[freebsd-releases] Add auto method (#498)

Closes #401.

src/freebsd-releases.py

@@ -0,0 +1,28 @@
+import logging
+import re
+
+from common import dates, http
+from common.releasedata import ProductData, config_from_argv
+
+"""Fetches releases from https://www.freebsd.org."""
+
+VERSION_AND_DATE_PATTERN = re.compile(r"^(Release )?(?P<release>\d+\.\d+)\s*\((?P<date>\w+ \d+, \d+)\)")
+
+config = config_from_argv()
+with ProductData(config.product) as product_data:
+    html = http.fetch_html(config.url)
+
+    for li in html.select("li"):
+        text = li.get_text(strip=True)
+
+        match = VERSION_AND_DATE_PATTERN.search(text)
+        if not match:
+            logging.debug(f"Skipping {text}, does not match pattern")
+            continue
+
+        logging.debug(f"Processing {text}")
+        release_name = match.group("release")
+        release = product_data.get_release(release_name)
+
+        release_date = dates.parse_date(match.group("date"))
+        release.set_release_date(release_date)