The rest of the owl

scripts/eleventy/blog.js

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+import fs from "fs";
+import * as opml from "opml";
+
+export const setupBlogCollections = eleventyConfig => {
+    eleventyConfig.addCollection("blogByYear", api => {
+        const postsByYear = {}
+        const posts = api.getFilteredByTag('blog')
+        const years = []
+        for ( const post of posts ) {
+            const year = post.date.getFullYear()
+            if ( !postsByYear[year] ) postsByYear[year] = []
+            postsByYear[year] = [post, ...postsByYear[year]]
+            if ( !years.includes(year) ) years.push(year)
+        }
+
+        return years.sort().reverse().map(year => ({
+            year,
+            posts: postsByYear[year],
+        }))
+    })
+
+    eleventyConfig.addCollection("blogByTag", api => {
+        const postsByTag = {}
+        const posts = api.getFilteredByTag('blog')
+        const tags = []
+        for ( const post of posts ) {
+            for ( const tag of post.data.blogtags || [] ) {
+                if ( !postsByTag[tag] ) postsByTag[tag] = []
+                postsByTag[tag].push(post)
+                if ( !tags.includes(tag) ) tags.push(tag)
+            }
+        }
+
+        return tags
+            .sort()
+            .map(tag => ({
+                tag,
+                posts: postsByTag[tag].reverse(),
+            }))
+    })
+
+    eleventyConfig.addCollection("opmlByCategory", async api => {
+        const xml = fs.readFileSync("./src/assets/rss_opml.xml")
+        const parsed = await new Promise((res, rej) => {
+            opml.parse(xml, (err, doc) => err ? rej(err) : res(doc))
+        })
+
+        return parsed.opml.body.subs
+    })
+}

scripts/eleventy/feed.js

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+
+export const setupFeedCollections = eleventyConfig => {
+    eleventyConfig.addCollection("feedDesc", api => {
+        const posts = api.getFilteredByTag('feed')
+        return posts
+            .sort((a, b) => {
+                return b.date < a.date ? -1 : 1
+            })
+    })
+}