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// RSS 2.0 feed for the blog posts, emitted as feed.xml by main.typ.
// Items are built from the metadata in site-info.pages (newest first).
#import "/global/common.typ": baseurl
#let xml-escape(s) = s.replace("&", "&").replace("<", "<").replace(">", ">")
// ISO date ("2026-07-28") to RFC 822 ("Tue, 28 Jul 2026 00:00:00 GMT").
#let rfc822(iso) = {
let (y, m, d) = iso.split("-").map(int)
datetime(year: y, month: m, day: d).display(
"[weekday repr:short], [day] [month repr:short] [year] 00:00:00 GMT"
)
}
#let feed-xml(site-info) = {
let pages = site-info.pages
let ids = pages.keys().filter(k => k.starts-with("post/"))
let items = ()
for id in ids {
let p = pages.at(id)
let title = if "long-title" in p { p.long-title } else { p.title }
let url = baseurl + "/" + id + ".html"
let lines = (
" <item>",
" <title>" + xml-escape(title) + "</title>",
" <link>" + url + "</link>",
" <guid>" + url + "</guid>",
)
if "date" in p {
lines.push(" <pubDate>" + rfc822(p.date) + "</pubDate>")
}
if "description" in p {
lines.push(" <description>" + xml-escape(p.description) + "</description>")
}
lines.push(" </item>")
items.push(lines.join("\n"))
}
(
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>",
"<rss version=\"2.0\">",
"<channel>",
" <title>" + xml-escape(site-info.title) + "</title>",
" <link>" + baseurl + "/</link>",
" <description>Posts from " + xml-escape(site-info.title) + " (" + baseurl + ")</description>",
items.join("\n"),
"</channel>",
"</rss>",
"",
).join("\n")
}
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