check-shell-task.yml

# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-shell-task.md
name: Check Shell Scripts

# See: https://docs.github.com/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows
on:
  create:
  push:
    paths:
      - ".github/workflows/check-shell-task.ya?ml"
      - "Taskfile.ya?ml"
      - "**/.editorconfig"
      - "**.bash"
      - "**.sh"
  pull_request:
    paths:
      - ".github/workflows/check-shell-task.ya?ml"
      - "Taskfile.ya?ml"
      - "**/.editorconfig"
      - "**.bash"
      - "**.sh"
  schedule:
    # Run every Tuesday at 8 AM UTC to catch breakage caused by tool changes.
    - cron: "0 8 * * TUE"
  workflow_dispatch:
  repository_dispatch:

jobs:
  run-determination:
    runs-on: ubuntu-latest
    permissions: {}
    outputs:
      result: ${{ steps.determination.outputs.result }}
    steps:
      - name: Determine if the rest of the workflow should run
        id: determination
        run: |
          RELEASE_BRANCH_REGEX="refs/heads/[0-9]+.[0-9]+.x"
          # The `create` event trigger doesn't support `branches` filters, so it's necessary to use Bash instead.
          if [[
            "${{ github.event_name }}" != "create" ||
            "${{ github.ref }}" =~ $RELEASE_BRANCH_REGEX
          ]]; then
            # Run the other jobs.
            RESULT="true"
          else
            # There is no need to run the other jobs.
            RESULT="false"
          fi

          echo "result=$RESULT" >> $GITHUB_OUTPUT

  lint:
    name: ${{ matrix.configuration.name }} (${{ matrix.script }})
    needs: run-determination
    if: needs.run-determination.outputs.result == 'true'
    runs-on: ubuntu-latest
    permissions:
      contents: read

    env:
      # See: https://github.com/koalaman/shellcheck/releases/latest
      SHELLCHECK_RELEASE_ASSET_SUFFIX: .linux.x86_64.tar.xz

    strategy:
      fail-fast: false

      matrix:
        configuration:
          - name: Generate problem matcher output
            # ShellCheck's "gcc" output format is required for annotated diffs, but inferior for humans reading the log.
            format: gcc
            # The other matrix job is used to set the result, so this job is configured to always pass.
            continue-on-error: true
          - name: ShellCheck
            # ShellCheck's "tty" output format is most suitable for humans reading the log.
            format: tty
            continue-on-error: false
        script:
          # TODO: add paths of all scripts in an array here.
          - TODO: path to a script.

    steps:
      - name: Set environment variables
        run: |
          # See: https://docs.github.com/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#setting-an-environment-variable
          echo "INSTALL_PATH=${{ runner.temp }}/shellcheck" >> "$GITHUB_ENV"

      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install Task
        uses: arduino/setup-task@v2
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          version: 3.x

      - name: Download latest ShellCheck release binary package
        id: download
        uses: MrOctopus/download-asset-action@1.0
        with:
          repository: koalaman/shellcheck
          excludes: prerelease, draft
          asset: ${{ env.SHELLCHECK_RELEASE_ASSET_SUFFIX }}
          target: ${{ env.INSTALL_PATH }}

      - name: Install ShellCheck
        run: |
          cd "${{ env.INSTALL_PATH }}"
          tar --extract --file="${{ steps.download.outputs.name }}"
          EXTRACTION_FOLDER="$(
            basename \
              "${{ steps.download.outputs.name }}" \
              "${{ env.SHELLCHECK_RELEASE_ASSET_SUFFIX }}"
          )"
          # Add installation to PATH:
          # See: https://docs.github.com/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#adding-a-system-path
          echo "${{ env.INSTALL_PATH }}/$EXTRACTION_FOLDER" >> "$GITHUB_PATH"

      - name: Run ShellCheck
        uses: liskin/gh-problem-matcher-wrap@v3
        continue-on-error: ${{ matrix.configuration.continue-on-error }}
        with:
          linters: gcc
          run: |
            task \
              --silent \
              shell:check \
              SCRIPT_PATH="${{ matrix.script }}" \
              SHELLCHECK_FORMAT=${{ matrix.configuration.format }}

  formatting:
    name: formatting (${{ matrix.script }})
    needs: run-determination
    if: needs.run-determination.outputs.result == 'true'
    runs-on: ubuntu-latest
    permissions:
      contents: read

    strategy:
      fail-fast: false

      matrix:
        script:
          # TODO: add paths of all scripts in an array here.
          - TODO: path to a script.

    steps:
      - name: Set environment variables
        run: |
          # See: https://docs.github.com/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#setting-an-environment-variable
          echo "SHFMT_INSTALL_PATH=${{ runner.temp }}/shfmt" >> "$GITHUB_ENV"

      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install Task
        uses: arduino/setup-task@v2
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          version: 3.x

      - name: Download shfmt
        id: download
        uses: MrOctopus/download-asset-action@1.0
        with:
          repository: mvdan/sh
          excludes: prerelease, draft
          asset: _linux_amd64
          target: ${{ env.SHFMT_INSTALL_PATH }}

      - name: Install shfmt
        run: |
          # Executable permissions of release assets are lost
          chmod +x "${{ env.SHFMT_INSTALL_PATH }}/${{ steps.download.outputs.name }}"
          # Standardize binary name
          mv "${{ env.SHFMT_INSTALL_PATH }}/${{ steps.download.outputs.name }}" "${{ env.SHFMT_INSTALL_PATH }}/shfmt"
          # Add installation to PATH:
          # See: https://docs.github.com/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#adding-a-system-path
          echo "${{ env.SHFMT_INSTALL_PATH }}" >> "$GITHUB_PATH"

      - name: Format shell scripts
        run: |
          task \
            --silent \
            shell:format \
            SCRIPT_PATH="${{ matrix.script }}"

      - name: Check formatting
        run: git diff --color --exit-code

  executable:
    name: executable (${{ matrix.script }})
    needs: run-determination
    if: needs.run-determination.outputs.result == 'true'
    runs-on: ubuntu-latest
    permissions:
      contents: read

    strategy:
      fail-fast: false

      matrix:
        script:
          # TODO: add paths of all scripts in an array here.
          - TODO: path to a script.

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install Task
        uses: arduino/setup-task@v2
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          version: 3.x

      - name: Check for non-executable scripts
        run: |
          task \
            --silent \
            shell:check-mode \
            SCRIPT_PATH="${{ matrix.script }}"