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+---
+date: '2023-09-10'
+title: 'Semi-automated hashtags for syndicated posts'
+draft: false
+tags:
+  - Eleventy
+  - development
+---
+I went out on a limb recently and decided to build a custom collection in Eleventy that aggregates my post tags and link tags (sourced from [Matter](https://getmatter.com)). These tags then get appended to shared post or link titles when they're syndicated from my site.<!-- excerpt -->
+
+The collection I built sits in my `.eleventy.js` file and looks like this:
+
+```javascript
+eleventyConfig.addCollection('tagMap', (collection) => {
+    const tags = {}
+    collection.getAll().forEach((item) => {
+      if (item.data.collections.posts) {
+        item.data.collections.posts.forEach((post) => {
+          const url = post.url.includes('http') ? post.url : `https://coryd.dev${post.url}`
+          const tagString = [...new Set(post.data.tags.map((tag) => tagAliases[tag.toLowerCase()]))]
+            .join(' ')
+            .trim()
+          if (tagString) tags[url] = tagString
+        })
+      }
+      if (item.data.links) {
+        item.data.links.forEach((link) => {
+          const tagString = [...new Set(link.tags.map((tag) => tagAliases[tag.toLowerCase()]))]
+            .join(' ')
+            .trim()
+          if (tagString) tags[link.url] = tagString
+        })
+      }
+    })
+    return tags
+  })
+```
+
+This works by iterating through the posts and global link data available from `collections.getAll()` and then mapping each tag string to the associated url in a `tags` object. The `tags` object is returned and made available as `tagMap`.
+
+Once the `tagMap` is available it's leveraged in a template that renders JSON feeds for my site — if `tagMap` is passed into the [LiquidJS](https://liquidjs.com/) render tag for the feed it's leveraged to help populate the title.
+
+**The template:**
+
+{% raw %}
+
+```liquid
+{%- assign entries = data | normalizeEntries -%}
+{
+  "version": "https://jsonfeed.org/version/1",
+  "title": "{{ title }}",
+  "icon": "https://coryd.dev/static/images/avatar.webp",
+  "home_page_url": "{{ site.url }}",
+  "feed_url": "{{ site.url }}{{ permalink }}",
+  "items": [{% for entry in entries limit: 20 -%}
+    {
+    "id": "{{ entry.url | btoa }}",
+    "title": "{{ entry.title | escape }}",
+    "url": "{{ entry.url }}",
+    "content_text": "{{ entry.title | escape }}{% if tagMap %} {{ entry.url | tagLookup: tagMap }}{% endif %} {{ entry.url }}",
+    "date_published": "{{ entry.date | stringToDate | dateToRfc822 }}"
+    }{% if not forloop.last %},{% endif %}
+  {%- endfor %}
+  ]
+}
+```
+
+{% endraw %}
+
+**Leveraging the template:**
+
+{% raw %}
+
+```liquid
+{% render "partials/feeds/json.liquid"
+  permalink:'/feeds/follow'
+  title:'Follow • Cory Dransfeldt'
+  data:follow.posts
+  updated:follow.posts[0].date_published
+  site:site
+  tagMap:collections.tagMap
+%}
+```
+
+{% endraw %}
+
+**The exceedingly simple `tagLookup` filter:**
+
+```javascript
+tagLookup: (url, tagMap) => tagMap[url],
+```
+
+The static part of this whole setup is the `tagAliases` object referenced in my custom collection, which is a curated JSON object that maps tags I typically use between my blog and Matter to formatted hashtags to share and, as of writing, looks like this:
+
+```json
+{
+  "11ty": "#Eleventy",
+  "accessibility": "#Accessibility",
+  "development": "#WebDev",
+  "eleventy": "#Eleventy",
+  "email": "#Email",
+  "fastmail": "#Email",
+  "gmail": "#Email",
+  "javascript": "#JavaScript",
+  "last.fm": "#Music",
+  "lastfm": "#Music",
+  "music": "#Music",
+  "react": "#JavaScript",
+  "social media": "#Tech",
+  "spotify": "#Music",
+  "tech": "#Tech",
+  "technology": "#Tech"
+}
+```
+
+So, with all of this in place, when my site builds it generates the `tagMap` collection, which is passed into my `json.liquid` feed template, that then looks up the matching tags via `tagLookup` before being syndicated using a GitHub action. The result is the same syndication that was in place before, but with a few additional tags to help with discovery.