functions/Export-DbaScript.ps1

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function Export-DbaScript {
    <#
  .SYNOPSIS
   Exports scripts from SQL Management Objects (SMO)
 
  .DESCRIPTION
   Exports scripts from SQL Management Objects
 
  .PARAMETER InputObject
   A SQL Managment Object such as the one returned from Get-DbaLogin
 
  .PARAMETER Path
   The output filename and location. If no path is specified, one will be created. If the file already exists, the output will be appended.
 
  .PARAMETER Encoding
   Specifies the file encoding. The default is UTF8.
 
   Valid values are:
   -- ASCII: Uses the encoding for the ASCII (7-bit) character set.
   -- BigEndianUnicode: Encodes in UTF-16 format using the big-endian byte order.
   -- Byte: Encodes a set of characters into a sequence of bytes.
   -- String: Uses the encoding type for a string.
   -- Unicode: Encodes in UTF-16 format using the little-endian byte order.
   -- UTF7: Encodes in UTF-7 format.
   -- UTF8: Encodes in UTF-8 format.
   -- Unknown: The encoding type is unknown or invalid. The data can be treated as binary.
 
  .PARAMETER Passthru
   Output script to console
 
  .PARAMETER ScriptingOptionsObject
   An SMO Scripting Object that can be used to customize the output - see New-DbaScriptingOption
 
  .PARAMETER WhatIf
   Shows what would happen if the command were to run. No actions are actually performed
 
  .PARAMETER NoClobber
   Do not overwrite file
 
  .PARAMETER Append
   Append to file
 
  .PARAMETER Confirm
   Prompts you for confirmation before executing any changing operations within the command
 
  .PARAMETER EnableException
   By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
   This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
   Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
    
  .NOTES
   Tags: Migration, Backup, Export
 
   Website: https://dbatools.io
   Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
   License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
  .LINK
   https://dbatools.io/Export-DbaScript
 
  .EXAMPLE
   Get-DbaAgentJob -SqlInstance sql2016 | Export-DbaScript
 
   Exports all jobs on the SQL Server sql2016 instance using a trusted connection - automatically determines filename as .\sql2016-Job-Export-date.sql
 
  .EXAMPLE
   Get-DbaAgentJob -SqlInstance sql2016 | Export-DbaScript -Path C:\temp\export.sql -Append
 
   Exports all jobs on the SQL Server sql2016 instance using a trusted connection - Will append the output to the file C:\temp\export.sql if it already exists
 
  .EXAMPLE
   Get-DbaAgentJob -SqlInstance sql2016 -Job syspolicy_purge_history, 'Hourly Log Backups' -SqlCredential (Get-Credential sqladmin) | Export-DbaScript -Path C:\temp\export.sql
 
   Exports only syspolicy_purge_history and 'Hourly Log Backups' to C:temp\export.sql and uses the SQL login "sqladmin" to login to sql2016
 
  .EXAMPLE
   Get-DbaAgentJob -SqlInstance sql2014 | Export-DbaJob -Passthru | ForEach-Object { $_.Replace('sql2014','sql2016') } | Set-Content -Path C:\temp\export.sql
 
   Exports jobs and replaces all instances of the servername "sql2014" with "sql2016" then writes to C:\temp\export.sql
 
  .EXAMPLE
   $options = New-DbaScriptingOption
   $options.ScriptDrops = $false
   $options.WithDependencies = $true
   Get-DbaAgentJob -SqlInstance sql2016 | Export-DbaScript -ScriptingOptionsObject $options
 
   Exports Agent Jobs with the Scripting Options ScriptDrops set to $false and WithDependencies set to $true.
 #>

