Getting red curly lines under words in tmux for spellcheck

[Sivaram Neelakantan]

I'm on WSL tmux 3.6a running on Windows Terminal.

This works outside of tmux in the bash shell and I can see red curly
lines
$ printf "\e[4:3m\e[58:2::255:0:0mRed Curly\e[0m\n"

from within tmux, the same gives only the text without the curly lines.

$ echo $TERM
tmux-256color

Is there a way to get tmux to use the same terminal codes from Windows
Terminal?

sivaram
--

[Tobias Damisch]

I looked into this, just for the fun of it. Under Linux, too, I get
curly underlines outside of tmux just fine, but not inside tmux.
With some googling, I found out that this is probably an issue with
ncurses, which tmux relies on. I compiled latest stable ncurses
and tried compiling latest tmux against it, configure succeeds, but make
doesn't.

Now, one could go back ncurses releases and see where tmux starts to
compile, and test if this fixes the issue, but that didn't seem fun to
me right now. It is, though, what I would try next.

Cheers,
Tobias

Am 02.01.26 um 05:01 schrieb Sivaram Neelakantan:

[Nicholas Marriott]

Try

set -as terminal-features '*:usstyle'

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[M Kelly]

Hi,

I don't know quite why, but with Windows Terminal and WSL2 I do not get curly underscore colours in tmux with terminal-features 'usstyle'.

I had to add a terminal-override for setulc and make it a little different -

# try to add curly underscore colors for WSL2 ...
%if '#{m/r:.,#{WSL_DISTRO_NAME}}'
    # set-option -sa terminal-features ',*:usstyle'
    set-option -sa terminal-overrides ',*:Smulx=\E[4::%p1%dm'
    set-option -sa terminal-overrides ',*:Setulc=\E[58::2::::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'
%endif

I don't know why it has to have the extra colons as compared to the traditional setulc that works for most other terminals.

I found this info searching sites such as https://github.com/leonasdev/.dotfiles/issues/15#issuecomment-1931906339

my TERM before starting tmux is set to xterm-256color and is tmux-256color once inside tmux.

thx,

-m

[Nicholas Marriott]

It must require the second argument which specifies the colour space, convention is to treat this as optional.

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