From 99ccb1be599ad7e65a0f13d9048ba7e27e7e8713 Mon Sep 17 00:00:00 2001
From: Romain Vigier <romain@romainvigier.fr>
Date: Fri, 27 Aug 2021 11:39:51 +0200
Subject: [PATCH] Use custom script for getting release notes

---
 .gitlab-ci.yml                 |  5 ++-
 build-aux/get_release_notes.py | 62 ++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+), 3 deletions(-)
 create mode 100755 build-aux/get_release_notes.py

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e2653d5..b294c96 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -107,15 +107,14 @@ package:
         "${PACKAGE_REGISTRY_URL}/${CI_COMMIT_TAG}/${PACKAGE_NAME}"
 
 release-notes:
+  extends: .python
   stage: deploy
   needs:
     - reuse
-  image: rust:latest
   rules:
     - if: $CI_COMMIT_TAG
   script:
-    - cargo install parse-changelog
-    - parse-changelog --version-format="^\d+$" CHANGELOG.md $CI_COMMIT_TAG > release-notes.md
+    - ./build-aux/get_release_notes.py $CI_COMMIT_TAG > release-notes.md
   artifacts:
     paths:
       - release-notes.md
diff --git a/build-aux/get_release_notes.py b/build-aux/get_release_notes.py
new file mode 100755
index 0000000..108cd27
--- /dev/null
+++ b/build-aux/get_release_notes.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+
+# SPDX-FileCopyrightText: 2021 Romain Vigier <contact AT romainvigier.fr>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+"""Get release notes for a specific release."""
+
+
+import argparse
+import re
+
+from typing import Dict, List
+
+
+releases: Dict[str, str] = {}
+
+
+def parse_changelog(path: str):
+    """Parse a changelog file for versions and release notes.
+
+    Args:
+        path (str): Path to the changelog file.
+    """
+    release_regex = re.compile(r"^##\s")
+    version_regex = re.compile(r"([\d\.]+)")
+
+    current_version = ''
+    current_notes: List[str] = []
+
+    with open(path, "r") as f:
+        for line in f.readlines():
+            if release_regex.match(line):
+                if current_version != '':
+                    releases[current_version] = ''.join(current_notes).strip()
+                current_notes = []
+                current_version = version_regex.findall(line)[0]
+            else:
+                current_notes.append(line)
+        releases[current_version] = ''.join(current_notes).strip()
+
+
+def print_release_notes(version: str):
+    """Print the release notes of the given release.
+
+    Args:
+        version (str): The requested version.
+    """
+    print(releases[version.replace("v", "")])
+
+
+argparser = argparse.ArgumentParser()
+argparser.add_argument(
+    "-f", "--file",
+    default="CHANGELOG.md",
+    help="Path to the changelog file",
+    metavar="CHANGELOG")
+argparser.add_argument("version", help="Version to get the release notes for")
+args = argparser.parse_args()
+
+
+parse_changelog(args.file)
+print_release_notes(args.version)