C# Ellipsis

EllipsisNumericFormattable.cs

public readonly struct EllipsisNumericFormattable<T> : IFormattable where T : struct, IFormattable
{
    private readonly T _value;
    private readonly int _width;
    private readonly char _paddingChar;

    public EllipsisNumericFormattable(T value, int width, char paddingChar)
    {
        _value = value;
        _width = width;
        _paddingChar = paddingChar;
    }

    public string ToString(string? format, IFormatProvider? formatProvider)
    {
        // Apply numeric formatting first (e.g., format “C”)
        string formatted = _value.ToString(format, formatProvider) ?? "";

        // Then apply Ellipsis padding
        return formatted.Ellipsis(_width, _paddingChar);
    }

    public override string ToString()
        => ToString(null, null);
}

GenericExtensions.cs

public static class GenericExtensions
{
    public static string Ellipsis<T>(this T sender, int width, char paddingChar = '.') where T : INumber<T>
        => sender.ToString().Ellipsis(width, paddingChar);
        
    public static string Ellipsis<T>(this T? sender, int width, char paddingChar = '.') where T : struct
        => sender is not null ? 
            sender.ToString().Ellipsis(width, paddingChar) : 
            "".Ellipsis(width, paddingChar);

    public static IFormattable EllipsisFormattable<T>(this T sender, int width, char paddingChar = '.')
        where T : struct, IFormattable
        => new EllipsisNumericFormattable<T>(sender, width, paddingChar);

}

Program.cs

using Spectre.Console;
using SamplesApp.Classes.Extensions;

namespace SamplesApp;

internal partial class Program
{
    static void Main(string[] args)
    {
        var products = MockedData.CreateProducts();
        foreach (var p in products)
        {
            if (p.Price < 50)
            {
                AnsiConsole.MarkupLine($"[green]{p.Name.Ellipsis(15)}[/][yellow]{p.Price.EllipsisFormattable(15):C}on sale[/]");
            }
            else
            {
                AnsiConsole.MarkupLine($"[green]{p.Name.Ellipsis(15)}[/][cyan]{p.Price.EllipsisFormattable(15):C}not on sale[/]");
            }
        }

    }
    
}

public class Product
{
    public int Id { get; set; }
    public required string Name { get; set; }
    public decimal Price { get; set; }
}

public class MockedData
{
    public static List<Product> CreateProducts()
        =>
        [
            new Product { Id = 1, Name = "Laptop", Price = 999.99m },
            new Product { Id = 2, Name = "Keyboard", Price = 49.50m },
            new Product { Id = 3, Name = "Mouse", Price = 29.99m },
            new Product { Id = 4, Name = "Monitor", Price = 199.00m },
            new Product { Id = 5, Name = "Headphones", Price = 89.75m }
        ];

}

StringExtensions.cs

public static class StringExtensions
{
    public static string Ellipsis(this string? sender, int width, char paddingChar = '.') 
        => sender.PadRight(width, paddingChar);
}