iTerm2 falls back to half-block printing inside tmux

[luukvbaal]

Despite the fact that iTerm's image escape sequences and indeed its imgcat script seems to work inside tmux, viu will fall back to half-block rendering.

TERM_PROGRAM is equal to tmux inside tmux but exporting TERM_PROGRAM=iTerm.app manually doesn't seem to help either; this results in nothing being printed at all.

Is this something that was/can be considered inside viuer?

Edit: quoting the imgcat script:

# tmux requires unrecognized OSC sequences to be wrapped with DCS tmux;
# <sequence> ST, and for all ESCs in <sequence> to be replaced with ESC ESC. It
# only accepts ESC backslash for ST. We use TERM instead of TMUX because TERM
# gets passed through ssh.
function print_osc() {
    if [[ $TERM == screen* ]]; then
        printf "\033Ptmux;\033\033]"
    else
        printf "\033]"
    fi
}

[luukvbaal]

Upon further inspection it seems iTerm's image protocol support inside tmux is spotty and doesn't always work. Is this why it wasn't included in viu? Anyhow, closing.

[atanunq]

Thanks for raising the issue & sorry for the delay! I never really wanted to get into the whole tmux + custom protocols mess. I'm afraid it gets too ugly too quickly for me to handle.

[luukvbaal]

Completely understand. Just from my initial testing with imgcat it seemed to work hence why I opened the issue. After integrating the required change into iterm.rs and previewing more images I noticed issues and came across the relevant threads describing said issues. I agree its probably not possible/worth it to handle this edge case indeed.