PowerShell Robocopy Wrapper

#
# Execute robocopy with parameters as required, proper handling of output,
# proper handling of error codes.
function Robust-Copy {
    param(
        [string]   $sourcePath = $(throw "sourcePath is required"),
        [string]   $destPath = $(throw "destPath is a required"),
        [string[]] $includeFiles = @(),
        [string[]] $excludeDirectories = $null,
        [string[]] $excludeFiles = $null,
        [string[]] $params = @(),
        [string]   $item = ""
    )
    Write-Host "Copying '$item' from '$sourcePath' to '$destPath'"

    $defaultParams = @("/MIR","/NP","/NFL","/NDL","/NJS","/NC","/NS") # Mirror and be quiet :-)

    $xdParams = @()
    if ($excludeDirectories -ne $null)
    {
        $xdParams = @("/XD")
        $xdParams += $excludeDirectories
    }

    $xfParams = @()
    if ($excludeFiles -ne $null)
    {
        $xfParams = @("/XF")
        $xfParams += $excludeFiles
    }

    & "robocopy" $robocommand $sourcePath $destPath $includeFiles $defaultParams $params $xdParams $xfParams | Out-Null
    if (($LASTEXITCODE -ge 0) -and ($LASTEXITCODE -le 3))
    {
        Write-Verbose "Robocopy success: $LASTEXITCODE"
    }
    elseif (($LASTEXITCODE -gt 0) -and ($LASTEXITCODE -lt 16))
    {
        Write-Warning "Robocopy exit code: $LASTEXITCODE"
    }
    elseif ($LASTEXITCODE -eq 16)
    {
        Write-Host "Robocopy did not copy anything."
    }
    else
    {
        Write-Warning "Robocopy unknown exit code: $LASTEXITCODE"
    }
}

#
# Example usage:
#

#
# Example 1:
Robust-Copy -sourcePath "$sourceDir" -destPath "$workingSourceDir" -excludeDirectories "bin","obj","TestResults","AppPackages","$packageDirs",".vs","artifacts" -excludeFiles "*.suo","*.user","project.json","*.lock.json" -item "source"

#
# Example 2:
foreach ($build in $builds)
{
    # TODO: Can projects and final directories be pulled out of the list of builds?
    $prjNames = $build.PrjNames
    $finalDir = $build.FinalDir

    foreach($prj in $prjNames)
    {
        Robust-Copy -sourcePath "$workingSourceDir\$prj\bin\Release\$finalDir" -destPath "$workingDir\Package\Bin\$finalDir" -includeFiles "*.dll","*.pdb","*.xml" -excludeFiles "*.CodeAnalysisLog.xml" -item "compiled binaries"
    }
}