This GitHub Action automatically prefixes the title of a pull request with an emoji based on predefined rules in a YAML configuration file located in the .github folder. It will default to .github/emoji-labels.yml if not other path is specified.

name: PR Title Emoji

on: pull_request

jobs:
  stats:
    runs-on: ubuntu-latest
    steps:
      - name: Prefix Emoji to PR Title       
        uses: lisilinhart/[email protected]
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
    #     config_path: '.github/my-labels.yml' (optional)

To use this action, you need to create a configuration file in your repository's .github folder named emoji-labels.yml. This configuration file defines rules that map emojis to specific regular expressions for matching pull request titles. The action will check if the title of a pull request matches any of the defined regular expressions and prepend the corresponding emoji if a match is found.

⚠️ This actions requires the pull_requests permission to be able to read and update pull request titles. Go to https://github.com/OWNER/REPO/settings/actions and under Workflow permissions enable Read and write permissions.

The configuration file should be structured as follows:

labels:
- emoji: "🔨"
  title: ".*build(:|\\().*"
- emoji: "🏗️"
  title: ".*chore:.*"
- emoji: "🚑"
  title: ".*hotfix.*"
# Add more rules as needed

The title property is a regular expression that will be matched against the title of a pull request.

new RegExp(labels.title)

If a match exists and no other emoji is already present in the title, the emoji will be prepended to the title.