MarkdownTOC

using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace VII_2656.TOC
{
    public static class MarkdownTOC
    {
        private static readonly string _pattern = @"^(#{1,6}.*)"; // @"(\#+\s\w+).*$"
        private static Regex _regex;
        private static MatchCollection _matchCollection;
        private static int _start;
        private static string _markdownTOC;
        private static string _markdownWithIdentifiers;
        private static string _markdownSub;
        private static readonly string _pathMD = @"E:\Nazca\VII-2656\VII-2656\MD\Variable.pl.md";
        private static readonly string _pathSave = @"E:\Nazca\VII-2656\VII-2656\MD\Markdown_R.md";

        public static string GetMarkdownTOC()
        {
            return _markdownTOC;
        }

        public static string GetMarkdownWithIdentifiers()
        {
            return _markdownWithIdentifiers;
        }

        public static string GetMarkdownSub()
        {
            return _markdownSub;
        }

        public static void SaveMarkdownToFile()
        {
            File.WriteAllText(_pathSave, _markdownSub, Encoding.UTF8);
        }

        public static string GenerateMarkdownIdentifiers()
        {
            var stringFromFile = File.ReadAllText(_pathMD);
            _regex = new Regex(_pattern, RegexOptions.Multiline);
            _matchCollection = _regex.Matches(stringFromFile);
            foreach (var match in _matchCollection)
            {
                _start = stringFromFile.IndexOf(match.ToString()) + match.ToString().Length - 1;
                var stringBuilder = new StringBuilder(match.ToString());
                stringBuilder.Replace("#", "");
                stringBuilder.Replace("ą", "a");
                stringBuilder.Replace("ć", "c");
                stringBuilder.Replace("ę", "e");
                stringBuilder.Replace("ł", "l");
                stringBuilder.Replace("ń", "n");
                stringBuilder.Replace("ó", "o");
                stringBuilder.Replace("ś", "s");
                stringBuilder.Replace("ź", "z");
                stringBuilder.Replace("ż", "z");
                stringBuilder.Remove(0, 1);
                stringBuilder.Remove(stringBuilder.ToString().Length - 1, 1);
                stringFromFile
                    = stringFromFile
                        .Insert(_start, " <a name="
                                        + @""
                                        + stringBuilder
                                            .ToString()
                                            .ToLower()
                                            .Replace(" ", "_")
                                            .Trim()
                                        + @""
                                        + "></a>");
            }

            _markdownWithIdentifiers = stringFromFile;
            return _markdownWithIdentifiers;
        }

        public static string GenerateMarkdownTOC()
        {
            var stringFromFile = File.ReadAllText(_pathMD);
            _regex = new Regex(_pattern, RegexOptions.Multiline);
            _matchCollection = _regex.Matches(stringFromFile);
            foreach (var match in _matchCollection)
            {
                _start = stringFromFile.IndexOf(match.ToString()) + match.ToString().Length - 1;
                var stringBuilder = new StringBuilder(match.ToString());
                stringBuilder.Replace("#", "");
                stringBuilder.Replace("ą", "a");
                stringBuilder.Replace("ć", "c");
                stringBuilder.Replace("ę", "e");
                stringBuilder.Replace("ł", "l");
                stringBuilder.Replace("ń", "n");
                stringBuilder.Replace("ó", "o");
                stringBuilder.Replace("ś", "s");
                stringBuilder.Replace("ź", "z");
                stringBuilder.Replace("ż", "z");
                stringBuilder.Remove(0, 1);
                stringBuilder.Remove(stringBuilder.ToString().Length - 1, 1);
                var listElement = "["
                                  + stringBuilder
                                  + "](#"
                                  + stringBuilder
                                      .ToString()
                                      .ToLower()
                                      .Replace(" ", "_")
                                      .Trim()
                                  + ")  \r\n";
                _markdownTOC += listElement;
            }

            return _markdownTOC;
        }

        public static string GenerateMarkdownNoNestedTOC()
        {
            _markdownSub = GenerateMarkdownTOC() + GenerateMarkdownIdentifiers();
            return _markdownSub;
        }
    }
}