PowerShellUtils

1.0.0

PowerShellUtils/Commands/PrintTree/PrintNodeImpl.cs

                                using System.Linq;

using System.Threading;

using PowerShellStandardModule1.Lib.Extensions;

using PowerShellStandardModule1.Models;

namespace PowerShellStandardModule1.Commands.PrintTree;

public class PrintNodeImpl(

    FileSystemInfoTreeNodeEnumerableProcessor orderer,

    int width,

    StringValueSelector stringValueSelector,

    CancellationToken token)

{

    public FileSystemInfoPrintNodeEnumerable CreatePrintNodes(FileSystemInfoTreeNode treeNode)

    {

        // tag existing tree using pre order traversal to produce padding/branch data for printing tree and produce pre order sequence

        // if user stops during bfs, do not begin traversal

        token.ThrowIfCancellationRequested();

        var root = CreateRootNode(treeNode);

        return root

           .ToPreOrderPrintNodes()

           .TapEach(_ => token.ThrowIfCancellationRequested())

            // flattened sequence represents lines of output, trim excess lines. the output should be trimmed down based on preorder rather than breadth-first ordering

           .Take(width);

    }

    private FileSystemInfoPrintNode CreateRootNode(FileSystemInfoTreeNode treeNode)

    {

        // inject projection and children ordering logic

        var root = treeNode.ToPrintNode();

        root.StringValueSelector = stringValueSelector;

        root.ChildProvider = x => x.Value.Children.Thru(orderer);

        return root;

    }

}