s

pr_agent/tools/pr_update_changelog.py

@@ -0,0 +1,103 @@
+import copy
+import json
+import logging
+import textwrap
+from typing import Tuple
+
+from jinja2 import Environment, StrictUndefined
+
+from pr_agent.algo.ai_handler import AiHandler
+from pr_agent.algo.pr_processing import get_pr_diff, retry_with_fallback_models
+from pr_agent.algo.token_handler import TokenHandler
+from pr_agent.config_loader import settings
+from pr_agent.git_providers import get_git_provider, GithubProvider
+from pr_agent.git_providers.git_provider import get_main_pr_language
+
+
+class PRUpdateChangelog:
+    def __init__(self, pr_url: str, cli_mode=False):
+
+        self.git_provider = get_git_provider()(pr_url)
+        self.main_language = get_main_pr_language(
+            self.git_provider.get_languages(), self.git_provider.get_files()
+        )
+        max_lines=50
+        try:
+            self.changelog_file = self.git_provider.repo_obj.get_contents("CHANGELOG.md", ref=self.git_provider.get_pr_branch())
+            changelog_file_lines = self.changelog_file.decoded_content.decode().splitlines()
+            changelog_file_lines = changelog_file_lines[:max_lines]
+            self.changelog_file_str = "\n".join(changelog_file_lines)
+        except:
+            raise Exception("No CHANGELOG.md file found in the repository")
+
+        self.ai_handler = AiHandler()
+        self.patches_diff = None
+        self.prediction = None
+        self.cli_mode = cli_mode
+        self.vars = {
+            "title": self.git_provider.pr.title,
+            "branch": self.git_provider.get_pr_branch(),
+            "description": self.git_provider.get_pr_description(),
+            "language": self.main_language,
+            "diff": "",  # empty diff for initial calculation
+            "changelog_file": self.changelog_file_str,
+        }
+        self.token_handler = TokenHandler(self.git_provider.pr,
+                                          self.vars,
+                                          settings.pr_update_changelog_prompt.system,
+                                          settings.pr_update_changelog_prompt.user)
+
+    async def update_changelog(self):
+        assert type(self.git_provider) == GithubProvider, "Currently only Github is supported"
+
+        logging.info('Updating the changelog...')
+        if settings.config.publish_output:
+            self.git_provider.publish_comment("Preparing changelog updates...", is_temporary=True)
+        await retry_with_fallback_models(self._prepare_prediction)
+        logging.info('Preparing PR changelog updates...')
+        new_file_content, answer = self._prepare_changelog_update()
+        if settings.config.publish_output or True:
+            self.git_provider.remove_initial_comment()
+            logging.info('publishing changelog updates...')
+            self.git_provider.publish_comment(f"**Changelog updates:**\n\n{answer}")
+            if settings.pr_update_changelog_prompt.push_changelog_changes:
+                logging.info('Pushing PR changelog updates...')
+                self.push_changelog_update(new_file_content)
+
+    async def _prepare_prediction(self, model: str):
+        logging.info('Getting PR diff...')
+        # we are using extended hunk with line numbers for code suggestions
+        self.patches_diff = get_pr_diff(self.git_provider,
+                                        self.token_handler,
+                                        model,
+                                        add_line_numbers_to_hunks=True,
+                                        disable_extra_lines=True)
+        logging.info('Getting AI prediction...')
+        self.prediction = await self._get_prediction(model)
+
+    async def _get_prediction(self, model: str):
+        variables = copy.deepcopy(self.vars)
+        variables["diff"] = self.patches_diff  # update diff
+        environment = Environment(undefined=StrictUndefined)
+        system_prompt = environment.from_string(settings.pr_update_changelog_prompt.system).render(variables)
+        user_prompt = environment.from_string(settings.pr_update_changelog_prompt.user).render(variables)
+        if settings.config.verbosity_level >= 2:
+            logging.info(f"\nSystem prompt:\n{system_prompt}")
+            logging.info(f"\nUser prompt:\n{user_prompt}")
+        response, finish_reason = await self.ai_handler.chat_completion(model=model, temperature=0.2,
+                                                                        system=system_prompt, user=user_prompt)
+
+        return response
+
+    def _prepare_changelog_update(self) -> Tuple[str,str]:
+        answer = self.prediction.strip().strip("```").strip()
+        new_file_content = answer.strip().strip("```").strip() + "\n\n" + self.changelog_file.decoded_content.decode()
+
+        return new_file_content, answer
+
+    def push_changelog_update(self, new_file_content):
+        self.git_provider.repo_obj.update_file(path=self.changelog_file.path,
+                                               message="Update CHANGELOG.md",
+                                               content=new_file_content,
+                                               sha=self.changelog_file.sha,
+                                               branch=self.git_provider.get_pr_branch())