check_duplicates.yaml

name: Check duplicates

on:
  issues:
    types: [opened]

jobs:
  check_duplicates:
    runs-on: ubuntu-latest
    env:
        title: ${{ github.event.issue.title }}
        author: ${{ github.event.issue.user.login }}
        number: ${{ github.event.issue.number }}
        GH_TOKEN: ${{ github.token }}
    steps:
      - uses: actions/checkout@v6
      - name: Check duplicates
        run: |
          title=$(printf %q "${{ env.title }}")
          issues=$(gh issue list --search '${{ title }}' --json number,title,url)
          number=${{ env.number }}
          issues_filtered=$(echo "$issues" | jq --arg num "$number" 'map(select(.number != ($num | tonumber)))')
          if [ "$(echo "$issues_filtered" | jq length)" -eq 0 ]; then
            echo "No duplicates found."
          else
            issues_markdown=$(echo "$issues_filtered" | jq -r '.[] | "- [" + .title + "](" + .url + ")"')
            formatted_body=$(echo -e "@${{ env.author }}\nPossible duplication of:\n$issues_markdown")
            gh issue comment ${{ github.event.issue.number }} --body "$formatted_body"
          fi