linux_and_macos.yml

# Copyright (c) 2023 Sebastian Pipping <sebastian@pipping.org>
# Licensed under Apache License Version 2.0

name: Build on Linux/macOS

# Drop permissions to minimum, for security
permissions:
  contents: read

on:
  pull_request:
  push:
  schedule:
    - cron: '0 3 * * 5'  # Every Friday at 3am
  workflow_dispatch:

jobs:
  linux:
    name: Build (${{ matrix.cc }} on ${{ matrix.runs-on }})
    runs-on: ${{ matrix.runs-on }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - cc: gcc-13
            cxx: g++-13
            clang_major_version: null
            clang_repo_suffix: null
            runs-on: ubuntu-22.04
          - cc: clang-17
            cxx: clang++-17
            clang_major_version: 17
            clang_repo_suffix: -17
            runs-on: ubuntu-22.04
          - cc: clang-18
            cxx: clang++-18
            clang_major_version: 18
            clang_repo_suffix:
            runs-on: ubuntu-22.04
          - cc: gcc-13
            cxx: g++-13
            clang_major_version: null
            clang_repo_suffix: null
            runs-on: macos-12
          - cc: clang-15
            cxx: clang++-15
            clang_major_version: 15
            clang_repo_suffix: null
            runs-on: macos-12
    steps:
      - name: Add Clang/LLVM repositories
        if: "${{ runner.os == 'Linux' && contains(matrix.cxx, 'clang') }}"
        run: |-
          set -x
          source /etc/os-release
          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
          sudo add-apt-repository "deb http://apt.llvm.org/${UBUNTU_CODENAME}/ llvm-toolchain-${UBUNTU_CODENAME}${{ matrix.clang_repo_suffix }} main"

      - name: Install build dependencies
        if: "${{ runner.os == 'Linux' }}"
        run: |-
          sudo apt-get update
          sudo apt-get install --yes --no-install-recommends \
            libncurses-dev \
            pkg-config

      - name: Install build dependencies
        if: "${{ runner.os == 'macOS' }}"
        run: |-
          brew tap homebrew/cask-fonts
          brew install \
            agg \
            asciinema \
            coreutils \
            font-liberation \
            imagemagick

      - name: Install build dependency Clang ${{ matrix.clang_major_version }}
        if: "${{ runner.os == 'Linux' && contains(matrix.cxx, 'clang') }}"
        run: |-
          sudo apt-get install --yes --no-install-recommends -V \
              clang-${{ matrix.clang_major_version }}

      - name: Add versioned aliases for Clang ${{ matrix.clang_major_version }}
        if: "${{ runner.os == 'macOS' && contains(matrix.cxx, 'clang') }}"
        run: |-
          set -x
          sudo ln -s "$(brew --prefix llvm@${{ matrix.clang_major_version }})"/bin/clang   /usr/local/bin/clang-${{ matrix.clang_major_version }}
          sudo ln -s "$(brew --prefix llvm@${{ matrix.clang_major_version }})"/bin/clang++ /usr/local/bin/clang++-${{ matrix.clang_major_version }}

      - name: Checkout Git branch
        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11  # v4.1.1

      - name: 'Build'
        env:
          CC: ${{ matrix.cc }}
          CXX: ${{ matrix.cxx }}
        run: |-
          CFLAGS='-std=gnu99 -pedantic -Werror' make all torture

      - name: 'Install'
        run: |-
          set -x -o pipefail
          make install DESTDIR="${PWD}"/ROOT/
          find ROOT/ | sort | xargs ls -ld

      - name: 'Uninstall'
        run: |-
          set -x
          make uninstall DESTDIR="${PWD}"/ROOT/
          [[ "$(find ROOT/ -not -type d | tee /dev/stderr)" == '' ]]  # i.e. fail CI if leftover files

      - name: 'Run UI tests'
        if: "${{ runner.os == 'macOS' }}"
        run: |-
          ./recordings/record.sh

      - name: 'Upload UI test renderings for inspection'
        if: "${{ runner.os == 'macOS' }}"
        uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32  # v3.1.3
        with:
          name: ttyplot_ui_test_${{ github.sha }}_${{ matrix.runs-on }}_${{ matrix.cc }}
          path: recordings/actual*
          if-no-files-found: error

      - name: 'Evaluate UI test results'
        if: "${{ runner.os == 'macOS' }}"
        run: |-
          assert_images_equal_enough() {
            local a="${1}"
            local b="${2}"
            local diff_output="${3}"
            local dissimilarity="$(compare -metric DSSIM "${a}" "${b}" "${diff_output}" 2>&1)"
            if ! python3 <<<"import sys; sys.exit(int(${dissimilarity} > 0.0022))"; then
              echo "Image \"${a}\" is not close enough of a match to image \"${b}\", dissimilarity is ${dissimilarity}." >&2
              return 1
            fi
            true
          }

          cd recordings/

          error=0

          for expected in expected*.png; do
            actual=${expected/expected/actual}
            diff=${expected/expected/diff}

            assert_images_equal_enough ${actual} ${expected} ${diff} || error=1
          done

          rm -f actual*.* diff*.*

          cat <<"EOF"
            ############################################################
            ## If this step FAILS you can get the expected images
            ## back in sync with reality by running:
            ##
            ##   $ ./recordings/get_back_in_sync.sh
            ############################################################
          EOF

          exit ${error}

      - name: 'Clean'
        run: |-
          set -x -o pipefail
          make clean
          [[ "$(git ls-files -o | tee /dev/stderr | wc -l)" -eq 0 ]]