import matter from "gray-matter" import remarkFrontmatter from "remark-frontmatter" import { QuartzTransformerPlugin } from "../types" import yaml from "js-yaml" import toml from "toml" import { slugTag } from "../../util/path" export interface Options { delims: string | string[] language: "yaml" | "toml" oneLineTagDelim: string } const defaultOptions: Options = { delims: "---", language: "yaml", oneLineTagDelim: ",", } export const FrontMatter: QuartzTransformerPlugin | undefined> = (userOpts) => { const opts = { ...defaultOptions, ...userOpts } return { name: "FrontMatter", markdownPlugins() { const { oneLineTagDelim } = opts return [ [remarkFrontmatter, ["yaml", "toml"]], () => { return (_, file) => { const { data } = matter(file.value, { ...opts, engines: { yaml: (s) => yaml.load(s, { schema: yaml.JSON_SCHEMA }) as object, toml: (s) => toml.parse(s) as object, }, }) // tag is an alias for tags if (data.tag) { data.tags = data.tag } // coerce title to string if (data.title) { data.title = data.title.toString() } if (data.tags && !Array.isArray(data.tags)) { data.tags = data.tags .toString() .split(oneLineTagDelim) .map((tag: string) => tag.trim()) } // slug them all!! data.tags = [...new Set(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[] } } }