windows_build.yml

name: windows-build

on:
  pull_request:
  workflow_dispatch:

jobs:

  check-diff:
    runs-on: ubuntu-latest
    outputs: 
      handle: ${{ steps.check.outputs.run }}
    steps:

      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          fetch-depth: 2

      # The goal is to force this to pass if it does not need to run.
      - name: Check the diff
        id: check
        run: |
          echo "Here are the changed build/C files:"
          echo "$(git --no-pager diff --name-only HEAD HEAD~1 | grep -E '\.(c|h)$|\.cmake|CMakeLists|Config\.cmake\.in')"
          if git --no-pager diff --name-only HEAD HEAD~1 | grep -qE '\.(c|h)$|\.cmake|CMakeLists|Config\.cmake\.in'; then
            echo "run=true" >> $GITHUB_OUTPUT
            echo "Implementation and/or build files have changed, rebuilding..."
          else
            echo "run=false" >> $GITHUB_OUTPUT
            echo "Implementation and/or build files have NOT changed, skipping build..."
          fi

  build:
    runs-on: windows-latest
    needs: check-diff
    if: ${{ needs.check-diff.outputs.handle == 'true' }}

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

    - name: Setup cl.exe
      uses: ilammy/msvc-dev-cmd@v1

    - name: Configure with CMake
      run: cmake -S . -B build -DCMAKE_INSTALL_PREFIX=install/ -DCMAKE_BUILD_TYPE=Release -G "NMake Makefiles"

    - name: Build with nmake
      run: |
        cmake --build build --config Release --target install

    - name: Clean the Install
      run: |
        Remove-Item -Path install -Recurse
        Remove-Item -Path build -Recurse

    - name: Build Shared
      run: |
        cmake -S . -B build -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=install/ -DCMAKE_BUILD_TYPE=Release -G "NMake Makefiles"
        cmake --build build --config Release --target install