Hastlayer-SDK

using System.Diagnostics.CodeAnalysis;
using System.Linq;

namespace System
{
    public static class StringExtensions
    {
        /// <summary>
        /// Turns a camelCase or PascalCase token into snake_Case.
        /// </summary>
        /// <param name="input">The input in camelCase or PascalCase.</param>
        /// <returns>
        /// The input converted to snake_Case. It doesn't alter case so you can call either ToUpper or ToLower without
        /// any additional penalties.
        /// </returns>
        /// <remarks><para><see href="https://stackoverflow.com/a/18781533"/>.</para></remarks>
        public static string ToSnakeCase(this string input) =>
            string.Concat(input.Select((x, i) => i > 0 && char.IsUpper(x) ? "_" + x : x.ToString()));

        /// <summary>
        /// Returns <paramref name="text"/> if it's not <see langword="null"/>, empty or whitespace. Otherwise returns
        /// <paramref name="alternative"/>.
        /// </summary>
        public static string OrIfEmpty(this string text, string alternative) =>
            string.IsNullOrWhiteSpace(text) ? alternative : text;

        /// <summary>
        /// Returns <see langword="true"/> if the value is <see langword="true"/> or <c>True</c>.
        /// </summary>
        [SuppressMessage("Minor Code Smell", "S4225:Extension methods should not extend \"object\"", Justification = "No.")]
        public static bool IsTrueString(this object value) => value?.ToString() == bool.TrueString;
    }
}