feat: kaizen generate pr commit msg and description

examples/code_review/main.py

@@ -52,3 +52,5 @@
     user="kaizen/example",
 )
 print(desc_data)
+
+comit_message = pr_desc.generate_pr_commit_message(desc_data.desc)

kaizen/generator/pr_description.py

@@ -9,6 +9,7 @@
     PR_DESCRIPTION_PROMPT,
     MERGE_PR_DESCRIPTION_PROMPT,
     PR_DESCRIPTION_SYSTEM_PROMPT,
+    PR_COMMIT_MESSAGE_PROMPT,
 )
 
 
@@ -170,3 +171,14 @@ def _process_file_chunk(
         self.total_usage = self.provider.update_usage(self.total_usage, usage)
 
         return desc
+
+    def generate_pr_commit_message(
+        self,
+        desc: str,
+        user: Optional[str] = None,
+    ) -> str:
+        prompt = PR_COMMIT_MESSAGE_PROMPT.format(
+            DESC=desc,
+        )
+        resp, usage = self.provider.chat_completion_with_json(prompt, user=user)
+        return resp, usage

kaizen/llms/prompts/pr_desc_prompts.py

@@ -52,3 +52,58 @@
 Here is list of PR descriptions in json format:
 {DESCS}
 """
+
+
+PR_COMMIT_MESSAGE_PROMPT = """
+Generate a concise and informative Git commit message based on the following description of code changes.
+Follow the Conventional Commits format and these best practices:
+
+1. Start with a type prefix, followed by a colon and space (e.g., feat:, fix:, docs:)
+2. Use lowercase for the entire subject line
+3. Keep the subject line (first line) under 50 characters
+4. Summarize the main change in the subject line
+5. Leave a blank line between the subject and the body (if a body is needed)
+6. Use the body to explain the what and why of the change, not the how
+7. Wrap the body at 72 characters
+8. Use bullet points in the body for multiple changes if necessary
+9. Include relevant issue numbers (e.g., "fixes #123" or "relates to #456")
+
+Common type prefixes:
+- feat: A new feature
+- fix: A bug fix
+- docs: Documentation only changes
+- style: Changes that do not affect the meaning of the code (white-space, formatting, etc)
+- refactor: A code change that neither fixes a bug nor adds a feature
+- perf: A code change that improves performance
+- test: Adding missing tests or correcting existing tests
+- chore: Changes to the build process or auxiliary tools and libraries
+
+Examples:
+
+1. Simple change:
+{{
+    "subject": "fix: typo in README.md",
+    "body": null
+}}
+
+2. Complex change:
+{{
+    "subject": "feat: user authentication feature",
+    "body": "Implement login and logout functionality for users.\\n\\n- Create login form and handle submission\\n- Set up session management\\n- Add logout button and route\\n- Update navbar to show login status\\n\\nRelates to #42"
+}}
+
+
+Based on this description, generate a commit message following the above guidelines and examples. 
+If the changes are simple, a subject line alone may suffice. For more complex changes, include a body with additional details.
+
+Provide the output in JSON format with the following structure:
+```
+{{
+    "subject": "prefix:the commit message subject line",
+    "body": "The commit message body (if necessary, otherwise null)"
+}}
+```
+
+Code change description:
+{DESC}
+"""