mirror of https://gitlab.com/curben/blog
43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
'use strict'
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/* global hexo */
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/*
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* Embed an image with responsive images in a post
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* https://developer.mozilla.org/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images
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* Image is resized on-the-fly using Statically (https://statically.io/)
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* Usage: 
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*/
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const { join } = require('path').posix
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hexo.extend.filter.register('marked:renderer', (renderer) => {
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renderer.image = (href, title, alt) => {
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if (!alt) alt = ''
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if (!title) title = alt
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if (href.endsWith('.svg')) return `<img class="svg" src="${href}" alt="${alt}" title="${title}">`
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// embed external image
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if (href.startsWith('http')) return `<img src="${href}" alt="${alt}" title="${title}">`
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const fLink = (path, width) => {
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const query = new URLSearchParams('f=auto')
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if (typeof width === 'number') query.set('width', width)
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const url = new URL('http://example.com/' + join('img', path) + '?' + query)
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return url.pathname + url.search
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}
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return `<a href="${join('/img', href)}">` +
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`<img srcset="${fLink(href, 320)} 320w,` +
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`${fLink(href, 468)} 468w,` +
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`${fLink(href, 768)} 768w,` +
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`${fLink(href)} 800w"` +
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' sizes="(max-width: 320px) 320px,' +
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'(max-width: 468px) 468px,' +
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'(max-width: 768px) 768px,' +
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'800px"' +
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` src="${fLink(href)}" title="${title}" alt="${alt}" loading="lazy"></a>`
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}
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})
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