From dc8eb631b691fe01828339d06c81a23f1a6c01ef Mon Sep 17 00:00:00 2001
From: Leyla Becker <git@jan-leila.com>
Date: Thu, 19 Feb 2026 19:05:21 -0600
Subject: [PATCH] feat: made tags nestable

---
 eleventy.config.js | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/eleventy.config.js b/eleventy.config.js
index a9ac6bc..07da226 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -41,6 +41,19 @@ const extractTags = (content, mdInstance) => {
   return [...new Set(tags)];
 }
 
+const expandHierarchicalTags = (tags) => {
+  const expanded = new Set();
+  tags.forEach(tag => {
+    expanded.add(tag);
+    const parts = tag.split('/');
+    for (let i = 1; i < parts.length; i++) {
+      const parentTag = parts.slice(0, i).join('/');
+      expanded.add(parentTag);
+    }
+  });
+  return [...expanded];
+};
+
 const getPostTags = (post, tagMdInstance) => {
   const filePath = post.inputPath;
   try {
@@ -275,7 +288,8 @@ module.exports = (eleventyConfig) => {
     const tagMap = {};
     
     posts.forEach(post => {
-      const tags = getPostTags(post, tagExtractorMd)
+      const rawTags = getPostTags(post, tagExtractorMd);
+      const tags = expandHierarchicalTags(rawTags);
       tags.forEach((tag) => {
         tagMap[tag] = {
           name: tag,
@@ -286,7 +300,7 @@ module.exports = (eleventyConfig) => {
     });
     
     Object.values(tagMap).forEach(tagData => {
-      tagData.posts.sort((a, b) => {
+      tagData.posts = [...new Set(tagData.posts)].sort((a, b) => {
         const aDate = a.data.createdAt || a.date;
         const bDate = b.data.createdAt || b.date;
         return aDate - bDate;
@@ -349,7 +363,9 @@ module.exports = (eleventyConfig) => {
     const postTags = posts.flatMap(post => getPostTags(post, tagExtractorMd));
     const recipeTags = recipes.flatMap(recipe => getRecipeTags(recipe));
     
-    return [...new Set([...postTags, ...recipeTags])].sort();
+    const allTags = expandHierarchicalTags([...postTags, ...recipeTags]);
+    
+    return [...new Set(allTags)].sort();
   });
 
   eleventyConfig.addCollection("contentByTag", (collectionApi) => {
@@ -363,9 +379,9 @@ module.exports = (eleventyConfig) => {
       return aDate - bDate;
     };
     
-    // Build tag map from posts
     const postTagMap = posts.reduce((acc, post) => {
-      const tags = getPostTags(post, tagExtractorMd);
+      const rawTags = getPostTags(post, tagExtractorMd);
+      const tags = expandHierarchicalTags(rawTags);
       return tags.reduce((innerAcc, tag) => ({
         ...innerAcc,
         [tag]: {
@@ -376,9 +392,9 @@ module.exports = (eleventyConfig) => {
       }), acc);
     }, {});
     
-    // Merge recipe tags into the tag map
     const tagMap = recipes.reduce((acc, recipe) => {
-      const tags = getRecipeTags(recipe);
+      const rawTags = getRecipeTags(recipe);
+      const tags = expandHierarchicalTags(rawTags);
       return tags.reduce((innerAcc, tag) => ({
         ...innerAcc,
         [tag]: {
@@ -389,12 +405,12 @@ module.exports = (eleventyConfig) => {
       }), acc);
     }, postTagMap);
     
-    // Return with sorted posts
     return Object.entries(tagMap).reduce((acc, [tag, tagData]) => ({
       ...acc,
       [tag]: {
         ...tagData,
-        posts: [...tagData.posts].sort(sortByDate),
+        posts: [...new Set(tagData.posts)].sort(sortByDate),
+        recipes: [...new Set(tagData.recipes)],
       },
     }), {});
   });