name: Shellcheck

on:
  push:
    branches:
      - main
  pull_request:
  workflow_dispatch:
  schedule:
    - cron: "5 1 * * *"

jobs:
  shellcheck:
    name: Shellcheck
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v4

    - name: Get changed files
      id: changed-files
      uses: tj-actions/changed-files@v45
      with:
        files: |
          **.sh

    # This is a manual copy from https://github.com/ludeeus/action-shellcheck/blob/00b27aa7cb85167568cb48a3838b75f4265f2bca/action.yaml#L59
    # Why? Because the action is not capable of adding ONLY a list of files.
    # We aim to only check the files that have changed.
    # This is used as we deal with a codebase that throws a lot of warnings.
    # Checking only the changed files is a good compromise to improve the codebase over time.
    - name: Download shellcheck
      shell: bash
      env:
        INPUT_VERSION: "v0.10.0"
      run: |
        set -euo pipefail
        if [[ "${{ runner.os }}" == "macOS" ]]; then
          osvariant="darwin"
        else
          osvariant="linux"
        fi
    
        baseurl="https://github.com/koalaman/shellcheck/releases/download"
        curl -Lso "${{ github.action_path }}/sc.tar.xz" \
          "${baseurl}/${INPUT_VERSION}/shellcheck-${INPUT_VERSION}.${osvariant}.x86_64.tar.xz"
    
        mkdir -p "${{ github.action_path }}/shellcheck-${INPUT_VERSION}"
        tar -xf "${{ github.action_path }}/sc.tar.xz" -C "${{ github.action_path }}"
        mv "${{ github.action_path }}/shellcheck-${INPUT_VERSION}/shellcheck" \
          "${{ github.action_path }}/shellcheck"

    - name: Display shellcheck version
      shell: bash
      run: |
        "${{ github.action_path }}/shellcheck" --version

    - name: Run ShellCheck
      if: steps.changed-files-specific.outputs.any_changed == 'true'
      env:
        ALL_CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
      run: |
        echo "${ALL_CHANGED_FILES}" | xargs shellcheck