[looker] Refactor script (#233)

Make the script more readable, mostly by:

- using the Product classes,
- a little bit of renaming and documentation.

src/looker.py

@@ -1,36 +1,37 @@
 import re
+import xml.dom.minidom
 from bs4 import BeautifulSoup
 from common import http
 from common import dates
 from common import endoflife
-from xml.dom.minidom import parseString
 
-"""Fetch Looker versions with their dates from the Google Cloud release notes RSS feed.
+"""Fetch Looker versions from the Google Cloud release notes RSS feed.
 """
 
-PRODUCT = "looker"
-URL = "https://cloud.google.com/feeds/looker-release-notes.xml"
 ANNOUNCEMENT_PATTERN = re.compile(r"includes\s+the\s+following\s+changes", re.IGNORECASE)
 VERSION_PATTERN = re.compile(r"Looker\s+(?P<version>\d+\.\d+)", re.IGNORECASE)
 
+product = endoflife.Product("looker")
+print(f"::group::{product.name}")
+response = http.fetch_url("https://cloud.google.com/feeds/looker-release-notes.xml")
+rss = xml.dom.minidom.parseString(response.text)
 
-print(f"::group::{PRODUCT}")
-versions = {}
-
-response = http.fetch_url(URL)
-rss = parseString(response.text)
 for item in rss.getElementsByTagName("entry"):
-    date = dates.parse_datetime(item.getElementsByTagName("updated")[0].firstChild.nodeValue).strftime("%Y-%m-%d")
     content = item.getElementsByTagName("content")[0].firstChild.nodeValue
-    soup = BeautifulSoup(content, features="html5lib")
+    content_soup = BeautifulSoup(content, features="html5lib")
 
-    announcement = soup.find(string=ANNOUNCEMENT_PATTERN)
-    if announcement:
-        m = re.search(VERSION_PATTERN, announcement.parent.get_text())
-        if m:
-            version = m.group("version")
-            versions[version] = date
-            print(f"{version}: {date}")
+    announcement_match = content_soup.find(string=ANNOUNCEMENT_PATTERN)
+    if not announcement_match:
+        continue
 
-endoflife.write_releases(PRODUCT, versions)
+    version_match = VERSION_PATTERN.search(announcement_match.parent.get_text())
+    if not version_match:
+        continue
+
+    version = version_match.group("version")
+    date_str = item.getElementsByTagName("updated")[0].firstChild.nodeValue
+    date = dates.parse_datetime(date_str)
+    product.declare_version(version, date)
+
+product.write()
 print("::endgroup::")