Add RSS feed functionality

Makefile

@@ -14,7 +14,10 @@ watch:
 serve:
 	python -m http.server --directory out/
 
-publish:
+pubdate:
+	sed -i "s/pubdate: now/pubdate: $$(date -Isec)/" src/blog/*.md
+
+upload:
 	./build.py srv/
 	pagefind --site srv/
 	rsync -av srv/* ssh.alogoulogoi.com:/srv/www.alogoulogoi.com

build.py

@@ -1,12 +1,14 @@
 #!/usr/bin/env python
 
 import argparse
+from datetime import datetime, timezone
 import copy
 import os
 import pathlib
 import shutil
 
 import bs4
+from feedgen.feed import FeedGenerator
 import markdown
 
 
@@ -21,6 +23,10 @@ def main():
     md = markdown.Markdown(extensions=["attr_list", "footnotes", "md_in_html", "meta"])
     comment_md = markdown.Markdown()
 
+    # Map of feed url -> FeedGenerator object
+    feeds = {}
+    build_date = datetime.now(timezone.utc)
+
     # Load the template
     template = bs4.BeautifulSoup(
         (src / ".template.html").read_text(encoding="utf8"),
@@ -107,10 +113,41 @@ def main():
                         aside.extend(html.p.contents)
                         page.header.append(aside)
 
+                # RSS metadata
+                if "feed" in meta and "pubdate" in meta:
+                    pubdate = datetime.fromisoformat(meta["pubdate"][0])
+                    link = f"https://www.alogoulogoi.com/{dest.relative_to(out).as_posix()}"
+                    for feed in meta["feed"]:
+                        if feed not in feeds:
+                            feeds[feed] = []
+                        feeds[feed].append({
+                            "title": meta_title[0],
+                            "link": link,
+                            "description": "",
+                            "pubdate": pubdate,
+                        })
+
                 # Write the fully templated page
                 print("Writing   ", dest)
                 dest.write_text(str(page))
 
+    for feed, items in feeds.items():
+        fg = FeedGenerator()
+        fg.title(f"alogoulogoi /{feed}/")
+        fg.link(href=f"https://www.alogoulogoi.com/{feed}/feed.xml")
+        fg.description("Blog posts from alogoulogoi")
+        fg.language("en-us")
+        fg.lastBuildDate(build_date)
+        for item in sorted(items, key=lambda i: i["pubdate"]):
+            entry = fg.add_entry()
+            entry.title(item["title"])
+            entry.link(href=item["link"])
+            entry.description(item["description"])
+            entry.published(item["pubdate"])
+        rss_path = (out / feed / "feed.xml")
+        os.makedirs(rss_path.parent, exist_ok=True)
+        rss_path.write_bytes(fg.rss_str(pretty=True))
+
     print("Processed", count, "files")