build: add AppVeyor integration

appveyor.yml

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+environment:
+  matrix:
+    - PYTHON: "C:\\Python27"
+      PYTHON_VERSION: "2.7.x"
+      PYTHON_ARCH: "32"
+      TOXENV: 'py27,py27-deps,py27-t3'
+
+    - PYTHON: "C:\\Python33"
+      PYTHON_VERSION: "3.3.x"
+      PYTHON_ARCH: "32"
+      TOXENV: 'py33,py33-deps,py33-t3'
+
+    - PYTHON: "C:\\Python34"
+      PYTHON_VERSION: "3.4.x"
+      PYTHON_ARCH: "32"
+      TOXENV: 'py34,py34-deps,py34-t3'
+
+    - PYTHON: "C:\\Python35"
+      PYTHON_VERSION: "3.5.x"
+      PYTHON_ARCH: "32"
+      TOXENV: 'py35,py35-deps'
+
+install:
+  # Install Python (from the official .msi of http://python.org) and pip when
+  # not already installed.
+  - ps: if (-not(Test-Path($env:PYTHON))) { & appveyor\install.ps1 }
+
+  # Prepend newly installed Python to the PATH of this build (this cannot be
+  # done from inside the powershell script as it would require to restart
+  # the parent CMD process).
+  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
+
+  # Check that we have the expected version and architecture for Python
+  - "python --version"
+  - "python -c \"import struct; print(struct.calcsize('P') * 8)\""
+
+  # Upgrade to the latest version of pip
+  - "pip install --disable-pip-version-check --user --upgrade pip"
+
+  # Install tox
+  - pip install tox
+
+build: false  # Not a C# project, build stuff at the test step instead.
+
+test_script:
+  - tox

appveyor/install.ps1

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+# Sample script to install Python and pip under Windows
+# Authors: Olivier Grisel, Jonathan Helmus and Kyle Kastner
+# License: CC0 1.0 Universal: http://creativecommons.org/publicdomain/zero/1.0/
+
+$MINICONDA_URL = "http://repo.continuum.io/miniconda/"
+$BASE_URL = "https://www.python.org/ftp/python/"
+$GET_PIP_URL = "https://bootstrap.pypa.io/get-pip.py"
+$GET_PIP_PATH = "C:\get-pip.py"
+
+
+function Download ($filename, $url) {
+    $webclient = New-Object System.Net.WebClient
+
+    $basedir = $pwd.Path + "\"
+    $filepath = $basedir + $filename
+    if (Test-Path $filename) {
+        Write-Host "Reusing" $filepath
+        return $filepath
+    }
+
+    # Download and retry up to 3 times in case of network transient errors.
+    Write-Host "Downloading" $filename "from" $url
+    $retry_attempts = 2
+    for($i=0; $i -lt $retry_attempts; $i++){
+        try {
+            $webclient.DownloadFile($url, $filepath)
+            break
+        }
+        Catch [Exception]{
+            Start-Sleep 1
+        }
+    }
+    if (Test-Path $filepath) {
+        Write-Host "File saved at" $filepath
+    } else {
+        # Retry once to get the error message if any at the last try
+        $webclient.DownloadFile($url, $filepath)
+    }
+    return $filepath
+}
+
+
+function DownloadPython ($python_version, $platform_suffix) {
+    $version_obj = [version]$python_version
+    if ($version_obj -lt [version]'3.3.0' -and $version_obj.Build -eq 0) {
+        $python_version = "$($version_obj.Major).$($version_obj.Minor)"
+    }
+    $filename = "python-" + $python_version + $platform_suffix + ".msi"
+    $url = $BASE_URL + $python_version + "/" + $filename
+    $filepath = Download $filename $url
+    return $filepath
+}
+
+
+function InstallPython ($python_version, $architecture, $python_home) {
+    Write-Host "Installing Python" $python_version "for" $architecture "bit architecture to" $python_home
+    if (Test-Path $python_home) {
+        Write-Host $python_home "already exists, skipping."
+        return $false
+    }
+    if ($architecture -eq "32") {
+        $platform_suffix = ""
+    } else {
+        $platform_suffix = ".amd64"
+    }
+    $msipath = DownloadPython $python_version $platform_suffix
+    Write-Host "Installing" $msipath "to" $python_home
+    $install_log = $python_home + ".log"
+    $install_args = "/qn /log $install_log /i $msipath TARGETDIR=$python_home"
+    $uninstall_args = "/qn /x $msipath"
+    RunCommand "msiexec.exe" $install_args
+    if (-not(Test-Path $python_home)) {
+        Write-Host "Python seems to be installed else-where, reinstalling."
+        RunCommand "msiexec.exe" $uninstall_args
+        RunCommand "msiexec.exe" $install_args
+    }
+    if (Test-Path $python_home) {
+        Write-Host "Python $python_version ($architecture) installation complete"
+    } else {
+        Write-Host "Failed to install Python in $python_home"
+        Get-Content -Path $install_log
+        Exit 1
+    }
+}
+
+function RunCommand ($command, $command_args) {
+    Write-Host $command $command_args
+    Start-Process -FilePath $command -ArgumentList $command_args -Wait -Passthru
+}
+
+
+function InstallPip ($python_home) {
+    $pip_path = $python_home + "\Scripts\pip.exe"
+    $python_path = $python_home + "\python.exe"
+    if (-not(Test-Path $pip_path)) {
+        Write-Host "Installing pip..."
+        $webclient = New-Object System.Net.WebClient
+        $webclient.DownloadFile($GET_PIP_URL, $GET_PIP_PATH)
+        Write-Host "Executing:" $python_path $GET_PIP_PATH
+        Start-Process -FilePath "$python_path" -ArgumentList "$GET_PIP_PATH" -Wait -Passthru
+    } else {
+        Write-Host "pip already installed."
+    }
+}
+
+
+function main () {
+    InstallPython $env:PYTHON_VERSION $env:PYTHON_ARCH $env:PYTHON
+    InstallPip $env:PYTHON
+}
+
+main