feat: add methods to fetch post categories

config/collections/index.js

@@ -0,0 +1,32 @@
+const path = require("path");
+const { dir } = require("../constants.js");
+
+const getAllPosts = (collection) => {
+  const posts = collection.getFilteredByGlob(
+    path.join(dir.input, "content/posts/**/*.md"),
+  );
+  return posts.reverse();
+};
+
+const getAllPostCategories = (collection) => {
+  const posts = getAllPosts(collection);
+
+  const allCategories = posts.flatMap((post) => post.data.categories);
+
+  const categories = allCategories.reduce((acc, category) => {
+    if (acc[category]) {
+      acc[category]++;
+    } else {
+      acc[category] = 1;
+    }
+
+    return acc;
+  }, {});
+
+  return categories;
+};
+
+module.exports = {
+  getAllPosts,
+  getAllPostCategories,
+};

eleventy.config.js

@@ -14,11 +14,15 @@ const imageShortcode = require("./config/shortcodes/image.js");
 
 module.exports = (eleventyConfig) => {
   eleventyConfig.addWatchTarget("./src/assets");
+
   // 	--------------------- Custom Template Languages ---------------------
   eleventyConfig.addPlugin(
     require("./config/template-languages/css-config.js"),
   );
 
+  eleventyConfig.addCollection("posts", getAllPosts);
+  eleventyConfig.addCollection("categories", getAllPostCategories);
+
   // 	--------------------- Custom Filters -----------------------
   eleventyConfig.addFilter("entries", entries);
   eleventyConfig.addFilter("formatDate", formatDate);