2 files changed, 248 insertions, 0 deletions

diff --git a/.github/workflows/copilot.yml b/.github/workflows/copilot.yml
new file mode 100644
index 00000000..38c24378
--- /dev/null
+++ b/.github/workflows/copilot.yml
@@ -0,0 +1,33 @@
+name: AI Code Reviewer
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+
+env:
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v3
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+            python-version: "3.x"
+            cache: 'pip'
+      - name: Install Requirements
+        run: pip install -r requirements.txt
+      - name: Install PyGithub
+        run: pip install PyGithub
+      - name: AI Code Review
+        run: python -m etc.tool.copilot
\ No newline at end of file
diff --git a/etc/tool/copilot.py b/etc/tool/copilot.py
new file mode 100644
index 00000000..62698c70
--- /dev/null
+++ b/etc/tool/copilot.py
@@ -0,0 +1,215 @@
+import sys
+from pathlib import Path
+
+sys.path.append(str(Path(__file__).parent.parent.parent))
+
+import g4f
+import json
+import os
+import re
+import requests
+from typing import Union
+from github import Github
+from github.PullRequest import PullRequest
+
+g4f.debug.logging = True
+g4f.debug.version_check = False
+
+GITHUB_TOKEN = os.getenv('GITHUB_TOKEN')
+G4F_PROVIDER = os.getenv('G4F_PROVIDER') or g4f.Provider.OpenaiChat
+G4F_MODEL = os.getenv('G4F_MODEL') or g4f.models.gpt_4
+
+def get_pr_details(github: Github) -> PullRequest:
+    """
+    Rteurns the details of the pull request from GitHub.
+
+    Returns:
+        PullRequest: A PullRequest instance.
+    """
+    with open(os.getenv('GITHUB_EVENT_PATH', ''), 'r') as file:
+        data = json.load(file)
+
+    repo = github.get_repo(f"{data['repository']['owner']['login']}/{data['repository']['name']}")
+    pull = repo.get_pull(data['number'])
+
+    return pull
+
+def get_diff(diff_url: str) -> str:
+    """
+    Fetches the diff of the pull request.
+
+    Args:
+        pull (PullRequest): Pull request.
+
+    Returns:
+        str or None: The diff of the pull request or None if not available.
+    """
+    response = requests.get(diff_url)
+    response.raise_for_status()
+    return response.text
+
+def read_json(text: str) -> dict:
+    match = re.search(r"```(json|)\n(?P<code>[\S\s]+?)\n```", text)
+    if match:
+        text = match.group("code")
+    try:
+        return json.loads(text.strip())
+    except json.JSONDecodeError:
+        print("No valid json:", text)
+    return {}
+
+def read_text(text: str) -> dict:
+    match = re.search(r"```(markdown|)\n(?P<text>[\S\s]+?)\n```", text)
+    if match:
+        return match.group("text")
+    return text
+
+def get_ai_response(prompt, as_json: bool = True) -> Union[dict, str]:
+    """
+    Gets a response from g4f API based on the prompt.
+
+    Args:
+        prompt (str): The prompt to send to g4f.
+
+    Returns:
+        dict: The parsed response from g4f.
+    """
+    response = g4f.ChatCompletion.create(
+        G4F_MODEL,
+        [{'role': 'user', 'content': prompt}],
+        G4F_PROVIDER,
+        ignore_stream_and_auth=True
+    )
+    if as_json:
+        return read_json(response)
+    return read_text(response)
+
+def analyze_code(pull: PullRequest, diff: str)-> list:
+    """
+    Analyzes the code changes in the pull request.
+
+    Args:
+        diff (str): The diff of the pull request.
+        pr_details (dict): Details of the pull request.
+
+    Returns:
+        list: List of comments generated by the analysis.
+    """
+    comments = []
+    changed_lines = []
+    current_file_path = None
+    offset_line = 0
+
+    for line in diff.split('\n'):
+        if line.startswith('+++ b/'):
+            current_file_path = line[6:]
+        elif line.startswith('@@'):
+            match = re.search(r'\+([0-9]+?),', line)
+            if match:
+                offset_line = int(match.group(1))
+        elif current_file_path:
+            if line.startswith('\\') or line.startswith('diff'):
+                prompt = create_prompt(changed_lines, pull, current_file_path, offset_line)
+                response = get_ai_response(prompt)
+                for review in response.get('reviews', []):
+                    review['path'] = current_file_path
+                    comments.append(review)
+                changed_lines = []
+                current_file_path = None
+            elif not line.startswith('-'):
+                changed_lines.append(line)
+        
+    return comments
+
+def create_prompt(changed_lines: list, pull: PullRequest, file_path: str, offset_line: int):
+    """
+    Creates a prompt for the g4f model.
+
+    Args:
+        diff (str): The line of code to analyze.
+        pr_details (dict): Details of the pull request.
+
+    Returns:
+        str: The generated prompt.
+    """
+    code = "\n".join([f"{offset_line+idx}:{line}" for idx, line in enumerate(changed_lines)])
+    print("Code:", code)
+    example = '{"reviews": [{"line": <line_number>, "body": "<review comment>"}]}'
+    return f"""Your task is to review pull requests. Instructions:
+- Provide the response in following JSON format: {example}
+- Do not give positive comments or compliments.
+- Provide comments and suggestions ONLY if there is something to improve, otherwise "reviews" should be an empty array.
+- Write the comment in GitHub Markdown format.
+- Use the given description only for the overall context and only comment the code.
+- IMPORTANT: NEVER suggest adding comments to the code.
+
+Review the following code diff in the file "{file_path}" and take the pull request title and description into account when writing the response.
+  
+Pull request title: {pull.title}
+Pull request description:
+---
+{pull.body}
+---
+
+Each line is prefixed by its number. Code to review:
+```
+{code}
+```
+"""
+
+def create_review_prompt(pull: PullRequest, diff: str):
+    """
+    Creates a prompt to create a review.
+
+    Args:
+        diff (str): The line of code to analyze.
+
+    Returns:
+        str: The generated prompt.
+    """
+    return f"""Your task is to review a pull request. Instructions:
+- Your name / you are copilot.
+- Write the review in GitHub Markdown format.
+- Thank the author for contributing to the project.
+- Point out that you might leave a few comments on the files.
+
+Pull request author: {pull.user.name}
+Pull request title: {pull.title}
+Pull request description:
+---
+{pull.body}
+---
+
+Diff:
+```diff
+{diff}
+```
+"""
+
+def main():
+    try:
+        github = Github(GITHUB_TOKEN)
+        pull = get_pr_details(github)
+        diff = get_diff(pull.diff_url)
+    except Exception as e:
+        print(f"Error get details: {e}")
+        exit(1)
+    try:
+        review = get_ai_response(create_review_prompt(pull, diff), False)
+    except Exception as e:
+        print(f"Error create review: {e}")
+        exit(1)
+    try:
+        comments = analyze_code(pull, diff)
+    except Exception as e:
+        print(f"Error analyze: {e}")
+        exit(1)
+    print("Comments:", comments)
+    try:
+        pull.create_review(body=review, comments=comments)
+    except Exception as e:
+        print(f"Error posting review: {e}")
+        exit(1)
+
+if __name__ == "__main__":
+    main()