quartz-research-note/quartz/plugins/transformers/description.ts

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import { PluggableList } from "unified"
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 class Description extends QuartzTransformerPlugin {
name = "Description"
opts: Options
constructor(opts?: Options) {
super()
this.opts = { ...defaultOptions, ...opts }
}
markdownPlugins(): PluggableList {
return []
}
htmlPlugins(): PluggableList {
return [
() => {
return async (tree: HTMLRoot, file) => {
const frontMatterDescription = file.data.frontmatter?.description
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const text = toString(tree)
const desc = frontMatterDescription ?? text
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const sentences = desc.replace(/\s+/g, ' ').split('.')
let finalDesc = ""
let sentenceIdx = 0
const len = this.opts.descriptionLength
while (finalDesc.length < len) {
finalDesc += sentences[sentenceIdx] + '.'
sentenceIdx++
}
file.data.description = finalDesc
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file.data.text = text
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}
}
]
}
}
declare module 'vfile' {
interface DataMap {
description: string
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text: string
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}
}