unit-tests.yml

---
name: unit-tests
on: [push, pull_request]
jobs:
  unit-tests:
    defaults:
      run:
        shell: sh
    strategy:
      fail-fast: false
      matrix:
        os:
          - ubuntu
        awk:
          - busybox-awk  # BusyBox
          - gawk
          - mawk
        include:
          - { os: macos, awk: awk }  # "Apple" awk
          - { os: macos, awk: nawk }
    runs-on: ${{ matrix.os }}-latest
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Prepare system
        id: prepare-system
        env:
          MATRIX_OS: ${{ matrix.os }}
          MATRIX_AWK: ${{ matrix.awk }}
        run: |
          echo '::group::Install dependencies'

          set -x
          case ${MATRIX_OS%%-*}
          in
            (macos)
              brew install colordiff ;;
            (ubuntu)
              sudo apt-get install colordiff ;;
          esac

          case ${MATRIX_OS%%-*}-${MATRIX_AWK}
          in
            (macos-awk)
              echo "AWK=$(command -v awk)" >>"${GITHUB_ENV:?}"
              ;;
            (macos-nawk)
              brew install awk
              echo "AWK=$(command -v awk)" >>"${GITHUB_ENV:?}"
              ;;
            (ubuntu-gawk|ubuntu-mawk)
              sudo apt-get -y install "${MATRIX_AWK}"
              echo "AWK=$(command -v "${MATRIX_AWK}")" >>"${GITHUB_ENV:?}"
              ;;
            (ubuntu-busybox-awk)
              sudo apt-get -y install busybox

              mkdir -p ~/.local/bin
              printf >~/.local/bin/busybox-awk "#!/bin/sh\\nexec %s awk \"\$@\"\\n" "$(command -v busybox)"
              chmod +x ~/.local/bin/busybox-awk

              echo "AWK=$(cd ~ && pwd -P)/.local/bin/busybox-awk" >>"${GITHUB_ENV:?}"
              ;;
            (*)
          esac

          echo '::endgroup::'
      - name: Information
        env:
          MATRIX_OS: ${{ matrix.os }}
          MATRIX_AWK: ${{ matrix.awk }}
          AWK: ${{ env.AWK }}
        run: |
          echo '::group::Software versions'

          printf 'Kernel:\n'
          uname -a

          printf '\nPATH:\n%s\n' "${PATH}"

          printf '\nShell: %s\n' "${SHELL-?}"

          printf '\nAWK (%s):\n' "${AWK:-?}"
          case ${MATRIX_OS%%-*}-${MATRIX_AWK}
          in
            (macos-awk|macos-nawk|*-gawk)
              "${AWK:?}" --version ;;
            (*-mawk)
              "${AWK:?}" -W version ;;
            (*-busybox-awk)
              busybox --version | sed -n -e '/^\$/q' -e 'p' ;;
            (*)
              printf '%s\n' ? ;;
          esac

          echo '::endgroup::'
      - name: Run unit tests
        run: |
          make AWK='${{ env.AWK }}' test