import { PluggableList } from "unified"
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import { QuartzTransformerPlugin } from "../types"
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import { remarkWikiLink } from "@flowershow/remark-wiki-link"
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import { relative, relativeToRoot, slugify } 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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}
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const defaultOptions: Options = {
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markdownLinkResolution: 'absolute',
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prettyLinks: true
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}
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export class LinkProcessing extends QuartzTransformerPlugin {
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name = "LinkProcessing"
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opts: Options
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constructor(opts?: Options) {
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super()
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this.opts = { ...defaultOptions, ...opts }
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}
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markdownPlugins(): PluggableList {
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return [[remarkWikiLink, {
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pathFormat: this.opts.markdownLinkResolution === "absolute" ? 'obsidian-absolute' : 'raw',
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}]]
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}
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htmlPlugins(): PluggableList {
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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 (this.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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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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node.properties.className = isAbsoluteUrl(node.properties.href) ? "external" : "internal"
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// don't process external links or intra-document anchors
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if (!(isAbsoluteUrl(node.properties.href) || node.properties.href.startsWith("#"))) {
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node.properties.href = transformLink(node.properties.href)
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}
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// rewrite link internals if prettylinks is on
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if (this.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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}
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}]
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}
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}
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