windows.yml

name: Windows CI
on:
  push:
    branches:
      - 'master'
  pull_request:
env:
  OPAMROOT: D:\opamroot
  OPAMSOLVERTIMEOUT: 120
jobs:
  build:
    strategy:
      matrix:
        os:
          - windows-latest
    runs-on: ${{ matrix.os }}
    steps:
      - name: Checkout tree
        uses: actions/checkout@v4

      - 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@v4
        with:
          path: |
            D:\opam\bin
            D:\opamroot
          key: ${{ runner.os }}-opam-${{ hashFiles('install.ps1') }}

      - 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 .

      - 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@v4
        with:
          path: |
            D:\opam\bin
            D:\opamroot
          key: ${{ steps.cache-opam.outputs.cache-primary-key }}

      - name: Print version information
        run: |
          opam --version
          opam exec -- ocaml -version

      - name: Get changed files
        id: changed-files
        if: github.event_name != 'push'
        uses: tj-actions/changed-files@v44

      - name: List all changed packages
        id: changed-packages
        if: github.event_name != 'push'
        env:
          ALL_CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
        run: |
          $output = @()
          Foreach ($file in ($env:ALL_CHANGED_FILES).Split(" ")) {
            switch -Regex ($file) {
              '^packages\\[^\\]*\\([^\\]*)\\.*' { $output += "$($matches[1])"; Break }
              default { Write-Host "$file skipped"; Break }
            }
          }
          $outputJson = $output | ConvertTo-Json
          "data<<@@@" | Out-File -FilePath $env:GITHUB_OUTPUT -Encoding utf8 -Append
          $outputJson | Out-File -FilePath $env:GITHUB_OUTPUT -Encoding utf8 -Append
          "@@@" | Out-File -FilePath $env:GITHUB_OUTPUT -Encoding utf8 -Append

      - name: Install packages
        env:
          ALL_CHANGED_PACKAGES: ${{ steps.changed-packages.outputs.data }}
        if: github.event_name != 'push'
        run: |
          $pkgs = $env:ALL_CHANGED_PACKAGES | ConvertFrom-Json
          $failed = $false
          opam update
          Foreach ($pkg in $pkgs) {
            Write-Host "::group::Testing `e[1;34m$pkg`e[0m"
            opam install --color=always --confirm-level=unsafe-yes "$pkg"
            Write-Host "::endgroup::"
            switch ($LASTEXITCODE) {
              0 { 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 "build failed"
          }
          Exit