import { Root as HTMLRoot } from 'hast' import { toString } from "hast-util-to-string" import { QuartzTransformerPlugin } from "../types" export interface Options { descriptionLength: number } const defaultOptions: Options = { descriptionLength: 150 } export const Description: QuartzTransformerPlugin | undefined> = (userOpts) => { const opts = { ...defaultOptions, ...userOpts } return { name: "Description", markdownPlugins() { return [] }, htmlPlugins() { return [ () => { return async (tree: HTMLRoot, file) => { const frontMatterDescription = file.data.frontmatter?.description const text = toString(tree) const desc = frontMatterDescription ?? text const sentences = desc.replace(/\s+/g, ' ').split('.') let finalDesc = "" let sentenceIdx = 0 const len = opts.descriptionLength while (finalDesc.length < len) { finalDesc += sentences[sentenceIdx] + '.' sentenceIdx++ } file.data.description = finalDesc file.data.text = text } } ] } } } declare module 'vfile' { interface DataMap { description: string text: string } }