check for lable.yaml

name: Check for label on pull request

on:
  pull_request:
    types: [opened, labeled, unlabeled]
    branches:
      - main

jobs:
  check-lables:
    runs-on: ubuntu-latest
    
    steps:  
      - name: Get PR labels
        run: |
          PR_LABELS="${{ join(github.event.pull_request.labels.*.name, ',') }}"
          echo "PR_LABELS=$PR_LABELS" >> $GITHUB_ENV
          echo "Labels fetched: $PR_LABELS"

      - name: Calculate number of labels
        run: |
          LABEL_COUNT=$(echo "$PR_LABELS" | awk -F',' '{print NF}')
          echo "LABEL_COUNT=$LABEL_COUNT" >> $GITHUB_ENV
      
      - name: Contains lable
        if:  ${{ env.LABEL_COUNT == '0' }}
        run: |
          echo "The pull request needs a lable."
          exit 1 #This fails the action
      
      - name: Check if pull request labels combination is okay
        run: |
          #if it has exatly one label there is no combination
          if [ "$LABEL_COUNT" -eq 1 ] exit 0; fi

          #E alows for use of or operators
          #breaking
          if echo "$PR_LABELS" | grep -q "\bbreaking\b"; then
            NOT_ALLOWED_LABELS="refactor|test|workflow"
            if echo "$PR_LABELS" | grep -qE "\b($NOT_ALLOWED_LABELS)\b"; then
              exit 1
            fi
          #bug
          elif echo "$PR_LABELS" | grep -q "\bbug\b"; then
            NOT_ALLOWED_LABELS="refactor"
            if echo "$PR_LABELS" | grep -qE "\b($NOT_ALLOWED_LABELS)\b"; then
              exit 1
            fi
          #feature
          elif echo "$PR_LABELS" | grep -q "\bfeature\b"; then
            NOT_ALLOWED_LABELS="refactor|test"
            if echo "$PR_LABELS" | grep -qE "\b($NOT_ALLOWED_LABELS)\b"; then
              exit 1
            fi
          fi