spectre.console/src/Spectre.Console/Extensions/TreeExtensions.cs

namespace Spectre.Console;

/// <summary>
/// Contains extension methods for <see cref="Tree"/>.
/// </summary>
public static class TreeExtensions
{
    /// <summary>
    /// Sets the tree style.
    /// </summary>
    /// <param name="tree">The tree.</param>
    /// <param name="style">The tree style.</param>
    /// <returns>The same instance so that multiple calls can be chained.</returns>
    public static Tree Style(this Tree tree, Style? style)
    {
        if (tree is null)
        {
            throw new ArgumentNullException(nameof(tree));
        }

        tree.Style = style;
        return tree;
    }

    /// <summary>
    /// Sets the tree guide line appearance.
    /// </summary>
    /// <param name="tree">The tree.</param>
    /// <param name="guide">The tree guide lines to use.</param>
    /// <returns>The same instance so that multiple calls can be chained.</returns>
    public static Tree Guide(this Tree tree, TreeGuide guide)
    {
        if (tree is null)
        {
            throw new ArgumentNullException(nameof(tree));
        }

        tree.Guide = guide;
        return tree;
    }
}