blog/scripts/cloudinary.js

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'use strict'
/* global hexo */
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/*
* Put {% cloudinary 'folder/filename.jpg' 'description' %} in your post.
* Change the username in 'user' variable
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* More info:
* https://cloudinary.com/blog/responsive_images_with_srcset_sizes_and_cloudinary
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*/
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hexo.extend.tag.register('cloudinary', (args) => {
const user = 'curben'
const fileName = args[0]
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const alt = args[1] || ''
let modern = ''
let legacy = ''
const cloudinary = 'https://res.cloudinary.com/' + user +
'/image/upload/f_auto,q_auto'
if (fileName.endsWith('.png')) {
modern = fileName.replace(/\.png$/, '.webp')
legacy = fileName
} else if (fileName.endsWith('.webp')) {
modern = fileName
legacy = fileName.replace(/\.webp$/, '.gif')
} else {
legacy = fileName
}
const img = `<img
srcset="${cloudinary}/c_limit,w_320/${legacy} 320w,
${cloudinary}/c_limit,w_468/${legacy} 468w,
${cloudinary}/c_limit,w_768/${legacy} 768w,
${cloudinary}/${legacy} 800w"
sizes="(max-width: 320px) 320px,
(max-width: 468px) 468px,
(max-width: 768px) 768px,
800px">
src="${cloudinary}w_768/${legacy}"
alt="${alt}">`
if (fileName.endsWith('.png') || fileName.endsWith('.webp')) {
return `<a href="https://res.cloudinary.com/curben/${fileName}">
<picture>
<source type="image/webp"
srcset="${cloudinary}/c_limit,w_320/${modern} 320w,
${cloudinary}/c_limit,w_468/${modern} 468w,
${cloudinary}/c_limit,w_768/${modern} 768w,
${cloudinary}/${modern} 800w"
sizes="(max-width: 320px) 320px,
(max-width: 468px) 468px,
(max-width: 768px) 768px,
800px">
${img}
</picture></a>`
} else {
return `<a href="https://res.cloudinary.com/curben/${fileName}">
${img}</a>`
}
})