name: Markdownlint

on:
  push:
    paths:
      - "**/*.md"
      - ".markdownlint.json"
      - ".github/workflows/markdownlint.yml"
      - ".github/workflows/markdownlint-problem-matcher.json"
  pull_request:
    paths:
      - "**/*.md"
      - ".markdownlint.json"
      - ".github/workflows/markdownlint.yml"
      - ".github/workflows/markdownlint-problem-matcher.json"

jobs:
  lint:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@a81bbbf8298c0fa03ea29cdc473d45769f953675 #@v2
    - name: Use Node.js
      uses: actions/setup-node@56899e050abffc08c2b3b61f3ec6a79a9dc3223d #@v1
      with:
        node-version: 12.x
    - name: Run Markdownlint
      run: |
        echo "::add-matcher::.github/workflows/markdownlint-problem-matcher.json"
        npm i -g markdownlint-cli
        markdownlint "**/*.md"