mirror of https://gitlab.com/curben/blog
70 lines
2.2 KiB
JavaScript
70 lines
2.2 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 Imgpx
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* https://statically.io/imgpx
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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 (href.endsWith('.svg')) return `<img class="svg" src="${href}" alt="${alt}">`
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if (!alt) alt = ''
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if (!title) title = alt
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let modern = href
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let legacy = href
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// /img/ is a reverse proxy to Statically CDN
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// See source/_redirects
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const link = '/img/'
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// embed external image
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if (!href.startsWith('20')) return `<img src="${href}" alt="${alt}" title="${title}">`
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if (href.endsWith('.png') || href.endsWith('.jpg')) {
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modern = href.concat('?format=webp')
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} else if (href.endsWith('.webp')) {
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// Statically has yet to support animated webp
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// https://github.com/marsble/statically/issues/36
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// modern = href.concat('?auto_format=false')
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modern = href.replace(/\.webp$/, '.gif')
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legacy = href.replace(/\.webp$/, '.gif')
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}
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const modernLink = link + modern
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const legacyLink = link + legacy
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const img = `<img srcset="${legacyLink}&w=320 320w,` +
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`${legacyLink}&w=468 468w,` +
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`${legacyLink}&w=768 768w,` +
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`${legacyLink} 800w"` +
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' sizes="(max-width: 320px) 320px,' +
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'(max-width: 468px) 468px,' +
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'(max-width: 768px) 768px,' +
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'800px"' +
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` src="${legacyLink}"` +
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` title="${title}" alt="${alt}" loading="lazy">`
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if (href.endsWith('.png') || href.endsWith('.webp')) {
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return `<a href="${legacyLink}">` +
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'<picture>' +
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'<source type="image/webp"' +
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` srcset="${modernLink}&w=320 320w,` +
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`${modernLink}&w=468 468w,` +
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`${modernLink}&w=768 768w,` +
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`${modernLink} 800w"` +
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' sizes="(max-width: 320px) 320px,' +
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'(max-width: 468px) 468px,' +
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'(max-width: 768px) 768px,' +
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'800px">' +
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`${img}` +
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'</picture></a>'
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} else {
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return `<a href="${legacyLink}">${img}</a>`
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}
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}
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})
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