label-add-conflict.yml

name: Auto Add Label "stale" & Comment Conflicts

on:
  push:
    branches:
      - develop
      - '4.*'
  pull_request:
    branches:
      - develop
      - '4.*'

jobs:
  auto-label-comment-conflict:

    permissions:
      contents: read
      pull-requests: write

    runs-on: ubuntu-22.04
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Get PR List
        id: PR-list
        run: echo "pr_list=$(gh pr list -L 100 --json mergeable,url,labels,author)" >> $GITHUB_OUTPUT
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: 'Add label "stale" and comment'
        env:
          PR_LIST: ${{ steps.PR-list.outputs.pr_list }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |

          IFS=$'\n' # Set Internal Field Separator to newline to handle array elements

          # Iterate through the PRs in PR_LIST
          for pr in $(echo "$PR_LIST" | jq -c '.[]'); do
            mergeable=$(echo "$pr" | jq -r '.mergeable')
            author=$(echo "$pr" | jq -r '.author.login')
            labels=$(echo "$pr" | jq -c '.labels[].name' | tr -d '[]"')
            url=$(echo "$pr" | jq -r '.url')

            # CONFLICTING and no 'stale' label
            if [ "$mergeable" == "CONFLICTING" ] && [[ ! "$labels" == *"stale"* ]]; then
              # Add "stale" label
              gh pr edit $url --add-label "stale"

              # Add a comment
              gh pr comment $url --body ":wave: Hi, @$author!<br><br>We detected conflicts in your PR against the base branch :speak_no_evil:<br>You may want to sync :arrows_counterclockwise: your branch with upstream!<br><br>Ref: [Syncing Your Branch](https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/workflow.md#pushing-your-branch)"
            fi
          done