notify-triager.yml

name: Notify Triagers

on:
  pull_request_target:
    types: [opened, reopened, synchronize, edited, ready_for_review]

jobs:
  Notify-triagers:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4.1.1
        with:
          fetch-depth: 0
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Get commit message
        id: commit-message
        run: |
          # Extract the commit message
          commit_message=$(git log --format=%B -n 1 ${{ github.event.pull_request.head.sha }})
          commit_message=$(echo "$commit_message" | tr '\n' ' ')
          commit_message=$(echo "$commit_message" | sed 's/[<>|]//g' | sed 's/[][]//g' | sed 's/(//g' | sed 's/)//g' | xargs)
          echo "commit_message=$commit_message" >> $GITHUB_OUTPUT

      - name: Check if last commit is a merge commit
        id: check-merge-branch
        run: |
          if [[ "${{ steps.commit-message.outputs.commit_message }}" == *"Merge branch"* ]]; then
            echo "Last commit is a merge commit"
            echo "isMergeCommit=true" >> $GITHUB_OUTPUT
          else
            echo "Last commit message does not contain Merge branch"
            echo "isMergeCommit=false" >> $GITHUB_OUTPUT
          fi

      - name: Count changed files
        id: changed_files
        run: |
          # Get the list of files changed in the latest commit
          changed_files=$(git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.event.pull_request.head.sha }})

          # Initialize counters
          md_count=0
          non_md_count=0

          # Count .md files
          md_count=$(echo "$changed_files" | grep -c '\.md$' || true)
          # Count non-.md files
          non_md_count=$(echo "$changed_files" | grep -vc '\.md$' || true)

          echo "md_count=$md_count" >> $GITHUB_OUTPUT
          echo "non_md_count=$non_md_count" >> $GITHUB_OUTPUT

      - name: Extract Doc Triage Maintainers
        id: doc-triager
        run: |
          docTriagers=$(grep '^#' CODEOWNERS | tail -n 2 | head -n 1)
          echo "docTriagers: $docTriagers"
          prefix="#docTriagers: "
          docTriagers=${docTriagers#$prefix}
          echo "docTriagers=$docTriagers" >> $GITHUB_ENV

      - name: Extract Code Triage Maintainers
        id: code-triager
        run: |
          codeTriagers=$(grep '^#' CODEOWNERS | tail -n 1)
          echo "codeTriagers: $codeTriagers"
          prefix="#codeTriagers: "
          codeTriagers=${codeTriagers#$prefix}
          echo "codeTriagers=$codeTriagers" >> $GITHUB_ENV

      - name: Add Reviewers for code files
        if: ${{ steps.check-merge-branch.outputs.isMergeCommit == 'false' && steps.changed_files.outputs.non_md_count > 0 }}
        run: |
          IFS=' ' read -r -a codeTriagers <<< "${{ env.codeTriagers }}"
          reviewers=$(printf ', "%s"' "${codeTriagers[@]}")
          reviewers=[${reviewers:2}]
          curl \
          -X POST \
          -H "Authorization: token ${{ secrets.GH_TOKEN }}" \
          -H "Accept: application/vnd.github.v3+json" \
          https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/requested_reviewers \
          -d "{
            \"reviewers\": $reviewers
          }"

      - name: Add Reviewers for doc files
        if: ${{ steps.check-merge-branch.outputs.isMergeCommit == 'false' && steps.changed_files.outputs.md_count > 0 }}
        run: |
          IFS=' ' read -r -a docTriagers <<< "${{ env.docTriagers }}"
          reviewers=$(printf ', "%s"' "${docTriagers[@]}")
          reviewers=[${reviewers:2}]
          curl \
          -X POST \
          -H "Authorization: token ${{ secrets.GH_TOKEN }}" \
          -H "Accept: application/vnd.github.v3+json" \
          https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.pull_request.number }}/requested_reviewers \
          -d "{
            \"reviewers\": $reviewers
          }"