As blogger I want to be able to categorize my posts, so that my posts be organized.

[clarete]

There are a few things we need in order to get this working:

1. the code for generating the pages for each category. the snippet below will generate a directory for each category name with an index.html file within it:

   (weblorg-route
    :name "categories"
    :input-pattern "posts/*.org"
    :input-aggregate #'weblorg-input-aggregate-by-category ;; also look at weblorg-input-aggregate-by-category-desc
    :template "category.html"
    :output "blog/{{ name }}/index.html"
    :url "/blog/{{ name }}")
   ;; the template will link to the `posts` route with `url_for`.
   (weblorg-route
    :name "posts"
    :input-pattern "posts/*.org"
    :template "post.html"
    :output "blog/{{ slug }}.html"
    :url "/blog/{{ slug }}.html")

2. The category.html template present in the templates path (we don't have any themes shipping this file yet 😢)

   {% extends "layout.html" %}
   {% block body %}
     <div class="title"><h1>{{ category.name }}</h1></div>
     <div class="content">
       <ul>
         {% for post in category.posts %}
           <li>
             <span class="pubdate">{{ post.date }}</span>
             <a href="{{ url_for("posts", slug=post.slug) }}">{{ post.title }}</a>
           </li>
         {% endfor %}
       </ul>
     </div>
   {% endblock %}