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21
.forgejo/workflows/ai-pr-review.yml
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21
.forgejo/workflows/ai-pr-review.yml
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name: AI PR Review
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on:
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pull_request:
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branches:
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- main
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types:
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- opened
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- synchronize
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- reopened
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jobs:
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review:
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runs-on: js-ubuntu-22
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steps:
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- uses: actions/checkout@v4
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- uses: ./
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with:
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api_url: ${{ secrets.AI_API_URL }}
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api_key: ${{ secrets.AI_API_KEY }}
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# model: openai/gpt-oss-120b # optional, this is the default
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69
action.yml
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69
action.yml
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name: AI PR Review
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description: Automated AI-powered PR code review using any OpenAI-compatible endpoint
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inputs:
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api_url:
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description: Base URL of the OpenAI-compatible API endpoint (e.g. https://api.openai.com/v1)
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required: true
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api_key:
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description: API key for the endpoint
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required: true
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model:
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description: Model identifier to use for the review
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required: false
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default: openai/gpt-oss-120b
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github_token:
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description: Token used to post the review comment and fetch PR comments
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required: false
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default: ${{ github.token }}
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runs:
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using: composite
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steps:
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- name: Checkout
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uses: actions/checkout@v4
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with:
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fetch-depth: 0
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- name: Fetch previous review context
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id: context
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shell: bash
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env:
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GITEA_TOKEN: ${{ inputs.github_token }}
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GITEA_SERVER_URL: ${{ github.server_url }}
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REPO: ${{ github.repository }}
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PR_NUMBER: ${{ github.event.pull_request.number }}
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run: bash "${{ github.action_path }}/scripts/fetch-context.sh"
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- name: Generate diff
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id: diff
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shell: bash
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env:
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PREV_SHA: ${{ steps.context.outputs.prev_sha }}
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run: bash "${{ github.action_path }}/scripts/generate-diff.sh"
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- name: Run AI review
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id: ai_review
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shell: bash
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env:
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AI_API_URL: ${{ inputs.api_url }}
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AI_API_KEY: ${{ inputs.api_key }}
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AI_MODEL: ${{ inputs.model }}
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PR_TITLE: ${{ github.event.pull_request.title }}
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PR_BODY: ${{ github.event.pull_request.body }}
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PREV_REVIEW: ${{ steps.context.outputs.prev_review }}
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INCREMENTAL: ${{ steps.diff.outputs.incremental }}
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run: bash "${{ github.action_path }}/scripts/run-review.sh"
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- name: Post review comment
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shell: bash
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env:
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GITEA_TOKEN: ${{ inputs.github_token }}
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GITEA_SERVER_URL: ${{ github.server_url }}
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REPO: ${{ github.repository }}
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PR_NUMBER: ${{ github.event.pull_request.number }}
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REVIEW: ${{ steps.ai_review.outputs.review }}
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CURRENT_SHA: ${{ github.event.pull_request.head.sha }}
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TRUNCATED: ${{ steps.diff.outputs.truncated }}
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INCREMENTAL: ${{ steps.diff.outputs.incremental }}
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run: bash "${{ github.action_path }}/scripts/post-comment.sh"
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9
prompts/review-update.md
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9
prompts/review-update.md
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You are an expert code reviewer continuing a review of a pull request that has been updated.
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Your previous review is included as context. Focus on:
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- What has changed since your last review
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- Whether previously raised issues have been addressed
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- Any new correctness, security, or performance concerns introduced by the new changes
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- New edge cases or missing tests
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Structure your updated review with: **Summary of Changes**, **Resolved Issues** (from your prior review), **New Issues** (critical/minor), and **Suggestions**. Be concise and avoid repeating feedback that is no longer relevant.
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10
prompts/review.md
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10
prompts/review.md
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You are an expert code reviewer. Review the following pull request and provide concise, actionable feedback.
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Focus on:
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- Correctness and potential bugs
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- Security issues
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- Performance concerns
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- Code clarity and maintainability
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- Missing tests or edge cases
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Structure your review with sections: **Summary**, **Issues** (critical/minor), and **Suggestions**. Be concise.
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34
scripts/fetch-context.sh
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34
scripts/fetch-context.sh
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#!/usr/bin/env bash
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# Fetches the previous AI review comment from the PR (if any).
