public/Remove-PackageSource.ps1

function Remove-PackageSource {
    param (
        [Parameter(Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        [string]
        $Name
    )

    Write-Debug ('Remove-PackageSource')

    [array]$RegisteredPackageSources = Get-PackageSources

    # Choco.exe will not error if the specified source name isn't already registered, so we will do it here instead.
    if (-not ($RegisteredPackageSources.Name -eq $Name)) {
        ThrowError -ExceptionName "System.ArgumentException" `
            -ExceptionMessage ($LocalizedData.PackageSourceNotFound -f $Name) `
            -ErrorId 'PackageSourceNotFound' `
            -ErrorCategory InvalidArgument
    }

    # Choco will throw an exception if unregistration fails
    Unregister-ChocoSource -Name $Name
}