functions/Get-DbaConfig.ps1

function Get-DbaConfig {
    <#
        .SYNOPSIS
            Retrieves configuration elements by name.
 
        .DESCRIPTION
            Retrieves configuration elements by name.
            Can be used to search the existing configuration list.
 
        .PARAMETER FullName
            Default: "*"
            Search for configurations using the full name
 
        .PARAMETER Name
            Default: "*"
            The name of the configuration element(s) to retrieve.
            May be any string, supports wildcards.
 
        .PARAMETER Module
            Default: "*"
            Search configuration by module.
 
        .PARAMETER Force
            Overrides the default behavior and also displays hidden configuration values.
 
        .EXAMPLE
            PS C:\> Get-DbaConfig 'Mail.To'
 
            Retrieves the configuration element for the key "Mail.To"
 
        .EXAMPLE
            PS C:\> Get-DbaConfig -Force
 
            Retrieve all configuration elements from all modules, even hidden ones.
 
        .NOTES
            Author: Friedrich Weinmann
            Tags: Config
    #>

    [CmdletBinding(DefaultParameterSetName = "FullName")]
    Param (
        [Parameter(ParameterSetName = "FullName", Position = 0)]
        [string]
        $FullName = "*",

        [Parameter(ParameterSetName = "Module", Position = 1)]
        [string]
        $Name = "*",

        [Parameter(ParameterSetName = "Module", Position = 0)]
        [string]
        $Module = "*",

        [switch]
        $Force
    )

    switch ($PSCmdlet.ParameterSetName) {
        "Module" {
            $Name = $Name.ToLower()
            $Module = $Module.ToLower()

            [Sqlcollaborative.Dbatools.Configuration.ConfigurationHost]::Configurations.Values | Where-Object { ($_.Name -like $Name) -and ($_.Module -like $Module) -and ((-not $_.Hidden) -or ($Force)) } | Sort-Object Module, Name
        }

        "FullName" {
            [Sqlcollaborative.Dbatools.Configuration.ConfigurationHost]::Configurations.Values | Where-Object { ("$($_.Module).$($_.Name)" -like $FullName) -and ((-not $_.Hidden) -or ($Force)) } | Sort-Object Module, Name
        }
    }
}