Updated release.py to clean empty CHANGELOG sections

Author: michalChrobot

Tools/scripts/release.py

@@ -1,45 +1,61 @@
 """
-NGO release script
-- Update changelogs + validation exception file based on manifest version
+This python script makes the NGO package release ready. What it does is:
+1) Update changelogs
+2) Update validation exception file based on manifest version
+
+Note that this script NEEDS TO BE RUN FROM THE ROOT of the project.
 """
 #!/usr/bin/env python3
 import datetime
 import json
 import os
 import re
+import subprocess
+import platform
 
 package_name = 'com.unity.netcode.gameobjects'
 
 def update_changelog(new_version):
+    """
+    Cleans the [Unreleased] section of the changelog by removing empty subsections,
+    then replaces the '[Unreleased]' tag with the new version and release date.
+    """
+
     changelog_entry = f'## [{new_version}] - {datetime.date.today().isoformat()}'
     changelog_path = f'{package_name}/CHANGELOG.md'
-    print(changelog_entry)
-    
-    if not os.path.exists(changelog_path):
-        print(f"Error: CHANGELOG.md file not found at {changelog_path}")
-        return
+    print("Latest CHANGELOG entry will be modified to: " + changelog_entry)
 
-    with open(changelog_path, 'rb') as f:
+    with open(changelog_path, 'r', encoding='UTF-8') as f:
         changelog_text = f.read()
-    
-    changelog_text_decoded = changelog_text.decode("utf-8")
-    if '## [Unreleased]' in changelog_text_decoded:
-        # Replace the `Unreleased` section with the new version entry
-        print("Found `## [Unreleased]` section. Updating it.")
-        changelog_text = re.sub(br'## \[Unreleased\]', bytes(changelog_entry, 'UTF-8'), changelog_text)
-    else:
-        # `Unreleased` section does not exist, so prepend the new entry at the top
-        print("No `## [Unreleased]` section found. Prepending the new entry.")
-        changelog_text = bytes(f"{changelog_entry}\n\n", 'UTF-8') + changelog_text
-
-    with open(changelog_path, 'wb') as f:
-        f.write(changelog_text)
+
+    # This pattern finds a line starting with '###', followed by its newline,
+    # and then two more lines that contain only whitespace.
+    # The re.MULTILINE flag allows '^' to match the start of each line.
+    pattern = re.compile(r"^###.*\n\n\n", re.MULTILINE)
+
+    # Replace every match with an empty string. The goal is to remove empty CHANGELOG subsections.
+    cleaned_content = pattern.sub('', changelog_text)
+
+    # Replace the [Unreleased] section with the new version + cleaned subsections
+    changelog_text = re.sub(r'## \[Unreleased\]', changelog_entry, cleaned_content)
+
+    # Write the changes
+    with open(changelog_path, 'w', encoding='UTF-8', newline='\n') as file:
+        file.write(changelog_text)
+
 
 def update_validation_exceptions(new_version):
+    """
+    Updates the ValidationExceptions.json file with the new package version.
+    """
+
     validation_file = f'{package_name}/ValidationExceptions.json'
+
+    # If files do not exist, exit
     if not os.path.exists(validation_file):
         return
 
+    # Update the PackageVersion in the exceptions
     with open(validation_file, 'rb') as f:
         json_text = f.read()
         data = json.loads(json_text)
@@ -53,26 +69,33 @@ def update_validation_exceptions(new_version):
                         exception['PackageVersion'] = new_version
                         updated = True
 
+    # If no exceptions were updated, we do not need to write the file
     if not updated:
         return
 
-    with open(validation_file, "w", encoding="UTF-8") as json_file:
+    with open(validation_file, 'w', encoding='UTF-8', newline='\n') as json_file:
         json.dump(data, json_file, ensure_ascii=False, indent=2)
         json_file.write("\n")  # Add newline cause Py JSON does not
         print(f"  updated `{validation_file}`")
 
 
 def get_manifest_json_version(filename):
+    """
+    Reads the package.json file and returns the version specified in it.
+    """
     with open(filename, 'rb') as f:
         json_text = f.read()
         data = json.loads(json_text)
 
     return data['version']
 
+
 if __name__ == '__main__':
-    print(f"Current working directory: {os.getcwd()}")
     manifest_path = f'{package_name}/package.json'
-    version = get_manifest_json_version(manifest_path)
-    update_validation_exceptions(version)
+    package_version = get_manifest_json_version(manifest_path)
 
-    update_changelog(version)
+    # Update the ValidationExceptions.json file
+    # with the new package version OR remove it if not a release branch
+    update_validation_exceptions(package_version)
+    # Clean the CHANGELOG and add latest entry
+    update_changelog(package_version)