Directory & prompt tracking work, except in tmux

[joostkremers]

I love this package as it's giving me a decent terminal inside Emacs. But I'm having trouble getting directory & prompt tracking to work inside tmux.

Without tmux, everything works. I can use find-file and it will prompt me for a file in the directory that's current in vterm. But once I activate tmux, this stops working: I'm prompted in the directory in which I originally started tmux, regardless of which directory I moved to in the meantime.

The same thing happens with prompt tracking: C-c C-n and C-c C-p work reliably without tmux, but they don't work properly once tmux is activated.

I source .bashrc-emacs-vterm.sh at the end of .profile, and inside tmux, the value of PS1 contains \[$(vterm_prompt_end)\], so the file gets sourced in tmux.

Do you have any idea where the problem might be, or where I might start looking to troubleshoot?

Emacs 28, latest vterm, libvterm 0.2, tmux 3.3.

[nyamada]

I'm seeing the same problem with zsh.

I've tried everything I can think of; and can validate that the vterm_prompt_end variable is getting initialized properly, but directory tracking just doesn't work inside tmux.

Would be happy to troubleshoot as well --

Emacs 28 and 29 , latest vterm, libvterm 0.2, tmux 3.3a --

[nyamada]

I don't know if this is a clue, but when I enter a tmux session, simple vterm_cmd commands don't work --

I have in my .zshrc this stanza:

find_file() {
    echo "RUNNING"
    vterm_cmd find-file "$(realpath "${@:-.}")"
}

It fires both in a plain vterm session and under tmux -- in both cases I see the "RUNNING", but under tmux the vterm_cmd doesn't happen and the file doesn't open... bizarre --

Actually, I've debugged further and I think the escape sequence in vterm_printf just isn't working for me --

my version of the function is:

    if [ -n "$TMUX" ] && ([ "${TERM%%-*}" = "tmux" ] || [ "${TERM%%-*}" = "screen" ] ); then
        # Tell tmux to pass the escape sequences through
        printf "\ePtmux;\e\e]%s\007\e\\" "$1"
    elif [ "${TERM%%-*}" = "screen" ]; then
        # GNU screen (screen, screen-256color, screen-256color-bce)
        printf "\eP\e]%s\007\e\\" "$1"
    else
        printf "\e]%s\e\\" "$1"
    fi
}

and my current TERM inside tmux is tmux-256color which is firiing the first escape sequence clause -- any ideas for to debug further?

[nyamada]

I've figured this out.

Tmux 3.3 added a new option allow-passthrough to turn on / off passing through escape sequences. Its default is off

joostkremers:

put this in your .tmux.conf --

set -g allow-passthrough on

and dir tracking will work again

So not an issue in emacs-vterm -- !

[joostkremers]

Thanks for figuring this out. Unfortunately, there must be something else in my config that's causing this issue, because I'm running tmux 3.0 and installing 3.3 doesn't change anything...

Edit: On my work computer, which has a different Linux distro (Arch) and which has tmux 3.3, it does work...

[divansantana]

Same here, doesn't seem to work with tmux, even with set -g allow-passthrough on. 🤔