spectre.console/src/Spectre.Console/Rendering/Tree/LineTreeGuide.cs

using System;

namespace Spectre.Console.Rendering;

/// <summary>
/// A tree guide made up of lines.
/// </summary>
public sealed class LineTreeGuide : TreeGuide
{
    /// <inheritdoc/>
    public override string GetPart(TreeGuidePart part)
    {
        return part switch
        {
            TreeGuidePart.Space => "    ",
            TreeGuidePart.Continue => "│   ",
            TreeGuidePart.Fork => "├── ",
            TreeGuidePart.End => "└── ",
            _ => throw new ArgumentOutOfRangeException(nameof(part), part, "Unknown tree part."),
        };
    }
}