plugin integration round 2

quartz/plugins/transformers/frontmatter.ts

@@ -0,0 +1,55 @@
+import { PluggableList } from "unified"
+import matter from "gray-matter"
+import remarkFrontmatter from 'remark-frontmatter'
+import { QuartzTransformerPlugin } from "../types"
+
+export interface Options {
+  language: 'yaml' | 'toml',
+  delims: string | string[]
+}
+
+const defaultOptions: Options = {
+  language: 'yaml',
+  delims: '---'
+}
+
+export class FrontMatter extends QuartzTransformerPlugin {
+  name = "FrontMatter"
+  opts: Options
+
+  constructor(opts?: Options) {
+    super()
+    this.opts = { ...defaultOptions, ...opts }
+  }
+
+  markdownPlugins(): PluggableList {
+    return [
+      remarkFrontmatter,
+      () => {
+        return (_, file) => {
+          const { data } = matter(file.value, this.opts)
+
+          // fill in frontmatter
+          file.data.frontmatter = {
+            title: file.stem ?? "Untitled",
+            tags: [],
+            ...data
+          }
+        }
+      }
+    ]
+  }
+
+  htmlPlugins(): PluggableList {
+    return []
+  }
+}
+
+declare module 'vfile' {
+  interface DataMap {
+    frontmatter: { [key: string]: any } & {
+      title: string
+      tags: string[]
+    }
+  }
+}