tvl-depot/web/blog/default.nix

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# This creates the static files that make up my blog from the Markdown
# files in this repository.
#
# All blog posts are rendered from Markdown by cheddar.
{ depot, lib, pkgs, ... }@args:
with depot.nix.yants;
let
inherit (builtins) readFile;
inherit (depot.nix) renderMarkdown;
inherit (depot.web) atom-feed;
inherit (lib) singleton;
# Type definition for a single blog post.
post = struct "blog-post" {
key = string;
title = string;
date = int;
# Optional time at which this post was last updated.
updated = option int;
# Path to the Markdown file containing the post content.
content = path;
# Should this post be included in the index? (defaults to true)
listed = option bool;
# Is this a draft? (adds a banner indicating that the link should
# not be shared)
draft = option bool;
# Previously each post title had a numeric ID. For these numeric
# IDs, redirects are generated so that old URLs stay compatible.
oldKey = option string;
};
# Rendering fragments for the HTML version of the blog.
fragments = import ./fragments.nix args;
# Functions for generating feeds for these blogs using //web/atom-feed.
toFeedEntry = { baseUrl, ...}: defun [ post atom-feed.entry ] (post: rec {
id = "${baseUrl}/${post.key}";
title = post.title;
content = readFile (renderMarkdown post.content);
published = post.date;
updated = post.updated or post.date;
links = singleton {
rel = "alternate";
href = id;
};
});
in {
inherit post toFeedEntry;
inherit (fragments) renderPost;
# Helper function to determine whether a post should be included in
# listings (on homepages, feeds, ...)
includePost = post: !(fragments.isDraft post) && !(fragments.isUnlisted post);
}