.github/workflows/similar-issues.yml

name: duplicate-issues

on:
    issues:
        types: [opened]
    workflow_dispatch:
        inputs:
            issue_number:
                description: Issue number to check manually
                required: true
                type: number

jobs:
    check-duplicates:
        runs-on: ubuntu-latest
        permissions:
            contents: read
            issues: write
        steps:
            - name: Checkout repository
              uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

            - name: Set up Bun
              uses: oven-sh/setup-bun@3d267786b128fe76c2f16a390aa2448b815359f3 # v2.1.2

            - name: Install opencode
              run: curl -fsSL https://opencode.ai/install | bash

            - name: Check for duplicate issues
              env:
                  OPENCODE_API_KEY: ${{ secrets.OPENCODE_API_KEY }}
                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
                  ISSUE_NUMBER: ${{ github.event.issue.number || inputs.issue_number }}
                  OPENCODE_PERMISSION: |
                      {
                        "bash": {
                          "*": "deny",
                          "gh issue*": "allow"
                        },
                        "webfetch": "deny"
                      }
              run: |
                  if [ -z "$ISSUE_NUMBER" ]; then
                    echo "issue_number is required"
                    exit 1
                  fi

                  opencode run -m ${{ vars.OPENCODE_MODEL }} "A new issue has been created:'

                  Issue number:
                  $ISSUE_NUMBER

                  Lookup this issue and search through existing issues (excluding #$ISSUE_NUMBER) in this repository to find any potential duplicates of this new issue.
                  Consider:
                  1. Similar titles or descriptions
                  2. Same error messages or symptoms
                  3. Related functionality or components
                  4. Similar feature requests

                  If you find any potential duplicates, please comment on the new issue with:
                  - A brief explanation of why it might be a duplicate
                  - Links to the potentially duplicate issues
                  - A suggestion to check those issues first

                  Use this format for the comment:
                  'This issue might be a duplicate of existing issues. Please check:
                  - #[issue_number]: [brief description of similarity]

                  Feel free to ignore if none of these address your specific case.'

                  If no clear duplicates are found, do not comment."