Query/set pane background color via OSC

[unphased]

I am not sure if the info in #1919 is indicating that it's possible to query or set terminal background color.

I'm doing something fancy with changing terminal backgrounds dynamically, it's very useful!

I realized that there is a standard escape sequence to assign bgcolor of terminal from application. So under tmux the natural thing to do would be to set the bgcolor for that pane.

We can already set the color for a given pane explicitly, so the capability is there. Is this supported?

I tried printf '\033]11;#ff0000\007' in the shell and it works in a plain terminal but not under tmux.

[nicm]

I use this every day so it definitely works.

[unphased]

Thank you for confirming. I can see that the issue #2101 indicates it is implemented but I am lacking the knowledge of how to tell tmux that it should interpret and accept background color.

[unphased]

My config contains:

# set using new term features feature of tmux 3.2+
set -sa terminal-features "*:hyperlinks:strikethrough:RGB:title:ccolour:cstyle:clipboard"

# To give tmux awareness of undercurl and underline color, refer to
# https://github.com/alacritty/alacritty/issues/1628
set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'
set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'

[unphased]

I hope we are not confusing "terminal default background color" with "text bgcolor"

the former is what i need, to specify the state for the entire terminal pane to be set to a given default bgcolor. I want that to persist in a pane. So far I have had to make calls to tmux to set it via tmux select-pane -t "$pane_id" -P "bg=$color"
the latter is similar to regular ANSI text colorization and has always worked

[unphased]

I am able to get some kind of expected result which proves that tmux correctly interprets OSC 11 into pane bg via:

tmux -L T_OSC kill-server 2>/dev/null; \            
tmux -L T_OSC -f /dev/null start-server \; \
  set -g default-shell /bin/sh \; \
  new-session -d -s osc \; \
  send-keys -t osc:0.0 $'printf "\\033]11;#104E8B\\007"; sleep 0.3' Enter \; \
  run-shell 'sleep 0.4' \; \
  display -pt osc:0.0 '#{pane_bg}'
#104e8b

Subsequently i'm able to attach this tmux and keep using that OSC 11 and it works but once i run my zsh the capability stops.

This is an important starting point and narrows it down to some config that I have. Thanks.

[unphased]

I was able to fix it by commenting out some pyenv stuff from my zshrc!

export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init --path)"
eval "$(pyenv init -)"

What else is interesting: if only one of these evals is left in there it does not get broken.

[mattcheau]

Definitely works. Try running cat -v under tmux, paste the command, and then press 'Enter' to try to confirm escape sequencing/input. Could also compare to console/shell.

[mattcheau]

To confirm that escape sequencing is your root issue (which it appears to be), run cat -v by itself—then paste '\033]11;#ff0000\007'. My guess is that the paste will still be interpreted (and therefore output under cat) as ^[]11;#ff0000^G.

On my own instance, printf '\033]11;#ff0000\007' colors red the entire pane background (not text background) that the command is run within.

[mattcheau]

cat -v is simply being used as a diagnostic utility here.

[unphased]

since any of these prints and echos are able to properly cause the terminal to change its bgcolor outside of tmux it means that the shell escape handling is working properly. anyway i figured it out and now have a tmux config that properly sets the pane colors so i am all set on this.

[mattcheau]

"since any of these prints and echos are able to properly cause the terminal to change its bgcolor outside of tmux it means that the shell escape handling is working properly"

This is a mistaken assumption. You should post your solution for posterity.

You're welcome.

[unphased]

I did post it. in this same discussion up above. Can you review it and tell me what information you would like to see? i'm pretty sure I documented everything about what I explored here for people to follow what happened.