add links from properties after the article title

quartz/plugins/transformers/ofm.ts

@@ -20,6 +20,9 @@ import { toHtml } from "hast-util-to-html"
 import { PhrasingContent } from "mdast-util-find-and-replace/lib"
 import { capitalize } from "../../util/lang"
 import { PluggableList } from "unified"
+import yaml from "js-yaml"
+import toml from "toml"
+import matter from "gray-matter"
 
 export interface Options {
   comments: boolean
@@ -34,6 +37,9 @@ export interface Options {
   enableYouTubeEmbed: boolean
   enableVideoEmbed: boolean
   enableCheckbox: boolean
+  parsePropertiesWikilinks: boolean
+  delims: string
+  language: "yaml" | "toml"
 }
 
 const defaultOptions: Options = {
@@ -49,6 +55,9 @@ const defaultOptions: Options = {
   enableYouTubeEmbed: true,
   enableVideoEmbed: true,
   enableCheckbox: false,
+  parsePropertiesWikilinks: true,
+  delims: "---",
+  language: "yaml",
 }
 
 const calloutMapping = {
@@ -98,6 +107,27 @@ function canonicalizeCallout(calloutName: string): keyof typeof calloutMapping {
   return calloutMapping[normalizedCallout] ?? calloutName
 }
 
+function propertyLinksToRegularMarkdown(obj: { [key: string]: any }): string {
+  // Parses wikilinks from FrontMatter properties and returns a string with all.
+  let result = ""
+
+  for (const key in obj) {
+    if (Object.prototype.hasOwnProperty.call(obj, key)) {
+      if (
+        Array.isArray(obj[key]) &&
+        typeof obj[key][0] === "string" &&
+        obj[key][0].includes("[[")
+      ) {
+        result += `- ${key}: ${obj[key].join(", ")}\n`
+      } else if (typeof obj[key] === "string" && obj[key].includes("[[")) {
+        result += `- ${key}: ${obj[key]}\n`
+      }
+    }
+  }
+
+  return result
+}
+
 export const externalLinkRegex = /^https?:\/\//i
 
 export const arrowRegex = new RegExp(/(-{1,2}>|={1,2}>|<-{1,2}|<={1,2})/g)
@@ -191,6 +221,39 @@ export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>>
           })
         })
 
+      // move Obsidian properties with links to the top of the file
+      if (opts.parsePropertiesWikilinks) {
+        if (src instanceof Buffer) {
+          src = src.toString()
+        }
+
+        const { data } = matter(Buffer.from(src), {
+          ...opts,
+          engines: {
+            yaml: (s) => yaml.load(s, { schema: yaml.JSON_SCHEMA }) as object,
+            toml: (s) => toml.parse(s) as object,
+          },
+        })
+        const prop_links = propertyLinksToRegularMarkdown(data)
+        if (prop_links !== "") {
+          const yaml_props = src.split(opts.delims)[1]
+          const content = src.split(opts.delims).slice(2).join(opts.delims)
+
+          src =
+            opts.delims +
+            "\n" +
+            yaml_props +
+            "\n" +
+            opts.delims +
+            "\n" +
+            prop_links +
+            "\n" +
+            opts.delims +
+            "\n" +
+            content
+        }
+      }
+
         // replace all other wikilinks
         src = src.replace(wikilinkRegex, (value, ...capture) => {
           const [rawFp, rawHeader, rawAlias]: (string | undefined)[] = capture