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Fork of Chiri for Astro for my blog forked from quillmatiq.com/augment
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/** * Rehype plugin that processes images in markdown content: * - Wraps images with alt text in figure/figcaption elements * - Adds data-preview attribute for image viewer functionality * - Adds lazy loading for better performance * - Handles multiple images in a single paragraph */export default function rehypeImageProcessor() { return (tree) => { visit(tree, 'element', (node, index, parent) => { if (node.tagName !== 'p') { return } if (!parent || typeof index !== 'number') { return }
const imgNodes = [] let hasNonImageContent = false
for (const child of node.children) { if (child.type === 'element' && child.tagName === 'img') { imgNodes.push(child) } else if (child.type !== 'text' || child.value.trim() !== '') { hasNonImageContent = true } }
if (hasNonImageContent || imgNodes.length === 0) { return }
const newNodes = []
for (const imgNode of imgNodes) { const alt = imgNode.properties?.alt?.trim()
// Enhanced image properties with performance optimizations imgNode.properties = { ...imgNode.properties, 'data-preview': themeConfig.post.imageViewer ? 'true' : 'false', // Add lazy loading for better performance loading: 'lazy', // Add decoding hint for better performance decoding: 'async', // Add fetchpriority for critical images (first image gets high priority) fetchpriority: newNodes.length === 0 ? 'high' : 'auto', class: [...(imgNode.properties.class || []), 'img-placeholder'] }
if (!alt || alt.includes('_')) { newNodes.push(imgNode) continue }
const figure = { type: 'element', tagName: 'figure', properties: { className: ['image-caption-wrapper'] }, children: [ imgNode, { type: 'element', tagName: 'figcaption', properties: { className: ['img-caption'] }, children: [ { type: 'text', value: alt } ] } ] }
newNodes.push(figure) }
if (newNodes.length > 0) { parent.children.splice(index, 1, ...newNodes) return index + newNodes.length - 1 } }) }}