Auto Labeling

A GitHub Action that automates labeling on issues and pull requests.

How it works

auto-labeling automatically detects task lists in the description of an issue or a pull request and adds labels based on their states (checked or unchecked).

<!-- pull_request_template.md -->

What kind of change does this PR introduce?

- [x] `bug-fix`
- [ ] `new-feature`
- [ ] `enhancement`

This description makes auto-labeling add bug-fix. If someone updates the description as follows:

<!-- pull_request_template.md -->

What kind of change does this PR introduce?

- [ ] `bug-fix`
- [ ] `new-feature`
- [x] `enhancement`

Then, auto-labeling removes bug-fix and adds enhancement. Note that unregistered labels are ignored.

Example workflow

name: Auto Labeling

on:
  issues:
    types:
      # Trigger the action only on relevant activity types.
      # It's actually not harmful to trigger the action on all activity types.
      - opened
      - edited

on:
  pull_request:
    types:
      - opened
      - edited

# A GitHub token created for a PR coming from a fork doesn't have
# 'admin' or 'write' permission (which is required to add labels)
# To avoid this issue, you can use the `scheduled` event and run
# this action on a certain interval.
on:
  schedule:
    - cron: '*/10 * * * *'

jobs:
  labeling:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - uses: harupy/auto-labeling@master
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          label-pattern: '- \[(.*?)\] ?`(.+?)`' # matches '- [x] `label`'

Inputs

inputs:
  github-token:
    description: 'GitHub token'
    required: true

  label-pattern:
    description: >
      Pattern (regular expression) to extract label states and names (e.g. '- \[(.*?)\] ?`(.+?)`').
    required: true

  offset:
    description: >
      Only issues and pull requests updated at or after this offset (from the current time) will be labeled.
      Required only when running this action on the schedule event.
    required: false
    default: '1m' # means one month

  quiet:
    description: >
      Suppress logging output. Must be either "true" or "false"
    required: false
    default: 'false'