add atom feed

Makefile

@@ -8,7 +8,7 @@ watch:
 	make build
 	echo "Started watcher..."
 	while true; do \
-		inotifywait -qr -e modify -e create -e delete -e move --include 'src/.*$$' .; \
+		inotifywait -qr -e modify -e create -e delete -e move --include 'src/.*$$' --include 'scripts/.*$$' .; \
 		make build; \
 	done
 

flake.nix

@@ -26,6 +26,7 @@
         };
         py = pkgs.python311.withPackages (ps: with ps; [
           jinja2
+          pytz
         ]);
         shellHook = ''
           find-up () {

scripts/build.py

@@ -1,47 +1,66 @@
 #!/usr/bin/env python3
 
 from __future__ import annotations
+
 import json
 import os
 import shutil
 import subprocess
 import tempfile
+import dataclasses
+
 from datetime import datetime
 from pathlib import Path
-import dataclasses
 from typing import Any
+from xml.etree.ElementTree import Element, SubElement, ElementTree
 
 import jinja2  # type: ignore
+import pytz  # type: ignore
 
 
-def formatdate(x: str) -> str:
-    """Convert 2024/06/08 to June 8, 2024"""
-    dt = datetime.strptime(x, "%Y-%m-%d")
-    return dt.strftime("%B %-d, %Y")
+je = jinja2.Environment()
 
 
-je = jinja2.Environment()
-je.filters["formatdate"] = formatdate
+# DATA
 
 
 @dataclasses.dataclass
 class PostMeta:
     title: str
-    date: str
+    timestamp: datetime
     public: bool
 
     @classmethod
     def parse(cls, d: dict[str, Any]) -> PostMeta:
         return cls(
             title=d["title"],
-            date=d["date"],
+            timestamp=datetime.fromisoformat(d["timestamp"]),
             public=d["public"],
         )
 
 
 PostIndex = dict[str, PostMeta]
 
 
+# UTILS
+
+
+def site_updated_at() -> datetime:
+    r = subprocess.run(["git", "log", "-1", "--format=%cI"], capture_output=True, text=True)
+    text = r.stdout.strip()
+    return datetime.fromisoformat(text).astimezone(pytz.utc)
+
+
+def article_updated_at(slug: str) -> datetime:
+    p = f"src/posts/tex/{slug}.tex"
+    r = subprocess.run(["git", "log", "-1", "--format=%cI", p], capture_output=True, text=True)
+    text = r.stdout.strip()
+    return datetime.fromisoformat(text).astimezone(pytz.utc)
+
+
+# BUILD STEPS
+
+
 def empty_dist() -> None:
     # Removing and recreating the directory messes with the `make watch+serve` workflow. So we
     # instead empty the directory each time if it already exists.
@@ -118,6 +137,30 @@ def compile_posts(posts: PostIndex):
             fp.write(post)
 
 
+def compile_feed(posts: PostIndex):
+    # fmt: off
+    feed = Element("feed", xmlns="http://www.w3.org/2005/Atom")
+    SubElement(feed, "title").text = "sunsetglow"
+    SubElement(feed, "link", href="https://sunsetglow.net/atom.xml", rel="self", type="application/atom+xml")
+    SubElement(feed, "link", href="https://sunsetglow.net/", rel="alternate", type="text/html")
+    SubElement(feed, "updated").text = site_updated_at().isoformat()
+    SubElement(feed, "id").text = "tag:sunsetglow.net,2024:site"
+
+    for slug, meta in posts.items():
+        post = SubElement(feed, "entry")
+        SubElement(post, "id").text = f"tag:sunsetglow.net,{meta.timestamp.isoformat()}:{slug}"
+        SubElement(post, "link", type="text/html").text = f"https://sunsetglow.net/posts/{slug}.html"
+        SubElement(post, "author").text = "aaaaaaaa"
+        SubElement(post, "title").text = meta.title
+        SubElement(post, "published").text = meta.timestamp.isoformat()
+        SubElement(post, "updated").text = article_updated_at(slug).isoformat()
+    # fmt: on
+
+    tree = ElementTree(feed)
+    with open("dist/atom.xml", "wb") as fh:
+        tree.write(fh, encoding="utf-8", xml_declaration=True)
+
+
 def main():
     os.chdir(os.environ["PROJECT_ROOT"])
 
@@ -128,6 +171,7 @@ def main():
     shutil.copytree("src/assets", "dist/assets")
     compile_index(posts)
     compile_posts(posts)
+    compile_feed(posts)
 
 
 if __name__ == "__main__":

src/index.jinja

@@ -5,11 +5,12 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="stylesheet" type="text/css" href="/assets/css/global.css" />
     <link rel="stylesheet" type="text/css" href="/assets/css/index.css" />
+    <link href="https://sunsetglow.net/atom.xml" type="application/atom+xml" rel="alternate" title="Atom feed" />
     <title>sunset glow</title>
   </head>
   <body>
     <div class="flex flex-col gap-2 p-4">
-      <div>sunset glow</div>
+      <div>sunset glow <a href="/atom.xml">(feed)</a></div>
       <div class="flex flex-col gap-1">
         <div class="bold">About:</div>
         <ul>
@@ -30,7 +31,10 @@
         <div class="bold">Writing:</div>
         <ul>
         {% for slug, post in posts.items() %}
-          <li><span class="tabular-nums">{{ post.date }}</span> | <a href="/posts/{{ slug }}.html">{{ post.title }}</a></li>
+          <li>
+            <span class="tabular-nums">{{ post.timestamp.strftime("%Y-%m-%d") }}</span> 
+            | <a href="/posts/{{ slug }}.html">{{ post.title }}</a>
+          </li>
         {% endfor %}
         </ul>
       </div>

src/posts/index.json

@@ -1,7 +1,7 @@
 {
   "frontend-build-systems": {
     "title": "Exposition of Frontend Build Systems",
-    "date": "2024-06-08",
+    "timestamp": "2024-06-08T03:46:00Z",
     "public": true
   }
 }

src/posts/template.jinja

@@ -14,7 +14,7 @@
         <div class="py-16" />
         <div class="flex flex-col gap-4">
           <div class="display text-xxl medium">{{ meta.title }}</div>
-          <div class="display text-sm fg-secondary italic">{{ meta.date | formatdate }}</div>
+          <div class="display text-sm fg-secondary italic">{{ meta.timestamp.strftime("%B %-d, %Y") }}</div>
         </div>
         <div class="pb-8 w-full"></div>
         <div class="pandoc">