C#•2mo 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);
            }
        }

5 Replies

unhAPI•2mo ago

you could for example cut the source to Nmax chars and then cut to the last new line (or delimiter) but there are many ways to do it

Pobiega•2mo ago

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;
    }
}

certainly not the most beautiful... also seems to be an off by one or something here 🙂 there we go, added some trimming and now it makes sense :p

Penthus•2mo ago

Worked perfectly, thank you very much 🙂

Pobiega•2mo ago

it can probably be optimized a bit, but eh, it works 🙂 if you are happy, don't forget to $close

MODiX•2mo ago

If you have no further questions, please use /close to mark the forum thread as answered

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✅ Splitting string into chunks with delimiter