roadmap/quartz/plugins/transformers/links.ts

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import { QuartzTransformerPlugin } from "../types"
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import {
CanonicalSlug,
RelativeURL,
TransformOptions,
_stripSlashes,
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canonicalizeServer,
joinSegments,
splitAnchor,
transformLink,
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} from "../../path"
import path from "path"
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import { visit } from "unist-util-visit"
import isAbsoluteUrl from "is-absolute-url"
interface Options {
/** How to resolve Markdown paths */
markdownLinkResolution: TransformOptions["strategy"]
/** Strips folders from a link so that it looks nice */
prettyLinks: boolean
}
const defaultOptions: Options = {
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markdownLinkResolution: "absolute",
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prettyLinks: true,
}
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export const CrawlLinks: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
const opts = { ...defaultOptions, ...userOpts }
return {
name: "LinkProcessing",
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htmlPlugins(ctx) {
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return [
() => {
return (tree, file) => {
const curSlug = canonicalizeServer(file.data.slug!)
const outgoing: Set<CanonicalSlug> = new Set()
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const transformOptions: TransformOptions = {
strategy: opts.markdownLinkResolution,
allSlugs: ctx.allSlugs,
}
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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 as RelativeURL
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node.properties.className ??= []
node.properties.className.push(isAbsoluteUrl(dest) ? "external" : "internal")
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// don't process external links or intra-document anchors
if (!(isAbsoluteUrl(dest) || dest.startsWith("#"))) {
dest = node.properties.href = transformLink(curSlug, dest, transformOptions)
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const canonicalDest = path.posix.normalize(joinSegments(curSlug, dest))
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const [destCanonical, _destAnchor] = splitAnchor(canonicalDest)
outgoing.add(destCanonical as CanonicalSlug)
}
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// rewrite link internals if prettylinks is on
if (
opts.prettyLinks &&
node.children.length === 1 &&
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node.children[0].type === "text" &&
!node.children[0].value.startsWith("#")
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) {
node.children[0].value = path.basename(node.children[0].value)
}
}
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// 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)) {
let dest = node.properties.src as RelativeURL
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const ext = path.extname(node.properties.src)
dest = node.properties.src = transformLink(curSlug, dest, transformOptions)
node.properties.src = dest + ext
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}
}
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})
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file.data.links = [...outgoing]
}
},
]
},
}
}
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declare module "vfile" {
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interface DataMap {
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links: CanonicalSlug[]
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}
}