mirror of https://gitlab.com/curben/blog
48 lines
1.6 KiB
JavaScript
48 lines
1.6 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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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="${title}">`
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// embed external image
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if (!href.startsWith('20')) return `<img src="${href}" alt="${alt}" title="${title}">`
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// Statically doesn't support WebP and GIF
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if (href.endsWith('.webp')) {
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const gif = href.replace(/\.webp$/, '.gif')
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return `<a href="/files/${gif}"><picture>` +
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`<source srcset="/files/${href}" type="image/webp">` +
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`<img src="/files/${gif}" title="${title}" alt="${alt}" loading="lazy"></picture></a>`
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}
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const fLink = (str, width) => {
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if (typeof width === 'number') width = ',w=' + width.toString()
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else width = ''
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return '/img/gitlab.com/f=auto' + width + '/curben/blog/-/raw/site/' + str
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}
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return `<a href="${fLink(href)}">` +
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`<img srcset="${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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