Utils.cs

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using System.IO;
using System.Linq;
using System.Net;

namespace CodeGen.utils
{
    public static class Utils
    {
        public static string Read(string name)
        {
            if (File.Exists(name))
            {
                return File.ReadAllText(name);
            }

            throw new FileNotFoundException("file does not exit");
        }

        public static void Write(string path, string fileContext)
        {
            File.WriteAllText(path, fileContext);
        }

        public static string Download(string url)
        {
            var webClient = new WebClient();
            return webClient.DownloadString(url);
        }

        public static void ValidateArgs(string lang, string file)
        {
            if (lang == "")
            {
                throw new InvalidDataException("specify language (-l) flag");
            }

            if (file == "")
            {
                throw new InvalidDataException("specify file path (-f) flag");
            }
        }

        public static string GetFileFormat(string name)
        {
            var arr = name.Split('.');
            if (!(arr?.Length > 1)) throw new InvalidDataException("invalid input file");
            if (arr.Last().Any(char.IsLetter))
            {
                return arr.Last();
            }

            throw new InvalidDataException("invalid input file");
        }

        public static string Title(string @string)
        {
            return string.IsNullOrEmpty(@string)
                ? @string
                : (
                    @string.Length > 1 
                        ? char.ToUpper(@string[0]) + @string.Substring(1) 
                        : @string.ToUpper()
                );
        }
    }
}