appveyor.install.ps1

# Regular expression for matching semantic versioning (http://semver.org/)
$regex = "^v(?<version>(?<major>\d+)\.(?<minor>\d+)\.(?<revision>\d+))(?<prerelease>(?:\-[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?)(?<metadata>(?:\+[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*?)?)$"

If ($env:APPVEYOR_REPO_BRANCH -match $regex)
{
  # Branch name consists of a 'v' followed by a valid semantic version string
  
  # Treat this as a versioned deploy (possibly a prerelease version)
  $env:DEPLOY_NUGET = $true
  Write-Host "Preparing to deploy to NuGet..."

  # Only update assembly version on breaking changes (major version increments)
  $env:ASSEMBLY_VERSION = $matches['major'] + ".0.0"
  # File version includes NuGet release number plus build number
  $env:ASSEMBLY_FILE_VERSION = $matches['version'] + "." + $env:APPVEYOR_BUILD_NUMBER
  # NuGet doesn't allow any build metadata (+) or dots in prerelease tags (-)
  $env:ASSEMBLY_INFORMATIONAL_VERSION = $matches['version'] + ($matches['prerelease'] -replace "\.", "")
}
Else
{
  # Do not assign a release number or deploy to NuGet
  $env:DEPLOY_NUGET = $false
  
  $env:ASSEMBLY_VERSION = "0.0.0"
  $env:ASSEMBLY_FILE_VERSION = "0.0.0." + $env:APPVEYOR_BUILD_NUMBER
  $env:ASSEMBLY_INFORMATIONAL_VERSION = "0.0.0-" + ($env:APPVEYOR_REPO_BRANCH -replace "[^0-9A-Za-z]", "") + "-" + $env:APPVEYOR_BUILD_NUMBER
}

Write-Host "  Assembly version" $env:ASSEMBLY_VERSION
Write-Host "  Assembly file version" $env:ASSEMBLY_FILE_VERSION
Write-Host "  Assembly informational version" $env:ASSEMBLY_INFORMATIONAL_VERSION

# Set release notes for NuGet package
$env:releaseNotes = $env:APPVEYOR_REPO_COMMIT_MESSAGE