feat: scrollback buffer reflow ("soft wrap")

[neg-serg]

The scrollback buffer is hardwrapped due to Neovim limitations (see https://github.com/neovim/neovim/issues/2514).

Example:

https://github.com/user-attachments/assets/9db5edd9-7398-4509-b6dc-3ee3f152b42a

• [ ] Once a solution is available in Neovim, integrate it with kitty-scrollback.nvim
• [x] Set reasonable width (vim.o.columns) to reduce issues with hardwrapping (this will not prevent it but try and have a happy medium with hardwrapping issues and performance) https://github.com/mikesmithgh/kitty-scrollback.nvim/pull/267

---

Original Issue:

Steps to reproduce:

Generate extremely long newline, for example:

for t in {1..100}; do echo -ne eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeemmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm; done

There is only one long string here, but it's impossible to select with pager as the single line. In the same time with the mouse it remains be possible via kitty scroll-back. Is there any way to get around this problem?

This can often be seen in practice when parsing absurdly large log lines. After this, they are very inconvenient to copy using the keyboard, which adds manual work. The problem can be worked around using tmux, but it increase overall latency.

[mikesmithgh]

Reproduced:

#!/bin/bash

for ((i = 0; i < 90; i++)); do
	echo -n "123456789|"
done

echo

https://github.com/mikesmithgh/kitty-scrollback.nvim/assets/10135646/66982b2b-a8d7-4872-bbaa-1ecc549ce5d5

Setting vim.o.columns to 300 here https://github.com/mikesmithgh/kitty-scrollback.nvim/blob/main/lua/kitty-scrollback/launch.lua#L375

[mikesmithgh]

Hey @neg-serg thanks for the issue, so the problem is around the number of columns I have set for Neovim (currently 300). When kitty-scrollback.nvim reads the scrollback buffer into neovim's terminal it hard wraps at 300. When I increase vim.o.columns during processing it starts to reduce the performance. I'll have to think if there is a decent way to work around this.

When you say workaround with tmux, what exactly do you mean?

[neg-serg]

If you copy this string with tmux you get one string only, without additional newlines. Using tmux selection with clipboard integration get you the same result as with kitty-scrollback via mouse.

You have 10000 columns limit in modern vim/neovim, after that strings going to be wrapped. The problem here that you cannot distinguish newlines from wrapping and newlines from output via pager.

[mikesmithgh]

https://github.com/mikesmithgh/kitty-scrollback.nvim/issues/78#issuecomment-1831025287 hard wrapping at 300 stopped working at some point.

https://github.com/mikesmithgh/kitty-scrollback.nvim/pull/267 should restore the behavior of hard wrapping at 300 columns

https://github.com/user-attachments/assets/9db5edd9-7398-4509-b6dc-3ee3f152b42a

This is a happy medium between working around Neovim's limitation and avoiding a large column setting which impacts performance. Anecdotally > 300 reduced performance.