Show the hierarchy of sass file imports

ShowSassTree.ps1

param([string][parameter(mandatory)]$ParentFile, [string][parameter(mandatory)]$RootFile, [int][parameter(mandatory)]$Depth, [string][parameter(mandatory)]$IncludePath, [switch]$RenderDotFormat, [switch]$DoNotRecurse)

function RenderImports([string][parameter(mandatory)]$ParentFile, [string][parameter(mandatory)]$RootFile, [int][parameter(mandatory)]$Depth, [string][parameter(mandatory)]$IncludePath, [switch]$RenderDotFormat, [switch]$DoNotRecurse)
{
    $ErrorActionPreference = 'Stop'

    function GetRelativePath([string][parameter(mandatory)]$ParentFile, [string][parameter(mandatory)]$RootFile)
    {
        pushd (Split-Path -Parent $ParentFile)
        try {
            (Resolve-Path -Relative $RootFile) -replace '^\.\\', ''
        }
        finally {
            popd
        }
    }

    function EscapeDotCharacters([string][parameter(mandatory)]$value) 
    {
        return $value -replace '\\', '\\'
    }

    if($RenderDotFormat) {
        if($Depth -eq 0) {
            echo "digraph g{"
        }
        $left = EscapeDotCharacters $ParentFile
        $right = EscapeDotCharacters $RootFile
        echo "`"$left`" -> `"$right`";"
    }
    else {
        $indent = New-Object System.String ' ', ($Depth * 4)
        $relativePath = GetRelativePath $ParentFile (Resolve-Path $RootFile)
        echo "$indent $relativePath"
    }

    if(!$DoNotRecurse) {
        cat $RootFile | % { 
            if($_ -match '^\s*@import\s*"([^"]+)"') {
                $file = $Matches[1]
                $leaf = Split-Path -Leaf $file
                $parent = Split-Path -Parent $file
                $rootDir = Split-Path -Parent $RootFile
                $path = Join-Path $rootDir "$parent\_$leaf.scss"

                if((Test-Path $path)) {
                    RenderImports $RootFile $path ($Depth + 1) $IncludePath -RenderDotFormat:$RenderDotFormat
                }
                else {
                    $path = Join-Path $IncludePath "$parent\_$leaf.scss"

                    if(!(Test-Path $path)) {
                        throw "Unable to find import: $file."
                    }
                    RenderImports $RootFile $path ($Depth + 1) $IncludePath -RenderDotFormat:$RenderDotFormat -DoNotRecurse
                }
            }
        }
    }

    if($RenderDotFormat) {
        if($Depth -eq 0) {
            echo "}"
        }
    }
}

RenderImports $ParentFile $RootFile $Depth $IncludePath -RenderDotFormat:$RenderDotFormat -DoNotRecurse:$DoNotRecurse