Terminal output messes up and wraps at 80 characters

[DasGandlaf]

Debug adapter definition and debug configuration

Using nvim-dap with nvim-dap-ui

Debug adapter version

No response

Steps to Reproduce

Start a program, open nvim-dap-ui terminal, and see that terminal output is wrapped:

Expected Result

Should not wrap the terminal output. When user enables wrapping, it should wrap on the window width.

Actual Result

Terminal output wraps.

The width 80 is specified in session.lua. This width is passed to the vim pty that's started. The vim pty is what causes the problem I think, since a fixed width has to be passed, and it wraps based on that.

This is a major issue for viewing console logs. When viewing longer stack traces it's very hard to read what's going on.

Now there is a another issue as well, but I am not sure if this happens due to the wrapping or not. Here an example of the terminal output:

1. I print =================================...
2. An error gets thrown afterwards

Even though I print before the error happens, the characters get wrongly mixed into the error:

1: panic: reached unreachable code=====================================
2: C:\Users\user\game.zig:155:
3:              unreachable;=======================================================
4: =============^

However, when I print the lines received from on_stdout in order, this is what I get:

1: ==============================================================================
2: panic: reached unreachable code
3: C:\Users\user\game.zig:155:
4:              unreachable;
5:              ^

The order and the messages are correct here, but once the pty vim window is reached, the output gets messed up.

Are there any solution to these problems?

Thanks for your awesome plugins and your help!

[mfussenegger]

80 is only used as fallback if there is no terminal_win provided. That's only the case with custom terminal_win_cmd implementations.

Looks like nvim-dap-ui sets one: https://github.com/rcarriga/nvim-dap-ui/blob/e94d98649dccb6a3884b66aabc2e07beb279e535/lua/dapui/elements/console.lua#L51

In addition to returning the buffer it would have to return the window number.

That said, using vim.o.columns might be a better fallback than 80

[DasGandlaf]

Thanks for your answer!

When I use vim.o.columns, this is what I get:

1: ====================================================================
2: ====
3: ====================================================================
4: ====
5: ==================================

It just wraps at random locations, instead of not wrapping at all.

As a side point, generally, the entire terminal output is super buggy too. When resizing the window, lines get duplicated, moved to the wrong spots, characters disappear, etc.

Not sure if this happens only on my PC, please do let me know!

Thank you!