Change approach to parsing release RSS feed (#40)

* Change approach to parsing release RSS feed

* Fix action script path

* Add structured / informative output

* Fix line endings

actions/get-pypi-latest-versions/action.yml

@@ -8,7 +8,7 @@ inputs:
     required: true
   num_of_latest:
     description: number of latest versions
-    default: 1
+    default: '1'
 
 outputs:
   versions:
@@ -22,15 +22,26 @@ runs:
       id: getpypi
       shell: bash
       run: |-
-        URL="https://pypi.org/project/${{ inputs.package_name }}/#history"
-        curl --header 'Accept: application/vnd.pypi.simple.v1+json' ${URL} > history.log
-        all=`cat history.log | grep 'release__card' | sed 's/.*project\///g' | cut -d'/' -f2`
-        latest=${{ inputs.num_of_latest }}
-        if [[ -z "${{ inputs.num_of_latest }}" ]]; then
-            latest=1 
-        fi
-        versions=`echo "${all}" | head -${latest} | tr '\n' ';'`
-        echo "versions=${versions}" >> "$GITHUB_OUTPUT"
-        if [ -z "${versions}" ]; then
-            exit 1
+        echo "::group::get-pypi-latest-versions - preparing virtual environment"
+        VENV_NAME="venv-pypi-versions"
+        python -m venv "$VENV_NAME"
+        source "$VENV_NAME/bin/activate"
+        pip install requests rss-parser
+        echo "::endgroup::"
+
+        echo "get-pypi-latest-versions - getting latest '$NUM_VERSIONS' version(s) of '$PACKAGE_NAME'"
+        versions=$(python "$ACTION_PATH/get-versions.py" "$PACKAGE_NAME" --num_versions "$NUM_VERSIONS")
+        echo "... result: $versions"
+
+        echo "get-pypi-latest-versions - cleaning up virtual environment"
+        rm -r "$VENV_NAME"
+
+        if [ -z "$versions" ]; then
+          exit 1
         fi
+
+        echo "versions=$versions" >> $GITHUB_OUTPUT
+      env:
+        PACKAGE_NAME: ${{ inputs.package_name }}
+        NUM_VERSIONS: ${{ inputs.num_of_latest }}
+        ACTION_PATH: ${{ github.action_path }}

actions/get-pypi-latest-versions/get-versions.py

@@ -0,0 +1,48 @@
+import argparse  # noqa: INP001
+from dataclasses import dataclass
+from functools import cached_property
+
+import requests
+from rss_parser import RSSParser
+
+DEFAULT_NUM_VERSIONS = 1
+
+
+@dataclass
+class Config:
+    package_name: str
+    num_versions: int
+
+
+def parse_args() -> Config:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("package_name", type=str)
+    parser.add_argument(
+        "-n",
+        "--num_versions",
+        type=int,
+        default=DEFAULT_NUM_VERSIONS,
+        dest="num_versions",
+    )
+    args = parser.parse_args()
+    return Config(args.package_name, args.num_versions)
+
+
+class PackageVersionFeed:
+    def __init__(self, package: str) -> None:
+        self.feed_url = f"https://pypi.org/rss/project/{package}/releases.xml"
+        response = requests.get(self.feed_url, timeout=30)
+        self.feed = RSSParser.parse(response.text)
+
+    @cached_property
+    def versions(self) -> list[str]:
+        _versions: list[str] = []
+        for item in self.feed.channel.items:
+            _versions.append(str(item.title.content))
+        return _versions
+
+
+if __name__ == "__main__":
+    config = parse_args()
+    pvf = PackageVersionFeed(config.package_name)
+    print(";".join(pvf.versions[: config.num_versions]))  # noqa: T201