Add Sparkle parser for darwin GUI app updates

nix_update/version/__init__.py

@@ -22,6 +22,7 @@
 from .rubygems import fetch_rubygem_versions
 from .savannah import fetch_savannah_versions
 from .sourcehut import fetch_sourcehut_snapshots, fetch_sourcehut_versions
+from .sparkle import fetch_sparkle_versions
 from .version import Version, VersionPreference
 
 
@@ -71,6 +72,7 @@ def __call__(
     fetch_rubygem_versions,
     fetch_savannah_versions,
     fetch_sourcehut_versions,
+    fetch_sparkle_versions,
     fetch_bitbucket_versions,
     # all entries below perform requests to check if the target url is of that type
     fetch_gitea_versions,

nix_update/version/sparkle.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+import xml.etree.ElementTree as ET
+from typing import TYPE_CHECKING
+
+from nix_update.utils import info
+
+from .http import DEFAULT_TIMEOUT, urlopen
+
+if TYPE_CHECKING:
+    from urllib.parse import ParseResult
+
+    from .version import Version
+
+
+def fetch_sparkle_versions(url: ParseResult) -> list[Version]:
+    # https://fork.dev/update/feed-stable.xml
+    # if the URL isn't an xml document, it can't be sparkle
+    if not url.path.endswith(".xml"):
+        return []
+
+    with urlopen(url.geturl(), timeout=DEFAULT_TIMEOUT) as resp:
+        xml = resp.read()
+        info(f"xml: {xml}")
+    tree = ET.fromstring(xml)
+
+    # tree.findall("enclosure").sort(key=lambda enc: enc.attrib["sparkle:version"])
+    versions = tree.findall(".//channel/item/enclosure")
+    info(versions)
+    # for enclosure in tree.findall("enclosure"):
+
+    return [versions[0].attrib["sparkle:version"]]