Add hierarchical social metadata overrides

quartz/util/siteOg.ts

@@ -1,4 +1,5 @@
 import { QuartzPluginData } from "../plugins/vfile"
+import { mergeHierarchicalSocialMetadata, socialMetadataSlug } from "./siteSocialOverrides"
 
 export type SocialImageRef =
   | {
@@ -23,6 +24,13 @@ export type SiteSocialMetadata = {
   image?: SocialImageRef
 }
 
-export function resolveSiteSocialMetadata(_fileData: QuartzPluginData): SiteSocialMetadata {
-  return {}
+const siteSocialMetadata: SiteSocialMetadata = {}
+const siteSocialMetadataOverrides: Record<string, SiteSocialMetadata> = {}
+
+export function resolveSiteSocialMetadata(fileData: QuartzPluginData): SiteSocialMetadata {
+  return mergeHierarchicalSocialMetadata(
+    siteSocialMetadata,
+    socialMetadataSlug(fileData),
+    siteSocialMetadataOverrides,
+  )
 }

quartz/util/siteSocialOverrides.ts

@@ -0,0 +1,23 @@
+import { QuartzPluginData } from "../plugins/vfile"
+
+export function socialMetadataSlug(fileData: QuartzPluginData): string {
+  return typeof fileData.slug === "string" ? fileData.slug : "index"
+}
+
+export function findHierarchicalSocialMetadata<T>(
+  slug: string,
+  overrides: Record<string, T>,
+): T | undefined {
+  return Object.entries(overrides)
+    .filter(([prefix]) => slug === prefix || slug.startsWith(`${prefix}/`))
+    .sort(([left], [right]) => right.length - left.length)[0]?.[1]
+}
+
+export function mergeHierarchicalSocialMetadata<T extends object>(
+  baseMetadata: T,
+  slug: string,
+  overrides: Record<string, Partial<T>>,
+): T {
+  const matchingOverride = findHierarchicalSocialMetadata(slug, overrides)
+  return matchingOverride ? { ...baseMetadata, ...matchingOverride } : baseMetadata
+}