TI MCE patch source splitter

MceSourceSplit.cs

// See https://aka.ms/new-console-template for more information
using System.Text.RegularExpressions;

string inFile = @"your_patch_file.c";
string outDir = @"your_output_dir";

Regex patternRegex = new Regex(@";  (.+?):\s+(\d+) (.*)");

using StreamReader sr = File.OpenText(inFile);
Directory.CreateDirectory(outDir);
bool foundStart = false;
Dictionary<string, FileContext> sourceFiles = new();

while (!sr.EndOfStream)
{
    string line = sr.ReadLine();
    if (!foundStart)
    {
        if (line == "/* -------- ASSEMBLY CODE ----------------------------------------------")
        {
            foundStart = true;
        }
    }
    else
    {
        if (line == "*/") break;
        Match match = patternRegex.Match(line);
        if (!match.Success) throw new InvalidDataException("Can't match source line.");

        string fileName = match.Groups[1].Value;
        string lineNum = match.Groups[2].Value;
        string lineContent = match.Groups[3].Value;
        int lineNumInt = int.Parse(lineNum);

        if (!sourceFiles.TryGetValue(fileName, out var fileCtx))
        {
            fileCtx = new(0, File.CreateText(Path.Combine(outDir, fileName)));
            sourceFiles.Add(fileName, fileCtx);
        }

        if (lineNumInt - 1 != fileCtx.LineNum) throw new InvalidDataException($"{fileName}:{lineNumInt}: was expecting line {fileCtx.LineNum + 1}!");
        fileCtx.Writer.WriteLine(lineContent);
        fileCtx.LineNum = lineNumInt;
    }
}

foreach (var ctx in sourceFiles.Values)
{
    ctx.Writer.Flush();
    ctx.Writer.Close();
}

class FileContext
{
    public int LineNum { get; set; }
    public StreamWriter Writer { get; set; }

    public FileContext(int lineNum, StreamWriter writer)
    {
        LineNum = lineNum;
        Writer = writer;
    }
}