Restore-Items.ps1

function Restore-Items
{
    <#
        .Synopsis
        Restore working tree files
 
        .Description
        Updates files in the working tree to match the version in the specified tree.
 
        .Parameter Repository
        Path to the git repository. Can be relative or absolute. If not specified defaults to the current directory
 
        .Parameter Files
        Working files to restore.
 
        .Parameter Force
        When checking out paths from the index, do not fail upon unmerged entries; instead, unmerged entries are ignored.
 
        .Link
        https://git-scm.com/docs/git-checkout
    #>

    param(
        [Parameter(Mandatory=$False,Position=1,ValueFromPipeline=$True)]
        [string]$Repository = ".\",
        [Parameter(Mandatory=$True)]
        [string[]]$Files,
        [Alias("f")]
        [switch]$Force = $False
    )
    process
    {
        $Repository = Resolve-Path -Path $Repository
        Write-Verbose "Checking out files $Files in $Repository"
        $ExtendedCLI = "";
        if ($Force)
        {
            $ExtendedCLI += " -f"
        }
        $Output = (Invoke-Expression -Command "git -C $Repository checkout$ExtendedCLI $Files") 2>&1
        if (($Output -eq $null) -or ($Output.GetType().Name -eq "ErrorRecord"))
        {
            Write-Error -Message ($Output.Exception.Message) -CategoryActivity ($Output.Exception.Message.SubString(0, $Output.Exception.Message.IndexOf(":"))) -ErrorId $LASTEXITCODE
        }
    }
}