windows.yml

name: Windows CI
on:
  pull_request:
env:
  OPAMROOT: D:\opamroot
  OPAMSOLVERTIMEOUT: 120
  MSYS: winsymlinks:native
jobs:
  analyse:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.matrix.outputs.result }}
    steps:
      - name: Checkout tree
        uses: actions/checkout@v6
        with:
          fetch-depth: 2

      - name: Get changed files
        id: changed-files
        uses: tj-actions/changed-files@v47

      - name: Compute build matrix
        id: matrix
        uses: actions/github-script@v8
        with:
          script: |
            let changed_files = '${{ steps.changed-files.outputs.all_changed_files }}';
            let packages = [];
            for (file of changed_files.split(' ')) {
              console.log("Changed: " + file);
              const package = file.match(/^packages\/[^/]+\/([^/]+)/);
              if (package)
                packages.push(package[1]);
            }
            const splits =
              Array.from({ length: Math.ceil(packages.length / 75) },
                         (_, i) => packages.slice(i * 75, i * 75 + 75).join(' '));
            return {build_env: ['cygwin', 'msys2'], packages: splits};

  build:
    name: "target/host: x86_64-w64-mingw32, build: ${{ matrix.build_env }}"
    strategy:
      fail-fast: false
      matrix: ${{ fromJSON(needs.analyse.outputs.matrix) }}
    if: ${{ join(fromJSON(needs.analyse.outputs.matrix).packages) != '' }}
    runs-on: windows-latest
    needs: analyse
    steps:
      - name: Checkout tree
        uses: actions/checkout@v6
        with:
          fetch-depth: 2

      - name: Download install.ps1
        run: |
          [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
          (New-Object System.Net.WebClient).DownloadFile("https://raw.githubusercontent.com/ocaml/opam/master/shell/install.ps1", ".\install.ps1")

      - name: Restore opam cache
        id: cache-opam
        uses: actions/cache/restore@v5
        with:
          path: |
            D:\opam\bin
            D:\opamroot
          key: ${{ runner.os }}-${{ matrix.build_env }}-opam-${{ hashFiles('install.ps1') }}

      - name: Add MSYS2 to PATH and install prerequisites
        if: matrix.build_env == 'msys2'
        run: |
          "C:\msys64" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
          C:\msys64\usr\bin\pacman.exe --noconfirm -Syuu  # Core update (in case any core packages are outdated)
          C:\msys64\usr\bin\pacman.exe --noconfirm -Syuu m4 make mingw-w64-i686-gcc mingw-w64-x86_64-gcc rsync unzip

      - name: Install opam
        if: steps.cache-opam.outputs.cache-hit != 'true'
        run: |
          Invoke-Expression "& ./install.ps1 -OpamBinDir 'D:\opam\bin'"

      - name: Add opam to PATH
        run: |
          D:\opam\bin\opam --version
          "D:\opam\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append

      - name: Init opam
        if: steps.cache-opam.outputs.cache-hit != 'true'
        run: opam init --yes --no-setup ${{ matrix.build_env == 'msys2' && '--cygwin-local-install' || '' }} .

      - name: Restrict testing to available compilers
        if: steps.cache-opam.outputs.cache-hit != 'true'
        # TODO Amend this lowerbound as older compiler packages are updated
        run: opam switch set-invariant --formula "`"ocaml`" {>= `"4.13`"}"

      - name: Save opam cache
        if: steps.cache-opam.outputs.cache-hit != 'true'
        uses: actions/cache/save@v5
        with:
          path: |
            D:\opam\bin
            D:\opamroot
          key: ${{ steps.cache-opam.outputs.cache-primary-key }}

      - name: Print version and configuration information
        run: |
          opam --version
          opam exec -- ocaml -version
          opam exec -- ocamlopt -config
          opam var

      - name: Install packages
        run: |
          $failed = $false
          opam update
          Foreach ($pkg in '${{ matrix.packages }}' -split ' ') {
            Write-Host "::group::Testing `e[1;34m$pkg`e[0m"
            opam install --color=always --confirm-level=unsafe-yes "$pkg"
            Write-Host "::endgroup::"
            switch ($LASTEXITCODE) {
              0 { Write-Host "`e[1;32m$pkg installed successfully`e[0m."; Break }
              5 { Write-Host "$pkg is not installable. `e[1;33mSkip`e[0m."; Break } # TODO: Remove when https://github.com/ocaml/opam/issues/6017 is fixed
              20 { Write-Host "$pkg is not installable. `e[1;33mSkip`e[0m."; Break }
              31 { Write-Host "`e[1;31m$pkg failed to build`e[0m."; $failed = $true; Break }
              default { throw "Unexpected error $_" }
            }
            Write-Host
          }
          if ($failed) {
            throw "One or more packages failed to build"
          }
          Exit