Reorganise configurations for blog post categories

eleventy.config.js

@@ -10,7 +10,7 @@ import { VentoPlugin } from 'eleventy-plugin-vento';
 import markdownItConfig from "./src/_config/markdown-it.js";
 import feedsConfig from "./src/_config/feeds.js";
 import filesConfig from "./src/_config/files.js";
-import collectionsConfig from "./src/_config/collections.js";
+import categoriesConfig from "./src/_config/categories.js";
 import filtersConfig from "./src/_config/filters.js";
 import shortCodesConfig from "./src/_config/shortcodes.js";
 
@@ -34,7 +34,7 @@ export default function(eleventyConfig) {
     eleventyConfig.addPlugin(markdownItConfig);
     eleventyConfig.addPlugin(feedsConfig);
     eleventyConfig.addPlugin(filesConfig);
-    eleventyConfig.addPlugin(collectionsConfig);
+    eleventyConfig.addPlugin(categoriesConfig);
     eleventyConfig.addPlugin(filtersConfig);
     eleventyConfig.addPlugin(shortCodesConfig);
 

src/_config/categories.js

@@ -0,0 +1,26 @@
+export default function(eleventyConfig) {
+    // Add blog post categories to collections
+    eleventyConfig.addCollection("categories", (collectionApi) => {
+        let categories = new Set();
+        let posts = collectionApi.getFilteredByTag('posts');
+        posts.forEach(p => {
+            let cats = p.data.categories;
+            if (cats) {
+                cats.forEach(c => categories.add(c));
+            }
+        });
+        return Array.from(categories).sort();
+    });
+
+    // Filter: Filter blog posts by category
+    eleventyConfig.addFilter("filterByCategory", (posts, cat) => {
+        cat = cat.toLowerCase();
+        let result = posts.filter(p => {
+            let cats = p.data.categories.map(s => s.toLowerCase());
+            if (cats) {
+                return cats.includes(cat);
+            }
+        });
+        return result;
+    });
+}

src/_config/collections.js

@@ -1,12 +0,0 @@
-export default function(eleventyConfig) {
-    // Add blog post categories to collections
-    eleventyConfig.addCollection("categories", (collectionApi) => {
-        let categories = new Set();
-        let posts = collectionApi.getFilteredByTag('posts');
-        posts.forEach(p => {
-            let cats = p.data.categories;
-            cats.forEach(c => categories.add(c));
-        });
-        return Array.from(categories).sort();
-    });
-}

src/_config/filters.js

@@ -22,14 +22,4 @@ export default function(eleventyConfig) {
     eleventyConfig.addFilter("thousands", (num) => {
         return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
     });
-
-    // Filter: Filter blog posts by category
-    eleventyConfig.addFilter("filterByCategory", (posts, cat) => {
-        cat = cat.toLowerCase();
-        let result = posts.filter(p => {
-            let cats = p.data.categories.map(s => s.toLowerCase());
-            return cats.includes(cat);
-        });
-        return result;
-    });
 }