roadmap/quartz/plugins/transformers/frontmatter.ts

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import matter from "gray-matter"
import remarkFrontmatter from 'remark-frontmatter'
import { QuartzTransformerPlugin } from "../types"
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import yaml from 'js-yaml'
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import { slug as slugAnchor } from 'github-slugger'
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export interface Options {
language: 'yaml' | 'toml',
delims: string | string[]
}
const defaultOptions: Options = {
language: 'yaml',
delims: '---'
}
export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
const opts = { ...defaultOptions, ...userOpts }
return {
name: "FrontMatter",
markdownPlugins() {
return [
remarkFrontmatter,
() => {
return (_, file) => {
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const { data } = matter(file.value, {
...opts,
engines: {
yaml: s => yaml.load(s, { schema: yaml.JSON_SCHEMA }) as object
}
})
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// tag is an alias for tags
if (data.tag) {
data.tags = data.tag
}
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if (data.tags && !Array.isArray(data.tags)) {
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data.tags = data.tags.toString().split(",").map((tag: string) => tag.trim())
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}
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// slug them all!!
data.tags = data.tags?.map((tag: string) => slugAnchor(tag)) ?? []
// fill in frontmatter
file.data.frontmatter = {
title: file.stem ?? "Untitled",
tags: [],
...data
}
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}
}
]
},
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}
}
declare module 'vfile' {
interface DataMap {
frontmatter: { [key: string]: any } & {
title: string
tags: string[]
}
}
}