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# Required env vars: GITEA_TOKEN, GITEA_SERVER_URL, REPO, PR_NUMBER
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# Writes to $GITHUB_OUTPUT: prev_sha, prev_review
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set -euo pipefail
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COMMENTS=$(curl -sf \
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-H "Authorization: token ${GITEA_TOKEN}" \
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-H "Content-Type: application/json" \
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"${GITEA_SERVER_URL}/api/v1/repos/${REPO}/issues/${PR_NUMBER}/comments")
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# Find the most recent comment that contains our SHA marker
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PREV_COMMENT=$(echo "$COMMENTS" | jq -r '
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[ .[] | select(.body | contains("<!-- ai-review-sha:")) ] | last | .body // ""
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')
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if [ -z "$PREV_COMMENT" ]; then
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echo "No previous AI review found — will run a full review."
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echo "prev_sha=" >> "$GITHUB_OUTPUT"
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echo "prev_review=" >> "$GITHUB_OUTPUT"
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exit 0
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fi
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PREV_SHA=$(echo "$PREV_COMMENT" | grep -oP '(?<=<!-- ai-review-sha:)[^>]+(?= -->)' || true)
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# Strip the trailing marker line to get just the review body
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PREV_REVIEW=$(echo "$PREV_COMMENT" | sed '/<!-- ai-review-sha:/d')
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echo "Found previous review at commit ${PREV_SHA}"
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echo "prev_sha=${PREV_SHA}" >> "$GITHUB_OUTPUT"
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echo "prev_review<<EOF" >> "$GITHUB_OUTPUT"
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echo "$PREV_REVIEW" >> "$GITHUB_OUTPUT"
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echo "EOF" >> "$GITHUB_OUTPUT"
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26
scripts/generate-diff.sh
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26
scripts/generate-diff.sh
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#!/usr/bin/env bash
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# Required env vars: (none)
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# Optional env vars: PREV_SHA (if set, generates an incremental diff from that commit)
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set -euo pipefail
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git fetch origin main --depth=100
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if [ -n "${PREV_SHA:-}" ] && git cat-file -e "${PREV_SHA}^{commit}" 2>/dev/null; then
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echo "Generating incremental diff from ${PREV_SHA} to HEAD"
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git diff "${PREV_SHA}...HEAD" > pr.diff
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echo "incremental=true" >> "$GITHUB_OUTPUT"
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else
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echo "Generating full diff from origin/main to HEAD"
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git diff origin/main...HEAD > pr.diff
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echo "incremental=false" >> "$GITHUB_OUTPUT"
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fi
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DIFF_SIZE=$(wc -c < pr.diff)
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echo "Diff size: ${DIFF_SIZE} bytes"
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if [ "$DIFF_SIZE" -gt 12288 ]; then
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head -c 12288 pr.diff > pr_truncated.diff
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printf '\n\n[... diff truncated due to size ...]' >> pr_truncated.diff
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mv pr_truncated.diff pr.diff
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echo "truncated=true" >> "$GITHUB_OUTPUT"
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fi
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29
scripts/post-comment.sh
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29
scripts/post-comment.sh
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#!/usr/bin/env bash
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# Required env vars: GITEA_TOKEN, GITEA_SERVER_URL, REPO, PR_NUMBER, REVIEW, CURRENT_SHA
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# Optional env vars: TRUNCATED, INCREMENTAL
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set -euo pipefail
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FOOTER=""
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if [ "${TRUNCATED:-}" = "true" ]; then
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FOOTER="\n\n> **Note:** The diff was truncated to 12 KB. Some changes may not have been reviewed."
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fi
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LABEL="## AI Code Review"
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if [ "${INCREMENTAL:-false}" = "true" ]; then
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LABEL="## AI Code Review (updated)"
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fi
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# Embed the current SHA as a hidden marker so future runs can find it
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BODY=$(jq -n \
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--arg label "$LABEL" \
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--arg review "$REVIEW" \
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--arg footer "$FOOTER" \
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--arg sha "$CURRENT_SHA" \
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'{ body: ($label + "\n\n" + $review + $footer + "\n\n---\n*Automated review powered by AI. Always verify suggestions before applying.*\n<!-- ai-review-sha:" + $sha + " -->") }')
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curl -sf \
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-X POST \
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-H "Authorization: token ${GITEA_TOKEN}" \
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-H "Content-Type: application/json" \
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-d "$BODY" \
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"${GITEA_SERVER_URL}/api/v1/repos/${REPO}/issues/${PR_NUMBER}/comments"
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95
scripts/run-review.sh
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95
scripts/run-review.sh
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#!/usr/bin/env bash
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# Required env vars: AI_API_URL, AI_API_KEY, AI_MODEL, PR_TITLE, PR_BODY
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# Optional env vars: PREV_REVIEW, INCREMENTAL
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# Reads: pr.diff, prompts/review.md (or prompts/review-update.md for incremental)
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# Writes: $GITHUB_OUTPUT (review)
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set -euo pipefail
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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PROMPTS_DIR="${SCRIPT_DIR}/../prompts"
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DIFF=$(cat pr.diff)
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echo "Diff size: $(wc -c < pr.diff) bytes"
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if [ "${INCREMENTAL:-false}" = "true" ] && [ -n "${PREV_REVIEW:-}" ]; then
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echo "Building incremental review with conversation history"
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SYSTEM_PROMPT=$(cat "${PROMPTS_DIR}/review-update.md")
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# Reconstruct conversation: the model previously reviewed an earlier state,
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# now we show it only what changed since then.
