feat: include commit messages in pull request description

aider_gitea/__init__.py

@@ -173,6 +173,31 @@ def create_aider_command(issue: str) -> list[str]:
     return l
 
 
+def get_commit_messages(cwd: Path, base_branch: str, current_branch: str) -> str:
+    """Get commit messages between base branch and current branch.
+
+    Args:
+        cwd: The current working directory (repository path).
+        base_branch: The name of the base branch to compare against.
+        current_branch: The name of the current branch to check for commits.
+
+    Returns:
+        A string containing all commit messages, one per line.
+    """
+    try:
+        result = subprocess.run(
+            ['git', 'log', f'{base_branch}..{current_branch}', '--pretty=format:%s'],
+            check=True,
+            cwd=cwd,
+            capture_output=True,
+            text=True,
+        )
+        return result.stdout.strip()
+    except subprocess.CalledProcessError:
+        logger.exception(f'Failed to get commit messages on branch {current_branch}')
+        return ""
+
+
 def push_changes(
     cwd: Path,
     branch_name: str,
@@ -184,6 +209,16 @@ def push_changes(
     if not has_commits_on_branch(cwd, base_branch, branch_name):
         logger.info('No commits made on branch %s, skipping push', branch_name)
         return False
+    
+    # Get commit messages for PR description
+    commit_messages = get_commit_messages(cwd, base_branch, branch_name)
+    description = f"This pull request resolves #{issue_number}\n\n"
+    
+    if commit_messages:
+        description += "## Commit Messages\n\n"
+        for message in commit_messages.split('\n'):
+            description += f"- {message}\n"
+    
     cmd = [
         'git',
         'push',
@@ -194,7 +229,7 @@ def push_changes(
         '-o',
         f'title={issue_title}',
         '-o',
-        f'description=This pull request resolves #{issue_number}',
+        f'description={description}',
     ]
     run_cmd(cmd, cwd)
     return True