PathHelper.cs

using System;
using System.Globalization;
using System.IO;

namespace XCom2ModTool
{
    internal class PathHelper
    {
        public static bool IsAbsolute(string path)
        {
            return Path.IsPathRooted(path);
        }

        public static bool IsRelative(string path)
        {
            return !IsAbsolute(path);
        }

        public static string MakeAbsolute(string path)
        {
            return Path.GetFullPath(path);
        }

        public static string MakeAbsolute(string path, string parentFolderPath)
        {
            if (IsAbsolute(path))
            {
                return path;
            }

            return MakeAbsolute(Path.Combine(parentFolderPath, path));
        }

        public static string MakeRelative(string path, string parentFolderPath)
        {
            if (IsRelative(path))
            {
                throw new ArgumentException($"{nameof(path)} is a relative path");
            }
            if (IsRelative(parentFolderPath))
            {
                throw new ArgumentException($"{nameof(parentFolderPath)} is a relative path");
            }

            var pathUri = new Uri(path);
            if (!parentFolderPath.EndsWith(Path.DirectorySeparatorChar.ToString(CultureInfo.InvariantCulture)))
            {
                parentFolderPath += Path.DirectorySeparatorChar;
            }
            var folderUri = new Uri(parentFolderPath);
            return Uri.UnescapeDataString(folderUri.MakeRelativeUri(pathUri).ToString().Replace('/', Path.DirectorySeparatorChar));
        }

        public static string EscapeAndJoinArguments(string[] args)
        {
            var newArgs = new string[args.Length];
            for (var i = 0; i < args.Length; ++i)
            {
                var arg = args[i];
                var containsQuotes = arg.IndexOf("\"", 0, StringComparison.Ordinal) > 0;
                var containsSpaces = arg.IndexOf(" ", 0, StringComparison.Ordinal) > 0;
                if (containsQuotes)
                {
                    arg = arg.Replace("\"", "\"\"");
                }
                if (containsQuotes || containsSpaces)
                {
                    arg = $"\"{arg}\"";
                }
                newArgs[i] = arg;
            }
            return string.Join(" ", newArgs);
        }
    }
}