Test script for reproducing a tmux passthrough bug

test-iterm.sh

#!/bin/bash

function print_osc() {
    if [[ -n $TMUX ]] ; then
        printf "\033Ptmux;\033\033]";
    else printf "\033]"; fi
}

function print_st() {
    if [[ -n $TMUX ]] ; then
        printf "\a\033\\"
    else printf "\a"; fi
}

function send_file() {
    # sends a dummy file containing $REPEAT '.' characters
    REPEAT=${1:-1024}
    filename=$(echo -ne "test-$REPEAT.txt" | base64)
    echo "Sending a text data of $REPEAT bytes ..."

    print_osc
    printf "1337;File=name=$filename;size=$REPEAT;inline=0:"
    head -c $REPEAT < /dev/zero | tr '\0' '.' | base64
    print_st
}

send_file $1