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