C#•2y ago

✅ Splitting string into chunks with delimiter

I am trying to split a string to fit within a character limit for my message. This works but cuts words, I was wondering if there is a way to have the chunk split in a way splits the chunk before a word on the new line.

Example data is

John
Ben
Amy
Susan
Bob
Sarah

John
Ben
Amy
Susan
Bob
Sarah

Current result

John
Ben
Amy
Susan

B
ob
Sarah

John
Ben
Amy
Susan

B
ob
Sarah

Desired Result

John
Ben
Amy
Susan

Bob
Sarah

John
Ben
Amy
Susan

Bob
Sarah

Current Code

        foreach (var member in members)
        {
            description += $"{member}\n";
        }

        if (description.Length < 4096)
        {
            var message = description;

            PostMessage(message);
        }
        else if (description.Length > 4096)
        {
            var result = description.Chunk(4096).Select(x => new string(x)).ToList();
            foreach (var content in result)
            {
                PostMessage(message);
            }
        }

        foreach (var member in members)
        {
            description += $"{member}\n";
        }

        if (description.Length < 4096)
        {
            var message = description;

            PostMessage(message);
        }
        else if (description.Length > 4096)
        {
            var result = description.Chunk(4096).Select(x => new string(x)).ToList();
            foreach (var content in result)
            {
                PostMessage(message);
            }
        }

var data = """
           John
           Ben
           Amy
           Susan
           Bob
           Sarah
           """;

var result = ChunkWithLength(data, 9, "\n");

var output = string.Join("\n\n", result.Select(x => string.Join("\n", x)));
Console.WriteLine(output);

IEnumerable<IEnumerable<string>> ChunkWithLength(string data, int length, string delimiter)
{
    var lines = data.Split(delimiter, StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
    var chunk = new List<string>();
    var chunkSize = 0;
    foreach (var line in lines)
    {
        var newSize = chunkSize + line.Length;

        if (newSize > length)
        {
            yield return chunk;
            chunk = [line];
            chunkSize = line.Length;
        }
        else
        {
            chunk.Add(line);
            chunkSize = newSize;
        }
    }

    if (chunk.Count > 0)
    {
        yield return chunk;
    }
}

var data = """
           John
           Ben
           Amy
           Susan
           Bob
           Sarah
           """;

var result = ChunkWithLength(data, 9, "\n");

var output = string.Join("\n\n", result.Select(x => string.Join("\n", x)));
Console.WriteLine(output);

IEnumerable<IEnumerable<string>> ChunkWithLength(string data, int length, string delimiter)
{
    var lines = data.Split(delimiter, StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
    var chunk = new List<string>();
    var chunkSize = 0;
    foreach (var line in lines)
    {
        var newSize = chunkSize + line.Length;

        if (newSize > length)
        {
            yield return chunk;
            chunk = [line];
            chunkSize = line.Length;
        }
        else
        {
            chunk.Add(line);
            chunkSize = newSize;
        }
    }

    if (chunk.Count > 0)
    {
        yield return chunk;
    }
}