feat: rigging pr decorator for robopage prs

.github/PULL_REQUEST_TEMPLATE.md

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+# robopages
+
+## Welcome
+
+Hello and welcome to robopages, thanks for contributing! You can leave the PR description blank and let [rigging](https://github.com/dreadnode/rigging) perform some magic here.

.github/scripts/rigging_pr_decorator.py

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+import asyncio
+import base64
+import os
+import typing as t
+
+from pydantic import ConfigDict, StringConstraints
+
+import rigging as rg
+from rigging import logger
+from rigging.generator import GenerateParams, Generator, register_generator
+
+logger.enable("rigging")
+
+MAX_TOKENS = 8000
+TRUNCATION_WARNING = "\n\n**Note**: Due to the large size of this diff, some content has been truncated."
+str_strip = t.Annotated[str, StringConstraints(strip_whitespace=True)]
+
+
+class PRDiffData(rg.Model):
+    """XML model for PR diff data"""
+
+    content: str_strip = rg.element()
+
+    @classmethod
+    def xml_example(cls) -> str:
+        return """<diff><content>example diff content</content></diff>"""
+
+
+class PRDecorator(Generator):
+    """Generator for creating PR descriptions"""
+
+    model_config = ConfigDict(arbitrary_types_allowed=True, validate_assignment=True)
+
+    api_key: str = ""
+    max_tokens: int = MAX_TOKENS
+
+    def __init__(self, model: str, params: rg.GenerateParams) -> None:
+        api_key = params.extra.get("api_key")
+        if not api_key:
+            raise ValueError("api_key is required in params.extra")
+
+        super().__init__(model=model, params=params, api_key=api_key)
+        self.api_key = api_key
+        self.max_tokens = params.max_tokens or MAX_TOKENS
+
+    async def generate_messages(
+        self,
+        messages: t.Sequence[t.Sequence[rg.Message]],
+        params: t.Sequence[GenerateParams],
+    ) -> t.Sequence[rg.GeneratedMessage]:
+        responses = []
+        for message_seq, p in zip(messages, params):
+            base_generator = rg.get_generator(self.model, params=p)
+            llm_response = await base_generator.generate_messages([message_seq], [p])
+            responses.extend(llm_response)
+        return responses
+
+
+register_generator("pr_decorator", PRDecorator)
+
+
+async def generate_pr_description(diff_text: str) -> str:
+    """Generate a PR description from the diff text"""
+    diff_tokens = len(diff_text) // 4
+    if diff_tokens >= MAX_TOKENS:
+        char_limit = (MAX_TOKENS * 4) - len(TRUNCATION_WARNING)
+        diff_text = diff_text[:char_limit] + TRUNCATION_WARNING
+
+    diff_data = PRDiffData(content=diff_text)
+    params = rg.GenerateParams(
+        extra={
+            "api_key": os.environ["OPENAI_API_KEY"],
+            "diff_text": diff_text,
+        },
+        temperature=0.7,
+        max_tokens=500,
+    )
+
+    generator = rg.get_generator("pr_decorator!gpt-4-turbo-preview", params=params)
+    prompt = f"""You are a helpful AI that generates clear and concise PR descriptions.
+    Analyze the provided diff between {PRDiffData.xml_example()} tags and create a summary using exactly this format:
+
+    ### PR Summary
+
+    #### Overview of Changes
+    <overview paragraph>
+
+    #### Key Modifications
+    1. **<modification title>**: <description>
+    2. **<modification title>**: <description>
+    3. **<modification title>**: <description>
+    (continue as needed)
+
+    #### Potential Impact
+    - <impact point 1>
+    - <impact point 2>
+    - <impact point 3>
+    (continue as needed)
+
+    Here is the PR diff to analyze:
+    {diff_data.to_xml()}"""
+
+    chat = await generator.chat(prompt).run()
+    return chat.last.content.strip()
+
+
+async def main():
+    """Main function for CI environment"""
+    if not os.environ.get("OPENAI_API_KEY"):
+        raise ValueError("OPENAI_API_KEY environment variable must be set")
+
+    try:
+        diff_text = os.environ.get("GIT_DIFF", "")
+        if not diff_text:
+            raise ValueError("No diff found in GIT_DIFF environment variable")
+
+        try:
+            diff_text = base64.b64decode(diff_text).decode("utf-8")
+        except Exception:
+            padding = 4 - (len(diff_text) % 4)
+            if padding != 4:
+                diff_text += "=" * padding
+            diff_text = base64.b64decode(diff_text).decode("utf-8")
+
+        logger.debug(f"Processing diff of length: {len(diff_text)}")
+        description = await generate_pr_description(diff_text)
+
+        with open(os.environ["GITHUB_OUTPUT"], "a") as f:
+            f.write("content<<EOF\n")
+            f.write(description)
+            f.write("\nEOF\n")
+            f.write(f"debug_diff_length={len(diff_text)}\n")
+            f.write(f"debug_description_length={len(description)}\n")
+            debug_preview = description[:500]
+            f.write("debug_preview<<EOF\n")
+            f.write(debug_preview)
+            f.write("\nEOF\n")
+
+    except Exception as e:
+        logger.error(f"Error in main: {e}")
+        raise
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

.github/workflows/rigging_pr_description.yml

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+name: Update PR Description with Rigging
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  update-description:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 #v4.2.2
+        with:
+          fetch-depth: 0
+
+      # Get the diff first
+      - name: Get Diff
+        id: diff
+        run: |
+          git fetch origin ${{ github.base_ref }}
+          MERGE_BASE=$(git merge-base HEAD origin/${{ github.base_ref }})
+          # Encode the diff as base64 to preserve all characters
+          DIFF=$(git diff $MERGE_BASE..HEAD | base64 -w 0)
+          echo "diff=$DIFF" >> $GITHUB_OUTPUT
+
+      - uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b #v5.0.3
+        with:
+          python-version: "3.11"
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip cache purge
+          pip install pydantic==2.9.1
+          pip install rigging[all]
+
+      # Generate the description using the diff
+      - name: Generate PR Description
+        id: description
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+          PR_NUMBER: ${{ github.event.pull_request.number }}
+          GIT_DIFF: ${{ steps.diff.outputs.diff }}
+        run: |
+          python .github/scripts/rigging_pr_decorator.py
+
+      # Update the PR description
+      - name: Update PR Description
+        uses: nefrob/pr-description@4dcc9f3ad5ec06b2a197c5f8f93db5e69d2fdca7 #v1.2.0
+        with:
+          content: |
+            ## AI-Generated Summary
+
+            ${{ steps.description.outputs.content }}
+
+            ---
+
+            This summary was generated with ❤️ by [rigging](https://rigging.dreadnode.io/)
+          regex: ".*"
+          regexFlags: s
+          token: ${{ secrets.GITHUB_TOKEN }}