import matter from "gray-matter"
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import remarkFrontmatter from "remark-frontmatter"
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import { QuartzTransformerPlugin } from "../types"
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import yaml from "js-yaml"
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import toml from "toml"
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import { slugTag } from "../../util/path"
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import { QuartzPluginData } from "../vfile"
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import chalk from "chalk"
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export interface Options {
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delims: string | string[]
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language: "yaml" | "toml"
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}
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const defaultOptions: Options = {
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delims: "---",
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language: "yaml",
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}
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function coerceDate(fp: string, d: unknown): Date | undefined {
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if (d === undefined || d === null) return undefined
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const dt = new Date(d as string | number)
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const invalidDate = isNaN(dt.getTime()) || dt.getTime() === 0
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if (invalidDate) {
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console.log(
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chalk.yellow(
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`\nWarning: found invalid date "${d}" in \`${fp}\`. Supported formats: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#date_time_string_format`,
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),
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)
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return undefined
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}
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return dt
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}
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function coalesceAliases(data: { [key: string]: any }, aliases: string[]) {
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for (const alias of aliases) {
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if (data[alias] !== undefined && data[alias] !== null) return data[alias]
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}
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}
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function coerceToArray(input: string | string[]): string[] | undefined {
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if (input === undefined || input === null) return undefined
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// coerce to array
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if (!Array.isArray(input)) {
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input = input
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.toString()
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.split(",")
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.map((tag: string) => tag.trim())
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}
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// remove all non-strings
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return input
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.filter((tag: unknown) => typeof tag === "string" || typeof tag === "number")
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.map((tag: string | number) => tag.toString())
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}
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export const FrontMatter: QuartzTransformerPlugin<Partial<Options> | undefined> = (userOpts) => {
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const opts = { ...defaultOptions, ...userOpts }
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return {
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name: "FrontMatter",
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markdownPlugins() {
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return [
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[remarkFrontmatter, ["yaml", "toml"]],
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() => {
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return (_, file) => {
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const fp = file.data.filePath!
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const { data } = matter(Buffer.from(file.value), {
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...opts,
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engines: {
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yaml: (s) => yaml.load(s, { schema: yaml.JSON_SCHEMA }) as object,
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toml: (s) => toml.parse(s) as object,
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},
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})
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if (data.title) {
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data.title = data.title.toString()
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} else if (data.title === null || data.title === undefined) {
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data.title = file.stem ?? "Untitled"
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}
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const tags = coerceToArray(coalesceAliases(data, ["tags", "tag"]))
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if (tags) data.tags = [...new Set(tags.map((tag: string) => slugTag(tag)))]
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const aliases = coerceToArray(coalesceAliases(data, ["aliases", "alias"]))
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if (aliases) data.aliases = aliases
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const cssclasses = coerceToArray(coalesceAliases(data, ["cssclasses", "cssclass"]))
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if (cssclasses) data.cssclasses = cssclasses
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const created = coerceDate(fp, coalesceAliases(data, ["created", "date"]))
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if (created) data.created = created
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const modified = coerceDate(
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fp,
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coalesceAliases(data, ["modified", "lastmod", "updated", "last-modified"]),
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)
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if (modified) data.modified = modified
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const published = coerceDate(fp, coalesceAliases(data, ["published", "publishDate"]))
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if (published) data.published = published
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// fill in frontmatter
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file.data.frontmatter = data as QuartzPluginData["frontmatter"]
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}
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},
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]
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},
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}
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}
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declare module "vfile" {
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interface DataMap {
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frontmatter: { [key: string]: unknown } & {
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title: string
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} & Partial<{
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tags: string[]
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aliases: string[]
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description: string
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publish: boolean
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draft: boolean
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enableToc: string
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cssclasses: string[]
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created: Date
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modified: Date
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published: Date
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}>
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}
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}
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