chore(web/atom-feed): Move feed generator out of //users/tazjin r/2973

I intend to use this for updates on TVL projects, which will end up on
the homepage, which is outside of //users.

Change-Id: I03542d1bcef3d9fc4599294655caab5ed22ba5d9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3728
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

2 files changed, 2 insertions, 146 deletions

diff --git a/users/tazjin/atom-feed/default.nix b/users/tazjin/atom-feed/default.nix
deleted file mode 100644
index 9ed2c6189237..000000000000
--- a/users/tazjin/atom-feed/default.nix
+++ /dev/null
@@ -1,145 +0,0 @@
-# This file defines functions for generating an Atom feed.
-
-{ depot, lib, pkgs, ... }:
-
-with depot.nix.yants;
-
-let
-  inherit (builtins) map readFile replaceStrings;
-  inherit (lib) concatStrings concatStringsSep removeSuffix;
-  inherit (pkgs) runCommandNoCC;
-
-  # 'link' describes a related link to a feed, or feed element.
-  #
-  # https://validator.w3.org/feed/docs/atom.html#link
-  link = struct "link" {
-    rel = string;
-    href = string;
-  };
-
-  # 'entry' describes a feed entry, for example a single post on a
-  # blog. Some optional fields have been omitted.
-  #
-  # https://validator.w3.org/feed/docs/atom.html#requiredEntryElements
-  entry = struct "entry" {
-    # Identifies the entry using a universally unique and permanent URI.
-    id = string;
-
-    # Contains a human readable title for the entry. This value should
-    # not be blank.
-    title = string;
-
-    # Content of the entry.
-    content = option string;
-
-    # Indicates the last time the entry was modified in a significant
-    # way (in seconds since epoch).
-    updated = int;
-
-    # Names authors of the entry. Recommended element.
-    authors = option (list string);
-
-    # Related web pages, such as the web location of a blog post.
-    links = option (list link);
-
-    # Conveys a short summary, abstract, or excerpt of the entry.
-    summary = option string;
-
-    # Contains the time of the initial creation or first availability
-    # of the entry.
-    published = option int;
-
-    # Conveys information about rights, e.g. copyrights, held in and
-    # over the entry.
-    rights = option string;
-  };
-
-  # 'feed' describes the metadata of the Atom feed itself.
-  #
-  # Some optional fields have been omitted.
-  #
-  # https://validator.w3.org/feed/docs/atom.html#requiredFeedElements
-  feed = struct "feed" {
-    # Identifies the feed using a universally unique and permanent URI.
-    id = string;
-
-    # Contains a human readable title for the feed.
-    title = string;
-
-    # Indicates the last time the feed was modified in a significant
-    # way (in seconds since epoch). Recommended element.
-    updated = int;
-
-    # Entries contained within the feed.
-    entries = list entry;
-
-    # Names authors of the feed. Recommended element.
-    authors = option (list string);
-
-    # Related web locations. Recommended element.
-    links = option (list link);
-
-    # Conveys information about rights, e.g. copyrights, held in and
-    # over the feed.
-    rights = option string;
-
-    # Contains a human-readable description or subtitle for the feed.
-    subtitle = option string;
-  };
-
-  # Feed generation functions:
-
-  renderEpoch = epoch: removeSuffix "\n" (readFile (runCommandNoCC "date-${toString epoch}" {} ''
-    date --date='@${toString epoch}' --utc --iso-8601='seconds' > $out
-  ''));
-
-  escape = replaceStrings [ "<" ">" "&" "'" ] [ "&lt;" "&gt;" "&amp;" "&#39;" ];
-
-  elem = name: content: ''<${name}>${escape content}</${name}>'';
-
-  renderLink = defun [ link string ] (l: ''
-    <link href="${escape l.href}" rel="${escape l.rel}" />
-  '');
-
-  # Technically the author element can also contain 'uri' and 'email'
-  # fields, but they are not used for the purpose of this feed and are
-  # omitted.
-  renderAuthor = author: ''<author><name>${escape author}</name></author>'';
-
-  renderEntry = defun [ entry string ] (e: ''
-    <entry>
-      ${elem "title" e.title}
-      ${elem "id" e.id}
-      ${elem "updated" (renderEpoch e.updated)}
-      ${if e ? published
-        then elem "published" (renderEpoch e.published)
-        else ""
-      }
-      ${if e ? content
-        then ''<content type="html">${escape e.content}</content>''
-        else ""
-      }
-      ${if e ? summary then elem "summary" e.summary else ""}
-      ${concatStrings (map renderAuthor (e.authors or []))}
-      ${if e ? subtitle then elem "subtitle" e.subtitle else ""}
-      ${if e ? rights then elem "rights" e.rights else ""}
-      ${concatStrings (map renderLink (e.links or []))}
-    </entry>
-  '');
-
-  renderFeed = defun [ feed string ] (f: ''
-    <?xml version="1.0" encoding="utf-8"?>
-    <feed xmlns="http://www.w3.org/2005/Atom">
-      ${elem "id" f.id}
-      ${elem "title" f.title}
-      ${elem "updated" (renderEpoch f.updated)}
-      ${concatStringsSep "\n" (map renderAuthor (f.authors or []))}
-      ${if f ? subtitle then elem "subtitle" f.subtitle else ""}
-      ${if f ? rights then elem "rights" f.rights else ""}
-      ${concatStrings (map renderLink (f.links or []))}
-      ${concatStrings (map renderEntry f.entries)}
-    </feed>
-  '');
-in {
-  inherit entry feed renderFeed renderEpoch;
-}
diff --git a/users/tazjin/homepage/feed.nix b/users/tazjin/homepage/feed.nix
index 40650f678ba1..bd5b3c25f4be 100644
--- a/users/tazjin/homepage/feed.nix
+++ b/users/tazjin/homepage/feed.nix
@@ -7,7 +7,8 @@ let
   inherit (builtins) map readFile sort foldl';
   inherit (lib) max singleton;
   inherit (pkgs) writeText;
-  inherit (depot.users.tazjin) atom-feed blog renderMarkdown;
+  inherit (depot.web) atom-feed;
+  inherit (depot.users.tazjin) blog renderMarkdown;
 
   postToEntry = defun [ blog.post atom-feed.entry ] (post: rec {
     id = "https://tazj.in/blog/${post.key}";