SplatHelper

0.1

SplatHelper.psm1

function ConvertTo-Splatting {
    <#
    Converts a single statement, with named parameters
    #>
    [CmdletBinding()]
    param (
        [Parameter(ValueFromPipeline = $true, Position = 0, Mandatory = $true)]
        [string] $Command
    )

    $sb = [scriptblock]::Create($Command);
    $elements = $sb.Ast.EndBlock.Statements[0].PipelineElements[0].CommandElements;

    ### If there aren't any command elements, then skip
    ### This is just a safeguard
    if (!$elements) {
        Write-Warning -Message 'No command elements found';
        return
    }

    $SplattingString = '$Params = @{{{0}' -f "`n";

    foreach ($Element in $elements) {
        if ($Element -is [System.Management.Automation.Language.CommandParameterAst]) {
            $ParameterName = $Element.ParameterName;
            $Value = $elements[$elements.IndexOf($Element) + 1];
            
            switch ($Value.GetType().Name) {
                { $PSItem -in @('StringConstantExpressionAst', 'ArrayLiteralAst') } {
                    if ($Value.StringConstantType -eq 'SingleQuoted') {
                        $SplattingString += ' {0} = {1};{2}' -f $ParameterName, $Value.Extent.Text, "`n";
                    } else {
                        $SplattingString += ' {0} = ''{1}'';{2}' -f $ParameterName, $Value.Extent.Text, "`n";
                    }
                    break;
                }
                { $PSItem -in @('VariableExpressionAst', 'ParenExpressionAst') } {
                    $SplattingString += ' {0} = {1};{2}' -f $ParameterName, $Value.Extent.Text, "`n";
                    break;
                }
                { $PSItem -in @('HashTableAst') } {
                    $SplattingString += ' {0} = @{{{1}' -f $ParameterName, "`n";
                    foreach ($Pair in $Value.KeyValuePairs) {
                        $SplattingString += ' {0} = {1};{2}' -f $Pair.Item1, $Pair.Item2, "`n";
                    }
                    $SplattingString += ' }}{0}' -f "`n";
                }
            }
        }
    }
    $SplattingString += ' }}{0}' -f "`n";
    $SplattingString += '{0} @Params' -f $elements[0].Extent.Text;
    Write-Output -InputObject $SplattingString;
}
 
function Convert-ISELineToSplatting {
    <#
    .Synopsis
    Converts the current line in PowerShell ISE to a Splatting call
    #>
    [CmdletBinding()]
    param ()

    $File = $psISE.CurrentFile.Editor.Text.Split("`n");
    $Result = ConvertTo-Splatting -Command $psISE.CurrentFile.Editor.CaretLineText;
    
    if (!$Result) { Write-Warning -Message 'No changes were made'; return; }
    $File[$psISE.CurrentFile.Editor.CaretLine-1] = $Result;
    $File = $File -join "`n";
    $psISE.CurrentFile.Editor.Text = $File;
}
 
New-Alias -Name splat -Value ConvertTo-Splatting -Force;
New-Alias -Name splatise -Value Convert-ISELineToSplatting -Force;