Try to fix issue with reading changelog for specific version

Author: Martin Møldrup

.github/workflows/release.yaml

@@ -72,20 +72,17 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Read Changelog
-        id: changelog
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.12"
+
+      - name: Get changelog and add to variable
         run: |
-          if [ ! -f "CHANGELOG.md" ]; then
-            echo "CHANGELOG.md file not found."
-            exit 1
-          fi
-          CHANGELOG=$(awk '/^## \['${{ needs.details.outputs.new_version }}'\]/,/^## \[/' CHANGELOG.md | sed '1d;$d')
-          if [ -z "$CHANGELOG" ]; then
-            echo "Changelog for version ${{ needs.details.outputs.new_version }} not found."
-            exit 1
-          fi
-          echo "Changelog read as: $CHANGELOG"
-          echo "CHANGELOG=$CHANGELOG" >> $GITHUB_ENV
+          python scripts/read_changelog.py ${{ needs.details.outputs.new_version }} > specific_changelog.md
+          echo "Changelog for ${{ needs.details.outputs.new_version }}:"
+          cat specific_changelog.md
+          echo "CHANGELOG=$(cat specific_changelog.md)" >> $GITHUB_ENV
                 
   setup_and_build:
     needs: [details, check_pypi]

scripts/get_changelog.py

@@ -0,0 +1,33 @@
+"""Python script for getting the change log entry from the CHANGELOG.md file."""
+import re
+import pathlib
+import argparse
+
+parser = argparse.ArgumentParser(description="Get the change log entry for a version.")
+parser.add_argument("version", help="The version to get the change log entry for.")
+args = parser.parse_args()
+
+version = args.version
+if not version:
+    raise ValueError("No version provided.")
+
+path = pathlib.Path(__file__).parent.parent.parent / "CHANGELOG.md"
+with path.open("r", encoding="utf-8") as file:
+    lines = file.readlines()
+
+version_str = f"## [{version}]"
+version_str_next = f"## ["
+change_log = []
+found = False
+for line in lines:
+    if found:
+        if line.startswith(version_str_next):
+            break
+        change_log.append(line)
+    if line.startswith(version_str):
+        found = True
+
+if not change_log:
+    raise ValueError(f"Version {version} not found in change log.")
+
+print("".join(change_log))