BuildFunctions.psm1

function Get-Version
{
  param
  (
    [string]$assemblyInfoFilePath
  )
  Write-Host "path $assemblyInfoFilePath"
  $pattern = '(?<=^\[assembly\: AssemblyVersion\(\")(?<versionString>\d+\.\d+\.\d+\.\d+)(?=\"\))'
  $assmblyInfoContent = Get-Content $assemblyInfoFilePath
  return $assmblyInfoContent | Select-String -Pattern $pattern | Select -expand Matches |% {$_.Groups['versionString'].Value}
}

function Update-Version
{
  param 
    (
    [string]$version,
    [string]$assemblyInfoFilePath
  )
  
  $newVersion = 'AssemblyVersion("' + $version + '")';
  $newFileVersion = 'AssemblyFileVersion("' + $version + '")';
  $tmpFile = $assemblyInfoFilePath + ".tmp"

  Get-Content $assemblyInfoFilePath | 
    %{$_ -replace 'AssemblyFileVersion\("[0-9]+(\.([0-9]+|\*)){1,3}"\)', $newFileVersion }  | Out-File -Encoding UTF8 $tmpFile

  Move-Item $tmpFile $assemblyInfoFilePath -force
}