LogViewer.FileUtil.ShortenPathname C# (CSharp) Method

        public static string ShortenPathname(string pathname, int maxLength)
        {
            if (pathname.Length <= maxLength)
                return pathname;

            string root = Path.GetPathRoot(pathname);
            if (root.Length > 3)
                root += Path.DirectorySeparatorChar;

            string[] elements = pathname.Substring(root.Length).Split(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);

            int filenameIndex = elements.GetLength(0) - 1;

            if (elements.GetLength(0) == 1) // pathname is just a root and filename
            {
                if (elements[0].Length > 5) // long enough to shorten
                {
                    // if path is a UNC path, root may be rather long
                    if (root.Length + 6 >= maxLength)
                    {
                        return root + elements[0].Substring(0, 3) + "...";
                    }
                    else
                    {
                        return pathname.Substring(0, maxLength - 3) + "...";
                    }
                }
            }
            else if ((root.Length + 4 + elements[filenameIndex].Length) > maxLength) // pathname is just a root and filename
            {
                root += "...\\";

                int len = elements[filenameIndex].Length;
                if (len < 6)
                    return root + elements[filenameIndex];

                if ((root.Length + 6) >= maxLength)
                {
                    len = 3;
                }
                else
                {
                    len = maxLength - root.Length - 3;
                }
                return root + elements[filenameIndex].Substring(0, len) + "...";
            }
            else if (elements.GetLength(0) == 2)
            {
                return root + "...\\" + elements[1];
            }
            else
            {
                int len = 0;
                int begin = 0;

                for (int i = 0; i < filenameIndex; i++)
                {
                    if (elements[i].Length > len)
                    {
                        begin = i;
                        len = elements[i].Length;
                    }
                }

                int totalLength = pathname.Length - len + 3;
                int end = begin + 1;

                while (totalLength > maxLength)
                {
                    if (begin > 0)
                        totalLength -= elements[--begin].Length - 1;

                    if (totalLength <= maxLength)
                        break;

                    if (end < filenameIndex)
                        totalLength -= elements[++end].Length - 1;

                    if (begin == 0 && end == filenameIndex)
                        break;
                }

                // assemble final string

                for (int i = 0; i < begin; i++)
                {
                    root += elements[i] + '\\';
                }

                root += "...\\";

                for (int i = end; i < filenameIndex; i++)
                {
                    root += elements[i] + '\\';
                }

                return root + elements[filenameIndex];
            }
            return pathname;
        }