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// Atom (RFC 4287) feed for the blog posts, emitted as atom.xml by
// main.typ. Entries 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 3339 ("2026-07-28T00:00:00Z").
#let rfc3339(iso) = iso + "T00:00:00Z"
#let _entries(site-info, item-fn) = {
let pages = site-info.pages
let ids = pages.keys().filter(k => k.starts-with("post/"))
let entries = ()
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"
entries.push(item-fn(title, url, p))
}
entries
}
#let atom-xml(site-info) = {
let entries = _entries(site-info, (title, url, p) => {
let lines = (
" <entry>",
" <title>" + xml-escape(title) + "</title>",
" <link href=\"" + url + "\"/>",
" <id>" + url + "</id>",
)
if "date" in p {
lines.push(" <updated>" + rfc3339(p.date) + "</updated>")
}
if "description" in p {
lines.push(" <summary>" + xml-escape(p.description) + "</summary>")
}
lines.push(" </entry>")
lines.join("\n")
})
// newest post first, so its date is the feed's last-update time
let updated = rfc3339(site-info.pages.at(
site-info.pages.keys().filter(k => k.starts-with("post/")).first()
).date)
(
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>",
"<feed xmlns=\"http://www.w3.org/2005/Atom\">",
" <title>" + xml-escape(site-info.title) + "</title>",
" <link href=\"" + baseurl + "/\"/>",
" <link rel=\"self\" href=\"" + baseurl + "/atom.xml\"/>",
" <id>" + baseurl + "/</id>",
" <updated>" + updated + "</updated>",
" <author>",
" <name>Kumar</name>",
" </author>",
entries.join("\n"),
"</feed>",
"",
).join("\n")
}
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