TeamCity: Inject github short hash to AssemblyInfo.cs files

injectGitHashToAssemblyInfo.ps1

$githubHash="%build.vcs.number%"
$gitShortHash=$githubHash.Substring(0,7)
$rootDirectory="%teamcity.build.workingDir%"

$listOfFiles = @(    
    "$rootDirectory\TestProject\Properties\AssemblyInfo.cs"
    )

foreach($file in $listOfFiles)
{    
    echo "replacing $file"
    #if the last line already includes AssemblyInformationalVersion, re-add it
    $lastLine = Get-Content $file|select-object -last 1
    echo "last line is $lastLine"
    if($lastLine.Contains("AssemblyInformationalVersion"))
    {
       #replace the existing without the last line
       $existingContent=Get-Content $file|select-object  -SkipLast 1
       $existingContent|out-file $file -encoding UTF8
    }
    echo "adding content"
    Add-Content $file "[assembly: AssemblyInformationalVersion(`"$gitShortHash`")]"
}