auto-assign-issue.yml

name: Auto Assign Issues On Comment

on:
  issue_comment:
    types: [created]

permissions:
  issues: write

jobs:
  auto-assign:
    runs-on: ubuntu-latest
    if: (!github.event.issue.pull_request) && github.event.comment.body == '/assign'
    concurrency:
      # Only run one at a time per user
      group: ${{ github.actor }}-auto-assign-issue
    steps:
      - name: Check current issue assignees
        id: check-assignee
        run: |
          RESPONSE=$(curl -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
          https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.issue.number }})
          CURRENT_ASSIGNEES=$(echo "$RESPONSE" | jq -r '.assignees[].login')

          # Check if the commenter is already assigned
          if echo "$CURRENT_ASSIGNEES" | grep -q "${{ github.event.comment.user.login }}"; then
            echo "ASSIGNMENT_STATUS=already_assigned" >> $GITHUB_ENV

          # Check if someone else is already assigned
          elif [ -n "$CURRENT_ASSIGNEES" ]; then
            echo "ASSIGNMENT_STATUS=assigned_to_others" >> $GITHUB_ENV

          # No one is assigned, issue can be assigned to the commenter
          else
            echo "ASSIGNMENT_STATUS=can_assign" >> $GITHUB_ENV
          fi

      - name: Assign issue to commenter
        if: env.ASSIGNMENT_STATUS == 'can_assign'
        run: |
          echo "Assigning issue #${{ github.event.issue.number }} to @${{ github.event.comment.user.login }}"
          curl -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
          -d '{"assignees": ["${{ github.event.comment.user.login }}"]}' \
          https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.issue.number }}/assignees

      - name: Log already assigned
        if: env.ASSIGNMENT_STATUS == 'already_assigned'
        run: |
          echo "Issue #${{ github.event.issue.number }} is already assigned to @${{ github.event.comment.user.login }}."

      - name: Log issue assigned to someone else
        if: env.ASSIGNMENT_STATUS == 'assigned_to_others'
        run: |
          echo "Issue #${{ github.event.issue.number }} is already assigned to someone else: $CURRENT_ASSIGNEES."

      - name: Comment on the issue based on outcome
        run: |
          if [ "${{ env.ASSIGNMENT_STATUS }}" == "can_assign" ]; then
            COMMENT_BODY="Issue #${{ github.event.issue.number }} has been successfully assigned to @${{ github.event.comment.user.login }}."
          elif [ "${{ env.ASSIGNMENT_STATUS }}" == "already_assigned" ]; then
            COMMENT_BODY="Issue #${{ github.event.issue.number }} is already assigned to you, @${{ github.event.comment.user.login }}."
          else
            COMMENT_BODY="Issue #${{ github.event.issue.number }} is already assigned to someone else: $CURRENT_ASSIGNEES."
          fi

          curl -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
          -d '{"body": "'"${COMMENT_BODY}"'"}' \
          https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.issue.number }}/comments