    [CmdletBinding(SupportsShouldProcess = $true)]
    param (
        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [object[]]$InputObject,
        [Alias("ScriptingOptionObject")]
        [Microsoft.SqlServer.Management.Smo.ScriptingOptions]$ScriptingOptionsObject,
        [string]$Path,
        [ValidateSet('ASCII', 'BigEndianUnicode', 'Byte', 'String', 'Unicode', 'UTF7', 'UTF8', 'Unknown')]
        [string]$Encoding = 'UTF8',
        [switch]$Passthru,
        [switch]$NoClobber,
        [switch]$Append,
        [switch][Alias('Silent')]$EnableException
    )

    begin {
        $executingUser = [Security.Principal.WindowsIdentity]::GetCurrent().Name
        $commandName = $MyInvocation.MyCommand.Name
        $timeNow = (Get-Date -uformat "%m%d%Y%H%M%S")
        $prefixArray = @()
    }

    process {
        foreach ($object in $InputObject) {

            $typename = $object.GetType().ToString()

            if ($typename.StartsWith('Microsoft.SqlServer.')) {
                $shortype = $typename.Split(".")[-1]
            }
            else {
                Stop-Function -Message "InputObject is of type $typename which is not a SQL Management Object. Only SMO objects are supported." -Category InvalidData -Target $object -Continue
            }

            if ($shortype -in "LinkedServer", "Credential", "Login") {
                Write-Message -Level Warning -Message "Support for $shortype is limited at this time. No passwords, hashed or otherwise, will be exported if they exist."
            }

            # Just gotta add the stuff that Nic Cain added to his script

            if ($shortype -eq "Configuration") {
                Write-Message -Level Warning -Message "Support for $shortype is limited at this time."
            }

            # Find the server object to pass on to the function
            $parent = $object.parent

            do {
                if ($parent.Urn.Type -ne "Server") {
                    $parent = $parent.Parent
                }
            }
            until (($parent.Urn.Type -eq "Server") -or (-not $parent))

            if (-not $parent) {
                Stop-Function -Message "Failed to find valid SMO server object in input: $object." -Category InvalidData -Target $object -Continue
            }

            $server = $parent
            $serverName = $server.Name.Replace('\', '$')

            if ($ScriptingOptionsObject) {
                $scripter = New-Object Microsoft.SqlServer.Management.Smo.Scripter $server
                $scripter.Options = $ScriptingOptionsObject
            }

            if (!$passthru) {
                if ($path) {
                    $actualPath = $path
                }
                else {
                    $actualPath = "$serverName-$shortype-Export-$timeNow.sql"
                }
            }

            $prefix = "/*`n`tCreated by $executingUser using dbatools $commandName for objects on $serverName at $(Get-Date)`n`tSee https://dbatools.io/$commandName for more information`n*/"

            if ($passthru) {
                $prefix | Out-String
            }
            else {
                if ($prefixArray -notcontains $actualPath) {

                    if ((Test-Path -Path $actualPath) -and $NoClobber){
                        Stop-Function -Message "File already exists. If you want to overwrite it remove the -NoClobber parameter. If you want to append data, please Use -Append parameter." -Target $actualPath -Continue
                    }
                    #Only at the first output we use the passed variables Append & NoClobber. For this execution the next ones need to buse -Append
                    $prefix | Out-File -FilePath $actualPath -Encoding $encoding -Append:$Append -NoClobber:$NoClobber
                    $prefixArray += $actualPath
                }
            }

            if ($Pscmdlet.ShouldProcess($env:computername, "Exporting $object from $server to $actualPath")) {
                Write-Message -Level Verbose -Message "Exporting $object"

                if ($passthru) {
                    if ($ScriptingOptionsObject) {
                        foreach ($script in $scripter.EnumScript($object)) {
                            $script | Out-String
                        }
                    }
                    else {
                        $object.Script() | Out-String
                    }
                }
                else {
                    if ($ScriptingOptionsObject) {
                        foreach ($script in $scripter.EnumScript($object)) {
                            $script | Out-File -FilePath $actualPath -Encoding $encoding -Append
                        }
                    }
                    else {
                        $object.Script() | Out-File -FilePath $actualPath -Encoding $encoding -Append
                    }
                }
            }

            if (!$passthru) {
                Write-Message -Level Output -Message "Exported $object on $server to $actualPath"
            }
        }
    }
}