environment:
  matrix:
    # Unit and integration tests.
    - PYTHON: "C:\\Python27"
      RUN_INTEGRATION_TESTS: "True"
    - PYTHON: "C:\\Python36-x64"
      RUN_INTEGRATION_TESTS: "True"
    # Unit tests only.
    - PYTHON: "C:\\Python27-x64"
    - PYTHON: "C:\\Python34"
    - PYTHON: "C:\\Python34-x64"
    - PYTHON: "C:\\Python35"
    - PYTHON: "C:\\Python35-x64"
    - PYTHON: "C:\\Python36"

matrix:
    fast_finish: true

clone_depth: 50

install:
  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
  - "python --version"
  - "python -m pip install --upgrade --disable-pip-version-check pip setuptools wheel"
  - "pip install --upgrade certifi tox tox-venv"
  - "pip freeze --all"
  # Fix git SSL errors.
  - "python -m certifi >cacert.txt"
  - "set /p GIT_SSL_CAINFO=<cacert.txt"
  - "set GIT_SSL_CAINFO"

build: off

cache:
  - '%LOCALAPPDATA%\pip\Cache'

test_script:
    - ps: |
        $ErrorActionPreference = "Stop"

        function should_run_tests {
            if ("$env:APPVEYOR_PULL_REQUEST_NUMBER" -eq "") {
                Write-Host "Not a pull request - running tests"
                return $true
            }
            Write-Host "Pull request $env:APPVEYOR_PULL_REQUEST_NUMBER based on branch $env:APPVEYOR_REPO_BRANCH"
            git fetch -q origin +refs/heads/$env:APPVEYOR_REPO_BRANCH
            $changes = (git diff --name-only HEAD (git merge-base HEAD FETCH_HEAD))
            Write-Host "Files changed:"
            Write-Host $changes
            $important = $changes | Where-Object { $_ -NotLike "*.rst" } |
                                    Where-Object { $_ -NotLike "docs*" } |
                                    Where-Object { $_ -NotLike "news*" } |
                                    Where-Object { $_ -NotLike "*travis*" } |
                                    Where-Object { $_ -NotLike ".github*" }
            if (!$important) {
                Write-Host "Only documentation changes - skipping tests"
                return $false
            }

            Write-Host "Pull request $env:APPVEYOR_PULL_REQUEST_NUMBER alters code - running tests"
            return $true
        }

        if (should_run_tests) {
            # Shorten paths, workaround https://bugs.python.org/issue18199
            subst T: $env:TEMP
            $env:TEMP = "T:\"
            $env:TMP = "T:\"
            tox -e py -- -m unit
            if ($LastExitCode -eq 0 -and $env:RUN_INTEGRATION_TESTS -eq "True") {
                tox -e py -- --use-venv -m integration -n2 --durations=20
            }
        }
