73 lines
1.7 KiB
TypeScript
73 lines
1.7 KiB
TypeScript
|
import { PluggableList } from "unified"
|
||
|
|
import { QuartzTransformerPlugin } from "../types"
|
||
|
|
import { Root } from "mdast"
|
||
|
|
import { visit } from "unist-util-visit"
|
||
|
|
import { toString } from "mdast-util-to-string"
|
||
|
|
import { slugAnchor } from "../../path"
|
||
|
|
|
||
|
|
export interface Options {
|
||
|
|
maxDepth: 1 | 2 | 3 | 4 | 5 | 6,
|
||
|
|
minEntries: 1,
|
||
|
|
showByDefault: boolean
|
||
|
|
}
|
||
|
|
|
||
|
|
const defaultOptions: Options = {
|
||
|
|
maxDepth: 3,
|
||
|
|
minEntries: 1,
|
||
|
|
showByDefault: true,
|
||
|
|
}
|
||
|
|
|
||
|
|
interface TocEntry {
|
||
|
|
depth: number,
|
||
|
|
text: string,
|
||
|
|
slug: string
|
||
|
|
}
|
||
|
|
|
||
|
|
export class TableOfContents extends QuartzTransformerPlugin {
|
||
|
|
name = "TableOfContents"
|
||
|
|
opts: Options
|
||
|
|
|
||
|
|
constructor(opts?: Partial<Options>) {
|
||
|
|
super()
|
||
|
|
this.opts = { ...defaultOptions, ...opts }
|
||
|
|
}
|
||
|
|
|
||
|
|
markdownPlugins(): PluggableList {
|
||
|
|
return [() => {
|
||
|
|
return async (tree: Root, file) => {
|
||
|
|
const display = file.data.frontmatter?.enableToc ?? this.opts.showByDefault
|
||
|
|
if (display) {
|
||
|
|
const toc: TocEntry[] = []
|
||
|
|
let highestDepth: number = this.opts.maxDepth
|
||
|
|
visit(tree, 'heading', (node) => {
|
||
|
|
if (node.depth <= this.opts.maxDepth) {
|
||
|
|
const text = toString(node)
|
||
|
|
highestDepth = Math.min(highestDepth, node.depth)
|
||
|
|
toc.push({
|
||
|
|
depth: node.depth,
|
||
|
|
text,
|
||
|
|
slug: slugAnchor.slug(text)
|
||
|
|
})
|
||
|
|
}
|
||
|
|
})
|
||
|
|
|
||
|
|
if (toc.length > this.opts.minEntries) {
|
||
|
|
file.data.toc = toc.map(entry => ({ ...entry, depth: entry.depth - highestDepth }))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}]
|
||
|
|
}
|
||
|
|
|
||
|
|
htmlPlugins(): PluggableList {
|
||
|
|
return []
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
declare module 'vfile' {
|
||
|
|
interface DataMap {
|
||
|
|
toc: TocEntry[]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|