import { QuartzTransformerPlugin } from "../types" import { relativeToRoot, slugify, trimPathSuffix } from "../../path" import path from "path" import { visit } from 'unist-util-visit' import isAbsoluteUrl from "is-absolute-url" interface Options { /** How to resolve Markdown paths */ markdownLinkResolution: 'absolute' | 'relative' /** Strips folders from a link so that it looks nice */ prettyLinks: boolean indexAnchorLinks: boolean indexExternalLinks: boolean } const defaultOptions: Options = { markdownLinkResolution: 'absolute', prettyLinks: true, indexAnchorLinks: false, indexExternalLinks: false, } export const CrawlLinks: QuartzTransformerPlugin | undefined> = (userOpts) => { const opts = { ...defaultOptions, ...userOpts } return { name: "LinkProcessing", htmlPlugins() { return [() => { return (tree, file) => { const curSlug = file.data.slug! const transformLink = (target: string) => { const targetSlug = slugify(decodeURI(target).trim()) if (opts.markdownLinkResolution === 'relative' && !path.isAbsolute(targetSlug)) { // TODO // return './' + relative(curSlug, targetSlug) } else { return './' + relativeToRoot(curSlug, targetSlug) } } const outgoing: Set = new Set() visit(tree, 'element', (node, _index, _parent) => { // rewrite all links if ( node.tagName === 'a' && node.properties && typeof node.properties.href === 'string' ) { let dest = node.properties.href node.properties.className = isAbsoluteUrl(dest) ? "external" : "internal" // don't process external links or intra-document anchors if (!(isAbsoluteUrl(dest) || dest.startsWith("#"))) { node.properties.href = transformLink(dest) } dest = node.properties.href if (dest.startsWith(".")) { const normalizedPath = path.normalize(path.join(curSlug, dest)) outgoing.add(trimPathSuffix(normalizedPath)) } else if (dest.startsWith("#")) { if (opts.indexAnchorLinks) { outgoing.add(dest) } } else { if (opts.indexExternalLinks) { outgoing.add(dest) } } // rewrite link internals if prettylinks is on if (opts.prettyLinks && node.children.length === 1 && node.children[0].type === 'text') { node.children[0].value = path.basename(node.children[0].value) } } // transform all other resources that may use links if ( ["img", "video", "audio", "iframe"].includes(node.tagName) && node.properties && typeof node.properties.src === 'string' ) { if (!isAbsoluteUrl(node.properties.src)) { const ext = path.extname(node.properties.src) node.properties.src = transformLink(path.join("assets", node.properties.src)) + ext } } }) file.data.links = [...outgoing] } }] } } } declare module 'vfile' { interface DataMap { links: string[] } }