notify-plugin-authors.yml

name: Auto-assign Plugin Reviewers
on:
  pull_request_target:
    types: [opened]
permissions:
  contents: read
  pull-requests: write
  issues: write
jobs:
  assign-reviewers:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
      issues: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 0
      
      - name: Get changed files and assign reviewers
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          PR_AUTHOR: ${{ github.event.pull_request.user.login }}
          REPO: ${{ github.repository }}
        run: |
          # Get the list of changed files in this PR
          changed_files=$(gh pr view $PR_NUMBER --json files --jq '.files[].path')
          
          # Extract unique top-level directories from changed files
          declare -A plugin_dirs
          while IFS= read -r file; do
            # Extract the first directory component (plugin name)
            if [[ "$file" =~ ^([^/]+)/ ]]; then
              plugin_dir="${BASH_REMATCH[1]}"
              # Skip non-plugin directories
              case "$plugin_dir" in
                .git|.github|Bin) continue ;;
              esac
              plugin_dirs["$plugin_dir"]=1
            fi
          done <<< "$changed_files"
          
          # For each modified plugin, find the original author
          declare -A authors
          
          for plugin in "${!plugin_dirs[@]}"; do
            echo "Processing plugin: $plugin"
            
            # Get the first commit author for this plugin
            commit_sha=$(git log --diff-filter=A --format='%H' --reverse -- "$plugin/" 2>/dev/null | head -n 1)
            
            if [[ -z "$commit_sha" ]]; then
              commit_sha=$(git log --format='%H' --reverse -- "$plugin/" 2>/dev/null | head -n 1)
            fi
            
            if [[ -z "$commit_sha" ]]; then
              echo "No commits found for $plugin"
              continue
            fi
            
            # Get GitHub username via API
            api_url="https://api.github.com/repos/$REPO/commits/$commit_sha"
            response=$(gh api "$api_url" 2>/dev/null || echo "")
            
            if [[ -z "$response" ]]; then
              echo "Could not fetch commit info from GitHub API"
              continue
            fi
            
            author=$(echo "$response" | jq -r '.author.login // empty')
            
            if [[ -n "$author" ]]; then
              if [[ "$author" == "$PR_AUTHOR" ]]; then
                echo "Skipping notification for @$author (PR author)"
              else
                echo "Found author for $plugin: @$author"
                authors["$author"]=1
              fi
            fi
          done
          
          # If we found any authors, notify them
          if [[ ${#authors[@]} -eq 0 ]]; then
            echo "No plugin authors found"
            exit 0
          fi
          
          # Build the list of authors
          author_list=(${!authors[@]})
          author_mentions=$(printf '@%s ' "${author_list[@]}")
          
          # Post appropriate comment based on number of plugins
          comment_body=""
          if [[ ${#plugin_dirs[@]} -eq 1 ]]; then
            comment_body="${author_mentions}- this PR modifies your plugin. Please review when you have a chance."
          else
            comment_body="${author_mentions}- this PR modifies your plugins. Please review when you have a chance."
          fi
          
          # Post comment using gh CLI
          gh pr comment "$PR_NUMBER" --body "$comment_body"