Function Update-FunctionNamesInPSD1 {
<#
.SYNOPSIS
    Concatenates all the function names from Get-FunctionNames for insertion into the PSD1 file referenced.

.EXAMPLE
    Update-FunctionNamesInPSD1 .\Alkami.PowerShell.IIS\Public .\Alkami.PowerShell.IIS\Alkami.PowerShell.IIS.psd1

.PARAMETER FolderPath
    The name of the folder to examine all files under.

.PARAMETER Psd1FilePath
    The file to be rewritten. (This is called out in case more than one .psd1 file exists in a folder.)
#>
    [CmdletBinding()]
    Param (
        [String]$FolderPath,
        [String]$Psd1FilePath
    )
    process {
        $functionNames = @(Get-FunctionNames $FolderPath) | Sort-Object

        $toBeJoinedFunctionNames = @()

        foreach($name in $functionNames) {
            $toBeJoinedFunctionNames += "'$name'"
        }

        $joinedFunctionNames = $toBeJoinedFunctionNames -Join ','

        $contents = (Get-Content $Psd1FilePath)
        $newContents = @()

        foreach($line in $contents) {
            if ($line.Trim().StartsWith("FunctionsToExport")) {
                $splits = $line -split '='
                $line = $splits[0].TrimEnd() + " = $joinedFunctionNames"
            }
            $newContents += $line
        }
        Set-Content -Path $Psd1FilePath -Value $newContents
    }
}