quartz-research-note/quartz/plugins/transformers/frontmatter.ts
2023-08-11 00:31:44 -07:00

67 lines
1.6 KiB
TypeScript

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