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MESSAGES=$(jq -n \
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--arg system "$SYSTEM_PROMPT" \
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--arg prev "$PREV_REVIEW" \
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--arg title "$PR_TITLE" \
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--arg body "$PR_BODY" \
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--arg diff "$DIFF" \
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'[
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{ role: "system", content: $system },
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{ role: "assistant", content: $prev },
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{ role: "user", content: ("The PR has been updated. Here are the new changes since your last review.\n\nPR Title: " + $title + "\nPR Description: " + $body + "\n\nIncremental diff:\n```diff\n" + $diff + "\n```\n\nUpdate your review, keeping previous feedback relevant to unchanged code and focusing new commentary on what has changed.") }
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]')
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else
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echo "Building full review"
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SYSTEM_PROMPT=$(cat "${PROMPTS_DIR}/review.md")
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MESSAGES=$(jq -n \
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--arg system "$SYSTEM_PROMPT" \
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--arg title "$PR_TITLE" \
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--arg body "$PR_BODY" \
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--arg diff "$DIFF" \
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'[
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{ role: "system", content: $system },
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{ role: "user", content: ("PR Title: " + $title + "\nPR Description: " + $body + "\n\nDiff:\n```diff\n" + $diff + "\n```") }
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]')
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fi
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PAYLOAD=$(jq -n \
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--arg model "$AI_MODEL" \
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--argjson messages "$MESSAGES" \
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'{
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model: $model,
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messages: $messages,
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max_tokens: 1024,
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temperature: 0.2
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}')
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echo "Payload size: $(echo "$PAYLOAD" | wc -c) bytes"
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echo "Calling endpoint: ${AI_API_URL%/}/chat/completions"
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echo "Model: ${AI_MODEL}"
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HTTP_RESPONSE=$(curl -s \
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--max-time 120 \
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-w "\n__HTTP_STATUS__:%{http_code}" \
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-H "Authorization: Bearer ${AI_API_KEY}" \
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-H "Content-Type: application/json" \
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-d "$PAYLOAD" \
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"${AI_API_URL%/}/chat/completions")
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CURL_EXIT=$?
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HTTP_STATUS=$(echo "$HTTP_RESPONSE" | grep '__HTTP_STATUS__:' | cut -d: -f2)
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RESPONSE_BODY=$(echo "$HTTP_RESPONSE" | sed '/__HTTP_STATUS__:/d')
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echo "curl exit code: ${CURL_EXIT}"
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echo "HTTP status: ${HTTP_STATUS}"
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echo "Response body: ${RESPONSE_BODY}"
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if [ "$CURL_EXIT" -ne 0 ]; then
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echo "::error::curl failed with exit code ${CURL_EXIT}"
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exit 1
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fi
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if [ "$HTTP_STATUS" -lt 200 ] || [ "$HTTP_STATUS" -ge 300 ]; then
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echo "::error::API returned HTTP ${HTTP_STATUS}: ${RESPONSE_BODY}"
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exit 1
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fi
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REVIEW=$(echo "$RESPONSE_BODY" | jq -r '.choices[0].message.content')
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if [ -z "$REVIEW" ] || [ "$REVIEW" = "null" ]; then
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echo "::error::Failed to extract review from response. Full body: ${RESPONSE_BODY}"
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exit 1
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fi
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echo "Review length: $(echo "$REVIEW" | wc -c) chars"
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echo "review<<EOF" >> "$GITHUB_OUTPUT"
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echo "$REVIEW" >> "$GITHUB_OUTPUT"
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echo "EOF" >> "$GITHUB_OUTPUT"
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