledArray[j], shuffledArray[i]];
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}
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return shuffledArray;
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});
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/* Human-readable dates */
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eleventyConfig.addFilter("readableDate", (dateObj, format, zone) => {
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return DateTime.fromJSDate(dateObj, { zone: zone || "utc" })
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.toLocaleString(DateTime.DATE_FULL);
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});
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/* Filter out structural tags */
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eleventyConfig.addFilter("removeBasicTags", (tags) => {
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return tags.filter(tag => ["all", "posts", "gallery", "reference", "tagPagination"].indexOf(tag) === -1);
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});
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/* What it says on the tin */
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eleventyConfig.addFilter("sortAlphabetically", strings =>
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(strings || []).sort((b, a) => b.localeCompare(a))
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);
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/* Remove year from image filenames for OG metadata file path */
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eleventyConfig.addFilter("toOgFilename", (filename) => {
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return filename.split("/")[1];
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});
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};
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