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

namespace Spectre.Console;

/// <summary>
/// Contains extension methods for <see cref="RuleExtensions"/>.
/// </summary>
public static class RuleExtensions
{
    /// <summary>
    /// Sets the rule title.
    /// </summary>
    /// <param name="rule">The rule.</param>
    /// <param name="title">The title.</param>
    /// <returns>The same instance so that multiple calls can be chained.</returns>
    public static Rule RuleTitle(this Rule rule, string title)
    {
        if (rule is null)
        {
            throw new ArgumentNullException(nameof(rule));
        }

        if (title is null)
        {
            throw new ArgumentNullException(nameof(title));
        }

        rule.Title = title;
        return rule;
    }

    /// <summary>
    /// Sets the rule style.
    /// </summary>
    /// <param name="rule">The rule.</param>
    /// <param name="style">The rule style.</param>
    /// <returns>The same instance so that multiple calls can be chained.</returns>
    public static Rule RuleStyle(this Rule rule, Style style)
    {
        if (rule is null)
        {
            throw new ArgumentNullException(nameof(rule));
        }

        if (style is null)
        {
            throw new ArgumentNullException(nameof(style));
        }

        rule.Style = style;
        return rule;
    }
}