From 1bf87aaa088d975e6272f3e1a9722bf722b910e5 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Wed, 2 Aug 2023 22:30:45 +0100
Subject: Tool to generate a releases atom file

---
 .gitignore    |  1 +
 tools/atom.py | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100755 tools/atom.py

diff --git a/.gitignore b/.gitignore
index 109bc76..3c46164 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@
 *~
 *.swp
 out/
+tools/releases.xml
 
diff --git a/tools/atom.py b/tools/atom.py
new file mode 100755
index 0000000..c3b3da4
--- /dev/null
+++ b/tools/atom.py
@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+
+import re
+from datetime import datetime, timezone, date
+
+release = re.compile("^## Release ([0-9]+\\.[0-9]+\\.[0-9]+) - ([0-9]+-[0-9]+-[0-9]+)$")
+
+title = "SpaceBeans releases"
+base_url = "https://www.usebox.net/jjm/spacebeans/"
+feed_file = "releases.xml"
+author = "jjm"
+tz = timezone.utc
+
+
+def get_entries(changes):
+    entries = []
+
+    with open(changes, "rt") as fd:
+        lines = fd.readlines()
+
+    i = 0
+    while i < len(lines):
+        line = lines[i]
+        m = release.match(line)
+        if m:
+            version = m.group(1)
+            updated_on = datetime.fromisoformat(m.group(2)).astimezone(tz)
+            body = ""
+            i += 1
+            while i < len(lines) and (lines[i] == "" or lines[i][0] != "#"):
+                body += lines[i]
+                i += 1
+
+            entries.append(dict(version=version, updated_on=updated_on, body=body))
+        else:
+            i += 1
+
+    entries.sort(key=lambda o: o["updated_on"], reverse=True)
+    return entries
+
+
+def to_atom(post):
+    return """\
+<entry>
+    <title>{title}</title>
+    <link rel="alternate" href="{url}"/>
+    <id>{url}</id>
+    <updated>{updated_on}</updated>
+    <content type="xhtml">
+      <div xmlns="http://www.w3.org/1999/xhtml">
+      <pre>{body}</pre>
+      </div>
+    </content>
+</entry>\n""".format(
+        title="Released SpaceBeans " + post["version"],
+        url=base_url + "#" + post["version"],
+        updated_on=datetime.combine(
+            post["updated_on"], datetime.min.time()
+        ).isoformat(),
+        body=post["body"].rstrip() + "\n",
+    )
+
+
+def gen_atom(entries):
+
+    updated_on = datetime(1900, 1, 1, tzinfo=tz)
+    posts_atom = []
+    for post in entries:
+        if post["updated_on"] > updated_on:
+            updated_on = post["updated_on"]
+
+        posts_atom.append(to_atom(post))
+
+    return "\n".join(
+        [
+            """<?xml version="1.0" encoding="utf-8"?>""",
+            """<feed xmlns="http://www.w3.org/2005/Atom">""",
+            """<title>%s</title>""" % title,
+            """<link href="%s"/>""" % base_url,
+            """<link rel="self" href="%s"/>""" % (base_url + feed_file),
+            """<updated>%s</updated>""" % updated_on.isoformat(),
+            """<id>%s</id>""" % base_url,
+            """<author>""",
+            """    <name>%s</name>""" % author,
+            """</author>""",
+        ]
+        + posts_atom
+        + ["</feed>"]
+    )
+
+
+def main():
+    entries = get_entries("../CHANGES.md")
+    with open(feed_file, "wt") as fd:
+        fd.write(gen_atom(entries))
+
+
+if __name__ == "__main__":
+    main()
-- 
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