From cee2883c0889a65e2786d70eb81932f5ed017e59 Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Wed, 26 Jul 2023 04:10:37 +0000
Subject: [PATCH] nested tag support and tag index page

---
 quartz/plugins/emitters/tagPage.tsx |   52 ++++++++++++++++++++++++++++++++++------------------
 1 files changed, 34 insertions(+), 18 deletions(-)

diff --git a/quartz/plugins/emitters/tagPage.tsx b/quartz/plugins/emitters/tagPage.tsx
index 30717fa..2154851 100644
--- a/quartz/plugins/emitters/tagPage.tsx
+++ b/quartz/plugins/emitters/tagPage.tsx
@@ -5,7 +5,13 @@
 import { pageResources, renderPage } from "../../components/renderPage"
 import { ProcessedContent, defaultProcessedContent } from "../vfile"
 import { FullPageLayout } from "../../cfg"
-import { CanonicalSlug, FilePath, ServerSlug } from "../../path"
+import {
+  CanonicalSlug,
+  FilePath,
+  ServerSlug,
+  getAllSegmentPrefixes,
+  joinSegments,
+} from "../../path"
 
 export const TagPage: QuartzEmitterPlugin<FullPageLayout> = (opts) => {
   if (!opts) {
@@ -21,19 +27,34 @@
     getQuartzComponents() {
       return [Head, Header, Body, ...header, ...beforeBody, Content, ...left, ...right, Footer]
     },
-    async emit(_contentDir, cfg, content, resources, emit): Promise<FilePath[]> {
+    async emit(ctx, content, resources, emit): Promise<FilePath[]> {
       const fps: FilePath[] = []
-      const allFiles = content.map(c => c[1].data)
+      const allFiles = content.map((c) => c[1].data)
+      const cfg = ctx.cfg.configuration
 
-      const tags: Set<string> = new Set(allFiles.flatMap(data => data.frontmatter?.tags ?? []))
-      const tagDescriptions: Record<string, ProcessedContent> = Object.fromEntries([...tags].map(tag => ([
-        tag, defaultProcessedContent({ slug: `tags/${tag}` as ServerSlug, frontmatter: { title: `Tag: ${tag}`, tags: [] } })
-      ])))
+      const tags: Set<string> = new Set(
+        allFiles.flatMap((data) => data.frontmatter?.tags ?? []).flatMap(getAllSegmentPrefixes),
+      )
+      // add base tag
+      tags.add("")
+
+      const tagDescriptions: Record<string, ProcessedContent> = Object.fromEntries(
+        [...tags].map((tag) => {
+          const title = tag === "" ? "Tag Index" : `Tag: #${tag}`
+          return [
+            tag,
+            defaultProcessedContent({
+              slug: joinSegments("tags", tag, "index") as ServerSlug,
+              frontmatter: { title, tags: [] },
+            }),
+          ]
+        }),
+      )
 
       for (const [tree, file] of content) {
         const slug = file.data.slug!
         if (slug.startsWith("tags/")) {
-          const tag = slug.slice("tags/".length)
+          const tag = joinSegments(slug.slice("tags/".length), "index")
           if (tags.has(tag)) {
             tagDescriptions[tag] = [tree, file]
           }
@@ -41,7 +62,7 @@
       }
 
       for (const tag of tags) {
-        const slug = `tags/${tag}` as CanonicalSlug
+        const slug = joinSegments("tags", tag) as CanonicalSlug
         const externalResources = pageResources(slug, resources)
         const [tree, file] = tagDescriptions[tag]
         const componentData: QuartzComponentProps = {
@@ -50,17 +71,12 @@
           cfg,
           children: [],
           tree,
-          allFiles
+          allFiles,
         }
 
-        const content = renderPage(
-          slug,
-          componentData,
-          opts,
-          externalResources
-        )
+        const content = renderPage(slug, componentData, opts, externalResources)
 
-        const fp = file.data.slug + ".html" as FilePath
+        const fp = (file.data.slug + ".html") as FilePath
         await emit({
           content,
           slug: file.data.slug!,
@@ -70,6 +86,6 @@
         fps.push(fp)
       }
       return fps
-    }
+    },
   }
 }

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