[discourse] Add auto method (#515)

Closes #505.

src/common/dates.py

@@ -58,6 +58,7 @@ def parse_datetime(text: str, formats: list[str] = frozenset([
     "%a %d %b %Y %H:%M:%S %z",   # Wed 01 Jan 2020 00:00:00 -0400
     "%a %b %d %H:%M:%S %Z %Y",   # Wed Jan 01 00:00:00 UTC 2020
     "%a %b %d %H:%M:%S %z %Y",   # Wed Jan 01 00:00:00 -0400 2020
+    "%b %d  %Y %I:%M %p",        # Jan 1 2020 0:00 pm
     "%Y%m%d%H%M%S",              # 20230501083234
 ]), to_utc: bool = True) -> datetime:
     """Parse a given text representing a datetime using a list of formats,

src/discourse.py

@@ -0,0 +1,30 @@
+import logging
+import re
+
+from bs4 import BeautifulSoup
+from common import dates, http
+from common.releasedata import ProductData, config_from_argv
+
+"""Fetch versions from a discourse server."""
+
+config = config_from_argv()
+with ProductData(config.product) as product_data:
+    html = BeautifulSoup(http.fetch_javascript_url(config.url))
+
+    for topic in html.select("tr.topic-list-item"):
+        title = topic.select_one("span.link-top-line").get_text(strip=True)
+        versions = config.first_match(title)
+        if not versions:
+            logging.debug("Skipping %s: does not match regex", title)
+            continue
+
+        name = config.render(versions)
+        print(topic)
+        date_str = topic.select_one("td.activity").get("title").strip()
+        date_match = re.search(r"Created:\s*([A-Za-z]+\s+\d{1,2},\s+\d{4}\s+\d{1,2}:\d{2}\s+[ap]m)", date_str)
+        if not date_match:
+            logging.debug("Skipping %s: no created date found", title)
+            continue
+
+        date = dates.parse_datetime(date_match.group(1))
+        product_data.declare_version(name, date)