ArgumentsProcessing/HandleVerbosity.ps1

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function HandleVerbosity()
{
    [OutputType('System.Array')]
    [CmdletBinding()]
    param(
        [Parameter()]
        [Switch] $SuppressCliWarnings,

        [Parameter()]
        [string] $CliVerbosity,

        [Parameter()]
        [string[]] $Arguments
    )

    $additionalArguments = @()

    $verboseArgument = '--verbose'
    $debugArgument = '--debug'
    $noWarningsArgument = '--only-show-errors'

    $verbose = $VerbosePreference -ne 'SilentlyContinue'

    if ($verbose)
    {
        if (-not $CliVerbosity)
        {
            if ($SuppressCliWarnings.IsPresent)
            {
                throw "-SuppressCliWarnings cannot be used together with -Verbose"
            }

            $additionalArguments += $verboseArgument
        }
    }

    switch ($CliVerbosity)
    {
        "NoWarnings"
        {
            if ($Arguments -contains $debugArgument)
            {
                throw "-CliVerbosity ${CliVerbosity} cannot be used together with ${debugArgument}"
            }
            if ($Arguments -contains $verboseArgument)
            {
                throw "-CliVerbosity ${CliVerbosity} cannot be used together with ${verboseArgument}"
            }

            $additionalArguments += $noWarningsArgument
        }

        "Verbose"
        {
            if ($SuppressCliWarnings.IsPresent)
            {
                throw "-SuppressCliWarnings cannot be used together with -CliVerbosity Verbose"
            }
            if ($Arguments -contains $noWarningsArgument)
            {
                throw "-CliVerbosity ${CliVerbosity} cannot be used together with ${noWarningsArgument}"
            }

            $additionalArguments += $verboseArgument
        }

        "Debug"
        {
            if ($SuppressCliWarnings.IsPresent)
            {
                throw "-SuppressCliWarnings cannot be used together with -CliVerbosity Debug"
            }
            if ($Arguments -contains $noWarningsArgument)
            {
                throw "-CliVerbosity ${CliVerbosity} cannot be used together with ${noWarningsArgument}"
            }

            $additionalArguments += $debugArgument
        }
    }

    if ($SuppressCliWarnings.IsPresent)
    {
        Write-Warning "'-SuppressCliWarnings' is deprecated. Please use '-CliVerbosity NoWarnings' instead. '-SuppressCliWarnings' may be removed in a later major version upgrade."
        if ($Arguments -contains $debugArgument)
        {
            throw "-SuppressCliWarnings cannot be used together with ${debugArgument}"
        }
        if ($Arguments -contains $verboseArgument)
        {
            throw "-SuppressCliWarnings cannot be used together with ${verboseArgument}"
        }
    $additionalArguments += $noWarningsArgument
    }

    $additionalArguments
}