add <subtitle> to atom feed

[~bandali/bndl.org] / meta_feed_atom.m4

include(meta_defs.m4)dnl
<?xml version="1.0" encoding="UTF-8"?>
<feed xml:lang="en-US" xmlns="http://www.w3.org/2005/Atom">
<title>Amin Bandali's Personal Site</title>
<subtitle>Notes and blog posts by Amin Bandali</subtitle>
<id>tag:bndl.org,2020:notes.atom</id>
<link href="https://bndl.org/notes.atom" rel="self" type="application/atom+xml"/>
<link href="https://bndl.org/notes.rss" rel="alternate" type="application/rss+xml" />
<link href="https://bndl.org" rel="alternate" type="text/html"/>
<updated>syscmd(date -Iseconds -u | tr -d \\n)</updated>
define(__feed_atom)dnl
define(`fordown',`ifelse($#,0,``$0'',`ifelse(eval($2>=$3),1,
  `pushdef(`$1',$2)$4`'popdef(`$1')$0(`$1',decr($2),$3,`$4')')')')
fordown(`__i',__latest,eval(__latest-10),`
  syscmd(sed "s/\&/\&amp;/g;s/>/\&gt;/g;s/</\&lt;/g" _get(`notes', __i).m4 | m4 -D__feed_atom)')
</feed>