name: shfmt-linter

on:
  pull_request:
    branches:
      - master

jobs:
  shellcheck:

    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
      with:
         ref: ${{ github.head_ref }}
    
    - name: update system
      run: |
            sudo apt-get upgrade --install-suggests --yes
        
    - name: install dependencies
      run: |
            sudo apt-get install git \
                                 make

    - name: apply shfmt fixes
      run: |
            docker run --volume "$PWD":/mnt \
                       --rm \
                       mvdan/shfmt -bn -ci -d -i 4 -p -s -sr -w /mnt
                       
    - uses: stefanzweifel/git-auto-commit-action@v4
      with:
        commit_message: (maint) apply shfmt formatting
        commit_options: '--cleanup=default --no-verify --signoff'
        push_options: '--force'
        skip_dirty_check: false